Posts

Part 5 for stage 4

Fortunately, as with so many things in life, everyone has their preferences...
More RPM and more peak power or more torque at low RPM.

That's why in today's part I'm looking for more... But not top performance, but for speed range and torque. The "tractor engine" is sought.

In part 4 with stage 3, I looked in the direction of the higher control angle by raising the cylinder and making a small adjustment to the exhaust. If I were now to increase the exhaust further in order to perhaps achieve higher peak performance and speed, the way would be backwards; to try the cylinder with more blowdown at lower control angles installed.

So today I lower the cylinder. Overall, this results in lower control angles, but the pre-release increases slightly. The smaller transfer angle should allow the cylinder to produce a little more torque at low rpm.

The spacer on the cylinder head was changed from 1mm to 3mm compared to the third construction stage. At the cylinder base, the 2mm spacer leaves the field and the cylinder is only supported by a normal 0.3mm thick gasket. The squeezing edge remains at 1.3mm, as with the other construction stages.

In the following graphs are the current curves of construction stage 4 RED to see. The curves from the previous stage three appear in BLUE.

Elron is the first to show what he thinks of the change.

As can be expected, the absolute top performance drops slightly, but the maximum performance and torque shift in the direction of lower speeds. The torque increases slightly and feeds the range between 5100 and 7000 rpm.

The Polini box, which is more intended for engines with less transfer time, is placed next on the exhaust port.

At first glance, the curves may seem sobering. On closer inspection, the Polini Box turns out to be a real torque animal. At the end of this series of tests, it will rank second in terms of torque with 37.4Nm. The graph already passes the 4700 hp mark at 20 rpm. The maximum power shifts by an impressive 1000 rpm in the direction of a lower speed, culminating at 6400 rpm. The maximum torque pulls at the rear wheel at 6000 rpm. An engine constructed in this way is just begging for a long gearbox.

This allows the M244 to move over the asphalt with extreme shift laziness. Jack off the stand, shift into gear 4 and just pull the cable. Don't worry, it will be quick...

 

The aged all-rounder in the field.

The JL left arm puts its torque in the range between 5000 and 7000 rpm and thus offers more drivability. Although the peak power falls by one hp, the JL can still offer very good drivability in the field of resonance exhaust systems.

New Line

The handwork from the north is also responding to the adjustments as expected. Already at 5000rpm, 20 horses are ready to move significantly. Full torque is available at 6100 rpm. Although it pushes the absolute top performance down a bit and the Newline gives up 2 horses in favor of the early torque, it is happy to take the larger pre-release in order to go over 10.000 rpm and maintain it there with over 20 hp.
The Newline behaves here almost like a box exhaust system, seasoned with a significant torque kick.

Posch Nessi

The sea monster ducks its head slightly due to the reduced steering angles. But that's not bad at all. As with the Newline, the rev range shifts slightly towards early revs and develops more torque in the process. At 5200 rpm the curve already exceeds the 20 hp mark. The slightly increased pre-let helps the Nessi to a wider speed range.

Posch Racing Resi

The lush Resi handles the steering angle that is unsuitable for you amazingly well. Although it also loses peak performance, it gives an idea of ​​the bandwidth that can be possible with the appropriate control angles and more forward airflow. With a speed range of almost 4100 rpm, it is in the top league here.

Lakers

The Lakers, made for a lot more alert, don't like the slack head angles that much. The exhaust craves for larger time cross sections. The speed range shifts to lower speeds as expected, but the low time cross sections are not the right playing field for the Lakers. But his chance will come with the following expansion stages...

 

Here again all maximum values ​​in the overview

In the fourth part of our little blog series we make the following changes to our test engine:

The cylinder is attached at the foot with two 1mm Spacers increased by a further 2mm compared to level 0.5. This changes the steering angle of the transfer channels from 124° to 126°. The outlet is adjusted to a control angle of 190° by milling. To do this, the outlet in the cylinder was raised by 1.8mm. The outlet width remains unchanged at 57%.

 

The first attempts are made with the Elron

 

A little more nervous exhaust systems would show a clear shift in the direction of performance with the changes made, but the Elron is almost unimpressed by the specifications of the cylinder and retains control over the characteristics of the engine. A slight increase in the maximum values ​​after the decimal point only indicates that the Elron has noticed that the cylinder is sending a clearer signal through the exhaust. However, the maximum torque remains at the same level as in the first construction stage.
The available speed range is reduced by 500 rpm to 3540 rpm.

 

Polini box

 

As a box exhaust, the Polini exhaust system reacts more as expected. Similar to the Elron, the can from Italy only shows small reactions. The lower effective compression makes the curve dip a bit in the rise between 4000 rpm and 6200 rpm. The system converts the slightly increased time cross-section at the outlet window with a gain of just over one horsepower at peak.
The maximum torque remains the same at 35.2Nm and is only shifted by a few hundred revolutions in the direction of higher speeds.
With a bandwidth of 3800 revolutions, the Polini system is slightly behind stage 2, but this test shows that the box does not necessarily prefer the very small steering angle. In a direct comparison to stage 1, the bandwidth and maximum values ​​have increased significantly.

 

 

 

JL left hand / JL performance

 

Our test subject had a short break in the previous construction stage due to appointments away from home; but now plays again in the third construction stage. So here is the comparison between levels 1 and 2.
This also shows how clearly an exhaust can behave when it is operated from other steering angles. The JL, which is considered good-natured, turns out to be a very approachable partner in the search for performance.
At the top, the JL provides almost five and a half more horses and climbs over the 36PS line in the graph. The torque remains at 32.6Nm at the same level as in the first attempt. However, the torque extends over a much wider range - beyond 7000rpm. The performance peak is reached with 36.4PS at 8400rpm. The JL falls below the 25 HP line considered in the bandwidth only beyond 9600 rpm and can therefore not be described as a lazy speed. In general, the graph shifts significantly in the direction of higher speeds. With a bandwidth of only 3400 revolutions, the JL even lags behind the Elron and brings up the rear in terms of bandwidth in this construction stage.

 

Scooter and Service Newline

 

The edgy powerhouse from the north feels really comfortable in this expansion stage and takes two best values ​​with it.
There are no notable changes in the rise in the newline, but it does quite a bit due to the larger advance angle in the engine speed range. With 37.3Nm, it takes the top position in terms of torque in the third construction stage. The available speed range is narrower compared to the previous tests, but here too the Newline achieves a range of 4000 revolutions. With these values, considerations germinate after a longer primary with 24-60 ...

 

Nessie

 

Like the Elron, the sea monster from Posch Performance is not quite sure what to do with the changed control angles. Maximum torque remains the same and peak power increases by one horsepower. While the Nessie was still way ahead in level 1 with 4300 rpm in terms of bandwidth, the available speed range in level three is a bit on the dip station and is in the upper midfield with 3700 rpm.

 

 

 

Racing Resi

 

The Racing Resi taste the changes better. Rather devoted to the higher control angles, the Resi develops one more horsepower at the top and adds torque, which hardly affects the bandwidth on the 25hp line. In absolute terms, the Resi holds the position of the highest peak power with 38.9 hp in this level. We are slowly approaching the 40hp mark with the expansion stages.

 

 

Lakers

 

 

With 126° to 190°, the Lakers are not yet playing in their comfort zone. Although it also clearly converts the changed control angles into performance. With 38.4 hp at the top, it is only just behind the Resi. With a speed range of 3700 rpm, which already extends to 10.100 rpm, the Lakers shows where the journey can go with suitable peripherals.

Here is an overview of the results. Best values ​​are highlighted in green.

Cylinder hood Vespa Quattrini M244 GRP

Cylinder hood too short? We have the matching Quattrini cylinder cooling hood made of GRP

In the course of our motor project with the Quattrini M244, we have worked with GRP specialist BSK Cylinder cooling hood for the M232 and M244 cylinders created.

Cylinder hood Vespa Quattrini M244 GRP

Quattrini cylinder too long for original cylinder cooling hood

The basic structure of the M244 cylinder is long. The Piaggio cylinder hood of the Vespa PX200 is simply too short. That and the efficient, central positioning of the spark plug make it difficult to use the original cylinder cooling hood.

With a Piaggio cylinder cooling hood, the original clearance for the spark plug can be used with our matching stopper be closed.

Plug for spark plug hole in cylinder hood Vespa

But the overall length is still missing so that the cylinder cooling hood can be screwed to the engine housing and the fan wheel cover.

Cylinder hood too short for Quattrini cylinders

The solution: perfectly fitting GRP cylinder hood from BSK

The cylinder cooling hood from BSK has been adapted accordingly.

The total length to the fastening points is optimized and the hole for the spark plug is in the right place.

Fits perfectly - GRP cylinder cover for Vespa Quattrini M244 from BSK

At the point where the cylinder cooling hood is screwed to the spacer nut, the cylinder cooling hood is reinforced with a sturdy washer.

Reinforced BSK GRP cylinder cover for Vespa Quattrini M244

A rigid reinforcement on the screw to the spacer nut ensures that the cylinder cooling hood can be securely and permanently fixed to the cylinder head without the GRP fabric being damaged by the screw.

The fan duct is designed so that a Modern intake manifold and a larger carburetor can easily be accommodated. Here on ours too M244 test engine with a 30mm Polini carburetor.

 

Quattrini M244 Kingwelle - the super tourer

Quattrini M244 king shaft - the super tourer in the first expansion stage "Plug & Play" M244_1

This is part 2 of this Quattrini M244 - Series. In this first construction stage, M244_1, we have the M244 without any further changes, only with spacers on the cylinder head and the cylinder base our engine eingerichtet.

We have entered the resulting control angles in the list for the test plan.

In terms of design, this setup is in the middle of the range of expansion stages.

 

We have the control angle in the list for the test plan

TEST POLINI BOX

First we send the all-purpose weapon from Polini into the race.

Polini box exhaust Vespa

Performance diagram Polini exhaust on Quattrin M244i

Test bench diagram POLINI BOX exhaust on Quattrini as PDF: M244_1_POLINI

The result is quite clear. Already at 4000rpm there are 15 HP and 26Nm on the rear wheel.

The maximum values ​​are 30.5PS at 6500rpm and 34.4Nm at 5900rpm.
Even at 9500rpm there are still 22PS on the rear wheel. This constellation already calls for a longer primary translation.

 

TEST FALKR ELRON

The next test subject comes from FalkR and listen to the name Elron's.

Performance diagram FALRR ELRONi exhaust on Quattrin M244i

Test bench diagram FALKR ELRON exhaust on Quattrini as PDF: M244_1_ELRON

With regard to the maximum values, the Elron ranks as real resonance exhaust already above the Polini Box. But the tide is turning only beyond the 6500rpm in favor of the Elron. In the range before 6500 rpm, the Polini Box has the lead here. After passing the 6500rpm mark, the Elron gains significantly and is above the Polini Box up to the end of revs beyond the 10500rpm.

 

TEST JL PERFORMANCE

Another old friend is that JL performance.

JL performance

Performance diagram JL PERFORMANCE exhaust on Quattrin M244i

Test bench diagram JL-PERFORMANCE exhaust on Quattrini as PDF: M244_1_JL_LH

The somewhat outdated concept of the JL still delivers reliable values ​​today. The JL does not cope with the first stage of the engine quite as well as the Elron. With 31PS at 8200rpm, that's something like suffering at a high level. The rather gentle entry and a good performance of 16PS at 4000rpm make the JL a very drivable exhaust with a good start in Reso optics.

 

 

TEST NEWLINE SCOOTER & SERVICE

The Newline exhaust from Scooter & Service is with us in Scooter Center Shop .

SCOOTER & SERVICE NEW LINE

Performance diagram SCOOTER & SERVICE NEWLINE exhaust on Quattrin M244i

Test bench diagram NEWLINE exhaust on Quattrini as PDF: M244_1_NEW_LINE

The new line from Scooters and Service from Hamburg already delivers its maximum power of 6300PS at 32rpm. Even if the playing field doesn't quite fit the Newline, which would like to see a little more steering angle, the manual work from Hamburg delivers a remarkable 6000Nm already at 36rpm. The torque beast in this expansion stage

 

TEST POSCH PERFORMANCE NESSIE

As the first representative of the "Performance" department, we let Nessie from Posch Performance work on the M244.

Test bench diagram NESSIE - POSCH exhaust on Quattrini as PDF:

Test bench diagram NESSIE - POSCH exhaust on Quattrini as PDF: M244_1_POSCH_NESSIE

Until just before 6500rpm, the world is pretty fine for the Nessie. Then the curve takes a course that suggests that the Nessie would like to see significantly more outlet angles.

Nevertheless, the Nessie with 34.8Nm at approx. 6000 rpm can be counted among the clearly high-torque systems.

 

 

TEST POSCH PERFORMANCE RACING RESI

Of course we also tested the Racing Resi from Posch Performance.

Test bench diagram RACING RESI- POSCH exhaust on Quattrini as PDF: M244_1_POSCH_RAC_RESI

The Racing Resi from the same manufacturer runs very similar to the Nessie and also requires more ventilation over longer control angles. With almost 35Nm at 6100rpm, the Resi is also well ahead in the league of absolute torque animals.

 

TEST LAKERS KINGWAVE

The Lakers as a thoroughbred racing exhaust, stands well in the feed despite the high performance and engine speeds to be expected with the low control angles.

Test bench diagram KINGWELLE LAKERS exhaust on Quattrini as PDF: M244_1_LAKERS

With almost 36PS at 7700rpm, it is the front runner in terms of performance in this expansion stage.
In the later expansion stages, when higher control angles and a wider outlet come into play, this exhaust can probably live out much better.

 

Overview test run 1 Quattrini M244 exhaust systems

Quattrini cylinder M244 in the first construction stage, M244_1 "Plug & Play" without further changes only with spacers on the cylinder head and on the cylinder base on the Malossi engine and Kingshaft crankshaft adapted.

Exhaust comparison overview Quattrini M244

 

Be curious to see how the second expansion stage will continue ...

Alex builds a Quattrini engine

Vespa Quattrini M244 engine 252ccm - from super tourers to top racers

The story of the Quattrini cylinder

Towards the end of 2015, rumors grew that Max Quatrini launches a potent cylinder for the PX200.

The time has come at the beginning of 2016. The M232 and the big brother M244 are available on the market.

A construction that took some getting used to seemed to follow the concept, a cylinder with a maximum bore of 72mm in the M244 and without a supporting cylinder base.

Due to the design of the crankshaft by Quattrini, with a connecting rod of 126mm, which is rather long for the Vespa engines, the piston does not work so deep in the engine housing and therefore does not need a long, classic cylinder base.

Today, in 2021, the cylinder is enjoying increasing popularity due to its very high torque values ​​and the smooth-running design thanks to the long connecting rod of the Quattrini crankshaft.

Reason enough for us to build an engine with it and play through many possible scenarios for you and see what comes out of it. We have tested exhaust systems and carburettors for you in various stages of expansion.

In the delivery note attached here for our technology department, you will find all the components that we have used for this engine and that, in our opinion, function permanently with this concept.

200 test runs on our test bench

In total, we have over 200 test runs with the Quattrini M244 Completed on our P4 test bench with various engine expansion stages. We have more than 50km measured runs documented and almost 20 liters of fuel burned.
We would like to share the experiences gained from this test with you in this blog series.

 

Quattrini Vespa Motor - All Parts

 

To select the parts:

The expected high torques of the M244 speak in any case for a reinforced motor housing.

The experience from many kilometers on the road with our own scooters has taught us that engines in the range from 22 to 25 HP can be implemented as "durable" in conjunction with a Piaggio engine housing.

Our M244 Quattrini cylinder but should be expanded a bit in the course of the test. This is why the choice here is a motor housing from Malossi with membrane inlet.

A pair of Displacement of over 220ccm at erhigher engine speed, can no longer be supplied with sufficient fresh gas via a classic rotary valve on the narrow Vespa crankshaft. That's why we choose this Malossi motor housing with membrane control .

To make the fuel mixture we have one Polini 30mm carburetor used. In this experiment he stands for one Carburettor with 30mm bore. In the course of the tests, we also tried a PHBH30 in a counter-test. We will present the result of this in the following part of this blog series.

On the topic crankshaft we trust king wave. Here we find exactly what we are looking for to build a high-torque, smooth-running and durable engine.

The choice falls on one king wave with 62mm stroke and 128mm connecting rod. Due to the 2mm longer connecting rod and increased stroke, we have the opportunity to work with the control angles by moving the cylinder using spacers on the cylinder head and the cylinder base in the stroke direction. The longer connecting rod in connection with the weighty crankshaft also brings a significant plus in smoothness.

The stroke of 62mm results Cubic capacity 252,4ccm - already very promising to build a torque-oriented engine.

The ignition should keep our tourer running smoothly, so we chose the one here bgm ignition with the PX pole wheel with a mass of 2300g.

The performance of the 252ccm unit is controlled by a bgm superstrong Clutch, the bgm primary 25-62 and one bgm Transmission with the graduation 12-13-17-20 passed on to the rear wheel. The short, fourth gear on the auxiliary shaft keeps the most frequently used gear more stable. With one tooth less in fourth gear, the teeth become significantly wider in the tooth base and thus offer a significantly higher load capacity than the variant with a gear wheel with one more tooth.

 

Concept and test plan

The requirement for the test setup is that we work from a rather good-natured touring design to a sporty design. Just to be able to depict a section through the possible variants. As a starting point for the test series, we set a basis with small control angles in order to be able to test as many sensible variants as possible later

To determine a starting point, the crankshaft is mounted with bearing dummies and the cylinder is attached to determine the control angle.

Based on this initial data, we can consider to what extent we can sensibly set up the cylinder with spacers and work on the outlet in later stages of expansion.

After measuring back and forth a bit, we decide to start from the middle position of the control angle with one Transfer angle of 124 ° and a Outlet angle of 177 °.

 

 

 

Assembling the engine

Dream team: Malossi | bgm PRO | Kingwelle | Quattrini

The factory new Malossi motor housing will be finished by king wave for the crankshaft with 62mm stroke and the enlarged diameter of the crank webs with 99,4mm. The bearing seat for the bearing on the alternator side is also checked and reworked in individual cases, as the bearing seat is manufactured by Malossi with a very tight tolerance.

We also offer the completely machined housing with a high-quality crankshaft from Kingwelle as a set. We use the set for this engine KWM46228.

The one attached by Malossi Bearing Kingwelle does not recommend 6205 for the alternator side. We follow Kingwelle's recommendation and use a here NU205.

Before inserting the bearings, we process the motor housing and adapt the cylinder and the overcurrent ducts to each other. On a Piaggio engine case, this tends to degenerate into an evening event. The Malossi housing is already designed for the channels of the Malossi Sport and MHR cylinders and requires little rework for the Quattrini M244. Most of the work goes into removing the sealing surface on the cylinder base, which allows the M244 to be used on Piaggio engine housings.

Adjusting the transfer channels to the motor housing is done quite easily. The cylinder base seal shows how little needs to be adjusted here.

All bearings are traditionally used by shrinking in order to avoid damage to the bearing seats by simply pulling in the bearings. The shrinking or cold / warm process offers the advantage that no mechanical stress acts on the surface of the bearing seats and the seat is not widened as a result.

 

Wandering Malossi engine cases

Another peculiarity of the Malossi motor housing is that the supplied original silent rubbers are too narrow for the motor housing. Or rather, here Malossi has simply oriented the seats for the silent rubbers deeper in the housing than was originally the case. This allows the motor housing to move over the silent rubbers in the direction of the frame.

We have been here with one quite a while ago Spacer set BGM7952SP A remedy was created for the silent rubbers and thus ensured a secure fit of the silent rubbers in the correct position.

The gear

The M244 with a 62mm stroke of the king shaft brought to 252ccm, will transfer a lot of torque to the rear wheel. A guarantee to achieve a high cruising speed at a reduced speed. That enables the primary. Starting from a massive and early onset of torque mountain, the primary can be selected to be long or even very long. With 25 to 62 teeth, we use the longest primary offered by bgm. The reinforced primary repair kit from bgm creates a durable primary drive.

Shift pins and crossbar are included threadlocking assembled.

The bgm secondary gear is set with the smallest possible clearance with the bgm shoulder rings.

Assemble the Malossi motor housing

Further adjustments to the motor housing are no longer necessary and all other innards find their way into their place.

To assemble the crankshaft, the shaft sealing ring is moistened with a little oil so that the sealing lips slide cleanly onto the crankshaft and are not damaged.

The Malossi engine case, contrary to the Piaggio engine case, is without a solid seal composed. Instead of the paper seal, as in a modern engine concept, the housing is Surface seal sealed.

To connect the housing halves, Malossi uses M8 hexagon socket screws. Due to the different lengths of the screws used, a look at the Application listto find the correct attachment point.

 

 

bgm PRO Superstrong clutch & King shaft

The King Shaft is supplied with its own thrust washer and special key. The thrust washer has a clear radius that fits exactly to the radius of the crankshaft. A breaking thrust washer is almost impossible.

 

 

The Kingwelle has a special feather key on the drive side, which is specially manufactured for Kingwelle and fits exactly into the groove of the coupling hub.

We use one as a coupling bgm Superstrong CR a. With the standard equipment, 10 bgm springs XL, the CR clutch manages a reliable transmission of power up to 40hp. The king shaft coupling nut has a fine thread of the dimension M12x1. The nut comes with screw lock and a Tightening torque of 70Nm attached.

 

Assembly of further components

The engine is then completed with the rest of the components.
Intake manifold with the Malossi 2-valve membrane. Clutch cover, switch latch, cover for the starter motor and the bgm ignition system with static ignition timing.

Stress-free assembly of the ignition base plate on Malossi engine housings

The Malossi motor housing is reinforced in many places. This can lead to contact between the base plate and the bearing seat when the ignition is installed. The base plate of the ignition must sit tension-free in the centering, so in individual cases the base plate and / or the motor housing must be slightly reworked to ensure a tension-free fit of the base plate.

 

Check crush dimension

Before the final assembly of the cylinder, we check the pinch size using solder.
Due to the increased stroke, we aim for the squeeze dimension in the range from 1.3mm to 1.4mm and set this using the enclosed cylinder base seals.

By compensating for the larger stroke, there is no need for centering on the cylinder head. For this reason, holes for fitting sleeves are made in the cylinder head and cylinder. The adapter sleeves prevent the spacers used for the cylinder head in the course of the test from protruding into the combustion chamber and causing unwanted damage there.

 

The new Quattrini engine on the test bench

For the test runs, we set the ignition to 19 ° BTDC.

The runs of the first expansion stage We will introduce M244_1 to you in the next blog post before…

Just a quick note - none of the runs were below the 30PS Mark on the unprocessed M244