Imola Tuning Kit!

[jollm]

Hallo!

Bin mehr od. weniger durch Zufall auf diesen Kit aufmerksam geworden. Scheinbar ist das eine Kopie von nem 200er TS1. Der Einlass und der Aulass is ein wenig kleiner

als der TS1. Preislich isses ned billig,... Die ewige Frage -

Macht der "Häfn" (Abgeleitet von Nachthäferl ;) vulgo zylinder) einen Sinn?

Danke Jollm

[lummy]

ich hab bis jetzt nur den 185er imola gesehen, die bearbeitungsqualität hat mich nicht beeindruckt. da würde ich lieber in einen grossen block und ts1 inverstieren. den 215er ("monza") würd ich auch nicht kaufen, es liegen einfach keine erfahrungswerte vor wie beim ts1 und billiger ist er ja auch nicht ....

[jollm]

@lummy

da gibt es einen kit für den 200er motor. hab eh schon was gefunden und glaube nicht, daß sich das auszahlen wird,...

scheinbar hab ich keiner andere wahl es einen TS1 zu verpflanzen, ich wollt mi nur vorher noch umschauen wie die alternativen sind. oigen, das ding wird wieder ein großer münzspender ohne boden werden,... zum glück hab ich keine harley, da blutest dann wirklich, wennst ans eingemachte gehst ;)!

[athanasius]

Ich hab einen im Keller liegen, aber Erfahrungen hab ich damit noch keine gemacht. Aber im Sommer wird´s soweit sein. Zur Verarbeitung kann ich nur sagen, dass ich  noch nie einen TS1 zum Vergleich in der Hand hate, aber so schlecht find ich sie nicht. Im Vergleich dazu ist der "SR 190 cylinder kit with Stage 4 Road tune" nur als Rohling zu gebrauchen und für mich als Lambretta-Einsteiger eher nicht das optimalste.

[Whity Whiteman]

@ athanasius :

Na dann viel Spaß !  Du wirst dann einer der ersten Pioniere sein, die uns über Vergasereinstellung, Übersetzung und Leistungscharakteristicken berichten dürfen.

[Rainer]

Der Börni aus pfarrkirchen fährt auch den imola kit. Geht eigentlich ganz gut was ich bis jetzt so gesehn habe, aber kein vergleich zum TS1. Ich guck mal ob ich ein bild von der mühle finde.

Gruß Rainer

[Rainer]

hab leider doch keins.

Gruß Rainer

[athanasius]

Bin auch schon gespannt, die von Camebridge Lambretta habne mir zwar eine Vergaser-Grundbestückung geschickt, aber naja. Und auf 23° soll ich die Zündung stellen obwohl ich da schon ganz andere Werte gelesen hab.

[Angeldust]

Datt sacht Mark Bradwurst zum Thema:

Tuning options for 125/150/175cc engines using the Imola kit

The Imola cylinder is basically, to look at, a direct copy of the TS1 200 cylinder but uses a smaller piston of 64mm with some other small changes.

It uses the same style of port designs as the TS1 i.e.; reed valved inlet port, 4 transfer ports instead of two a round exhaust port and new exhaust flange.

TRANSFERS

The transfer feeds have been reduced in size so they fit and seal on the 150-style engine casing (Apparently the first cylinders used TS1 200 transfer feeds and were too big for 150 casings so they had to be reduced in size!).

Inside the cylinder the transfer ports resemble the TS1.

The Imola uses larger transfer ports compared to 125, 150, 175 cast cylinders.

They are reduced in size by a bridge to support the rings but still has a larger transfer area.

The ports are all at a different level some higher than the others giving staggered port timings from one side of the cylinder to the other.

At bottom dead center the lower edge of the transfer ports are 2mm higher than the piston!

This now means the transfer timings are too big!

Basically it's the main design fault of the cylinder, they are approximately 136 degrees, at least 10 degrees too large!

This has the effect of flooding the engine and kills the power output.

136 degrees suits a racing engine capable of revving to around 14,000 rpm, then in contrast it has a relatively small exhaust port of 175 degrees more suited to touring engines revving to around 8,000 rpm.

This combination of ports seems to work when set up in conjunction with a 28mm carb and a restrictive Clubman exhaust.

I would say that the exhaust is the controlling factor allowing the engine to work with in reason.

Fit an expansion and you will find that the scooter then doesn?t work!

I have in the past done a hand full of cylinders in this way and none of them ever worked correctly.

Customers have informed us that the Imola cylinders do 70 mph set up correctly and that seems their limit this is due to the transfer port timings, any more and you have been very lucky!

Smaller transfer timings would allow more revs and power.

Another way to help the cylinder but in this instance wouldn?t work is to increase the exhaust port to near on 200 degrees as used by high revving motor bikes.

But as Lambrettas have big heavy bodywork and only 4 gears this does not work (unless it was a track bike).

INLET PORT

The inlet port of the Imola looks similar to the TS1 but is now much smaller, it uses a smaller reed valve than a TS1 and both reed blocks cannot be swapped without major modifications.

Above the inlet port is the boost port similar to a TS1.

The inlet port has more of a rounded shape compared to the TS1?s square shape.

EXHAUST PORT

The exhaust as mentioned has a smaller exhaust port height giving 175 degrees compared to the TS1?s 185 degrees, also the diameter of it's outlet is slightly smaller!

These smaller port timings are ideal for a 190cc engine used for touring and suits a Lambrettas weight and size.

To go much over this would loose the bottom end power that the Imola seems to have.

REED BLOCK

The Imola uses a different reed valve which is smaller than the TS1.

This valve has similar petal sizes to our Yamaha item but the screw holes are different and makes using after market reed petals difficult.

This means the only reeds available are the standard ones, which are carbon fibre.

The reed block uses small reed stops compared to other TS1 styled reed blocks.

This if you push the valves open fully go further than the piston but in practice this never happens to a running engine showing that the reeds never open that far!

The inlet feed of the reed valve is much smaller if using the MBD inlet manifold the fingers would need trimming to fit in.

If using the TS1 inlet manifold this modification isn?t required and fits straight on to the Imola cylinder.

INLET MANIFOLD

The Imola inlet manifold is now a hybrid copy of a TS1 and an MB Developments manifold.

Externally the manifold looks like a standard TS1 type but has been modified to use a smaller carb, the manufacturer recommends a 28 or 30mm PHBH carb.

But this opens up the possibilities to use a carb as small as 20mm using a stepped down rubber mount.

By swapping the Imola manifold with a TS1 item you could use carbs up to 39mm if needed.

The Imola?s reed block doesn?t seal with a flange as with the TS1 cylinder, the flange has been cut down so it seats into a recess with in the cylinder.

This means the standard inlet manifold is 3mm further away from the frame making life a little easier.

Because the flange is now smaller the inside area has been reduced to suit the smaller carbs, in doing this two alloy fingers now go inside the reed valve as a copy of our own inlet manifold.

The MBD inlet only uses one finger but the larger size of carb manifold could not allow for us to use two.

This idea is very good and should promote low down pulling power!

It is possible to fit either the TS1 or MBD Yamaha reed block into the Imola cylinder, but a lot of grinding is needed for this to happen.

The advantage would be to use the better quality Yamaha item with Boyesen reeds.

PISTON

The early pistons were made by GOL and were not strengthened and used to brake!

The later piston with IMOLA and MP1625 cast into them has been strengthened around the round holes on the inlet side.

Unfortunately the pistons have been made with the age-old design of sharp corners below the gudgeon pin, this is the weak point of the piston and failures occur when the skirt falls off!

The piston rings are 1mm thick and are very high up towards the piston crown, these rings are the same as rings used by Wiseco!

The piston is designed to use piston shims to guide the con rod on standard crankshafts or if using a race crank you would need to use a Yamaha DT175 small end bearing.

MB Developments consider the piston to be the weak point, we believe that it will fail and customers have already told us this.

The SRP piston was designed to fit into the Imola and TS1 styled cylinders as well as all cast cylinders.

The only modification would be to cut a hole in the inlet side to give 360 degrees inlet timing.

The SRP piston is the first real designed race piston for Lambrettas but will work in standard or race cylinders making an ideal replacement for the Imola piston.

CYLINDER HEAD

The Imola kit doesn?t come with its own cylinder head your head needs machining to suit.

Beware we have seen some very badly machined cylinder heads made for the Imola kit.

SET UP

To set up the Imola cylinder you would need to fit a standard 150 cylinder base gasket, this needs cutting to suit the larger than standard transfer feeds.

Ideally your casings need tuning to match them to the kit.

Most cylinders depending on the casing height would not need a cylinder head gasket this should give a squish clearance of approximately 1mm perfect!

The Imola kit could be considered the top of the range kit for the 125 / 150 / 175 stud patterned engine, if modified and put together correctly.

PROS: Alloy cylinder good heat dissipation. Has the potential to be tuned for much higher horsepower compared to cast cylinders.

CONS: Very expensive! (Consider buying a 200 casing and converting to a 200 / 225 TS1) Long term the piston will fail its is not that good.

Requires a larger carb fitted on the offside of the scooter (a Battery tray may need removing) a new or modified exhaust is required.

Although the manufacturer recommends standard Li / Sx crankshafts and ignitions MB Developments recommend converting to GP race crankshafts and electronic ignitions.

MB Developments have already improved the Imola cylinder kit

The cylinder could be fitted with an iron liner then a variety of pistons could be used.

The cylinder can be modified to use a bullet proof Yamaha 65mm piston kit, then re ceramic plated. This can be done in two ways either machined to use the standard length con rod (107mm) or swap the con rod to Yamaha (110mm) which requires no machining.

Use the SRP race piston as a direct replacement,

MBD recommends machining 2mm from the cylinder base, this lowers the transfer timings to a good working timing. The Imola piston has a very high top piston ring so the top ring comes out of the cylinder, use a base gasket to prevent this, then machine a recess into the cylinder head to give a correct squish clearance. Then centralise the head with dowels. Or do the same but use the SRP piston as the rings are in a normal position this makes this conversion easier to do

MB DEVELOPMENTS RECOMMEND THIS IMOLA CYLINDER PACKAGE

Imola cylinder, reed block, inlet manifold,

SRP 64mm piston

Cylinder base machined

Road touring tune

28mm PHBH or VHSA Dellorto carb

Clubman exhaust

MB DEVELOPMENTS RECOMMEND THIS IMOLA TUNED CYLINDER PACKAGE

Imola cylinder, Yamaha racing reed block, reprofiled cylinder head

Race tune

SRP 64mm piston

Cylinder base machined

MB TS1 inlet manifold

30mm VHSA Dellorto carb kit

Devtour expansion system

MB DEVELOPMENTS RECOMMEND THE TOTAL IMOLA 190 KIT

As above but include

GP 200 Race / Touring crankshaft

GP AC / non battery electronic complete ignition system (Modified and strengthened by MBD)

Uprated bearings seals and gaskets

Und hier Bildchen:links ist jeweils der TS1 rechts der Imola

[Howie Munson]

Hab mit einem von Ernst Motorsport in Augsburg geredet, die haben angeblich die exclusiv Rechte dran das Ding zu vertreiben in Deutschland.

Es soll da zwei verschiedene geben, einen mit leichtem(Drehzahl) und einen mit schwerem Kolben(Haltbarkeit).

Laut denen absolut super und mindestens genauso gut wie ein TS1, aber vom Preis her kostet ein TS1 Motor halt nur mehr wegen dem großen Block.

Interressant wäre es trotzdem von Imola-Piloten zu hören.

[deluxe]

ich bin letzten herbst die cambrigde lambretta mit dem imola gefahren und muss sagen geht echt nicht schlecht.das erste das mir auffiel war das das ding sehr leise ist,liegt wohl auch an ihrem neuen auspuff!!??

laut trevor hat ihr demonstrator 23ps und abgehen tut sie auch gut.

kommt mir ein wenig vor wie ein t5 malossi das ding ,geht aber sauber ab

laut englischem mph tacho hatte ich so zwischen 80-85mph drauf.

muss ich auch haben,der complette kit kostet aber auch mal 800-900 pfunde :D