t5 tuning

[ducksta]

just bought a t5 engine with a pollini top end on, looking to build a reliable fast tourer any ideas on spec crank , stroke, ,exhaust, clutch, top end etc and do i keep the pollini or bin it?

[LI150]

To me the best thing for a T5 is malossi 172, T5 4th geat, 21 tooth clutch and a standard/ sito exhaust, standard carb. But as you have a polini it would be worth speaking to Diablo about keeping it and what can be done

[gimp1971]

Al built one for Mongo with a Polini which is posted in the dyno section as is my 172 reedvalved which is an older 1 but should be re dynoing it soon as its got a Taffy exhaust and 21 tooth clutch now

[Mongo]

Ducksta - my spec was Polini barrel bored out to 64mil, Suzuki TS185 piston, Standard flowed crank using an eccentric crank pin to add extra stroke, mmw cylinder head, standard carb, 135mj, Taffspeed exhaust and MTEC advance retard on level 9. It gives just over 19bhp and just over 16ft/lb torque. On the road it'll achieve 70 easily. Revs as a T5 should, but with the added advantage of more torque. I think Al put taller gearing in it as well. There's a dyno printout of it on the Vespa dyno chart on here. Hope that helps.

[ducksta]

that sounds interesting the pollini spec, i run a 172 malossi 21 tooth cosa standard carb standard crank no porting simmonini exhaust 76mph with 20 stone on it lol 15.9 tourqe but screams wanted something less screamy for touring

[roadrunnerian]

I run a a suzuki 185 piston conversion with everything else standard great set up lots of torque i have a 21 tooth instead of 20 may need a 22 thou had 16.5 bhp on the dyno running with a jl rhs exhaust well chuffed

[ducksta]

who did the conversion for you roadrunner and is it a long stroke where do i get a crank done (chislespeed ?)

[roadrunnerian]

Hi Ducksta yes Martin did my conversion but only on the top end we didn't touch the crank or casings. just a bolt on cylinder etc. hope this helps m8

[ducksta]

this is just for mick1 76mph on the speedo!!!!!!!!!

[mick1]

LOL....i thought we'ld established your scoot wouldn't go over 55mph (GPS) and the 76 mph on your speedo was down to beer !!