GP150 cylinder - Mick Abbey Tuned - Back to the old school !
Posted: Thu Jul 30, 2009 10:49 am
Micks work on race bikes, TZRs, RS125s and the like is well publicised, his love for 2-stroke engines from FS1E 50s up to RD500s is unrivaled, and now Mick wants to start work on Lambretta and Vespa cylinders. We are establishing a close working relationship with Mick, and its proving fruitful for both of us, exchanging ideas and swapping tuning theories etc, its great fun and i'm enjoying it thoroughly.
So anyway, Mick asked if i had any old cylinders that he could play with, he just wants to get a feel for the different options on Lambretta and Vespa engines. So i dropped off a cylinder and piston that was just a doorstop in my garage, and when i popped back last night, i was surprised to see what Mick was doing with it......
Its just a piston ported 150 cyl, but Mick has done some great work so far, i'm particularly refering to the boost ports he's fed in up the back of the cylinder, that feed into the transfers. He has also started to open up the main transfers, exhaust, and inlet. NOTE: he is only half way through this so it will be much tidier when finished, and of course have more holes in it too! We havent meaured any of this up on a dry build yet, so there may be a few mistakes or mis-calcs at this point, but Mick is definitely on the right path, and as its a throw away item (or was until he ported it) it doesn't matter if we go too far or get this one a bit wrong, its just a practice unit. But i'm hoping that Mick does get this one right, and that we have a little 150 stonker on our hands.
I'm gonna run this on a 58mm crank, and use a 58mm piston to keep the bore/stroke perfectly square, JL4 pipe, 30mm Mikuni, AF close ratio box, 6 plate clutch, with lightened flywheel and sprockets and an Agusto or AddonV box. We really have no idea what this will kick out, but we are hoping for around 20+bhp at the back wheel. Ambitious? Yes, but its worth a shot just for research purposes....not to mention the sheer folly of it all.
Mick 'Worlds fastest Indian' Abbey is off to a flying start in Scooter tuning, long may it continue and we'll keep you updated as things develop.
It did look like this:
Now it looks like this:
Please excuse the marker pen on the cylinder where we have been drawing ideas in the cylinder, and its only a work in progress, so still a bit rough here and there......but the finished article should be very nice!
So anyway, Mick asked if i had any old cylinders that he could play with, he just wants to get a feel for the different options on Lambretta and Vespa engines. So i dropped off a cylinder and piston that was just a doorstop in my garage, and when i popped back last night, i was surprised to see what Mick was doing with it......
Its just a piston ported 150 cyl, but Mick has done some great work so far, i'm particularly refering to the boost ports he's fed in up the back of the cylinder, that feed into the transfers. He has also started to open up the main transfers, exhaust, and inlet. NOTE: he is only half way through this so it will be much tidier when finished, and of course have more holes in it too!
We havent meaured any of this up on a dry build yet, so there may be a few mistakes or mis-calcs at this point, but Mick is definitely on the right path, and as its a throw away item (or was until he ported it) it doesn't matter if we go too far or get this one a bit wrong, its just a practice unit. But i'm hoping that Mick does get this one right, and that we have a little 150 stonker on our hands.I'm gonna run this on a 58mm crank, and use a 58mm piston to keep the bore/stroke perfectly square, JL4 pipe, 30mm Mikuni, AF close ratio box, 6 plate clutch, with lightened flywheel and sprockets and an Agusto or AddonV box. We really have no idea what this will kick out, but we are hoping for around 20+bhp at the back wheel. Ambitious? Yes, but its worth a shot just for research purposes....not to mention the sheer folly of it all.
Mick 'Worlds fastest Indian' Abbey is off to a flying start in Scooter tuning, long may it continue and we'll keep you updated as things develop.
It did look like this:
Now it looks like this:
Please excuse the marker pen on the cylinder where we have been drawing ideas in the cylinder, and its only a work in progress, so still a bit rough here and there......but the finished article should be very nice!
Radical