Ducati Sporting Club UK > DesmoDue Race Series > DesmoDue - General Questions and Chat > Full Monty Big Bore?

[the old man]

More of a question really; is anyone running a big bore that fully exploits the regs', ie., shorter inlets, bigger carbs, squish clearances optimised, cams degreed in etc?

[AK]

std carbs etc on ours

oh, and we have shortened inlets & the squish has been done (please can someone tell me what that is? )

AK wants to do mucho more, but hands are mostly tied by the reasoning that none of the parts from the engines in the series are interchangeable

C

[Edited on 9-6-2005 by CK and AK]

[ali]

Originally posted by the old man
More of a question really; is anyone running a big bore that fully exploits the regs', ie., shorter inlets, bigger carbs, squish clearances optimised, cams degreed in etc?

I think Paul Payne is running the best setup BB at the mo. He's running FCR39s and Malossi short manifolds, but I can't remember if the exhaust manifold is standard or not, and I've no idea if the cams have been set, ignition modified or squish set.

Ali

[skidlids]

I think you will find Paul Payne (Paynep) is running near enough the spec you mention, his bike certainlt seemed quicker at Castle Combe with the individual smoothbores now in place on short Mallossi manifolds. It has been set up by Moto Rapido so it should be one of the best BB bikes out there. But is still seriously compromised by the 400SS cylinder heads that are fitted to the 600s and are very restrictive on flow with there undersized valves etc.
Tony Brancatto says there is a lot he can do with my 583 engine and get a lot more power from it, sadly most of the mods are outside the rules,
I know Paul would like to try his 750SS heads on his 674. It would be interesting to see the results.

[skidlids]

Should point out that I do believe that a 674 BB bike with the smoothbores and some head work, but standard cams would be a match for a 5-speed 620 with a pipe filter and some fuel mapping..
6 speed versions have yet another advantage

[Rattler]

Originally posted by skidlids
I know Paul would like to try his 750SS heads on his 674. It would be interesting to see the results.

It would be very interesting - as the 750 belongs to his wife!!!!!

[paynep]

Originally posted by Rattler

It would be very interesting - as the 750 belongs to his wife!!!!!

Without wanting to give everything away, I will say that my bike is totally within the rules (including std flywheel !!!!) - with BB, Keihin FCRs, squish set by using a thinner base gasket, cam timing has been done but may be experimented with, and I'm running a std 2-1 manifold and what looks to be a very old DP exhaust can.

However there are a few things that haven't been fine tuned yet, so I expect to get a little bit more out of it yet.

Cheers, Paul

[AK]

can you tell me what squish is please ?

C

[Rob B]

Charlotte,

It's what happens when you put 15 people in a 10 person lift.

[TP]

Originally posted by paynep

Without wanting to give everything away, I will say that my bike is totally within the rules (including std flywheel !!!!) - with BB, Keihin FCRs, squish set by using a thinner base gasket, cam timing has been done but may be experimented with, and I'm running a std 2-1 manifold and what looks to be a very old DP exhaust can.

However there are a few things that haven't been fine tuned yet, so I expect to get a little bit more out of it yet.

Cheers, Paul

Ok, cool. Give us a number