3 replies to this topic

[9FDXEH4]

Hi there.

I'm in doubt in the choice of the crankshaft for my small bore engine.

whitch is better to find more power output?
the 997 crank has a little bit more stroke than 998 ( 81.28mm VS 76.2mm)

with the bore of a standard 998 (62.93mm) using the 997 crankshaft i will not lose to many top rpm?
can i get a little more torque using this crankshaft without compromise the so good rpm like a std 998 boreXstroke?

will the A plus conrods fit straight onto a 997 crankshaft?

Hope you can help

Cheers

[Wil_h]

If you use the 997 crank you'll need the 997 rods too. The 997 was never a loved engine and you'd be better with 998 parts IMO.

What is the rest of the spec of the engine you are considering?

[9FDXEH4]

If you use the 997 crank you'll need the 997 rods too. The 997 was never a loved engine and you'd be better with 998 parts IMO.

What is the rest of the spec of the engine you are considering?

take a look please:

http://www.theminifo...howtopic=106914

[Wil_h]

With that cam stick to the 998 crank. I'd also advise nitriding the crank, as with even a half decent head you'll easily see over 8k rpm.

I know plenty of people with small bores running 286 cams successfully, 295 may be too much, but you'll only find out of you try it. the 276 is a great 998 cam, with propper ignition (mapped, not dizzy) the 276 is not lumpy and will give power up to 8k.