Combustion chamber volume for a 90 on 40% nitro.

[Ian Inverarity]

Hey guys,

Can anyone help me out with what the combustion chamber volume should be for a 90 engine for 40% nitro? I can accept volume, geometric, or trapped compression ratio! ;D

Nitrocrazed racing: More nitro....

 

[EatMyShortsRacing]

What you up to there?

Modding 90s for other people now??

LOL

EMS Racing outsourcing again

 

[Ian Inverarity]

Gee I wonder...

1.0 cc bowl was what I got from Ron VanWagnen on rcboat.com ;D

Disc timings are all over the place (vastly different between the motors) and I think liner shims may be required here. ;D

Nitrocrazed racing: Will mod motors for trade of new bits.

 

[EatMyShortsRacing]

Hmmmm well so long as they end up the same I will be happy...

EMS Racing twins R us

 

[EatMyShortsRacing]

Oh yeah, 0.95 to 1.0 cc sounds fine....

EMS Racing who needs compression anyways...

 

[Ian Inverarity]

Ron said 1.0cc was good for up to 50%, did you want to try 0.95cc for 40%?

Nitrocrazed racing; Bigger starter needed!

 

[EatMyShortsRacing]

go the 0.95

can always decompress

EMS Racing it is hard to add metal back into engines

 

[Ian Inverarity]

Craig,

I have had some interesting emails from Dave Marles on this subject, I might do two sets of heads for you to try. ;D

Nitrocrazed racing: MORE compression! 8)

 

[TimD]

Two heads are better than 1! (especially in Tasmania :-* )

Craig, are you going to test in your mono then transfer to the twin? If not then that means 4 heads are better than 2!

 

[EatMyShortsRacing]

Tim,

Are we going to count the 3 pairs of heads I originally did as well as the water cooled plug heads???

EMS Racing not enough head?