NOSS Head Dome sizing?

[Kunda]

Hey im just now orderin one a them NOSS performacne heads and was wondrin, wit a stock motor wit a CV carb kit 35mmpwk and toomey T5's, which CC domes'd give me da best results? Thanks much

[Blue Duece]

whats your elevation? wanna run race gas or pump piss?

[Kunda]

kinda mild elevation, not a hunerd percent sure but im in northern wisconsin right. Id prefer ta run race gas if possible.

[Blue Duece]

you could go 19's or even 18's, if you have a stock crank dont go hog wild with the compression, true your stock crank or just have the motor ported and built, the hotter your top end is the harder your bottom end will be getting abused by the piston rods......get a compression tester, i think around 160 psi you'll have to run race fuel, im at 180 psi and use 118 octane, and could probally be ok with 108, at 2-3 thousand feet..... david at noss knows his shit and will help you out, he has an elevation graph on his website you can find out on the internet, what the elevation is where you ride, but i think a chat with dave and a compression tester will be you best bet

[8buck]

This might be of some use...

 

 

 

Approximate Cranking Compression

 

These pressures are estimates based on fresh stock bore, piston, porting, and deck height.

 

It is recommended to check your compression after installation.

 

Sea Level 1000' 2000' 3000' 4000' 5000'

18cc 197....178...171...170..165...145

19cc 183....167...160...158..152...137

20cc 169....156...149...146..140...129

21cc 156....145...138...134..128...121

stock130....125...118...112..106...100

Edited May 19, 2006 by 8buck

[Kunda]

ok, cool, thanks much guys. Figured out im at 1500ft above sea, so wit a 19cc dome ill be right between 160 and 167psi. Then i could run like a 108 race fuel right? wont be too rough on a stock bottom end ya think? also my stock pistons should hold up id think, but what you guys think?

Edited May 19, 2006 by Kunda

[Animalman294]

Hey I have a better idea, get ahold of Dave (aka dlnoss) and he'll tell you exactly which ones to get. He would know all about it since he is the one that makes them. Good Luck............

[dlnoss]

ok, cool, thanks much guys. Figured out im at 1500ft above sea, so wit a 19cc dome ill be right between 160 and 167psi. Then i could run like a 108 race fuel right? wont be too rough on a stock bottom end ya think? also my stock pistons should hold up id think, but what you guys think

 

Sounds pretty good to me.