cool head question

[blazinlow]

i just installed a cool head with 22cc domes how low of domes can u use before u should do work to your crank i mostly ride around deleware and new jersey. would 20 or 19 cc domes create a problem how much compression can your stock pistons and crank take before failure?

[Bansh-eman]

when you start adding power by porting and upping your compression its smart to weld your crank.

 

if you have the 120 bucks do your self a favor and get some weisco pro lites and can those stock pistons... they are much stronger....

[tmac20031]

when you start adding power by porting and upping your compression its smart to weld your crank.

 

if you have the 120 bucks do your self a favor and get some weisco pro lites and can those stock pistons... they are much stronger....

This is the best advice your going to get. I think youll be fine down to 20cc domes but if you go any lower then take bansh-emans advice.

 

you do know 22cc is stock?

[Toomey Banshee]

I've run 20's on my 99 for 3 or 4 seasons. Have to mix 2 gallons of race fuel with 3 gallons of pump gas, no problems to date.

[blazinlow]

i was told 26cc is for a stock head that gives u about 120 psi per cly when u goto 22 u get about 155 to 157 psi

[Satsol67]

i was told 26cc is for a stock head that gives u about 120 psi per cly when u goto 22 u get about 155 to 157 psi

 

 

 

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

stock 130 125 118 112 106 100

[shanYE west]

22cc at sea level should be 145psi while stock should be 130.

 

so the 22cc domes is still higher compression then stock.