Cool Head 20-22cc Compression

[Pedro]

I wanted to see if anybody canhelp me? I have a set of 20cc domes and I am at sea level, what compression shuld it have and is it ok to run pump gas on that motor? Whats the max psi to runon pump gas to be safe and run it all day? I need help!!!

[captainhowdie]

My last stock motor with 20cc domes @ sea level had 160lbs and i ran premium with no problems.

[dragbanshee]

Running 20cc domes at sea level, I would think your compression is up there, I think I would be running some mix. Need to check the compression and let us know what you have, how was your compressin before the 20cc domes?

[Pedro]

The problem is my head was cut and was showing 140psi. I will do a compression check on monday when I put it on to see what psi I have. What do you recomened I run with pump gas?

[dragbanshee]

The problem is my head was cut and was showing 140psi. I will do a compression check on monday when I put it on to see what psi I have. What do you recomened I run with pump gas?

 

 

Someone will help you out there, Im at 150 so I can run safely on 93 at 650 asl with 21cc domes.

[dragbanshee]

BTW Welcome to the site Pedro.

[Pedro]

Thanks

[alf44]

I run 20cc domes at sea level with all the mods in my sig. U can run straight Super unleaded. I run half 110 sunoco and half super. welcome too the site. let me know if i can help you anymore.

[gst_r]

uhmmm i know maybe it is off topic....but right now i have head milled.... my compression is 130 (maybe i will need to buy a good compression tester), stock stroke, sea level.....i was thinking on buying an aftermarket head and put some 21 domes this will give me (according to the chart at noss site) 150 psi...but the question is......will i notice some improve on performance by the increase of compression? thanks

Edited September 20, 2009 by gst_r

[bada450r]

uhmmm i know maybe it is off topic....but right now i have head milled.... my compression is 130 (maybe i will need to buy a good compression tester), stock stroke, sea level.....i was thinking on buying an aftermarket head and put some 21 domes this will give me (according to the chart at noss site) 150 psi...but the question is......will i notice some improve on performance by the increase of compression? thanks

i think stock compression is 130 or 135 and yeah you should notice a little improvement in perfprmance[down low] if you go to a 20 or 21 cc dome ..am also at sea level and have runned pump gas with 20cc domes with no problems.....but when running pump gas you also cant advance your timing to much...hey gst r how are the drags down there? i have family in mexicali but have not being ridding down there in a long time i knkow they drag on sundays en la salada...maybe ill check it out one of this days

[bansheebarnes]

how about compression with 22cc domes?

[gst_r]

i think stock compression is 130 or 135 and yeah you should notice a little improvement in perfprmance[down low] if you go to a 20 or 21 cc dome ..am also at sea level and have runned pump gas with 20cc domes with no problems.....but when running pump gas you also cant advance your timing to much...hey gst r how are the drags down there? i have family in mexicali but have not being ridding down there in a long time i knkow they drag on sundays en la salada...maybe ill check it out one of this days

 

i guess i will try the aftermarket head....and yes on the salada you can find good drag bikes....but right now still hot out there....i went the last weekend and few bikes were present....today im going to the dunes near the aiport...i will try again the salada dunes or cuervos dunes when the weather gets colder...if you came someday let me know....