Cool Head Blowing O-Rings

[robert0762]

This is the second time it has happened and both times its been on the left cylinder. I do know how to correctly install the o-rings. I use plenty of grease to keep them seated . I also torque to the correct specs. in proper order and don't over tighten. My set up is 4 mill mx port . Domes cut by same guy who did port job . Site sponsor here. Chariot head 21 cc domes running a 50/50 mix. Jetting is a tad rich but very close. No signs of deto. The viton o-ring on the left cylinder will get a thinspot in it and allow water into the cylinder this has happened twice since I have had these higher compression domes. Prob bout six months apart. I'm gonna try it one more time then if it does it again I know I def got a prob somewhere. Any suggestions on where to look Possible things that may be causing this ?

[toytech]

did you check the cylinder decks when installed to make sure they match and are not warped?

[robert0762]

Bump

Edited May 18, 2012 by robert0762

[Larry's Shee]

X-2 on checking flatness of cyl. , might want to double check head. Did you use same dome in left side both times?

[hp2000]

What brand head?

[robert0762]

X-2 on checking flatness of cyl. , might want to double check head. Did you use same dome in left side both times?

 

 

Yes. But other domes no problem

Edited May 19, 2012 by robert0762

[robert0762]

What brand head?

 

 

 

 

Chariot

[Larry's Shee]

X-2 on checking flatness of cyl. , might want to double check head. Did you use same dome in left side both times?

 

 

Yes. But other domes no problem

 

If I'm understanding this, problem seems to be with that dome.

[ClayAiken]

Put the old domes back in? If im reading this right.

[shakar]

put alil sealer on the oring that keep blowing,but id check the deck with a straight edge first off.also check to see if the domes has a lil dent or blem....

goodluck

[mopar1rules]

If the old domes don't blow head o-rings, then its a problem with the new domes and not the flatness of the cylinder decks. I would bet the farm on it, that whoever cut your squish band, has the angle negative to the piston crown angle, instead of postitive. I've seen this before. Double check the angle of the domes and piston crown with a machinist plate protractor.