randelator Posted March 18, 2005 Report Share Posted March 18, 2005 hi i just bought a cool head,and the dome size is erase so befor puting thats thing on i want to determine dome size ,my way for checking thats is put a plug in the spark ^plug hole and fill with water with a seringe ,but the probleme is thats i dont know if i only fill the cup or if i fill till it come equale of the squish band(lips)please help me thanks by the way sorry for my english i am french i read better than i write Quote Link to comment Share on other sites More sharing options...
dave95.1 Posted March 19, 2005 Report Share Posted March 19, 2005 pm dlnoss, i'm sure he'll help you out. I would think you should fill the dome completely but not sure. Quote Link to comment Share on other sites More sharing options...
dlnoss Posted March 19, 2005 Report Share Posted March 19, 2005 Fill it all the way with the spark plug installed. I use rubbing alcohol because of the lower surface tension and a plexiglass plate clamped to the base. Quote Link to comment Share on other sites More sharing options...
randelator Posted March 19, 2005 Author Report Share Posted March 19, 2005 Fill it all the way with the spark plug installed. I use rubbing alcohol because of the lower surface tension and a plexiglass plate clamped to the base. 341533[/snapback] thanks a lots,if i hav don it correctly i have 20 cc is it ok to run 20cc with pump gaz and +4 timing Quote Link to comment Share on other sites More sharing options...
dlnoss Posted March 19, 2005 Report Share Posted March 19, 2005 You are kind of in a grey area at 500' with +4 timing. Check your compression. If over about 155, I'd bump the octane up some. Quote Link to comment Share on other sites More sharing options...
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