dante Posted March 29, 2007 Report Posted March 29, 2007 Does anybody know the specs for cool heads? 22mm = what compression? 21mm = ? 20mm = ? 19mm = ? I want to run pump gas with stock motor (moded) and currently have .030 shaved off my stock heads. I live in Virginia about 400 ft above sea level if this helps. Will I see a performance difference with the cool heads over stock? I need to know what domes to get... Quote
badassbanshee479 Posted March 29, 2007 Report Posted March 29, 2007 Does anybody know the specs for cool heads? 22mm = what compression? 21mm = ? 20mm = ? 19mm = ? I want to run pump gas with stock motor (moded) and currently have .030 shaved off my stock heads. I live in Virginia about 400 ft above sea level if this helps. Will I see a performance difference with the cool heads over stock? I need to know what domes to get... 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 Quote
dante Posted March 29, 2007 Author Report Posted March 29, 2007 (edited) Well does anybody know what is equivilent to a stock head shaved .030's? Is there any performance in buying a cool head vs a stock head shaved when running pump gas (93octane)? Edited March 29, 2007 by dante Quote
badassbanshee479 Posted March 29, 2007 Report Posted March 29, 2007 cool heads do run alittle cooler, and they give you the option of changing the domes when you decide to change up your engine combo. The after market domes also have a little different squish angle cut in them which will give a little performance difference. Quote
Animalman294 Posted March 29, 2007 Report Posted March 29, 2007 You may also check out the NOSS heads, they are a sponsor on here. Dave is a great guy and his heads are awesome on the shees............... Quote
dlnoss Posted March 30, 2007 Report Posted March 30, 2007 You should be okay with 21cc domes if you run premium pump gas unless your timing is advanced quite a bit. -David Quote
dlnoss Posted March 31, 2007 Report Posted March 31, 2007 As long as you run good fresh 93 octane, you should be okay with 21cc domes. Quote
bansheeboy02 Posted April 1, 2007 Report Posted April 1, 2007 20cc is the cutoff for regular gas 19cc usually uses race gas, 20 or 21 would be fine Quote
Banshee Eh? Posted April 3, 2007 Report Posted April 3, 2007 Hey guys I got my noss head and it says to check the squish clearance. LOL I feel a bit foolish but how do you do that? Thanks Kevin. Quote
dante Posted April 3, 2007 Author Report Posted April 3, 2007 20cc is the cutoff for regular gas19cc usually uses race gas, 20 or 21 would be fine So do you think 20cc will work with pump? Or should I stick with 21cc remember I'm 400 ft above sea level. Quote
SoCalinIt Posted April 3, 2007 Report Posted April 3, 2007 Hey guys I got my noss head and it says to check the squish clearance. LOL I feel a bit foolish but how do you do that? Thanks Kevin. Not foolish at all... Been there! OK... Take out your spark plugs... Get yourself a 9" long piece of solder... Make a hook type shape (or a "C") with it... Put the solder in the plug hole... Now, find the area of the dome that meets the cylinder... (it's the outside area where the dome step meets the jug) Make sure you are careful not to put the solder too far down in the jug... If you do, you have a chance of cutting a piece off the solder stick... (you will be splitting the cases!) Now, by hand push over the kick starter letting the piston "squish" the solder... Pull the solder out and measure the squish to your liking. Hope this helps! Quote
SoCalinIt Posted April 3, 2007 Report Posted April 3, 2007 So do you think 20cc will work with pump? Or should I stick with 21cc remember I'm 400 ft above sea level. The best way to know is by doing a compression check. You really can't be 100% without knowing how much compression you have in each jug. Remember the more compression, the more octane you need so you don Quote
dlnoss Posted April 3, 2007 Report Posted April 3, 2007 I'd be a little worried about 20cc domes at 400' on pump gas. Quote
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