Sammy Posted March 28, 2009 Report Posted March 28, 2009 I'm getting ready to purchase a cool head for my ride. I'm intending on running leaded 111 in it. So I would like to know without welding the stock crank how small of a dome can I run? Ideally I would like to use 17's. But I have read that the cranks need to be welded b/c its a two piece design. I usually only really ride it twice a week for more that 30 minutes. Mostly on Sundays for a few hours at a time. How long do you all think the stock crank would survive that kinda compression? Quote
Darthwall Posted March 28, 2009 Report Posted March 28, 2009 I have had good luck with 19cc domes but I have allways had a trued and welded crank if you wanna run 111 I would say just put some 18cc domes in it unless you plan on running alcohol in the future and if you do I would definatly weld it for that Quote
locogato11283 Posted March 28, 2009 Report Posted March 28, 2009 where are you located? why do you want to run 17cc domes? i would recommend sending DLNOSS here on HQ a message. he will be able to tell you what you can get away with running with your setup. he is the guy who makes NOSSheads and who you should buy a head from. Quote
2001Stroker Posted March 28, 2009 Report Posted March 28, 2009 What size bore is it? Bigger bores use bigger domes for race fuel compressions. What stroke does it have? What elevation are you at? What's your normal air temperature? What is your timing set at? All of these things play a part in what domes you need to use. Quote
Sammy Posted March 28, 2009 Author Report Posted March 28, 2009 (edited) I'm located in Birmingham Alabama. It's a 64.5mm bore wiseco pro-lites, stock stroke. I want to bump the compression up high enough to make some good power and i don't mind having to run race gas in it. I was gonna buy a head from Jeff @ F.A.S.T they are made by Noss. Edited March 28, 2009 by Sammy Quote
2001Stroker Posted March 28, 2009 Report Posted March 28, 2009 If you're not going to true it and weld it, I wouldn't go any smaller than 20cc's. With 20's, you could run 50/50 93/110 and be plenty safe. You don't gain power simply by using higher octane fuel. Higher compression makes a little more lowend torque, but you typically lose redline RPM's. Quote
dlnoss Posted March 29, 2009 Report Posted March 29, 2009 Guessing you aren't much above sea level, I'd say 19cc domes. That's usually my recommendation for a stock crank at or around sea level. The difference you will notice between 19cc and 18cc wouldn't be worth the increased risk,,,,,,to me anyway. -David Quote
Sammy Posted March 29, 2009 Author Report Posted March 29, 2009 Yea I'm 600ft above sea level. 19cc's will give me approximately how much compression? the engine is very fresh it 64.5 mm bore, stock stroke, wiseco prolite pistons Quote
sheerider1026 Posted March 30, 2009 Report Posted March 30, 2009 i am running 19cc's in my bike. i am about 600ft also.. my compression is around 165-170.. i am running +5 timing and 93 pump gas.. stock crank, not welded.. it runs good.. like dave said, 19's would be as low as i would go also.. Quote
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