drbanshee Posted April 26, 2010 Report Share Posted April 26, 2010 I have a 4mil banshee, port and polished, pro design coolhead, v-3 reeds, 19cc domes, stock bore 64mm, compressions 125psi on both sides. I want to go up on compression. I am thinking to go with 17cc domes. My elevation is 6700. I was wondering if this would be a good idea so I can run 110 race fuel? Thankyou you guys for your time. , Quote Link to comment Share on other sites More sharing options...
Drewski Posted April 26, 2010 Report Share Posted April 26, 2010 Do it! Quote Link to comment Share on other sites More sharing options...
jbooker82 Posted April 26, 2010 Report Share Posted April 26, 2010 Yea knock your self out. You want to shoot for around 185 psi of compression for straight 110 race fuel. Makes for a good boost in midrange. You will probaby have to swap domes back out if you ride at a lower elevation. Quote Link to comment Share on other sites More sharing options...
drbanshee Posted April 26, 2010 Author Report Share Posted April 26, 2010 Yea knock your self out. You want to shoot for around 185 psi of compression for straight 110 race fuel. Makes for a good boost in midrange. You will probaby have to swap domes back out if you ride at a lower elevation. Do I need to advance my timlmg I have +4, and what compression do I need to run 50/50 mix (91 and 110)? Thanks for your help I appreciate it. Quote Link to comment Share on other sites More sharing options...
jbooker82 Posted April 26, 2010 Report Share Posted April 26, 2010 Do I need to advance my timlmg I have +4, and what compression do I need to run 50/50 mix (91 and 110)? Thanks for your help I appreciate it. No just leave it at +4 that is what was recomended to me by jeff at fast. I did have a drag ported cylinders by Patriot Racing they recomended +6 deg with race fuel. It is hard to say what compression you need to run 50/50 mixed. Since you can get away with 150 psi on 91 and you run race fuel at 185 psi I would say half way in the middle so around 165. Quote Link to comment Share on other sites More sharing options...
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