Nitmare67 Posted July 18, 2007 Report Posted July 18, 2007 I am currently running a 20cc head on my motor and run 150psi. I dont mind running race gas. I am thinking about changing to 18cc domes hoping for around 180psi compression. I already mix 50/50 c110/91. For the amount of riding I do I dont mind the price of gas. My crank is welding and Jeff at Fast racing just built my motor. The porting was done by Eric Gorr awhile ago but the bottom end is all new. So...... Motor Stock bore and stroke Dune port job t5 pipes Stock carbs but soon to upgrade to either 28s or 33s before or at same time as domes Vforce reeds +4 timing advance Welded Crank Tranni Mods K&N pods Who is running this much compression and what gas? How does it run? hat should I worry about? Will I notice a nice increase over what I am running now? THANK ALOT GUYS Quote
Speed freak Posted July 18, 2007 Report Posted July 18, 2007 I am currently running a 20cc head on my motor and run 150psi. I dont mind running race gas. I am thinking about changing to 18cc domes hoping for around 180psi compression. I already mix 50/50 c110/91. For the amount of riding I do I dont mind the price of gas. My crank is welding and Jeff at Fast racing just built my motor. The porting was done by Eric Gorr awhile ago but the bottom end is all new. So...... Motor Stock bore and stroke Dune port job t5 pipes Stock carbs but soon to upgrade to either 28s or 33s before or at same time as domes Vforce reeds +4 timing advance Welded Crank Tranni Mods K&N pods Who is running this much compression and what gas? How does it run? hat should I worry about? Will I notice a nice increase over what I am running now? THANK ALOT GUYS you will be fine 180psi is not all that uncommon .....thing to remember about higher compression after a certain point you start sacraficing top end power Quote
Snopczynski Posted July 18, 2007 Report Posted July 18, 2007 That equates to 100 octane, you will be ok at 180 psi. Quote
dajogejr Posted July 18, 2007 Report Posted July 18, 2007 Ran 110 octane in my 4 mil cub, A LOT of timing, 110 was fine...it had 185PSI. Quote
Nitmare67 Posted July 18, 2007 Author Report Posted July 18, 2007 Overall a much quicker bike or will I be sacraficing much top end power? Thanks alot guys for the quick responses. Quote
370banshee Posted July 19, 2007 Report Posted July 19, 2007 at 180 yoiu'll be fine.. and will not sacrifice top end power.. you need more compression than that.. my 4mm motor has 182psi compression and i run it on av100ll with no problem at all Quote
Nitmare67 Posted July 19, 2007 Author Report Posted July 19, 2007 Awesome thanks alot guys. Going to order up some 18cc domes. Should put me in the 180 range. Think I will just drop a nut and buy new intakes and 33 pwk carbs also. Its only money right you only live once haha. Quote
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