qboronyrican Posted February 27, 2010 Report Share Posted February 27, 2010 ok i dont know if i ever asked this before but here goes....i have a 4 mil stroked shee, aggressive trail port, case port matched, 35mm air strikers v forces, and curently running about 175psi in 60-80 degree weather @ sea level-800 above.....my questions are 1. what comression would i need to go down to to run straight 93 octane pump gas? 2. what will i be losing going down to that compression? 3. also what would i gain if i went up in compression and how much is the max i should go if i went that route? ..... race gas is getting to dam expensive for me to go ridding for 6 hrs at a time but if its going to cost me major power ill deal with it.......thanks for the info guys Quote Link to comment Share on other sites More sharing options...
qboronyrican Posted February 27, 2010 Author Report Share Posted February 27, 2010 ok i dont know if i ever asked this before but here goes....i have a 4 mil stroked shee, aggressive trail port, case port matched, 35mm air strikers v forces, and curently running about 175psi in 60-80 degree weather @ sea level-800 above.....my questions are 1. what comression would i need to go down to to run straight 93 octane pump gas? 2. what will i be losing going down to that compression? 3. also what would i gain if i went up in compression and how much is the max i should go if i went that route? ..... race gas is getting to dam expensive for me to go ridding for 6 hrs at a time but if its going to cost me major power ill deal with it.......thanks for the info guys someone has to have some insight, thoughts. acual knowledge on this Quote Link to comment Share on other sites More sharing options...
firebanshee Posted February 27, 2010 Report Share Posted February 27, 2010 ok i dont know if i ever asked this before but here goes....i have a 4 mil stroked shee, aggressive trail port, case port matched, 35mm air strikers v forces, and curently running about 175psi in 60-80 degree weather @ sea level-800 above.....my questions are 1. what comression would i need to go down to to run straight 93 octane pump gas? 2. what will i be losing going down to that compression? 3. also what would i gain if i went up in compression and how much is the max i should go if i went that route? ..... race gas is getting to dam expensive for me to go ridding for 6 hrs at a time but if its going to cost me major power ill deal with it.......thanks for the info guys You would need to go down to 160 or below to run 93 octane. You would lose some bottom end grunt on your motor(torque).If you went up from were you are in compression you would lose over-rev on your top end. I like having around 180 compression, think that is right around the sweet spot if you run the fuel that supports that kind of compression. What dome size are you running now? Quote Link to comment Share on other sites More sharing options...
qboronyrican Posted February 27, 2010 Author Report Share Posted February 27, 2010 im not to sure what domes are in there now ...they are dimes made by hjr for the 4 mill but i do know im right around 175 psi on each side....would i really be able to feel the difference between 173 and 160 on the bottom end? is it a big difference? Quote Link to comment Share on other sites More sharing options...
firebanshee Posted February 27, 2010 Report Share Posted February 27, 2010 im not to sure what domes are in there now ...they are dimes made by hjr for the 4 mill but i do know im right around 175 psi on each side....would i really be able to feel the difference between 173 and 160 on the bottom end? is it a big difference? I don't think you would feel that much difference since you have a 4mil crank. It does not sound like you are a drag racer so i would give it a try and see if you like it. It is not that hard to swap out domes. Quote Link to comment Share on other sites More sharing options...
qboronyrican Posted February 27, 2010 Author Report Share Posted February 27, 2010 no im not a dreg racer and thats why i thought of going down and saving some money ....all i do is alot of open trails with a bunch of coal hill climbs and some tight trails so do think i need that little extra down low Quote Link to comment Share on other sites More sharing options...
firebanshee Posted February 27, 2010 Report Share Posted February 27, 2010 no im not a dreg racer and thats why i thought of going down and saving some money ....all i do is alot of open trails with a bunch of coal hill climbs and some tight trails so do think i need that little extra down low I would try it and see if it works for you. I have a t-5 bike that runs on pump gas and it is not a stroker, it works good for that kind of riding, a t-5 is a mid to topend pipe. Quote Link to comment Share on other sites More sharing options...
qboronyrican Posted February 27, 2010 Author Report Share Posted February 27, 2010 as long as i can same some money and still be able to smoke the 450's and 500's i ride with then im happy.....just got to figure out how to really hook up as good as them or ill be playing catch up Quote Link to comment Share on other sites More sharing options...
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