Higher Compression= Higher Octane?
#1
Higher Compression= Higher Octane?
I recently rebuilt my 86 trx350. The orginal compression was 8.5:1, and I used a Wiseco piston giving it a 10.5:1 ratio. I have a slight valve rattle(pinging sound) while running under a heavy load in 3rd gear going uphill. If I am going uphill in third gear and it loses speed and I get on the throttle it will rattle until it gets up higher into the power band. Would running 89 or 93 octane be that much better than running 87? What kind of hp would you guess I have now as compared to the 25hp in had orginally? Thanks
#3
#4
Higher Compression= Higher Octane?
10.5:1 92 or 93 what ever the pump gives. On air cooled 11:1 you usualy want race gas but some times dont need it.
On water cooled 13:1 needs race gas but some times 12:1 needs race gas depending on the cam. Im 12:5.1 on mine and its just fine other than running hot.
Higher oct gas makes you run cooler.
On water cooled 13:1 needs race gas but some times 12:1 needs race gas depending on the cam. Im 12:5.1 on mine and its just fine other than running hot.
Higher oct gas makes you run cooler.
#6
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