80 inch build
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Road Captain
Joined: Jul 2008
Posts: 672
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From: Winnipeg
80 inch build
Hi was hoping some evo guys can help did my motor screaming eagle heads,Pistons 10.5 to 1 didnt go over size on the pistons EV57 cam screaming eagle coil and module.Bike runs great but get slight pinging when giving lots of trottle some guys are telling me to adjust my voes.Would you evo experts agree?I have been reading were people say that high compression motors the stock voes might need to be adjusted to get rid of pinging
Elite HDF Member
Joined: Sep 2007
Posts: 4,468
Likes: 12
From: Bluffton, South Carolina
Always try to get your fuel at a station that has three hoses at each pump, one for each grade fuel. This is because the hose and pump are full of whatever the last person pumped (usually regular). So if you get three gallons of fuel the first one is regular and the rest may be high test. Hope this helps.
Elite HDF Member
Joined: Sep 2007
Posts: 4,468
Likes: 12
From: Bluffton, South Carolina
The screaming eagle modules are known for bringing the advance in rather quickly and can have a tendency to ping. This can be compounded by heavier bike/rider combo and higher gearing. Plus you have the 10.5 pistons which can be borderline with todays fuel.
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Seasoned HDF Member
Joined: Aug 2008
Posts: 5,080
Likes: 2,154
From: Ohio
10.5 with Screamin eagle heads can be a battle, the EV57 is letting some air out of it to help. Need to know where your afr's are when the detonation is occuring, could be lean when rattling or a simple timing retard or voes adjustment needed. Programmable ignitons are nice to have when tuning high compression, you are splitting hairs with that compression between performance and detonation but checking fuel is first to prevent future problems, I've walked in your shoes.
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Seasoned HDF Member
Joined: Aug 2008
Posts: 5,080
Likes: 2,154
From: Ohio
Works the same by manifold vacume, it pulls timing when manifold vacume is less but you want full advance for performance when in the upper rpm giddy up area
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