pinging
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Road Captain
Joined: Jul 2008
Posts: 671
Likes: 19
pinging
Hi was looking for some ideas 92 evo 10.5 to 1 comp screaming eagle heads ev57 cam screaming eagle ingnition.When i let out the clutch in first gear i can hear a engine ping till i get the rpms up.Just did the timing 35 full advance.Mikuni 42 carb seems fine no backfiring through carb or pipes.Maybe voes giving me problem?using 91 octane fuel.Anyone have any ideas ?Thanks in advance
Seasoned HDF Member
Joined: Dec 2010
Posts: 7,736
Likes: 1,524
From: Coromandel Peninsula New Zealand
You can't run 91 Octane with that comp ratio mate.
Grab a can of octane booster and dose your gas, ride it hard and see if it goes away.
I ran 10.5:1 in a 96 Dyna with an EV-46 on 98 octane and nobody here would believe it wasn't pinging...I guess we just have better gas in NZ....
Grab a can of octane booster and dose your gas, ride it hard and see if it goes away.
I ran 10.5:1 in a 96 Dyna with an EV-46 on 98 octane and nobody here would believe it wasn't pinging...I guess we just have better gas in NZ....
Seasoned HDF Member
Joined: Aug 2007
Posts: 8,196
Likes: 3,086
From: NW AR
Spanners,
We use a different rating method for gas here. We use an average of two methods. 91 (sometimes 93) octane is the best we can get and that is about the same as your 98 octane, give or take.
I have a JDM 4AGE 20 valve motor in my Corolla, about 10.5:1. It calls for 100 octane, but that's 100 octane in Japan or Kiwiland, not by the US reporting methods. It runs fine on 91 or 93 here.
I agree that more octane may help him, but that's not terribly practical. We can get some real high octane gas but at about double the price and with very limited distribution (race gas, aviation gas, etc.) I suggest backing the timing off, especially if you have some type of control over it besides moving the entire curve. A more modern ignition system that allows you to pick what curve you want may do it. Otherwise, back the timing plate off until it doesn't ping. That's your only real choice here. Going richer on the lower end of the carb may also help some. And, of course, confirm that the VOES is working properly.
We use a different rating method for gas here. We use an average of two methods. 91 (sometimes 93) octane is the best we can get and that is about the same as your 98 octane, give or take.
I have a JDM 4AGE 20 valve motor in my Corolla, about 10.5:1. It calls for 100 octane, but that's 100 octane in Japan or Kiwiland, not by the US reporting methods. It runs fine on 91 or 93 here.
I agree that more octane may help him, but that's not terribly practical. We can get some real high octane gas but at about double the price and with very limited distribution (race gas, aviation gas, etc.) I suggest backing the timing off, especially if you have some type of control over it besides moving the entire curve. A more modern ignition system that allows you to pick what curve you want may do it. Otherwise, back the timing plate off until it doesn't ping. That's your only real choice here. Going richer on the lower end of the carb may also help some. And, of course, confirm that the VOES is working properly.
Last edited by Dr.Hess; Aug 4, 2011 at 06:46 AM.
Ultimate HDF Member
Joined: Jun 2007
Posts: 9,193
Likes: 494
From: Richmond, VA
35 degree's? Sounds like WAY to much timing. Thats MAX timing on any setup. Way to much for high compression and pump gas. No, I'm no expert but my Shovel had the same compression and we had to set it down to 32 to be even a little livable on the street and race gas was needed for any higher than that.
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Cruiser
Joined: Dec 2008
Posts: 234
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From: Courtenay, BC, Canada
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Cruiser
Joined: Dec 2010
Posts: 110
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From: central NC
Yeah I forgot to metion that. Mine was so bad it was salting the plugs until I went two heat ranges colder from a NGK BPR5ES to a BPR7ES. I keep a 2 ounce bottle of AMSOIL octane boost in my bag too. I dump it in from time to time and just refill when I get back home.
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Advanced
Joined: Apr 2010
Posts: 77
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From: Maricopa, CA
Im running 10:5 wiseco's in mine, and i rarely get pinging. Only time it may ping is if i lug the motor at slow speed in to high of a gear. U should be fine with engine knock up to 11:1 with colder plugs and premium fuel only with timing at or around 30-32 degrees, get rid of the voes if u can.