Hello,
Recently was playing around with my 1972 16' Baja equipped with a 3 cylinder 1977 Evinrude 70 on it...
I noticed that I wasn't getting all the WOT rpm's that I used to get from the OB... seems that the plastic jacket over the wires going up to the timing advance plate, were getting "hung up" on the clamp just above the sync rod...
After opening up the clamp a little to allow the wires to float in the clamp, now my advance plate went all the way to the stop screw with no problem...
Soooo, now here's the question.... when running on 87 octane regular gas mixed with TCW3 oil in correct mix, at WOT I hear what I believe to be "pinging" or knocking....
I know I have no carbon issues on the top end and just put a set of fresh plugs in before yesterday's run...
I have heard through the grapevine (internet) that E10 fuel (obtained at a local automotive gas station on the way to the launching ramp) has a lesser ability to burn as well as older E0 fuel did of the same octane rating.... the BTU's produced by the E10 fuel are measurably lower than those of E0 fuel and have been reported to cause detonation or "pinging" in older engines such as mine...
Other than re-sync-n-link'ng and retarding the timing one revolution of the clamp screw and living with reduced performance of my engine, would anyone recommend using higher octane fuel (such as 89, 91, 95, CAM2 racing fuel) or an octane booster (104+, Gumout octane booster) to stop the pinging??
Would the boosters, or the more expensive fuel pose any problems regarding the health of my old OB??
Anyone else ever have a similar situation and how did you fix it???
Rich
Recently was playing around with my 1972 16' Baja equipped with a 3 cylinder 1977 Evinrude 70 on it...
I noticed that I wasn't getting all the WOT rpm's that I used to get from the OB... seems that the plastic jacket over the wires going up to the timing advance plate, were getting "hung up" on the clamp just above the sync rod...
After opening up the clamp a little to allow the wires to float in the clamp, now my advance plate went all the way to the stop screw with no problem...
Soooo, now here's the question.... when running on 87 octane regular gas mixed with TCW3 oil in correct mix, at WOT I hear what I believe to be "pinging" or knocking....
I know I have no carbon issues on the top end and just put a set of fresh plugs in before yesterday's run...
I have heard through the grapevine (internet) that E10 fuel (obtained at a local automotive gas station on the way to the launching ramp) has a lesser ability to burn as well as older E0 fuel did of the same octane rating.... the BTU's produced by the E10 fuel are measurably lower than those of E0 fuel and have been reported to cause detonation or "pinging" in older engines such as mine...
Other than re-sync-n-link'ng and retarding the timing one revolution of the clamp screw and living with reduced performance of my engine, would anyone recommend using higher octane fuel (such as 89, 91, 95, CAM2 racing fuel) or an octane booster (104+, Gumout octane booster) to stop the pinging??
Would the boosters, or the more expensive fuel pose any problems regarding the health of my old OB??
Anyone else ever have a similar situation and how did you fix it???
Rich