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jimberg · 08-21-2001, 03:27 PM

Rev, I've recently noticed something that sounds like pinging. It will usually occur when it's hot out, the engine temp is up, and I'm in fourth gear starting to accelerate (WOT) at like 2500 rpms. If I just took off like I was in a race or something, there's no problem that I can hear. My plugs always look fine when I take them out.

One big change I've made recently is that I use Amoco Ultimate instead of the Sinclair non-oxygenated premium. I can't say for sure if the change coincides with the occurance of the problem.

I figured that getting higher octane fuel would at least help me isolate it to the engine and not just some external rattling somewhere. I was hoping that someone would have a quick answer and I'd just go get a fill up there and see how it works.

Skeeter, BTW, gave me a great web site. There's a station with unleaded 100 octane about 7 minutes away from where I work. I'm hoping that it's just pure gasoline, and if it is, should I just try it out once and see if there is an improvement? And if there is, I can start figuring out what to do about it so I can use the 92 octane.

I kept my compression fairly low with the idea of going with a power adder at some point, so it's 9.4:1 or thereabouts. My base timing is at 14 right now giving me total timing of 34. Trick Flow recommends 34-36 so I would like to try to move to 16 at some point or at least take it to a dyno and see what timing gives me the best performance.

I am also just curious if any stations have better than 92. For some reason all the stations in the north suburbs of Chicago carry 93 octane while Twin Cities stations only have 92.

Thanks for any help you guys can offer.

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351W 89 Mustang GT Convertible

[This message has been edited by jimberg (edited 08-21-2001).]

08-21-2001, 03:27 PM	#10
jimberg Registered Member Join Date: Oct 1998 Location: Rogers, MN Posts: 2,089	Rev, I've recently noticed something that sounds like pinging. It will usually occur when it's hot out, the engine temp is up, and I'm in fourth gear starting to accelerate (WOT) at like 2500 rpms. If I just took off like I was in a race or something, there's no problem that I can hear. My plugs always look fine when I take them out. One big change I've made recently is that I use Amoco Ultimate instead of the Sinclair non-oxygenated premium. I can't say for sure if the change coincides with the occurance of the problem. I figured that getting higher octane fuel would at least help me isolate it to the engine and not just some external rattling somewhere. I was hoping that someone would have a quick answer and I'd just go get a fill up there and see how it works. Skeeter, BTW, gave me a great web site. There's a station with unleaded 100 octane about 7 minutes away from where I work. I'm hoping that it's just pure gasoline, and if it is, should I just try it out once and see if there is an improvement? And if there is, I can start figuring out what to do about it so I can use the 92 octane. I kept my compression fairly low with the idea of going with a power adder at some point, so it's 9.4:1 or thereabouts. My base timing is at 14 right now giving me total timing of 34. Trick Flow recommends 34-36 so I would like to try to move to 16 at some point or at least take it to a dyno and see what timing gives me the best performance. I am also just curious if any stations have better than 92. For some reason all the stations in the north suburbs of Chicago carry 93 octane while Twin Cities stations only have 92. Thanks for any help you guys can offer. ------------------ 351W 89 Mustang GT Convertible [This message has been edited by jimberg (edited 08-21-2001).]