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post #1 of 3 (permalink) Old 07-25-2002, 05:16 PM Thread Starter
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ignition timing vs power

First a little bit of info for those who can't remember, the engine is a 460 with heads from a 429, diving it a compression ratio of about 10:1 or more. Now, Gas is expensive, and when I first wanted to start the motor up to see if I had everything connected(I didn't, but once I did...) I was using 87 or whatever the cheapest gas you can buy at the pump is. The engine didn't sound like it was running right, and I figured that the distributor was off. So, with the engine running I fiddled with it and fiddled with it until I got it so it sounded fine. Now, it gets HOT here in ontario, contrary to what you might think. Days recently have been 40-45 with the humidity(that's like, 110 or so I think). So like, 100 or so w/o humidity. What I'm wondering is, I'm guessing that the reason I'm able to run on such low octane gas with this compression and this heat is because I've inadvertently retarded the ignition timing. Question is, if I decided to try running on 93 octane, would I be able to gain much power by advancing the ignition? If it's only 10-15hp, I figure I'm better off saving myself the money unless I plan on taking it to the strip. Any thoughts?
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post #2 of 3 (permalink) Old 07-25-2002, 05:36 PM
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ignition timing vs power

I was able to run my 429 thunderjet on regular 87 octane.I ran a 750 holley on it and it ran good.If I used a stock ford carb off of an early 70s 460 Lincoln motor(600 cfm I think) the 429 got great mileage 15-17 mpg but you could not step on the gas at all or it would ping like crazy.The holley only got about 12 mpg but you could use the power.The engine was very hard to start when it was hot though,even with a 950 cold cranking amp battery it would hardly roll over.Heavy duty battery and starter cables were a must!This was originally a two barrel motor so compression was only 10.5:1 and not 11:1 like the four barrels.Like you say the engine would run better on 93 octane but I couldn't afford it in a daily driver pickup.
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post #3 of 3 (permalink) Old 07-25-2002, 05:38 PM
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ignition timing vs power

My .030 over 460 10.5 to 1 runs (ok) on 93 pump at 35 degrees total timing.Loves a mix of 7 gals 110 and 12 gals 93,then I can up timing to 38 to 40.Running on the street I leave it at 35 otherwise she runs to hot.
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