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What the best gasoline mix to use?
What do you think is the best mixture of fuel to put in these beasts? (In my case, '66 427 FE bored and stroked with something like 11:1 compression ratio). In my case the purpose is not for racing, but rather for tooling around town (with occasional moments of showing off). ;)
50% aviation gas? (Someone told me "yes", someone else told me, "it's too dry- formulated for 30,000 feet altitude"- whatever that means) 50% racing gas? (How do you really know what's coming out of that 55 gallon drum- hell, it could be french fry oil- these guys know I'm not a regular nor a racer). 93 octane with 4 bottle of octane boost? (42 gal. tank) Real Lead (can you still get that stuff?) Copious amounts of Sta-bil? What's the best bang for the (big) buck? I suppose this has been discussed before, but I did a search but the number of times "gas" comes up is nearly infinite. Thanks. |
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If you have aluminum heads you can get by on less octane. With my iron heads I can get by cruising around with about 5 gallons of 110 leaded racing gas to 15 gallons of pump gas. But the hotter it gets here, the more racing gas I have to add to avoid pinging. Also my CR is just 10.5/1.
Ron |
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Pump gas meaning Sunoco Ultra? (93 oct) |
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91 octane seems to be the max in sunny Calif.
Where is that 100 octane Chevron White pump? THAT was some GOOOOOD stuff! |
CSX4039,
In a pinch I have used JUST Sunoco Ultra with no ill effects. NOrmally a combination of 2/3 Ultra and 1/3 Sunoco GT/GT+ or aviation fuel plus toluene. |
Gotcha Rick,
BTW my cr is 10.5:1 alum block and heads. |
What Gas?
with a 11:1 and alum. heads i find pump gas works with no ping (maybe)
however i do notice a 10-15 deg hotter temp with pump gas alone. the "real lead" that was mentioned does exist and works well. i use 1\2 quart of the stuff linked at bottom in a full tank and i can idle at traffic lights all i want even the sound of the motor is better, it really likes it. this product is tetraethyl lead. i cannot tell the difference in driving or plugs comparing racing fuel(leaded 110) or 93 octane exxon\mobile with kemco's lead added www.kemcooil.com/products.php?cId=4 |
If thats the case, and his timing is set similar to mine, 38deg. all in @3000rpm, 93 oct is probably the lowest I should go.
Good info. IMHO. |
FWB,
The alternative to Sun is Amoco/BP Ultimate 93. |
lehigh valley?
bret where are you? im in the lehigh valley
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I got SO tired of mixing gas to get a higher octane, I rebuilt the motor. Couldn't be happier. OK, a fairly radical approach. :D
But IF I had an all ready great motor and wanted to 'simply' reduce the compression ratio to a reasonable level, I'd go with THICK head gaskets to increase the combustion chamber size and thus lower the c.r. No matter how you cut it, 'mixing gas' gets old, quickly. |
It wasn't too long ago guys in PA. could get 94 without ethanol. Now 93 with ethanol is the best it gets for pump gas.
How does ethanol affect performance? Are they going to keep ethanol in the gas all year now? |
head gsk's
if i was at say 10:1 the head gasket approach would be fine. at 11:1 to get down to say 9:1 the gasket would be so thick to change the cc of the head
that my rocker geometry would be binding. the cr is not the only factor in gas requirement. cly head flow, camshaft, and stroke play a significant role in this also. the limited driving i do with the car wouldn't make me change the build so i don't have to add a half quart of lead. remembering to keep the quarts in the trunk is the hard part. |
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Hmmmmm
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get before she pops. Note: my wifes name is not quart |
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Thanks for the info.
Car does not currently ping, but I've never run it on just 93 octane. Didn't even think to try. I'm not sure what my octane is in the tank. I just go into the store, buy a bunch of octane stuff and pour it in. My friend who works on it, in exchange for defying the grim reaper between my town and his, comes and biopsies my wallet and puts 10+ gals of race gas in it at a time. I call whatever is in there "gas gumbo". If high price = high octane, than I'm running a solid fuel booster. Problem is, the place where he gets it is other side of the county, and I live not too far from the airport. Anybody got a problem with aviation gas? He says, "don't do it"......? As far as all the technical stuff, I opened a pandora's box, because, unfortunately, I wouldn't know a cam shaft from a colonoscopy. I wish I did, though. :) |
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