A question on leaded gas - Team Camaro Tech
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post #1 of 7 (permalink) Old Apr 30th, 01, 07:10 AM Thread Starter
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Location: Niceville Fl
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I have a mild 355 ci with about 9.5-1 and I was wondering if I would see a differance if I put a lead additive to my gas when i fill up? It has a 650 elelbrock carb and a mild cam. Will lead hurt the motor?
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post #2 of 7 (permalink) Old May 1st, 01, 05:46 AM
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As far as I know, lead will not hurt your car. It also won't help much. The only possible help would be if you did not have hardend seats in the heads. One of the functions for the Lead was as a lube for the valves.
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post #3 of 7 (permalink) Old May 1st, 01, 10:35 AM
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leaded gas is also better at stoping knocking and pinging. it will not hurt your motor.
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post #4 of 7 (permalink) Old May 1st, 01, 01:34 PM
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Complete waste of time and money for your setup - don't bother - won't help anything except the guy's wallet who sells it.

'69 Z28 Fathom Green
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post #5 of 7 (permalink) Old May 1st, 01, 05:08 PM Thread Starter
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thanks for all the advise guys
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post #6 of 7 (permalink) Old May 2nd, 01, 06:51 AM
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Its all in your head, literally. If you have a non stock head with hardened seats you dont need it. With the stock heads you may get valve seat regression over time without lead or a lead substitute. I always use a lead substitute in mine just to be safe.

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post #7 of 7 (permalink) Old May 2nd, 01, 05:20 PM
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The 9.5 to 1 depends on the cam and the quench area...if your quench area is .08" or bigger, your swirl and turbulance is in trouble and so is the burn rate and thus flame travel...this promotes detonation...
Choosing a proper cam as well as using aluminum heads as well as maintaining as small a quench area .04" is good...will all help keep detonation from occuring..
NOW..you CAN make more power with higher octance.... With higher octane, it allows you to get more over-all advance and allows you to re-set the distributor curve...thus pulling in more torque when it's needed...
Newer cars with computer control have a knock sensor in the block which signal the computer to RETARD(pull-back) the timing..thus loosing some low end torque..So using a higher octance doesn't ADD power..it allows the motor to be at it's best without reducing the timing due to detonation.. Lower compression motors generaly make MORE heat than higher compression, the lead in the fuel is to help the exhaust valve better disipate the heat..this helps prevent the seat from getting soft from too much heat..which leads to the seat dropping into the head from the pounding of the valve..
Also note that the LEADED fuel WILL cause permenant damage to the catalytic converter..

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