Lead Additive/Octane Booster

[Gaz64]

Originally Posted by BAsque1

Chas:
I understand the risk of handling the lead, and I agree.

The car has a 427 SO which was dynoed at 550 hp at the rear wheels 3 years ago, so displacement and power is not the issue, especially since I do not race this car.

I did tried the timing other than 8* BTDC and the engine diesels after I turn it off, so the best timing to avoid this was 8* 750 RPM in idle.

I have not touched the cam nor I have any info that the previous owner did,however, it seem that it is a mild cam.
Thank you so much for your detailed comments man. Your last statement wraps it well, I will leave it as is, I am happy with that.
Cheers
Lou

Originally Posted by ERA Chas

Lou,
I respectfully disagree with your stated power numbers. In order for you to make 550 at the wheels, it needs to make 643 at the crank. No 427-sized FE in my experience will make 1.5HP / CI on pump gas with iron heads and 8 degrees at idle, and still idle at 750. If you were told these numbers by previous owner I understand the misunderstanding. If you witnessed the numbers and have dyno data yourself, please post.
My 427 makes 550 at the crank and 462 at the wheels. And runs on 93 octane with 22 initial and 38 total.

I have to agree here.



Lou,
If your engine runs-on at anything above 8 degrees, then it must be a fairly mild motor, compression /cam etc.
As stated above, I find it hard to believe you can make that hp/ci and idle at 750 with 8 degrees.
Nobody I know runs less than 16 at idle on anything that is warm, and most run in the 18-22 bracket, some with 10 degree start retards.
For a street/race car you would be doing well to get over 1.5hp/ci and still be "streetable".