leaded fuel-NASCAR

[John D.]

In our local newspaper this past week there was an article that stated that Sunoco provides leaded racing fuel for NASCAR. Not available for public use. It's a shame we can't buy some for our old Corvettes though. Any of you able to procure this blend??? THanks, John Clem did you see this article?

[Dick W.]

Re: leaded fuel-NASCAR

I believe that they switched to unleaded this year, at least for a few races John

[William C.]

Re: leaded fuel-NASCAR

Leaded fuel available about 10 miles from my house, up to 114 octane, I don't know the cost, sold to roundy-roundy racers around here...

[John D.]

Re: leaded fuel-NASCAR

Dickie, I do believe I heard the announcers say that earlier in the season. They said they were worried about early engine failure though. I like to use 100 low lead myself but it's hard on the o'rings and seals. SO the solution is to use viton stuff. Thanks, John

[John D.]

Re: leaded fuel-NASCAR

Bill, That stuff should make the old BB's run for sure. Are you coming to our Pittsburgh Chapter show on June 10th? Thanks, John

[Dick W.]

Re: leaded fuel-NASCAR

Clup, the going rate for the good stuff starts North of $6.00 a gallon

[Rob Dame]

Re: leaded fuel-NASCAR

110 leaded octane sold 2 miles from the house $5.499 per gal. Same deal, there is a 5/8 mile track 1 mile from the house. The lead sure keeps the pipes nice and gray an the exhaust smelling good. I treat The Heap to it once in a while...wakes the ole plug up

[Ken B.]

Re: leaded fuel-NASCAR

I live in Buffalo and there is a station about 5 miles from me....7.52 a gallon...But it sure makes the motor purr...

[Donald M.]

Re: leaded fuel-NASCAR

I can buy Phillips 66 110 leaded about a mile from me at a Citgo station.There is a roundy-round up the street a bit. The latest rip-off price is $6.99/gal.! I run about a 50/50 mix once in awhile just to experience the smoother idle, cleaner pipes, faster starting and sweet smell. The local Sunoco also sells 110 leaded but they won't allow you to pump it directly into you car. You have to pump it into a gas can (not worth the hassle)! Legalities due to "off road use only" labeling on the pump.

[Duke W.]

Re: leaded fuel-NASCAR

I believe the switch to unnleaded fuel is complete and a done deal, and the blend is somewhere near 100 PON - same as commercially available unleaded race gas - which is less that the 110+ PON leaded fuel they used before, so they might have to drop CRs a bit on both restrictor plate and unrestricted engines, but the power loss will only be 1-2 percent - about the same as the difference in power at 90 degrees inlet air temperature compared to 70-80.

Some press reports have made references to various engine maladies blamed on unleaded fuel, none of which make too much sense unless they were a "cover" for just detonating an engine to death due to too high CR.

Beyond having to drop CRs slightly, the valve seats will no longer benefit from the insulating properties of lead oxide deposits as they did with leaded fuel. This can be compensated by induction hardening the seats and/or doing a little work on the valve closing dynamics like GM did on the LT-1 camshaft.

Slamming the valves into the seats at even the mild clearance ramp velocities used on OE cams means they're hitting the seats nearly 50 percent faster at 9500 than at 6500. It's a real art to design a pushrod valvetrain that will live at this speed. It gets down to a very low level of engineering detail and those who figure it out aren't going to give up the "secret".

Duke

[Clem Z.]

Re: leaded fuel-NASCAR

NASCAR has switched to no-lead racing gasoline for all racing. they used no-lead last year in busch. this stuff make more HP than leaded because of the chemicals used to make it. you must keep it in a light proof container because it is light sensitive.

[Clem Z.]

the no lead cause some valve guide problem

because the lead acted like a lubricant for the valve stems and guides

[Joe L.]

Re: leaded fuel-NASCAR

clem-----

I also heard that all NASCAR races this year used unleaded fuel except Daytona. In fact, I wondered why it would have been any different for Daytona.

The late John Lingenfelter once said that the best thing that ever happened for performance was unleaded fuel.

[Duke W.]

Just add a little Marvel Mystery Oil ...

...maybe not... it's probably illegal.

Did you ever heard what the "mystery liquid" was in the Toyota manifolds at Daytona? Maybe a little TEL supply? Maybe it was Marvel Mystery Oil!

Duke

[Joe L.]

Re: Just add a little Marvel Mystery Oil ...

Duke-----

Marvel Mystery Oil is still sold. I saw some on the shelf of a major auto parts chain not too long ago and I was surprised that stuff was still around.