SS409

I would like to mix this with the 91 octane 10% ethanol blend here in So Ca. Two gallons mixed with 15 gallons of 91 should net out at around 93.
Is there any reason why I shouldn't mix leaded gas with the ethanol blend? This would be for a 66 327/350hp L79 with 11 to 1 compression. Thanks

Mike Ward

Why? Are you experiencing detonation?

SS409

Yes, the previous owner decided to keep the 11 to 1 compression.
I've been using NOS racing formula octane booster with good results but I don't care for the buildup on my spark plugs, cylinders and valves that the MMT is creating.

I don't think the leaded fuel would be a problem but I'm very familiar with murphy's law.

ghostrider20

The NOS octane booster is worthless in all regards.

Mixing fuels as you plan is fine, will mix as well as pouring two buckets of water together.

I am running the factory compression, maybe a tad more and have good results on 92 octane in all but the hottest of days in the summer.

I have and do spike with 100LL avgas. Mixed 50/50 with 92 octane yields 96 octane. 25/75 will yield 94 octane.

- Mark

DZAUTO

There is a race gas distributor in Okla City. I frequentlyy fill the 56 with 110 leaded. It loves it, I love it, it smells great, runs great.

cv67

As said that stuff is garbage. When it says it raises it 3 4 points or whatever it really means from 91 to 91.3

Been using this it works real well and they will ship to Ca.
Run 11.5:1 on the street never pings. On 91 octane 34 deg was pushing it run closer to 40 now with this.

I dont drive it much so 1 six pack goes a looong ways.

http://www.wildbillscorvette.com/OctaneSupreme01.htm


Of course good race gas probably better (mixing it)

SS409

Well that answers my question about mixing lead and ethanol, thanks...

SS409

This stuff sounds interesting. I may give it a try. Thanks for all your help guys....

SS409

Tom, that's one expensive fill up 110 here is 10.00 a gallon. It must be nice to have money to burn, literally.

DZAUTO

The 56 is NOT, repeat, NOT a daily driver. The price for 110 leaded here is about $7/gal now. When I feel extravagant, the 56 gets a healthy dose of 110.
At other times, I use 91octane NON-ethanol, which is quite common around here.

wmf62

every once in a while i used to mix 2 gallons 112 leaded non-ethanol with 13 gallons of 93 unleaded ethanol in my 62 when i was running the rochester injected LT1.

the engine loved it, no percolation problems on the hottest summer day; and it smelled sooooo good..

but, too expensive to run on a routine basis.
Bill

SLWRNU

Being in Kaaaalifornia you do know that since you've used the word "lead" that you are now on the official state watch as being an enviromental scofflaw.
Keep looking over your shoulder my friend.

ohiovet

I use 93 octane (Shell brand) with ethanol in my original 1962 340 HP 327 which has a 11.25 to 1 compression ratio.
No detonation or any other fuel related problems.

The Shell dealer tells me that the fuel usually has up to 10% ethanol but the wonderful state of Ohio does not require that the ethanol content to be disclosed on the pump.

burtonbl103

I run the 110 LL in my fuelie. It loves it.
Some time is will mix 2 gallons of 93 sunocco to 5 gal of the ll

MikeM

If the engine has been blueprinted to get an actual 11-1, you MIGHT have a problem with it. If the heads/block have been just slightly surfaced and used stock compression height pistons in it, you won't have that much compression.

Before I spent money on expensive fuel, I'd check the spark curve and see what it yields. If it meets factory spec I wouldn't think you'd have a problem running 91 octane gasoline at all. But, I've never run any California 91 so don't really know.

In the meantime, my two engines that are similar to yours run fine on 89octane E 10 but they don't have aggresive spark curves in them.

Mike Ward

If the NOS octane booster (a known placebo) is curing the problem, I think the solution is obvious.

wmf62

and that is???? the engine is psychosomatic?
Bill

Mike Ward

No, not the engine.

ohiovet

I have used 100LL in my 57 fuelie but after changing to Shell 93 I find it runs fine and starts hot and cold with no problems.
It is a 4360 unit which I have been told won't run good regardless of the fuel but Bob Williams of Sidney, Ohio has tuned it perfectly.

MikeM

That is Shell 93 E 10? Correct?