100 ll
 

Has anyone mixed 100ll av gas with 93 octane what are the pros and cons

Ran it 10 gallon 100LL to 20 gallon 91 premium a couple seasons ago on an iron head sbc with too much static compression and too small of a cam. Ran well, good fuel, too expensive. Rebuilt engine with different pistons, heads, and slightly larger cam so I can run straight 91 very comfortably. Never had to buy marina fuel with that engine but I kept a timing light on board just in case so I could back off the ignition timing.

the only cons are availability and price (although local to me its 3.89/gal which is a bargain for what the fuel is).

It does not rot out lines like others like to say.......mixing it with 93 would be a good insurance policy if you are on the edge of 93

As with any fuel.........use it within its limitations and tune to it and it will work well.

Go on yellowbullet.com and search for user name "yeti" and avgas or 100LL......be prepared to read awhile.

Its great fuel and priced rite I herd its closer to 104 octane.

Id have to look in some interpolation tables I have for it...but yes 104 oct in a R+M/2 rating is a slightly conservative number if I remember right.

The "100" comes from the lean mixture rating in an aircraft fuel test.

So you guy's are getting this without or before they mix it with anti icing stuff, or do they still do that, I use to run it in a drag car years ago.

I dont believe there is a "before or after anti icing mix"

https://www.cgabusinessdesk.com/document/aviation_tech_review.pdf

Pg 55 (or 59) of the above document specifies that 100LL has a maximum freezing temp of -59* C depending on the test procedure.

If there is an additional "arctic mix" or something of that nature I do not know....but I doubt it due to the standardization laws behind it.

I run it exclusively in my "69 Tahiti jet. 427 with 12.5:1. I do however add one quart transmission fluid to every 15 gallons of 100 LL to help top end lubrication.

Is it a 2 stroke Rat motor.......:D

Aren't we the clever one today????...................that was actually pretty funny.