<VV> Engine KNOCK

Hugo Miller Hugo at aruncoaches.co.uk
Mon Aug 20 23:32:01 EDT 2018

I bought a Corvette with twenty year old gas in the tank. There was a layer 
of gum in the bottom of the tank, which I got rid of by pouring in fresh 
gas, sloshing it around then pumping back out, into various bowls & other 
receptacles. When I got clean fresh gas instead of the gummy stuff coming 
out I filled it with fresh gas once more & it ran absolutely fine.
I probably poured in and syphoned out about five gallons of gas before it 
came out clean. I let the old gas in the bowls settle, so all the gum & 
varnish sank to the bottom. I syphoned off the clean but ancient gas out of 
the bowls and into cans and used it a bit at a time by adding a bit every 
time I filled any of my vehicles with gas. The gum that settled on the 
bottom of the bowls I just wiped up with paper towels. Evil, nasty stuff it 
is. Sticks to everything and has an odor that sticks in your nostrils. But 
it's gone!
The whole process was a lot easier than I thought it would be.

-----Original Message----- 
From: FrankDuVal via VirtualVairs
Sent: Tuesday, August 21, 2018 3:57 AM
To: virtualvairs at corvair.org
Subject: Re:  Engine KNOCK

WWAAAAAAAAYYYYYYYYY down, like towards Kerosene or less..........
Unless it goes to syrup first then shellac.

Be careful "blending" this crap with the gas in a daily driver tank. I
once used too much of the foul stuff and stuck all the intake valves on
the left head of my Corvair work van. Had to dump carbs, empty tank, use
solvent on intake valve stems and a small (8 oz) hammer...... Aaaarrrgggg.

But burning it in a vehicle was the only legal way for me to dispose of
the stuff. Hauler of my paint waste wanted nothing to do with it.

Frank DuVal

On 8/20/2018 6:11 PM, Michael Kovacs via VirtualVairs wrote:
>   Seems like I forgot to post the solution to the '69 beater knock 
> (detonation) problem. After trying all else, cleaning cylinder fins, new 
> spark plugs, wires, and oil cooler checking to solve the problem, I 
> decided to try the thing I thought of first.
>   I took 9 gallons of 2 year old gasoline (with Stabil ) out of the tank 
> and put 9 gallons of 93 octane in. Problem solved. The engine always ran 
> fine on 87-89??
>   Guess the octane rating goes down when stored too long?  Thanks for all 
> the advice.

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