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Misc Forums => NON LSR Posting => Topic started by: JustaRacer on December 12, 2012, 09:04:05 PM

Title: Methanol limits?
Post by: JustaRacer on December 12, 2012, 09:04:05 PM

How much boost can Methanol deal with?

Anyone ever get it to detonate when rich?

Title: Re: Methanol limits?
Post by: John Burk on December 12, 2012, 11:59:10 PM

The turbo Offys used to run 70 psi .

Title: Re: Methanol limits?
Post by: generatorshovel on December 13, 2012, 12:49:47 AM

I'm running 11.5 / 1 (static) with 12 lb boost, that ups the CR to about 17/1, I'm using  methanol,no sign of detonation,,yet
Tiny

Title: Re: Methanol limits?
Post by: Peter Jack on December 13, 2012, 01:34:47 AM

Quote from: John Burk on December 12, 2012, 11:59:10 PM

The turbo Offys used to run 70 psi .

We actually ran more than 70 psi in testing with a turbo Offy in 1979 without damage by shutting off the line from the plenum to the waste gate so it couldn't read the boost. The driver said he saw 90 psi.

Pete

Title: Re: Methanol limits?
Post by: John Burk on December 13, 2012, 01:51:05 AM

The Indy people jokingly refered to running their Offys at that high boost for 500 miles as semi-controlled combustion in a non-reusable container .

Title: Re: Methanol limits?
Post by: Peter Jack on December 13, 2012, 02:25:40 AM

As I remember the rules called for the waste gate to open at 65 psi and I actually thought that was pretty high.  :-o :-o :-o

Pete

Title: Re: Methanol limits?
Post by: Jon on December 13, 2012, 05:57:35 AM

How long is a piece of string?

Would depend a lot on compression ratio, charge cooling, ignition timing, yada yada yada....

70psi is pretty wild, what charge cooling were they running and inlet temperatures were the seeing?
jon

Title: Re: Methanol limits?
Post by: JustaRacer on December 13, 2012, 08:39:42 AM

Thanks!

 :cheers:

Title: Re: Methanol limits?
Post by: Peter Jack on December 13, 2012, 11:28:46 AM

There was no intercooling. The air went straight from the turbo into the intake. There may have been fuel put in before the turbo, I'll have to look at some old pictures and I don't have time right now. Alcohol tends to be really easy to work with. The main thing is getting it out of the system as soon as you're done.

Pete