[AT] Mixing High Octane gasoline and Diesel fuel

[Dean VP]

Gene:

Thanks for the tutorial.  I guess I got the facts mixed up or was given
incorrect data. If I have understood you properly, the bottom line is that
there is a possibility one could get more power using the right mix of
diesel fuel and 87 Octane gas in a low compression, long stroke engine. Then
whatever mix gets it down to the equivalent of 72 Octane gasoline would be
optimum? 

So then by implication, "ping" is caused by the fuel igniting too quickly in
a very high compression engine or too early when timed incorrectly in a
lower compression engine. Or both is possible I guess if the octane is too
low.  

Dean A. Van Peursem
Snohomish, WA 98290

I'm a walking storeroom of facts..... I've just lost the key to the
storeroom door 


www.deerelegacy.com

http://members.cox.net/classicweb/email.htm



-----Original Message-----
From: at-bounces at lists.antique-tractor.com
[mailto:at-bounces at lists.antique-tractor.com] On Behalf Of Gene Dotson
Sent: Tuesday, April 12, 2005 5:47 PM
To: Antique tractor email discussion group
Subject: Re: [AT] Mixing High Octane gasoline and Diesel fuel

    Dean;
    Actually your information is flawed. High octane gasoline
burns slower than lower octane. The additives slow down the burn
rate so it can be used in a high compression engine. Any engine
will develope the maximum power on the lowest octane fuel that
it can use without detonating. Diesel fuel will cause a spark
ignition to detonate if the compression pressure is high enough.
Diesel fuel mixed with gasoline would burn faster to make up for
the slower burn rate of the higher octane. Diesel fuel with a
high cetane rating burns faster than fuel with a low cetane
rating. Diesel fuel contains more BTU's per gallon than
gasoline, so it makes sense that the faster burn rate of diesel
and higher BTU's would offset the slower burning high octane
gasoline and result in more power
    Or you can just use the cheapest and lowest octane in your
tractors and still have more power.
    Using a higher octane than required in low compression
engines results in a burn rate that is often so slow that the
fire is still burning when the exhaust valve opens and will burn
out the valve and seat.
    You Never, never, NEVER gain power by using a higher octane
fuel than the engine requirws.

                    Gene



----- Original Message -----
From: "Dean VP" <deanvp at att.net>
To: <at at lists.antique-tractor.com>; "AT JD"
<antique-johndeere at lists.antique-tractor.com>
Sent: Tuesday, April 12, 2005 7:35 PM
Subject: [AT] Mixing High Octane gasoline and Diesel fuel


: I was informed of a way to get more performance out of our
lower compression
: engines that were designed to run on lower octane gasoline.
The theory
: explained to me was that the current high octane gasoline
burns too fast to
: get full performance from our low compression, long stroke
engines. It was
: stated that a 25% to 35% diesel fuel mixed with gas would
produce a slower
: burn rate (lower octane) offering more power and torque.
Intuitively, this
: theory makes some sense to me.
:
: Anyone with first hand experience trying this? Sure would
solve the top end
: lubrication issue. But ... with the downside of some potential
Pre-ignition
: knock. Then add some water???  :-)
:
: Dean A. Van Peursem
: Snohomish, WA 98290
:
: I'm a walking storeroom of facts..... I've just lost the key
to the
: storeroom door
:
:
: www.deerelegacy.com
:
: http://members.cox.net/classicweb/email.htm
:
:
:
:
:
: _______________________________________________
: AT mailing list
: http://www.antique-tractor.com/mailman/listinfo/at
:

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