40C All fuel running on 75% diesel

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dtoots1
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Re: 40C All fuel running on 75% diesel

Post by dtoots1 » Sat Jan 08, 2022 8:48 am

My info came from the johnnypopper site...like most of stuff on internet i cannot find the exact page again, once i got off it. it is interesting to see this as usually diesel runs on higher compression

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Lavoy
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Re: 40C All fuel running on 75% diesel

Post by Lavoy » Sat Jan 08, 2022 10:00 am

A diesel engine is higher compression because they are a compression ignition engine, and the fuel is injected into the cylinder at the correct time. On a spark ignition engine, diesel or kerosene or white gas will pre-detonate just terrible, so they lower the compression to compensate.
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Parts and restoration for antique and late model John Deere crawlers.
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dtoots1
350 crawler
350 crawler
Posts: 975
Joined: Fri Nov 30, 2012 8:54 am
Location: akron, ohio

Re: 40C All fuel running on 75% diesel

Post by dtoots1 » Sat Jan 08, 2022 10:25 am

Yeah, have had a few gas jobs that did that!!!!

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Lavoy
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Re: 40C All fuel running on 75% diesel

Post by Lavoy » Sat Jan 08, 2022 10:38 am

Put half a tank of #1 fuel in my 64 Impala one time. Smoked and pinged like a bastard.
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Parts and restoration for antique and late model John Deere crawlers.
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Stan Disbrow
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Re: 40C All fuel running on 75% diesel

Post by Stan Disbrow » Sun Jan 09, 2022 6:07 am

Hi,

The way distillate combusts is that the lighter fraction will burn first. So the spark ignites and burns all the gas, which makes heat which burns the kero which makes heat to burn the diesel. The lower compression allows for this rather than it all trying to burn at one time, which will knock and ping and so on.

But this method also takes time. So a slow revving engine is also required. And so we have exactly that. Cars beginning in the 50s were all into horsepower, so higher compression and higher RPMs and such and only want gas. They don't like diesel or even kero in their tanks. Heck, cars got so much compression they needed lead in the gas to keep even that from detonating. Just the same as aero engines during the war.

Stan
There's No Such Thing As A Cheap Crawler!

Have: '58 JD 420c 5-roller w/62 inside manual blade
Have: '78 JD350C w/6310 outside manual blade
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