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Overheating Diesels?

Old 03-23-2006, 10:02 AM
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Default Overheating Diesels?

I was reading a review on a diesel MVVS 2.5 engine that stated it was relatively tolerant of overheating. My questions is how do you know if the engine is overheating? There was no mention of cylinder head or exhuast gas temps. What signs to look for?

Greg

Old 03-23-2006, 04:58 PM
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Default RE: Overheating Diesels?

I have lots of diesels ave not seen any overheat thing I did reach 235 degrees at head cylinder junction on one, I would imagine you could do it by severe overcompression or lack of cooling air in a cowl , most of mine you can touch you hand on the muffler for a short time and on some hold it (DO NOT DO THIS ON A GLOW ENGINE YO WILL GET A NASTY BURN) In reality you sometimes have a problem keeping it warm enough sometimes at low speeds. You can hold you hand in the exhaust, I do this all the time to make sure
oil is coming out its only warm. If your fuel is wrong low ether, and over compressed it might get hot martin

if you look in the exhaust stack of a glow enine no muffler you will see a blue flame none in a diesel
Old 03-23-2006, 08:32 PM
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Default RE: Overheating Diesels?

If you had too much IPN (MEKP,Amylnitrate to example) in fuel, the engine will be overheated.

Jens Eirik
Old 03-23-2006, 09:53 PM
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Default RE: Overheating Diesels?

Ok, the DII makes sense. The review was for sport team race use, so cooling was probably an issue too. In normal use overheating shouldn't be a problem.

Greg
Old 03-23-2006, 10:03 PM
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Default RE: Overheating Diesels?

Greg, there is a difference in the way the engine heat is distributed over the engine, my Fox .74 for example runs on glow with the crankcase almost cool and the cylinder hot. On Diesel it runs the same temperature all over, I can only assume that this is because there is no methanol evaporating in the crankcase. It does not run hot though.
Old 03-23-2006, 10:29 PM
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Default RE: Overheating Diesels?

My MVVS 2.5 did run very hot for about the first gallon
and then quite suddenly began to behave.Probably if I
had run the 40% ether like they reccomend it would not
have exhibited the over heating during break in period.
I have one that is nib and will try it like the factory says
and get back.
Ralph
Old 03-24-2006, 12:11 AM
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Default RE: Overheating Diesels?


ORIGINAL: mylamo

My MVVS 2.5 did run very hot for about the first gallon
and then quite suddenly began to behave.Ralph
The new engine can have the piston tight in the sleeve first time the engine are in running-in period and get hot of friction. Later the piston are perfect fitted in the sleeve, the engine will not longer be hot.

Jens Eirik
Old 03-24-2006, 09:24 AM
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Default RE: Overheating Diesels?

MVVS makes excellent engines.

As for break-in, ever since I came upon this site I have broken-in my diesels as they recommend:

http://www3.bc.sympatico.ca/dieselcombat/index.htm

George

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