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Slow Warmup ?
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Posted 1/20/2007 3:35 PM
DUTCH
Administrator Doppelgänger




Date registered: Apr 2006
Location: US, GA, Atlanta
Vehicle(s): 2015 Audi Q7 3.0 TDI,2018 Sprinter
Posts: 9963
5000
Slow Warmup ?

Are diesels slower to warm up than gasoline engines? My new and still very tight OM642 engined ML320 CDI is extremely slow to warm up in comparison to my 60,000 mile old M113 engined G500. Is this normal?
#60061
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Author
Posted 1/20/2007 3:37 PM
BenzDieselTuner

Date registered: Dec 1899
Location:
Vehicle(s):
Re: Slow Warmup ?

mine takes a while to warm up, probably because of the cast iron motorblock.......this may be what you are experiencing....
#60062 - in reply to #60061
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Posted 1/21/2007 3:43 AM
ForcedInduction
Regular




Date registered: Sep 2006
Location: Federal Heights, CO
Vehicle(s): 1980 240D 3.0VNT
Posts: 89
50
RE: Slow Warmup ?

All modern diesels are like that (Ask anyone with a VW TDI). They are so efficient that they make very little heat at idle. If you just let it idle it will take forever to warm up and might not even reach operating temp in winter if left at idle.

 

I can let the GMC's at work (CAT engines) idle for an hour and they will not even reach 120*f. I can even let my engine idle for an hour and
it will barely pass 140*f.

#60111 - in reply to #60061
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Posted 1/22/2007 10:29 PM
lkchris
Veteran


Date registered: Nov 2006
Location: Albuquerque
Vehicle(s): '07 GL320CDI, '06 E320CDI
Posts: 144
100
RE: Slow Warmup ?

Unlike a gasoline engine which must run a 15-parts-air-to-one-part-fuel mixture at ALL speeds, the air/fuel ratio varies on a diesel in proportion to engine speed.

 

At idle, a diesel air/fuel ratio is something like 150-1, meaning it's hardly burning any fuel at all. Less fuel equals less heat.



Edited by lkchris 1/22/2007 10:30 PM
#60260 - in reply to #60111
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