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  #16  
Old 08-10-2010, 02:06 PM
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Join Date: May 2009
Location: The slums of Beverly Hills
Posts: 4,982
Quote:
Originally Posted by lkchris View Post
You're laughing in ignorance again.
ORLY? Why don't you enlighten us why a hot engine bay makes the engine more efficient?
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Originally Posted by mak View Post
my 89 300se Euro had tremendous amount of heat soak after shut-down. this would lead to stuttering re- starts for a few seconds. problem resolved by installing a exhaust heat wrap .The under hood temperature has dropped dramatically. Amazing difference in hot starts too.
mak
Bingo. A heat shield makes a big difference on these cars. My only concern with exhaust wrap is that I've seen it cause cast manifolds to crack on occasion. I'm plotting an aluminum cover.
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tits = worse & worst.
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  #17  
Old 08-12-2010, 02:51 PM
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Join Date: Jun 1999
Location: Albuquerque, NM USA
Posts: 1,946
Quote:
Originally Posted by tjts1 View Post
ORLY? Why don't you enlighten us why a hot engine bay makes the engine more efficient?
Ok, how about this from BMW:

Quote:
Electronically controlled engine cooling - sometimes called "map" cooing - controls the engine thermostat in response to engine speed, engine load and outside temperature, rather than just coolant temperature. This allows the engine to operate at higher temperatures under light-load conditions, which can increase fuel economy and benefit heater effectiveness.
You maybe weren't around in the 1970s when all the Detroit iron mongers switched to 190 degree thermostats--that was done in the interest of emissions and fuel economy, too.

Current Mercedes engines feature electronic engine cooling thermostats, too. Mercedes has done it a bit better than BMW, as there's no "replace water pump/thermostat/overflow tank/radiator/hoses every 60K miles" recommendation as there is for BMWs. That heat is tough on the plastic.

You understand that the engine bay is hotter because the engine is running hotter?
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'07 GL320CDI, '06 SLK350
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