Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help

Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Tech Help

Closed Thread
LinkBack Thread Tools Display Modes
Old 09-27-1999, 10:13 PM
Posts: n/a
My 500E exhaust is really hot - too hot to hold your hand in. Isn't all that heat supposed to go into making power and not out the tailpipe. Also there is a lot of carbon on the pipe outlets. What's the deal? Is this normal?

Old 09-28-1999, 10:09 AM
Posts: n/a
Welcome to the wonderful world of entropy! Here comes a thermodynamic lesson whether you wanted it or not.

Of the overall power generated by the combustion of the compressed fuel/air mixture in the combustion chamber of your car's engine, only about 25%-30% of it actually goes to the flywheel, driving your car's transmission/drive train/wheels. As you have already noticed, a large portion goes out the tailpipe as heated gases, a large portion is transferred to the engine coolant which then transfers it to the environment, and a large portion goes via radiant and convection heat transfer to heating up the air and the areas around the engine compartment. Unfortunately these are thermodynamic facts of life, and you can't do much better than that 25%-30% efficiency without taking extreme measures. Diesels are a little more efficient than spark-engines because their combustion temperature is higher.

If you hadn't guessed, yes I'm one of those engineer types.

Actually, your engine's exhaust temperature may indeed be too high, which may be a reason for concern, but if you're talking about the normal temperature of the gases leaving the tailpipe after running the car for a period of time, I would fully expect them to be too hot to hold you hand in.

Closed Thread


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Help... blowing hot air through vents JimVelca Tech Help 4 11-04-2002 03:55 PM
Hot Hot Hot cKoeller Vintage Mercedes Forum 11 09-03-2002 09:00 PM
Hot Hot Hot cKoeller Tech Help 0 09-01-2002 12:06 AM
How hot is too hot Mark B Tech Help 5 06-13-2000 02:58 PM
Hot Wheels cossie Featured Cars 2 06-09-2000 04:57 PM

All times are GMT -4. The time now is 09:49 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page