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-   -   Manifold temps. Anybody know? (http://www.diychatroom.com/f46/manifold-temps-anybody-know-183527/)

noquacks 07-12-2013 04:33 PM

Manifold temps. Anybody know?
 
People,

Im trying to find out whats the typical temp of an engine manifold. Would headers matter? Im thinking about 1000-1100 deg F. Advice/opinions/evidence appreciated.

Oso954 07-12-2013 05:05 PM

Anything between 400 and 1200 could be typical, and specialized engines (eg.high performance racing engines) would be even higher.

What engine, what fuel, is it turbocharged, how much power is it/has it been producing, is the mixture standard, rich, or lean, and other factors can affect what would be "typical".

noquacks 07-12-2013 06:29 PM

400? seems too cold. I really dont think the temps vary so much as you say. What car would run as cold as that, Oso?

Im talking about the typical 4-8 cylinder out of "detroit" meaning, everywhere else. No modifications. As you said- "standard". Gasoline internal combustion engine.

Your post is helpful. You offer a top of 1200 for standard. Im happy with a max of 1200. If thats the consensus.

Thaks

Oso954 07-13-2013 12:01 AM

Quote:

I really dont think the temps vary so much as you say.
So, you believe that a given vehicle has the same exhaust manifold temp whether it is idling, cruising slowly around a neighborhood at 25 mph, cruising down the freeway at 65, or hauling a trailer up Pikes Peak ????

The manifold temperature will vary depending on how much power the vehicle has been producing.

If you don't like the number 400, just consider it to say that sub 500 degree temps are possible.

Quote:

You offer a top of 1200 for standard.
I never used the word "standard". That 1200 degree temperature would be very unlikely in a non turbo 4-8 cylinder gas engine. It is more liable to be a turbo diesel that is working hard(eg pickup pulling heavy load up hill)

gregzoll 07-13-2013 12:08 AM

Basically it is hot enough to cook supper in the engine compartment, if you were to wrap say brats and Kraut in foil, or hamburger and mixed veggies, or any campfire recipe on top of it, or in the compartment, lets just put it that way.

Average is around 500-1000, but higher if you have turbo.

Fix'n it 07-13-2013 08:24 AM

are you asking because you want to know if BBQ paint will work ?

noquacks 07-13-2013 11:10 AM

What Im getting at, Oso and other fellow members, is (I shoulda clarified earlier) the typical MAX temp on a stock car, non tirbo, I guess. No mods, no climbing up Mt Etna once in a lifetime, normal running, etc. The below 1200 seems credible. But 500 , I dunno- too cold, not that it would be worse, the cooler the beter. I'll tell you why Im curious, its cuz.........

ukrkoz 07-14-2013 05:10 PM

Google?
http://www.youtube.com/watch?v=-2PAE8-iMNs

BigJim 07-14-2013 07:33 PM

A loaded dump truck pulling a steep grade will produce enough heat to make cast iron exhaust manifolds glow bright cherry red.

noquacks 07-15-2013 03:57 PM

Quote:

Originally Posted by BigJim (Post 1215949)
A loaded dump truck pulling a steep grade will produce enough heat to make cast iron exhaust manifolds glow bright cherry red.

I heard. That could be about, way over 1200, I figure...

noquacks 07-15-2013 03:58 PM

I think Im happy with the replies here, in conclusion. Yous helped. My car shoyuld not blow up if my ac refrigerant escapes.


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