Help! Fender is hot to touch! - Team Camaro Tech
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post #1 of 13 (permalink) Old Aug 22nd, 16, 04:23 PM Thread Starter
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Help! Fender is hot to touch!

This is really weird. I was finishing up breaking in the cam on my new crate engine. The engine was running at 2200 RPM for about 10 minutes. Within 5 minutes the passenger side fender got so hot I could not put my hand on it for longer than 2 seconds. I could feel hot air blowing that direction from the fan and radiator area. I am running headers and everything is brand new. I'm hoping this would not be an issue if I am driving down the road and air is cooling the fender and radiator but I have never seen or even heard of this before. I'm about to take the car to the paint shop in a week or two and I don't want the paint on the fender to get so hot that it bubbles or peels...

Tony
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post #2 of 13 (permalink) Old Aug 22nd, 16, 05:24 PM
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Re: Help! Fender is hot to touch!

Quote:
Originally Posted by bondora68 View Post
This is really weird. I was finishing up breaking in the cam on my new crate engine. The engine was running at 2200 RPM for about 10 minutes. Within 5 minutes the passenger side fender got so hot I could not put my hand on it for longer than 2 seconds. I could feel hot air blowing that direction from the fan and radiator area. I am running headers and everything is brand new. I'm hoping this would not be an issue if I am driving down the road and air is cooling the fender and radiator but I have never seen or even heard of this before. I'm about to take the car to the paint shop in a week or two and I don't want the paint on the fender to get so hot that it bubbles or peels...
Ideally you would use a large fan to direct air into the radiator and engine bay when doing something like that. At least I do. Same when I am charging AC etc.

It should be fine when you are going down the road.

Don

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post #3 of 13 (permalink) Old Aug 22nd, 16, 06:12 PM
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Re: Help! Fender is hot to touch!

Factor in the off timing if you just cranked up and ran by ear. 2200 rpm in 10 min sounds about right. Having headers the heat would tend to rise behind the fender aprons, unless you were running fender well exit. Pun intended.

Don
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post #4 of 13 (permalink) Old Aug 22nd, 16, 11:23 PM
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Is your battery grounded to the fender and not the engine block as it should be ?

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post #5 of 13 (permalink) Old Aug 23rd, 16, 04:32 AM
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Re: Help! Fender is hot to touch!

As suggested, fender is going to get hot with no ambient air moving from a fan in front of Camaro.
Headers are a great heat radiator, more so then cast iron manifolds.
Your temp gun will go to max reading and might get stuck there...

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post #6 of 13 (permalink) Old Aug 23rd, 16, 06:03 AM Thread Starter
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Re: Help! Fender is hot to touch!

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Originally Posted by TJS69 View Post
Is your battery grounded to the fender and not the engine block as it should be ?
No. I am grounded to the engine block. Do you have a picture of the fender ground that I should have? I thought the AIM showed a ground to the engine block...no?

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post #7 of 13 (permalink) Old Aug 23rd, 16, 06:18 AM
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Re: Help! Fender is hot to touch!

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Originally Posted by bondora68 View Post
No. I am grounded to the engine block. Do you have a picture of the fender ground that I should have? I thought the AIM showed a ground to the engine block...no?
It would take a huge amount of current to make a fender hot to the touch. Much more than your battery or alternator could produce. It would likely blow a hole in the fender at the point of contact long before the whole fender would be hot to touch.

Don
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post #8 of 13 (permalink) Old Aug 23rd, 16, 08:08 AM
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Re: Help! Fender is hot to touch!

I've seen headers get red-hot in that time frame on a dyno or the rollers for emissions testing. That would radiate a ton of heat but not to be able to hold your hand on the fender seems really beyond that.
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post #9 of 13 (permalink) Old Aug 23rd, 16, 08:21 AM
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Re: Help! Fender is hot to touch!

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That would radiate a ton of heat but not to be able to hold your hand on the fender seems really beyond that.
They do get hot. I remember when first design of ceramic coated headers came on market, the coating flaked off during camshaft break-in. Even the old Blackjack headers with plasma-spray alum.
No airflow and fender(s) gotten hot enough to literally fry an egg.
Watched a friend do this and his egg was cooked - both of them - the header set and the egg - solid yolk.

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post #10 of 13 (permalink) Old Aug 23rd, 16, 11:03 AM
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Re: Help! Fender is hot to touch!

Your battery should have a huge wire that gets grounded to the block and a pigtail that gets grounded to the fender right above the battery. You should have both.

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post #11 of 13 (permalink) Old Aug 23rd, 16, 04:23 PM
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Quote:
Originally Posted by bondora68 View Post
No. I am grounded to the engine block. Do you have a picture of the fender ground that I should have? I thought the AIM showed a ground to the engine block...no?
Grounding to the block IS correct. Sorry, if my wording was confusing.

69 Camaro -originally a LM1 car. 327, Edelbrock E-streets, hooker, DUI performance distributors, ultradyne cam, stewart, TRW etc. Vintage Air, AGR steering, Corbeau GTSII seats, 700R4 transmission, 12-bolt w/Eaton 4.11:1
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post #12 of 13 (permalink) Old Aug 23rd, 16, 04:53 PM
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Re: Help! Fender is hot to touch!

Seen red hot headers on cam break ins many time. Get the timing right and not so bad. Big fan at the radiator excellent idea.

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post #13 of 13 (permalink) Old Aug 23rd, 16, 06:42 PM Thread Starter
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Re: Help! Fender is hot to touch!

Quote:
Originally Posted by click View Post
Your battery should have a huge wire that gets grounded to the block and a pigtail that gets grounded to the fender right above the battery. You should have both.
Roger that!

Tony
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