Fevre

Confirms my belief my coated vette headers are way cooler in temp and looks than the high temp painted headers on my Formula. Might have to get the Formula headers coated to get the under hood temp down.

Judge for yourself:

http://www.carcraft.com/techarticles/80038/


Abridged version for you lazy guys: :)




[Modified by Fevre, 9:55 AM 7/18/2003]

Fevre

Just noticing the power drop for the coated version. This test was open air eng dyno, not in a car so you may gain back some the hp/torq by having cooler temps under the hood under real life conditions. Would like to see that test.

Monty

I can definitely attest to the effectiveness of the ceramic coatings. My headers, turbines and downpipes are all coated and I have had no ill effects from the heat. My downpipe right off theturbine runs within an 1" or so of the inner fibergalss fender and the paint on it looks like new. The turbine, which can reach temps of 1200F is about 2-3" below the hood and the paint ounder the hood is unaffected at all. Even after hours of contiunois driving the engine compartment temps don't seem any higher than with any other engine setup.

I am surprised at the loss in power and torque the article indicates though. Most coating companies claim a perfromance inscrease since the exhuast gas temp is kept inside the header resulting in higher gas velocities and inproved scavenging.

gkull

Where I live in the southwest US is virtually rust free. I just had these 12 year old Hooker super comp 1 3/4 headers recoated when I had to put in a new cam and motor refresh 2 months ago.

Fevre

Not chrome but they still do look nice! Mine have a little discoloration and few scratches :mad but all and all they are still pretty nice.

George, what header gaskets are you using? I just installed aset of these and they work great plus the you can order new inserts instead of whole gasket.



http://store.summitracing.com/partde...57#largerimage

theandies

Jet-Hot actually sent me a reprint of that article among others about their product. They also sent a videotape and other stuff when I enquired about getting mine done. Some of us have a group purchase in the works and if anyone is interested I can e-mail you the information since the Forum is not going to help us on this one. I guess if you want something done you have to do it yourself. :D


[Modified by theandies, 11:06 AM 7/18/2003]

gkull

My head exhaust ports are so large that i have to run a "D" shaped Felpro 1406 slightly trimmed so it doesn't cover any of the opening.

I also use ARP studs in the heads. It makes it really easy to install or remove the headers and gaskets. I like the Felpro because they never blow out.

Fevre

The gasket material can be trimmmed to fit but not sure if there is enough there for your needs. The outside of the flanges on the dynomax headers I have are not very rigid and slightly bent in so a regular gasket leaked terrible but seal great with these gaskets.

theandies

Check this out:



Notice my aircraft Safetywire :yesnod:
On aircraft we have drilled head bolts and we safetywire them together so that the bolts pull on each other. The Stainless Steel wire is really hard to break. These bolts will never back out.......the most common cause of header gasket leakage, which leads to gasket failure. I highly recommend it. It is fast to do and not as cumbersome as those special header bolts IMO.

EDIT- BTW those are the Headman ZZ4 "D" Port Headers I am getting coated. :thumbs: They don't look like that anymore. :nonod:


[Modified by theandies, 7:11 PM 7/18/2003]

427V8

:crazy:Um look again, those number show the power loss is on the painted side (a) not the coated side (b) :crazy:

MotorHead

That safety wire id cool never seen that can explain how to do that ?

Here's mine , it's hard to believe a 300 degree drop in temperature but that's cool,
I got mine coated mainly for the looks but I'll take the temp drop I was thinking in the order of 20 - 50 but 300 degrees :eek:







[Modified by MotorHead, 7:46 PM 7/18/2003]

Fevre

Keith

The "B" column is the coated header and the power is slightly down in 5 out of 8 categories from the painted header. Peak HP is up slightly while ave hp is down.


[Modified by Fevre, 10:55 PM 7/18/2003]

adam

Neat story...

I got one of those infra-red temperature probes for christmas.
Was running all over the place scanning temperatures (walls,
ceilings, etc.)

I also checked my exhaust manifold temps - to see if they were
even or some very how (and lean.) I got temps of around 350 deg.
This is for the 81 tube exhaust manifolds. The temps could differ
by 50 degrees. I think one was close to 400...

Anyone else try this?

71coupe

Gkull - those look nice :yesnod:

Theandies - is that .032" or just .025" wire? (Only kids use .025)
Where do you work, anyway? Can you get me a job?


[Modified by 71coupe, 11:42 PM 7/18/2003]

427V8

:bb