An idea for added airflow in 1FZ engine

[Ebag333]

Second, it helps to dissipate the heat generated by the exhaust gases. Wrapping might help to protect external components located along the exhaust path, but could wreck havoc with the various systems tied to the exhaust. The exhaust manifold should receive all the relatively cooler air it can get.

I'm not sure what system it could "wreck [sic] havoc" with.


The cats will most likely benefit or have no change from being a few degrees hotter. If we were talking a 40+ degree difference then there may be concerns about damaging them, but wrapping the exhaust is unlikely to cause that big of a difference in temps.

The only other thing is the O2 sensors, and several people have mounted those (on their 93/94's) in the PAIR location, which moves them upstream into hotter temps, with no apparent ill effects. You might knock 10-20k miles off the life of them....but considering that people are replacing O2's at 100-150k (or even higher) for minimal to no gain, it's unlikely that it'll make a significant difference.


On the other hand, all that heat can wreak havoc on all sorts of fun stuff in the engine compartment. Wiring harnesses, hoses, electronics....all those and more are potential failure points due to heat.

So by wrapping the pipes you may increase your chance of cat or O2 sensor failure (unlikely), but in either situation it will have exactly zero impact on being able to drive the truck. Might affect your mileage, but that's likely the extent of the failure.

Not wrapping the pipes could cause (potentially) failure in wiring harnesses or hoses (the two common trouble points), and those certainly can affect the way the truck runs, even to the point where it can no longer be driven, or driving it runs the risk of even more serious engine damage/failure.



All that being said from my research wrapping the pipes is not a good choice. Most wraps don't hold up, many can soak up flammable liquids (oil, grease, gas), and many can fail (IE: falling apart from water). Additionally they can trap water against the exhaust manifold and promote rust.

The better choice is clearly to ceramic coat the exhaust manifold. It provides all the benefits of wrapping with none of the downsides......except for cost, which can be fairly high (compared to wrap).

(A linkie for those interested in ceramic coating. The company in question makes some interesting claims: http://www.highperformancepontiac.com/tech/hppp_0810_ceramic_coated_finish/index.html )

 

[NLXTACY]

Andrews Powder Coating is just down the street from me. They do ceramic coatings as well as every other coating under the sun. I will find out in the morning what the cost would be to ceramic coat the exhaust manifold.

 

[NLXTACY]

Just got off the phone with Scott Andrews of Andrews Powder Coating. Really nice guy and willing to go into detail with anything you need/want to know. But the run down is:

• To ceramic coat the outside AND inside (of the exhaust manifold) is $240.
• This will result in a silvery finish.
• If you want black, its an addition $30.
• The total turn around is one week!
• 20% reduction of manifold heat NOT 20% reduction of underhood temps.
• "Amazing" quickness in cool down after engine shut off.

 

[Ebag333]

Just got off the phone with Scott Andrews of Andrews Powder Coating. Really nice guy and willing to go into detail with anything you need/want to know. But the run down is:

• To ceramic coat the outside AND inside (of the exhaust manifold) is $240.
• This will result in a silvery finish.
• If you want black, its an addition $30.
• The total turn around is one week!
• 20% reduction of manifold heat NOT 20% reduction of underhood temps.
• "Amazing" quickness in cool down after engine shut off.

Odd that the black is more expensive than the silver.

That's not a bad price at all. I wonder if he'd be interested in a group buy?

 

[NLXTACY]

Black is more because its another process they have to do to it on top of the silver. Oh there is no reason why he wouldn't be interested in a group buy. Especially since they all get treated the same and all get cooked in one huge oven. I will call him and see what I can get him to do.

 

[fjfar80]

Might want to talk and/or look into Jet-Hot. I just had the header for my E28 M5 treated by Jet-Hot...planning on doing the same for the Land Cruiser manifold...

 

[turbocruiser]

Just as another data point, my entire exhaust system is silver ceramic coated and my experience is that all the above claims are true, I'm a little less than convinced in the "amazing quickness of cooling on shutdown" because the block and head and everything else is simply dissipating so much heat it is hard to tell unless maybe he's measured the difference? Anyways, I've had zero problems with rusting, chipping or cracking, it definitely does keep much more of the heat in the exhaust tubing which helps with turbos in particular and emissions in general, it radiates much less heat to the floorboards above and to surfaces all around, I think that it actually repels mud better than a non-coated exhaust. Good stuff.

 

[NLXTACY]

BTW I am now considering doing my exhaust manifold AND the air filter canister in the ceramic coating OR should I stick with the thermal wrap for the canister?

 

[Ebag333]

BTW I am now considering doing my exhaust manifold AND the air filter canister in the ceramic coating OR should I stick with the thermal wrap for the canister?

Go for the bling bling.

 

[NLXTACY]

Go for the bling bling.

Well bling would be the side benefit.

 

[voorland80]

I'm not sure what system it could "wreck [sic] havoc" with.


The cats will most likely benefit or have no change from being a few degrees hotter. If we were talking a 40+ degree difference then there may be concerns about damaging them, but wrapping the exhaust is unlikely to cause that big of a difference in temps.

The only other thing is the O2 sensors, and several people have mounted those (on their 93/94's) in the PAIR location, which moves them upstream into hotter temps, with no apparent ill effects. You might knock 10-20k miles off the life of them....but considering that people are replacing O2's at 100-150k (or even higher) for minimal to no gain, it's unlikely that it'll make a significant difference.


On the other hand, all that heat can wreak havoc on all sorts of fun stuff in the engine compartment. Wiring harnesses, hoses, electronics....all those and more are potential failure points due to heat.

So by wrapping the pipes you may increase your chance of cat or O2 sensor failure (unlikely), but in either situation it will have exactly zero impact on being able to drive the truck. Might affect your mileage, but that's likely the extent of the failure.

Not wrapping the pipes could cause (potentially) failure in wiring harnesses or hoses (the two common trouble points), and those certainly can affect the way the truck runs, even to the point where it can no longer be driven, or driving it runs the risk of even more serious engine damage/failure.



All that being said from my research wrapping the pipes is not a good choice. Most wraps don't hold up, many can soak up flammable liquids (oil, grease, gas), and many can fail (IE: falling apart from water). Additionally they can trap water against the exhaust manifold and promote rust.

The better choice is clearly to ceramic coat the exhaust manifold. It provides all the benefits of wrapping with none of the downsides......except for cost, which can be fairly high (compared to wrap).

(A linkie for those interested in ceramic coating. The company in question makes some interesting claims: Ceramic Coat Finish - High Performance Pontiac Magazine )

yeah, you're right. I neglected to mention coatings; "wreck havoc" not the best way to say it. I should just have stated that wriapping can create more probs. thanks

 

[NLXTACY]

ok update on a group buy for the ceramic coatings. I will start a new thread.