go with HPC for the best results (IMO) They have been around for 22 years and do coatings for f1, cart, winston cup, aircraft industry, military, and has been used by the winners of:

13 - Indy 500 wins
14 - Daytona 500 wins
2 - IRL Championships
5 - 24 Hours of LeMans wins
9 - 24 Hours of Daytona wins
8 - NHRA Top Fuel World Championships
5 - NHRA Top Fuel Funny Car World Championships
17 - NHRA Pro Stock World Championships
14 - NHRA Pro Stock Bike World Championships

 

actually.. very impressive. hmmm. I'm still trying to figure out the logistics of even getting it done... (on a side note... since I seem to not be getting far here, anyone else's rotors warp?)

 

mid-day bump for you at-work-know-it-alls!

 

Clearly very blessed

Swain and Jet hot seem to disagree considerably- particularly on coating the inside, swain does not, as the coating can be ingested and cause damage. They also claim the're coating to be thicker and a superior insulator. Jet hot seems to be the more popular choice however and I haven't heard many complaints and most peeling seems to have been improper prep work or the wrong temp coating was used.

The gains in thermal efficiency may be small but they are there. It's a question of how meticulous you want to be in your quest for efficiency- somthing YOU need to answer yourself.

 

Swain and Jet Hot disagree because their products are different. Swain's product has actuall flakes suspened in the coating (not good for turbos to ingest). The Jet Hot is safe to put inside manifolds.

 

LOL, Jet Hot flakes all over the place. One of our three race cars has Jet Coated headers and it is flaking off. I don't want ANYTHING inside my manifold.

 

well, that does it, no coating on the inside for sure! but I am still interested if there IS anyone out there with any sort of conclusive evidence that keeping the heat in on the cast manifold is of any importance... or at least worth 125 dollars. (you know, not the average: well it depends on if you want to be that meticulous, or well, its just a matter of taste, or the like... its not about taste, if its worth 125... meaning there are measureable gains, then its worth it.)

 

I'm at the bottom of page two. Actually dyno's do measure responsiveness.

The porting and coating we did on our manifold, 02 housing and turbine housing were all done at the same time. So I didn't do an independent test of coating and then porting. There were good gains from doing the port/coating work. The results can be found somewhere in our dyno thread here on EVOM.

To be honest, I don't know if the coating will gain anything on spool up or actual HP. I am sure though that you will not loose power. For me the biggest reason to do it was the ignorant design of the hood on the car. It allows water, salt, bird **** and anything else to get in and on the engine. As you all know it takes no time for the manifold and such to look like crap. The coating keeps it looking nice, that is my largest reason for doing/offering it.

David Buschur
www.buschurracing.com

 

Hey Dave, I see that you guys coat the insides of the o2 housing and manifold. Whats your opinion on the potential flaking off and causing damage to the turbine?

 

I agree with David that the coating is much less useful for performance than it is for protecting the parts around the manifold better and reducing underhood temps a bit.

 

I must say your an awsome and admirable man. Keep up the honesty and your business will surely flurish (sp?) !

 

how can you people dispel false information like this? heat is not what drives the turbine... if i had an engine sitting by a river and i had a water powered fan blowing air into the engine you'd get the SAME effect of turbocharging without heat. if i had the same fan blow air through the exhaust side of a turbo you'd get the same effect without heat.

the purpose of coating a manifold is MAINLY for the strength of the manifold, to keep the mani from getting too extremely heat cycled. THIS IS A LOSING BATTLE, but people do it cuz they don't like **** breaking sooner than later. if you have a cast mani... who gives a **** about a coating... just get it ported and polished.

the ancillary effects of coating are

keeping the engine temps down... this helps if you have cam angle sensors... you all have them....
it also helps if you don't have an intake box or a cold air intake... yes cold air is better than warm/ hot air in the intake.
you increase the temperature and hence the kinetic energy of the gases passing through the turbine which will increase your turbine efficiency.

i did not say anything about the magnitudes ancillary effects. they're just byproducts of the REAL reason you get the coatings. do tehy amount to much? shrugs. BUT the reason that everyone gets them is because we're all in teh car industry and that somehow makes us inherently nitpicky of every little thing that can increase the efficiency of our cars (at least the people that are serious... others are just following). and that's why people get their **** coated.

 

this is what i've been trying to explain, heat itself does not directly effect the efficency of the turbines.. heat only helps it through the scavenging effect, hotter gas tends to travel faster but it does not directly "feed" the turbos...

 

Well, Buschur Jet hots their manifold and o2 housings so the egt's on those race cars must have exceeded 1300 F for the coating to start flaking. Since the guys at buschur coat the insides too, they must be confident that it won't flake off. But I'm not sure what kind of temperatures evo manifold's can get to. Hopefully somewhere under 1300F.

 

That is absolutely incorrect. Do you have any idea how a turbine works? On passing through the nozzle the working fluid drops temperature and increases in speed. That momentum is what drives the turbine. A simple water wheel effect in the exhaust like you're describing couldn't generate any useful work.

In fact, I am "dispelling" false information -- you're dispensing it. Ultimately heat has been driving most engines for the past 400 years.

Dave