Ceramic Coatings and Turbos
02-16-2004, 10:24 PM
#1
Ceramic Coatings and Turbos I'm the first to admit I often learn as I go, gather opinions, do research and run with it...
But Im not completely sold on ceramic caotings for a high boost turbo set-up, or better said, not sure which parts can really make a difference.
Pistons... obviously are the most common. My concern was keeping too much heat in the chamber..raising charged air temps (this was addressed earlier with good answer).
but what about exhaust ports..necessary or adviseable on aluminum heads...if they flake would they damage the turbo...will the heat allow expansion of the ports allowing these to flake? any aqvisement in the LS1 world?
What about turbo manifolds...I uderstand the theory, but wont this pump hotter exhaust gasses into the turbo housing, which can in turn raise charged air temps? If its okay to do exhaust ports, then waht about the inside of the manifold along eith the outside?
And turbo housings...would that not just keep the oil in the turbos hotter? That cant be good either..
It must be a trade off... better performance, more reliability...but am I truely getting both...seems like heat is an enemy in the turbo motor more than anything.
At his point I'll have enough power and I'm interested in the durability of the set-up.
N2O...I'd coat it all.
But Im not completely sold on ceramic caotings for a high boost turbo set-up, or better said, not sure which parts can really make a difference.
Pistons... obviously are the most common. My concern was keeping too much heat in the chamber..raising charged air temps (this was addressed earlier with good answer).
but what about exhaust ports..necessary or adviseable on aluminum heads...if they flake would they damage the turbo...will the heat allow expansion of the ports allowing these to flake? any aqvisement in the LS1 world?
What about turbo manifolds...I uderstand the theory, but wont this pump hotter exhaust gasses into the turbo housing, which can in turn raise charged air temps? If its okay to do exhaust ports, then waht about the inside of the manifold along eith the outside?
And turbo housings...would that not just keep the oil in the turbos hotter? That cant be good either..
It must be a trade off... better performance, more reliability...but am I truely getting both...seems like heat is an enemy in the turbo motor more than anything.
At his point I'll have enough power and I'm interested in the durability of the set-up.N2O...I'd coat it all.
Last edited by Jammer; 02-17-2004 at 12:09 AM.
02-16-2004, 10:53 PM
#2
With proper cooling, your turbo will be fine, and work better with hotter exhaust gases driving it. As for the coating coming off the exhuast walls, well of course that would suck for the turbo to take in. That's something to discuss with the coating manufacturer.
02-17-2004, 05:52 AM
#3
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Keeping the heat in on the exhaust side will keep the exhaust velocities up, which is good since the turbo will spool faster. Of course, you'll be running twins, so that should help somewhat too. If you have a good intercooler, that extra heat in the turbo shouldn't hurt you that much if at all. The differences would be minimal.
I was told not to coat my Turbo Tech manifold since the extra heat has been known to make the manifold crack, and welding with the coating on it is tough. That is something to keep in mind too, unless you are going to use something like Inconel to make the manifolds with.
Just my .05
I was told not to coat my Turbo Tech manifold since the extra heat has been known to make the manifold crack, and welding with the coating on it is tough. That is something to keep in mind too, unless you are going to use something like Inconel to make the manifolds with.
Just my .05
02-17-2004, 11:22 AM
#4
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Jason,
With a ceramic coated hot side, you would have slightly higher egt temps, but the thermal tranfer to the compressor side would be negatated by the coating itself insulating the center section.
With a ceramic coated hot side, you would have slightly higher egt temps, but the thermal tranfer to the compressor side would be negatated by the coating itself insulating the center section.
02-17-2004, 11:38 AM
#5
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I extensively coated my Turbo at Polydyn. I took the turbo apart and coated the inlet side completely. I then thermal coated the hotside inside and out. I coated anyhting basically yhat could be coated. I am a big believer in coatings. Polydyn in Houston is the top of the heap as far as I am concerned.
02-17-2004, 02:43 PM
#6
I had my JE pistons coated by Calico Coatings with the cerama coat tops and teflon coating on the skirts. Price was very reasonable. Around $22/piston I think. I plan to run 25-30psi boost and wanted the extra barrier the coatings provide (700hp+). You want the heat in the chambers.... when the piston tops get too hot from heat soaking that is what will help lead them to failure if you detonate at that time. The skirt coating helps to reduce friction if the pistons ever expand too much from high coolant temps and could get in contact with the bore etc and also normal operation it helps.
I overheated my previous motor (fans stopped working and I went one more exit too far) with JE's and the aluminum transferred to the cylinder walls when the pistons expanded too much. I believe with the coatings this may have been avoided. I now plan to run larger radiator and larger Efan as well. This was in a GN powered RX-7.
The idea on a turbo motor is to keep the exhaust gasses hot and velocities up. Helps to spool the turbo and keep underhood temps down. Keep the heat in the headers.... not heat soak the rest of the engine bay.
-GNX7 Mark
I overheated my previous motor (fans stopped working and I went one more exit too far) with JE's and the aluminum transferred to the cylinder walls when the pistons expanded too much. I believe with the coatings this may have been avoided. I now plan to run larger radiator and larger Efan as well. This was in a GN powered RX-7.
The idea on a turbo motor is to keep the exhaust gasses hot and velocities up. Helps to spool the turbo and keep underhood temps down. Keep the heat in the headers.... not heat soak the rest of the engine bay.
-GNX7 Mark
02-17-2004, 10:47 PM
#7
Great input from everyone. Thanks. Looking basically at two things now... I have 304 stainless logs that were made by CAS origionally...they have been known to crack as it is...so Im concerned about coating them. As far as piston tops... I'm swinging back to think it may be a no brainer....The turbos...gotta work that one out mre in my head...otherstuff would be nice...but dammit gotta stop somewhere.
Thanks again to all.
Thanks again to all.
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02-18-2004, 04:04 PM
#9
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Theres a local shop that does ceramic and friction coatings in my town...they have a pistons and side skirt coating...
Should i be concerned on what coating or product they use ? any certains ones i want more than others...
Should i be concerned on what coating or product they use ? any certains ones i want more than others...
