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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Heat coating on catless DP's?



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      06-17-2013, 03:52 PM   #23
CSL335i
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Based on our experiences in motorsport, if you well design your ceramic coating system, you can have the following gains:
- decrease engine heat stress up to 30%!!!!
- increase the speed of exhaust gas
- increase VE
- better fuel burn
- slightly less emission
- well ceramic coated pistons can resist more for knocking.
- if you use ceramic coating on piston heads, on valves and on cylider heads (as a heat mirror or heat trap), you will have a larger intervalum, where you can play with ignition.
- engine without ceramic coating with as usual ignition has the same heat stress like the engine with ceramic coating but with extrem ignition (but this engine has more power) or engine with ceramic coating with as usual ignition has 30% less heat stress.

Also another point of design at m rebuilt n54 engine. I do not afraid of the factory oil thermostat and higher oil temperature (there is a good reason, why bmw engineers apply higher than usual oil temperature combined with first gen DI) I am using ceramic coating, which keeps my engine temp down a little bit, while do not allow for the oil to go up. This is all about efficent of fuel-air mixture burn. Keep the highest possibly temperature in the combustion chamber, and keep other part of the engine cooler.
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      07-18-2013, 07:28 PM   #24
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Quote:
Originally Posted by E90Company View Post
Let me know what you can find because I'm interested. The company is Future Metals Inc.
So, I didn't get much at work, but in looking more deeply into ceramic coatings myself, here is what I found from Zircotec's website:

"Q37. I have been told that I should not use exhaust wrap with my stainless steel manifold because it might corrode or even crack. Is this also true for your coating? - Here at Zircotec we have coated a significant number of stainless steel manifolds and exhaust parts without experiencing any problem. Our technical specialists confirm that stainless steel can corrode very quickly under certain conditions, though Zircotec's coatings serve to protect against this type of corrosion and cracking. Unprotected stainless steel can suffer very rapid intergranular corrosion in poorly controlled welds or where the material of construction is poor quality. There is also a little known phenomena called chloride stress corrosion cracking by which highly stressed parts, including those made of stainless steel (such as stainless steel exhaust manifolds) can undergo extremely rapid attack by chloride. This effect can be so pronounced that the stainless steel parts will appear to have just rotted away. The worry here is that the materials used in exhaust wrap can often contain chlorides, and these can be released when the exhaust wrap gets hot. Furthermore, many chemical cleaners and road contaminants that might get trapped in exhaust wrap do also contain chloride materials. In view of this, our technical specialists advise that exhaust wrap should not be used on stainless steel manifolds or exhaust systems."
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