coatings on pistons
09-02-2005, 11:51 AM
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coatings on pistons
i was told by julian godfreys woman on the phone yesterday "it makes the pistons better and releases more bhp" can anyone tell me what it is and what it does . it costs £46 for each piston to be coated
i dont think i,l be having it done but im interested for future reference 
09-02-2005, 12:00 PM
#4
The basic idea is that its effectively a reflective coating, which keeps heat in the combustion chamber.
This makes it less likely for you to a melt a piston but more likely to blow a head gasket.
Im not convinced it will be of any real use on most YB engines though as tehy have such good under piston oil cooling anyway.
This makes it less likely for you to a melt a piston but more likely to blow a head gasket.
Im not convinced it will be of any real use on most YB engines though as tehy have such good under piston oil cooling anyway.
09-02-2005, 12:11 PM
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brad. I think julian godrey knows what he is on about 
i heard about this ages ago, being used on jap cars, and a mate with a maestro turbo was gona do it too.
i heard about this ages ago, being used on jap cars, and a mate with a maestro turbo
was gona do it too.
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09-02-2005, 12:17 PM
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im not doubting julian godfrey's ability at all , but it seemd to be a bit of a pointless exercise on a 500 bhp engine what im saying is in 1987 when cossies were racing with that kind of power did they need coated pistons ? also if the car is mapped properly in the 1st place , why would pistons need to be coated ? if the temps get hot enuff to melt a piston you have a problem and somethings gna break anyway
what im saying is in 1987 when cossies were racing with that kind of power did they need coated pistons ? also if the car is mapped properly in the 1st place , why would pistons need to be coated ? if the temps get hot enuff to melt a piston you have a problem and somethings gna break anyway
09-02-2005, 01:10 PM
#11
Its generally a high tech version of a ceramic coating Brad. Usually applied to teh piston crowns only and can help keep the pistons cool in big BHP applications, as well as stop very light det destroying them as its incredibly hard 
We charge £200inc vat for a set to be done, but will only do it if we supplied the pistons and assembled the engine as well due to warranty issues should either process/item fail in service on an engine we have warrantied.
Edited to say:
I started this reply at 1pm then had to go out in a car, if id refreshed itr id have saved a reply
We charge £200inc vat for a set to be done, but will only do it if we supplied the pistons and assembled the engine as well due to warranty issues should either process/item fail in service on an engine we have warrantied.
Edited to say:
I started this reply at 1pm then had to go out in a car, if id refreshed itr id have saved a reply
09-02-2005, 01:26 PM
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cheers boss , after reading steves link it looks like a good product , i just dont know if its worthwile on a spec like mine will be . i spose if i have an extra £200 odd sitting around (i wish 
) i would consider it .
) i would consider it .
09-02-2005, 01:32 PM
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it tends to be used more on cast pistons than forged, as it narrows the gap between the two. Cosworth specced them OEM for the FBA (24v) lump as it made it less noisy than forged pistons (the clearances are much tighter with cast as they expand less with heat) but stronger and more reliable than cast ones.
09-02-2005, 01:35 PM
#14
Careful with words like stronger, it wont effect the pistons ability to withstand compression chamber pressures without "doing a pulsar" and collapsing, its purely the heat handling that changes.
09-02-2005, 01:44 PM
#15
Norris Motorsport
May I also add that if an engine has decent piston cooling jets, then the benefit of ceramic coating to the crowns of the pistons is pretty minimal. In an extreme application (i.e. extreme racing applications) it's usefull as it prevents a lot of heat entering the pistons, making the job of the piston cooling oil easier, but for a road car is completely unnecessary IF you have piston cooling jets.
If like for example on a cvh turbo engine you have'nt modified the engine with piston cooling jets and it does'nt have them as std then its a worthwhile modification especially so, on very highly boosted engines.
If like for example on a cvh turbo engine you have'nt modified the engine with piston cooling jets and it does'nt have them as std then its a worthwhile modification especially so, on very highly boosted engines.
09-02-2005, 05:47 PM
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I've seen pistons with 2 different coatings:
Ceramic coated crowns to prevent as much heat transfer into the piston as possible so that you can run AFRs closer to best power (12.7:1) at higher boost levels rather than having to use additional fuel to keep the piston crowns relatively cool.
Moly coated skirts are supposed to reduce friction between the piston and cylinder wall. I have a set of moly coated skirt pistons in my new rally engine. Will post more after I have it on the dyno in a few weeks.
Ceramic coated crowns to prevent as much heat transfer into the piston as possible so that you can run AFRs closer to best power (12.7:1) at higher boost levels rather than having to use additional fuel to keep the piston crowns relatively cool.
Moly coated skirts are supposed to reduce friction between the piston and cylinder wall. I have a set of moly coated skirt pistons in my new rally engine. Will post more after I have it on the dyno in a few weeks.
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