Teflon coated piston skirts

**spetz** · 28-03-2006 02:05 AM

I seen that CTR pistons have teflon coating on the skirts.

And, also I can get it done for $50 per piston (my engine is apart now)

And, I am just wondering, what improvements are there?

Worthwhile?

**Slow96GSR** · 28-03-2006 05:18 AM

Look at my car page. I run cooler, the oil get back to the pan to cool and with the motor running cooler there's HP to be gained. Hell yes it's worth it. You can get more stuff coated to. Ceramic coatings for the top of the pistons, cylinder domes and intake/exhaust runners. Check out Calico once their site comes back!! I have been happy and $50 a piston is the going rate. Should include any shipping to.

**tinkerbell** · 28-03-2006 08:48 AM

i think the OEM coatign is a molybdenum coating, not teflon, but does the same job of reducing friction...

and is what helps the ITR engine to rev so high with such a poor rod/stroke ratio... (not an issue on B16A)

**spetz** · 28-03-2006 02:14 PM

But if the engine oil never reaches optimum working temperature, isn't that bad for wear and tear?

But, it seems like I may do that then!

**ProECU** · 28-03-2006 02:38 PM

Originally Posted by tinkerbell

i think the OEM coatign is a molybdenum coating, not teflon, but does the same job of reducing friction...

and is what helps the ITR engine to rev so high with such a poor rod/stroke ratio... (not an issue on B16A)

According to Mr Widmer, it's the bearing quality, design & material that facilitates it.

**aaronng** · 28-03-2006 03:09 PM

Don't think that molybdenum coated skirts are the end-all of high revvability. Even the Jazz VTi has moly coated piston skirts. As ProECU says, it is the bearings, materials, design and also perfect balancing and lightening.

**tinkerbell** · 28-03-2006 03:39 PM

try to keep it on topic fella's... the subject is quite clearly "if coating pistons provides improvements"... (not "is it the be all and end all of high revability", which it clearly isn't)

and spetz - any coating will not reduce friction so far that the oil doesnt heat up... the coating only provides friction reduction between the piston and cylinder wall, no where else...

**aaronng** · 28-03-2006 04:37 PM

And I was answering to his worthwhile part. He did ask if it was worthwhile.

**Weq** · 28-03-2006 06:33 PM

I have since had the domes cermic coated and modified to reduce heat absorbtion. unles ur running a hi-po motor, i wouldnt recommend cermic coating the head side of the combustion chambers though. heat has to go somewhere and the heat is the perfect place with plenty of cooling!

yes its worthwhile. $50 is a small price IMO.

less friction which means less expansion of the skirts. which means ur clearences are kept and can run them tighter.