stan_d
stan_d Dork
12/1/15 5:54 p.m.

Is there such a thing ? I found some good forged pistons and would like to put the slick coating on the sides. Challenge car engine. So 125 each is way too much. Which is what a local shop wanted.

Jumper K. Balls
Jumper K. Balls UberDork
12/1/15 6:18 p.m.

I did it with techline coatings

http://www.techlinecoatings.com/hi-performance/bs-internal-engine-coatings.html

The ceramic coating on top and the teflon-ish coating on the skirts

 photo pistoncoated.jpg

Applied with an airbrush and baked in the oven as per their instructions.

I have no idea how well it has worked. That little motor sustained 21psi of boost for over a year of daily abuse before it burnt a valve. I plan on popping the head off soon to inspect it. I have my doubts there will be any sign of either product left anywhere, but who knows? Maybe it was the key to that motor hanging together under that kind of abuse?

44Dwarf
44Dwarf UltraDork
12/1/15 7:59 p.m.

I have a bottle of dome coat here somewhere but never got around to applying it and lost the instructions long ago. A small bottle is very heavy.

echoechoecho
echoechoecho Reader
12/1/15 8:11 p.m.

when I was rebuilding the engine for my challenge car I found an old jar of tungsten disulfide at my dads house its used to coat bullets. I coated the piston skirts with it(just rub it on) I dont know if it did anything but it cant make it worse right?

physician
physician New Reader
12/1/15 9:10 p.m.

How much does that go for?

jimbbski
jimbbski Dork
12/1/15 10:44 p.m.

Techline sells various types of coatings. I have used the piston skirt and top coatings as well as one for headers. Some OEM engines have the piston skirt coatings from the factory so that tells you something. The piston skirt coatings reduce scuffing when "tight" clearances are used and on "dry" starts.

For some applications the surface needs to be glass bead blasted or sand blasted to provide bite for the coating to stick.

914Driver
914Driver MegaDork
12/2/15 6:46 a.m.

I rebuilt a BMW 2002 engine and put Dry Moly (molybdenum disulfide) on the piston skirts, rods and most everything that didn't move. It dissipated heat better and enhanced lubrication between mating parts.

The stuff I used was sprayed on and then baked at 300'. No dyno numbers to prove results, but I slept better knowing I did all that I could.

http://www.chemprocessing.com/finishes/dry-film-lubricant.html

Dan

Don49
Don49 HalfDork
12/2/15 7:26 a.m.

I've been using the Techline coatings for years. They do work if applied correctly. I coated bearings in a 1275 Sprite motor for a customer and 12 races later they still looked new.

NickD
NickD Reader
12/2/15 8:04 a.m.

Hot Rod Magazine tested engine coatings a few years, they used Dart Machinery coatings. They determined that they weren't worth a whole lot in the power department but they did help the engine make the same power more consistently. Pull-to-pull variation was down by a ton as well as engine temps and they made over 180 dyno pulls on the engine.

http://www.hotrod.com/how-to/engine/hrdp-0612-engine-coatings/

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