Pistons-coated or not ??

J.R. Haddad · 01-27-2017, 08:20 PM

I'm told different opinions on coating on pistons. Even been
told it will wear off quickly. Good or bad? I'm also told there are different types of coating. So if coating is good,
what kind of coating? Thanks, J.R.

Alan Roehrich · 01-27-2017, 10:53 PM

A good quality coating on the piston skirt will make the hone finish on the cylinder wall last longer. I've seen that myself, and my findings were duplicated by several others, including the Morgan brothers who worked with Reher and Morrison.

An oil shedding coating on the bottom might prevent oil from clinging to the piston, allowing more oil to return to the oil pan.

A thermal barrier coating on the top is most likely illegal. But it will allow for a tighter piston to wall clearance, and will reflect the heat back into the chamber.

rallye bob · 01-30-2017, 06:36 PM

I'm thinking of going with the Line2Line APC coating on the skirts, but I'm not a class racer, just a bracket racer.... I run a vacuum pump so I am also going to get the wrist pins coated. I am a first timer with these processes.... Discussion?

nickh · 01-30-2017, 07:55 PM

Look at Polydyne as well, had 565 outlaw prostreet NOS motor had 3 different coatings 1. ceramic top of piston 2. coating on piston skirts 3. Coatng inside piston and also had pins coated as well. Everything looked brand new when pulled it down for freshen up.

01-27-2017, 08:20 PM	#1
J.R. Haddad Senior Member Join Date: Jun 2012 Posts: 624 Likes: 515 Liked 879 Times in 196 Posts	Pistons-coated or not ?? I'm told different opinions on coating on pistons. Even been told it will wear off quickly. Good or bad? I'm also told there are different types of coating. So if coating is good, what kind of coating? Thanks, J.R.

01-27-2017, 10:53 PM	#2
Alan Roehrich VIP Member Join Date: May 2006 Location: Murfreesboro TN Posts: 4,915 Likes: 996 Liked 1,042 Times in 274 Posts	Re: Pistons-coated or not ?? A good quality coating on the piston skirt will make the hone finish on the cylinder wall last longer. I've seen that myself, and my findings were duplicated by several others, including the Morgan brothers who worked with Reher and Morrison. An oil shedding coating on the bottom might prevent oil from clinging to the piston, allowing more oil to return to the oil pan. A thermal barrier coating on the top is most likely illegal. But it will allow for a tighter piston to wall clearance, and will reflect the heat back into the chamber. __________________ Alan Roehrich 212A G/S

01-30-2017, 06:36 PM	#3
rallye bob Member Join Date: Sep 2006 Location: Genoa, Illinois Posts: 488 Likes: 8 Liked 6 Times in 4 Posts	Re: Pistons-coated or not ?? I'm thinking of going with the Line2Line APC coating on the skirts, but I'm not a class racer, just a bracket racer.... I run a vacuum pump so I am also going to get the wrist pins coated. I am a first timer with these processes.... Discussion?

01-30-2017, 07:55 PM	#4
nickh Senior Member Join Date: Sep 2010 Location: Houston,Texas Posts: 670 Likes: 1,837 Liked 235 Times in 97 Posts	Re: Pistons-coated or not ?? Look at Polydyne as well, had 565 outlaw prostreet NOS motor had 3 different coatings 1. ceramic top of piston 2. coating on piston skirts 3. Coatng inside piston and also had pins coated as well. Everything looked brand new when pulled it down for freshen up.