just like topic states i'm in the process of maybe building a new block if my rings are bad and i was wondering why do some people coat forged pistons and how does it help in a allmotor application and at what compression level should u consider coating the piston

 

bump i would like to know to

 

Kenny, Its pretty much like the coating used on the skirts of the Type-r pistons. It is supposed to help prevent wear on the cylinder walls and run tighter clearences thus reducing blow-by
HTH-Gil

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GUILOTINE &raquo;</TD></TR><TR><TD CLASS="quote"> Kenny, Its pretty much like the coating used on the skirts of the Type-r pistons. It is supposed to help prevent wear on the cylinder walls and run tighter clearences thus reducing blow-by
HTH-Gil</TD></TR></TABLE>
hey thanks

 

That's for the sides...each part of the piston is coated with a different material depending on what you are building and consequently opt for. The gold coat used on the top keeps the heat out of the piston which keeps it from expanding allowing tighter piston to wall clearences since you don't have to allow for expansion as much. You can go pretty tight with this. It can also assist in smooth flame front propagation across the face of the piston. It prevents hot spots from creating and detonation.

Side coatings was covered.

Coatings on the bottom of the piston is a slick surface intended to help the piston shed oil quickly.

Check out Swain's website for the nitty gritty on the many uses for coatings. I have never used coated peices on an all motor build, not that it shouldn't be but most of the time people aren't up that high in the power level.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by moto1320 &raquo;</TD></TR><TR><TD CLASS="quote">That's for the sides...each part of the piston is coated with a different material depending on what you are building and consequently opt for. The gold coat used on the top keeps the heat out of the piston which keeps it from expanding allowing tighter piston to wall clearences since you don't have to allow for expansion as much. You can go pretty tight with this. It can also assist in smooth flame front propagation across the face of the piston. It prevents hot spots from creating and detonation.

Side coatings was covered.

Coatings on the bottom of the piston is a slick surface intended to help the piston shed oil quickly.

Check out Swain's website for the nitty gritty on the many uses for coatings. I have never used coated peices on an all motor build, not that it shouldn't be but most of the time people aren't up that high in the power level. </TD></TR></TABLE>
very interesting

 

thanks for the info guys

 

Also. the coating on top of the piston--since it prevents the piston from absorbing the heat of combustion--more heat (energy) is used to drive the piston down the bore, as opposed to the heat just being used to heat up the coolant and in effect being wasted. In addition if you have a bore that has been honed to much and as a result is too big for the pistons you have, you can use the moly coating on the skirt to tighten up the piston to wall clearance. I think coatings are awesome!! You can also coat valves and combustion chambers. I think the reason alot of people don't do it is probably the downtime of sending everything out to be coated. They do make kits though, where you spray the coatings on yourself and then bake the parts in an oven to cure them.