[Geico266]

Is it normal for the fiberglass engine plenum to discolor due to heat from the engine on shut down? It seems to be above the cylinder fins. 0-320 160 HP.

Anything to do to protect it from heat?

Thanks in advance.

 

[Don Jones]

Well......

....mine has lots of dark discoloration spots in it and it has never
been run. The only running example I have seen is painted and
still looks like it did when it was first installed.
I think Sam bakes them when he builds them, which would explain the
dis-coloration on mine.

 

[Geico266]

I called James Cowl and they said the discoloration from heat was / is normal.

Might not be a bad idea to paint it with a good high temp paint.

 

[Nick]

Zippy,

I've done two james plenums now, the first unpainted the second finished out and painted in emron. Unpainted = discolor. Painted = no change.

Hope that helps.

 

[mannanj]

Heat

A few years ago, I asked Sam about the heat buildup. According to him, the Plenum is layed up with epoxy good for 400 deg. F.