Why are my RAVE valves melting?

[scooper77515]

I replaced a bunch of the rubber parts thinking the o-rings were leaking, etc. But I keep melting through my rear cylinder RAVE valve plastic parts.

Any idea why the heat is blowing by and melting my stuff?

I am currently going to take the entire RAVE assembly off my XP and put it on the boat until I can buy parts. The only difference I can see is that the XP valves do not have these 2 grooves like the Challenger ones do.

I wonder if they are part of the problem with letting the exhaust gases slide up the groove and into the rubber parts?

Never had a problem like this on my XP...

Rained all night, and bilge ran and killed my battery, so will run it on the hose when the battery charges and see what happens.

 

[scooper77515]

Went out to a new location and drove for about 2 hours. Much of it at 75%+ throttle. The XP raves worked wonderfully, and no melting.

I guess it is just time to rebuild them from scratch all the way up and try again (so I can put the XP back together:reddevil.

Still haven't figured out what caused 3 of them over the past 2 weeks to fail (2 ripped bellows, and 2 melted plunger/piston plastic bottom parts, that the bellows snaps onto, and one cap and red plug, and spring).