Rave Valves

[Dr Len]

Was working on my jet boat this weekend and went to inspect the raves and to my surprise.Poped the covers off and they were melted. so I started taking them apart. I pulled the gilotine out and they were burt to a crisp.I guess the previous owner never serviced them.But holy smokes.
Anyway I ordered everything new. The question is what caused this. Im new to the 787 motors.

[Ibreakstuff]

You're sure they're melted - not just gunked up?

If your RAVES got hot enough to melt, then so did your pistons. Look down the RAVE guide to the pistons. Make sure the top/crown is in good shape.

Bryan

[Dr Len]

The motors have plenty of compression 145 to 150 psi in each cylnder.
I think the previous owner never had them serviced. They were pretty gummed up.

[Ibreakstuff]

Do you have any pics of the RAVEs?

I've seen engines with great compression that in fact had stuck rings. But then it runs for a couple hours and voila, scored walls and time for a bore/sleeve/re-chrome. It's worth the 2 little bolts to take those RAVEs back off, trust me.

Bryan

[mongorunner]

You're sure they're melted - not just gunked up?

If your RAVES got hot enough to melt, then so did your pistons. Look down the RAVE guide to the pistons. Make sure the top/crown is in good shape.

Bryan

i think he's talking about the rave piston melting...

did you order new rave valves, bellows pistons and valve covers?

i found that the Orings on my 95 had dried out and were causing blowby

[Dr Len]

Just took the boat out.What a difference.Runs great. Jumps right up on plane 7000 rpms. Thanks Ibreakstuff for your help.I owe you one Bryan.

[Ibreakstuff]

Not a problem. You can take me out sometime on the Jersey Shores in it - I've seen movies!

Bryan