Performance Boats Forum banner
1 - 5 of 5 Posts

·
Registered
Joined
·
179 Posts
It's not really sealing off the timing set, as the timing cover does that.
It's an adapter plate to eleminate the automotive water circulating pump, and to plumb cold water from the jet pump into the front of the engine.

Just FYI, you should never limit the flow out of the engine. Limit flow at the pump into the engine to desired running temps. Limiting flow out of the engine can (WILL) over pressure the cooling system, and push out head gaskets and intake gaskets.

Just my $0.02

Dan'l
 

·
Registered
Joined
·
179 Posts
50 degrees.
You want 50 degree rise from ambient lake temp.
Pressure relief valves have a common failure, sand.
I'd avoid the pressure relief valve, in favor of a gate valve. Less moving parts. Less (like zero) failure rate.
Adjust gate valve to desired running temp. My BBC/ headers runs 120 ish at cruise, 130ish WFO. 140/150 in the no wake zone.
I run a valve for the headers at the drivers' seat, and adjust as necessary.
One 5/8ths hose overboard handles the engine cooling. Super simple and reliable. I may have 5-7 lbs of pressure in the cooling system, and that's guessing. You don't want 20+ psi, Olds engines, originally in 70s cars, maybe had a 15 lb radiator cap. Probably less. There's a reason for this. Don't over think it. Cold on a jet single pass system is normal. But having too much pressure, especially on an Olds, is a disaster in the making.

Jet boat performance has a diagram for water routing on their website.

Hope this helps.

Dan'l
 

·
Registered
Joined
·
179 Posts
Sounds good, especially the pressure gauge.
Mine has a valve by the drivers'seat, so I don't have a gate valve on the overboard water line.
JBP's diagram and explanation makes sense. Without a drivers' seat valve, I'd do like the diagram.

Dan'l
 

·
Registered
Joined
·
179 Posts
I guess I was a bit vague.
I have a quarter inch line running to the drivers' seat (and back) for header water control.
I don't actually change engine temp on the fly, but can easily increase or decrease flow while on the beach. I've rarely done that.

Dan'l
 
1 - 5 of 5 Posts
Top