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Thread: plz help 1st time owner
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12-13-2009, 10:28 PM #16
ball valves are 1/4 turn, gate valves are like the out door faucts.
Never restrict the discharge, you will over pressure the block doing so! The jet pump is capable of over 300 psi on the inlet. Duanes info is solid info79 Southwind Tunnel Dragster 540ci BBC
UMPBA 926 Gas Jet
My Projects http://s200.photobucket.com/user/Dir...?sort=3&page=1
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12-13-2009, 10:31 PM #17
12psi?
Im not disagreeing with you, Im not familure the heating and cooling of automobile engines, just with systems that i instal at work. If there are poor gaskets that are not meant to handle more then 20psi then yes restricting the outlet could result in a blow out.
what is the pumping pressure of the pump supplying the cooling system? in a perfect world the gaskets should have a 50% safety factor ontop of the max pumping prssure he pump could supply to the system
again not directly regarding automobile engines but with regardes to other heating and cooling systems
jay89 charger-93 merc 2.5L 245hp
Soon to be MAD EFI!
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12-13-2009, 10:33 PM #18
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12-13-2009, 10:38 PM #19Junior Member
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Ok maybe this is easier> here is the inlet from left side of the boat (drivers side)
And here at the bottom you will see the outlet> The tap is off to the bottom of the headers kinda hiding lol It exits straight out of the boat at the back in a stream of water. This help lol
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12-13-2009, 10:42 PM #205000 RPM
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You're loooking at the situation wrong. If it were an appliance, you are aboutely correct. BUT, this is an engine with a high pressure jet pump behind it. The difference here is that you have an over abundance of water already coming to the engine. So unlike a pump, you are not starving the engine. Even though you are slowing the flow down, there is still more water than needed. We've been through this many times on these boards. Many argue that it should be a ball valve because they flow more water. They do, I agree, but we are tryin to flow less water here so that it will stay in the engine long enough to heat it up. Duane HTP
Last edited by Duane HTP; 12-13-2009 at 10:45 PM.
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12-13-2009, 10:50 PM #21
i stand corrected, and a ball valve deffinatly should not be used to throttle ever. a gate valve is borderline as it can chatter and fail. Globe valve is kinda outta the question as even fully open it has a sevearly restricted passage.
jay89 charger-93 merc 2.5L 245hp
Soon to be MAD EFI!
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12-13-2009, 11:06 PM #22Junior Member
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Did my pics show up? I cant see them now
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12-14-2009, 11:58 AM #23
I'd listen to Duane, he's been at this game a long time... It's what he does for a living. He's a regular on a couple of the Jet specific forums I hang out on, and a hell of a nice guy....
Gary B>
GaryB> Darskide's Calling
'86 Eliminator Daytona/225 Excel in V-6 Special "Now hitting 90!!"
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12-14-2009, 03:12 PM #24Junior Member
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So i assume the moral of the story is adjust the outflow to regulate the heat for the engine and leave the inlet wide open? What temp should the engine be running at so its not too hot?
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12-14-2009, 04:10 PM #25
NO DO NOT ADJUST THE OUTLET!!!!!!!!Turst me, been there done it. By the time in knew it, my motor had about five extra liters in my oil pan and no it was not oil. It was water, witch went buy a set of ban new head gaskets. Cost me a crank, set of rods, spun number three main bearing. To fix my motor had to buy new crank, rods, new bearing, get the crank & rods blanced, new billet 4 bolt main caps, line bore and hone & gaskets. NOT TO MENTION THE TIME, THAT I COULD NOT BE OUT IN MY BOAT.
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12-14-2009, 04:50 PM #26
Whoa there fella. I said i stood corrected and i also explained why i suggested what i did in the first place.
clear?89 charger-93 merc 2.5L 245hp
Soon to be MAD EFI!
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12-14-2009, 07:35 PM #27
pics
hey rollinstrapped, try those pics again , would like to see your new boat including the valve in question.
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12-14-2009, 08:24 PM #28Member
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HI-Tech Performance sells a kit that gets rid of the extra pressure from the pump and still keeps a nice flow of water to the motor.
I ran one on my last boat with a blown 1000hp 540 and it worked great!
Had good engine temp and no spikes or swings in temp all day on the river
Here is a link if anyone is interested
http://www.hi-techperformance.com/HPParts.HTM
Its 3/4 the way down the page "Water Bypass Kit"
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12-14-2009, 09:40 PM #29Junior Member
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Here is the only pic i have of my new boat right now hooked up to my denali
Here is the outlet on the motor passenger side right hand side of the motor,Its hiding just under the header to left bottom
This is the inlet of the motor
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12-14-2009, 10:16 PM #30
Man do not restrict the outlet flow.You will have H2o running out the valve covers....I have a bypass on my inlet...If the pressure goes above 15psi it lets the excess out another outlet....If you have a bypass like me then you can play with the outlet water to regulate temp....b cool dude....
79 Wriedt Maverick
Blown 454
Berk JF-A pump
07 Bennington 5.0
98 Yamaha XL1200