Crossover vs Water Pump
11-30-2003, 01:54 AM
#21
Charter Member
Originally posted by Crazyhorse
I'd be inclined to think that Merc would be installing crossovers on their engines if they were such a godsend to marine engines. Instead Merc still uses a circulating pump on their supercharged engines.
I'd be inclined to think that Merc would be installing crossovers on their engines if they were such a godsend to marine engines. Instead Merc still uses a circulating pump on their supercharged engines.
OK boys, your turn!
11-30-2003, 07:03 AM
#22
Registered
Originally posted by US1 Fountain
Are you sure about that?
The impellor in the circ pump is not 'sealed' like in your raw water pump.
Are you sure about that?
The impellor in the circ pump is not 'sealed' like in your raw water pump.
You can run a crossover with a thermostat and eliminate another source of breakdowns. IMHO, one less thing to break is always a good thing.
Scott B
If I wanted to float around powerless, I'd get a blowboat
11-30-2003, 07:51 AM
#23
VIP Member
VIP Member
Great Thread Guys,
I did install crossovers with T-stats in a 28' Cigarette that we had. They worked well to create more room to work on the front of those engines. Man they were stuffed in there...
I did install crossovers with T-stats in a 28' Cigarette that we had. They worked well to create more room to work on the front of those engines. Man they were stuffed in there...
__________________
Patrick
Patrick
11-30-2003, 09:56 AM
#24
Toxic FORMULA
Platinum Member
Originally posted by Scott B
$.02
. However, if a circ pump goes bad, your raw water pump cannot pump past it,so again it does you no good.. Scott B
$.02
. However, if a circ pump goes bad, your raw water pump cannot pump past it,so again it does you no good.. Scott B
I've been there and done that and it worked.
It was good at idle and I could beat on it all day with no problem. If I ran just off plane , you know , bow in the air pushing water...It would run up to 200*
11-30-2003, 10:55 AM
#25
Registered
Originally posted by mopower
Scott , better check your figures again.
I've been there and done that and it worked.
It was good at idle and I could beat on it all day with no problem. If I ran just off plane , you know , bow in the air pushing water...It would run up to 200*
Scott , better check your figures again.
I've been there and done that and it worked.
It was good at idle and I could beat on it all day with no problem. If I ran just off plane , you know , bow in the air pushing water...It would run up to 200*
IMO, the circ pump is dead weight, and when it blows a bearing you cannot pump against it since your raw water pump is now dead also... I should have clarified that in the first post
I dont see the point of a circ pump when we all know it is a problem child, so why have it if it is not needed?
Scott B
If I wanted to float around powerless, I'd get a blowboat
11-30-2003, 11:18 AM
#28
Scott, I hear ya. I'm going on the fact that in my 35yrs of boating,(I'm 40 ) I have never had nor been a witness to a pump going out. It has only been on this board in the last 3 yrs that I have heard of guys having trouble with pumps. And I'm on the water every weekend during the summer. So to me, it is not worth the hassles.
I don't understand your thought here:
IMO, the circ pump is dead weight, and when it blows a bearing you cannot pump against it since your raw water pump is now dead also...
They are driven from separate belts. The water pump will push water past a non rotating circulating pump because the impellor is in a void with no direct sealing. Thats why you can spin it by hand easily with the motor full of water as compared to your raw water pump.
Boat On!
) I have never had nor been a witness to a pump going out. It has only been on this board in the last 3 yrs that I have heard of guys having trouble with pumps. And I'm on the water every weekend during the summer. So to me, it is not worth the hassles. I don't understand your thought here:
IMO, the circ pump is dead weight, and when it blows a bearing you cannot pump against it since your raw water pump is now dead also...
They are driven from separate belts. The water pump will push water past a non rotating circulating pump because the impellor is in a void with no direct sealing. Thats why you can spin it by hand easily with the motor full of water as compared to your raw water pump.
Boat On!
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Some people are like Slinkies - Not really good for anything, but they
bring a smile to your face when pushed down the stairs.
Some people are like Slinkies - Not really good for anything, but they
bring a smile to your face when pushed down the stairs.
11-30-2003, 11:33 AM
#29
Registered
True.. [I really need to learn to clarify things better..] I am primarily thinking of serpentine belt accessory drive setups. You are correct in the older boats having separate belts. Considering mine are older boats you think I might remember that wouldn't' ya...
Scott B
Back to the twins are better.. Or, are we still discussing boats?
Scott B
Back to the twins are better.. Or, are we still discussing boats?
