Water Crossover with or without bypass??
09-21-2007 | 03:38 PM
#2
Platinum Member
Joined: Jun 2001
Posts: 21,346
Likes: 10
I was just asking the same kinds of questions not too long ago.
The deciding factor is whether you use a T-stat or not.
If there's no T-stat, water will always flow through the block, out the empty T-stat housing and out to the exhaust at all times, without over-pressurizing.
However you run the risk of running too cold this way, and with and EFI engine, that's no good. Usually only big blower motors run like this, because they're making too much heat in most instances.
If you use use a T-stat to control temps, you should have a by-pass so that water can still flow into the exhaust while the engine's still too cold to open up the T-stat, and also relieve some block pressure.
If you do go the T-stat route, it's also a good idea to drill 2 or three 1/8" to 3/16" holes around the perimeter of the t-stat so that even when it's cold some water will move through the block at all times. You don't want non-moving water just sitting in your block.
How many holes and what size is pretty much trial and error monitoring your temps.
Here's a recent thread with another good link within.
http://www.offshoreonly.com/forums/s...d.php?t=165707
The deciding factor is whether you use a T-stat or not.
If there's no T-stat, water will always flow through the block, out the empty T-stat housing and out to the exhaust at all times, without over-pressurizing.
However you run the risk of running too cold this way, and with and EFI engine, that's no good. Usually only big blower motors run like this, because they're making too much heat in most instances.
If you use use a T-stat to control temps, you should have a by-pass so that water can still flow into the exhaust while the engine's still too cold to open up the T-stat, and also relieve some block pressure.
If you do go the T-stat route, it's also a good idea to drill 2 or three 1/8" to 3/16" holes around the perimeter of the t-stat so that even when it's cold some water will move through the block at all times. You don't want non-moving water just sitting in your block.
How many holes and what size is pretty much trial and error monitoring your temps.
Here's a recent thread with another good link within.
http://www.offshoreonly.com/forums/s...d.php?t=165707
Last edited by CigDaze; 09-21-2007 at 03:47 PM.
09-21-2007 | 03:47 PM
#3
Frank's Marine Service
Joined: Sep 2002
Posts: 11,959
Likes: 142
From: Elkton, MD
My opinion is that it depends how much power you're making....
I've run it both ways over the years.... 500-550 NA's with bypass and t-stat and 830 hp supercharged without t-stat and bypass.
If you're not running big power I would run a t-stat but thats just my opinion.
I've run it both ways over the years.... 500-550 NA's with bypass and t-stat and 830 hp supercharged without t-stat and bypass.
If you're not running big power I would run a t-stat but thats just my opinion.
09-25-2007 | 04:21 PM
#5
Frank's Marine Service
Joined: Sep 2002
Posts: 11,959
Likes: 142
From: Elkton, MD
The raw water pump belt stays the same.
09-25-2007 | 10:21 PM
#6
Registered
Joined: Aug 2006
Posts: 629
Likes: 0
From: Colonial Beach VA
i know my sea water pump is a belt on its own , but the alternator and PS pump both run around the water pump , they keep it spinning , and i dont see e-nuff adjstment in there brackets to compensate for loss of water pump in the mix
09-26-2007 | 12:24 AM
#7
Registered
Joined: Dec 2005
Posts: 390
Likes: 0
From: Mission Viejo, CA
900++ Hp w/ blower and no circulating pump. I always run a thermostat because I want my engines and oil to warm up efficiently before going "BIG". I would only run without one if there was absolutely no other way....
Last edited by ghittner; 09-26-2007 at 12:35 AM.
09-26-2007 | 07:00 AM
#8
VIP Member
Joined: Dec 2001
Posts: 10,397
Likes: 402
From: Cape Coral, Florida
And my power steering and alternator run off of what ?
i know my sea water pump is a belt on its own , but the alternator and PS pump both run around the water pump , they keep it spinning , and i dont see e-nuff adjstment in there brackets to compensate for loss of water pump in the mix
i know my sea water pump is a belt on its own , but the alternator and PS pump both run around the water pump , they keep it spinning , and i dont see e-nuff adjstment in there brackets to compensate for loss of water pump in the mix
Ummmm, maybe they use the pully on the front of the crankshaft??????????? Just a guess!
I run a crossover with no thermostat. Big cube N/A's.
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09-26-2007 | 08:12 AM
#9
Frank's Marine Service
Joined: Sep 2002
Posts: 11,959
Likes: 142
From: Elkton, MD
And my power steering and alternator run off of what ?
i know my sea water pump is a belt on its own , but the alternator and PS pump both run around the water pump , they keep it spinning , and i dont see e-nuff adjstment in there brackets to compensate for loss of water pump in the mix
i know my sea water pump is a belt on its own , but the alternator and PS pump both run around the water pump , they keep it spinning , and i dont see e-nuff adjstment in there brackets to compensate for loss of water pump in the mix
Last edited by Panther; 09-26-2007 at 08:19 AM.
