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crossover debate

indybeck

indybeck

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Location
SE South Dakota
Allright, I have a question about thermostat crossovers. What are the flow differences between the single, and the double. Is it significant? Is it a life or death issue with our 6.5s? I am putting a radiator, and high flow pump on my pickup, but I was wondering about the crossover. Is it a good idea, or is the single ok?
 
Very interesting read, indeed! Well i guess that makes up my mind. I already purchased the '97 high flow water pump, and the gasket kit from NAPA, looks like the same fel-pro gasket set. Thanks for taking the time to find the link. I will try to take pictures and post them as I install.
 
Well I have a water pump on one of my other engines that vastly outflows the HO water pumps, and all it needs is a single high flow thermostat. I also wanted a way to block off the coolant bypass all the way, and I knew I didn't need any faster flow to the radiator based on that. I'm using one of the thermostats out of a Duramax engine :)
 
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chevyinlinesix said:
Well I have a water pump on one of my other engines that vastly outflows the HO water pumps, and all it needs is a single high flow thermostat. I also wanted a way to block off the coolant bypass all the way, and I knew I didn't need any faster flow to the radiator based on that. I'm using one of the thermostats out of a Duramax engine :)
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Chevy, what kind of pump you running, where did you get it? I need more flow on the 93 than the HO pump can provide.
 
docdray said:
emailed heath with no response, anybody know what restrictor he is using on bypass?
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Give them a call and ask for service support. Todd will probably field the call and should be able to answer that one. I hear Bill's been busier than a one legged man in an a$$ kicking contest of late.

Paul
 
Well, I had the place bookmarked, but when we got a new computer I just never loaded my bookmarks onto this one so I'm having a hard tome finding the site again.

Anyways, I'll take a picture today of what needs to be machined. There is a place in Sweden? that specializes in this, but if you can get a place to disassemble the water pump (or if someone can show me how to do it easier) you can have a machine shop modify the pump for you.

The flow gain was something like 30% over a HO
 
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chevyinlinesix said:
Well, I had the place bookmarked, but when we got a new computer I just never loaded my bookmarks onto this one so I'm having a hard tome finding the site again.

Anyways, I'll take a picture today of what needs to be machined. There is a place in Sweden? that specializes in this, but if you can get a place to disassemble the water pump (or if someone can show me how to do it easier) you can have a machine shop modify the pump for you.

The flow gain was something like 30% over a HO
Click to expand...

Cool, I need one of those. Then I could play with a four plunger marine pump. Any Ideal on the price to have one modified.
 
Very interested in seeing what it takes to make these pumps flow more evenly.

I don't like the idea of having to adapt a waterpump onto the engine that has the thread-on fan clutch. I've got a Kennedy fan clutch that works great and can engage when the engine is steadily running 2400RPM. The factory and many aftermarkets can't (require you to slow down engine to fully engage), or on time that is. So, I'd like to keep my KD clutch with HO pump and Dual stats.

I figure if we can modify the existing stuff, not for more flow, but for even flow, and increased flow where we need it (even # cylinder banks) that it'd be good.

My biggest obstacle is making some kind of test bench to verify this issue. What would you measure the flow with? Not exactly an autometer or isspro offering...

J
 
I think that is a very good point, CD. I think with more volume, we may get more pressure. I guess I don't know what that will do, but I think balancing may be a better option.

I notice the single housing that I have is offset to the drivers side. Does anyone think that this is an issue?
 
indybeck said:
I think that is a very good point, CD. I think with more volume, we may get more pressure. I guess I don't know what that will do, but I think balancing may be a better option.

I notice the single housing that I have is offset to the drivers side. Does anyone think that this is an issue?
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The offset will not effect your overall flow rates from the heads. Not to worry on that issue.
 
Well then, how does coolant flow through the engine block? Why is the drivers side not getting as much? is the coolant dead heading on the passenger side?
 
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