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Which Brand HO Pump?

Acesneights1 said:
those egts are fine. I was easily hitting 1300+ if I kept my foot in it. I am seriously considering fixing the vac pump and putting the stock tune back in. Truck was much better stock. Less power but ran much cooler.
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Something's wrong, then. I find it hard to get any sort of significant EGTs, now that I have Heath's EPROM. I could see 1250, post turbo before. Now, I'm "lucky" to see 950 unless I am really hammering it on a hill. I've got a tow coming up on Labor Day weekend where I'll be loaded down a little with a slide-in camper and trailer with two ATVs in southern Ohio where we have hills for long stretches. I won't be grossing much, but I'll be able to see, again, what the EGTs do on a long stretch. This will be my first run with the full Balance Flow system in place.
 
SnowDrift said:
This will be my first run with the full Balance Flow system in place.
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I will be interested in what your results are.

By balance flow, are you meaning the full Heath system? Or did you use a HO pump from a different source? If so, what year is the pump for?

Don
 
full stock 1995 single t-stat system. OEM t-stat (new) and new radiator. I have no cooling issues, though, even when towing really heavy. I simply installed the Balance Flow system to try to prevent future problems because of the unbalanced factory system.

Yes, it's a complete Heath Balance Flow system. I had bought the crossover years back when mine got a broken ear tab and recently bought the remainder of the system used from another member here.
 
SnowDrift said:
full stock 1995 single t-stat system. OEM t-stat (new) and new radiator. I have no cooling issues, though, even when towing really heavy. I simply installed the Balance Flow system to try to prevent future problems because of the unbalanced factory system.

Yes, it's a complete Heath Balance Flow system. I had bought the crossover years back when mine got a broken ear tab and recently bought the remainder of the system used from another member here.
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It looks easy enough to replicate but what is in the can that joins the heater hoses ?
 
They're not selling them anymore, to my knowledge. The system is effective, but is not as good as the current kit they're selling with the new pump and clutch. The idea is to get the flow up in the passenger side head and the Balance flow kit did that, but the water pump they introduced, recently, does a slightly better job. I had a long conversation with Bill about it last week and didn't come away from it feeling bad about having his original kit on the engine. If I ever get to where I need a water pump, though, I'll swing for his whole kit he's selling now and remove the Balance Flow.

I couldn't look down into the can, really. The hoses are clamped/crimped on it when it came to me. Hoses are already cut to length and installed upon arrival. I think though, the can is just a transition area to bring the two lines together. I had thought to fab up my own, as well, but gave up after I priced some fittings and such I wanted to use. Similar ideas have been put together and may be close to the same effectiveness. Again, I had zero cooling issues before the kit, but just installed it for peace of mind on the coolant moving through the rear most cylinders.
 
vail426 said:
Tried to find a picture, but no dice. I did not see it offered at Heath's store.
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Balance Flow Pic.jpg

I've always wondered why Heath gave up on the "Balance Flow".....It is now being offered to the Hummer crowd thru one of those H1/Off road/4X4 product sites.
 
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I would say there is nothing in the can. Just a junction. Snowdrift, what water pump was just introduced? I thought the GM 88894035 water pump was the big daddy as far as equal flow is concerned.
 
No idea on the part number. I just know Bill mentioned to me that they finally have a water pump with the flow characteristics they've been looking for since the 6.2 diesel.
 
This is from Bill's store. He must be talking about the number I mentioned.

NOTE: For the more demanding towing conditions, consider our Extra Heavy-Duty Cooling System upgrade. This kit includes GM's latest design, high flow water pump, Extra heavy duty fan clutch, 21" 9-blade composite fan, correct thermostat(s) and all necessary gaskets.

This is quoted from Maxxtorque mag

"Where the flow rate on the passenger-side had been a paltry 22 GPM with the ’97 high volume flange type pump, the 88804035 pump provided 48 GPM!"

This must mean that the best pump has the spin on fan, so anyone with an older truck has to spend big jing to upgrade( pump, clutch and fan).
 
Myself, I think you have a defective fan clutch or bad water pump moving very little water. My Dmax fan runs with the low out pump. It is on the to replace list. Autozone HO pumps do the job.

The balance issue is on the low output water pumps especially the 1995 model year Heath measured. The spin on pumps have a larger flow path on one side to fix the issue. HO pumps appear to have this issue, in 4 bolt editions.

However, a Kennedy low temp fan clutch, 180 T stat, and 9 blade steel fan will keep you below or at 210 with everything a DB2 and 13 PSI of boost can throw at it pulling to Payson in altitude or Phoenix high 110+ temps. The heath spin on system can improve this.
 
buddy said:
Did Heath ever say the 90gph water pumps had an imbalance issue? Or just the high ouptut ones? He uses the 90gph on his racer truck.
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The older ones sucked. You could make the temp gauge swing with the pyro, one thing about it, if you kept it below 210ºF, you didn't really have to worry about EGT's as much. They had a big difference side to side, I've seen as much as 30ºF difference(turbo side hotter).

I wish someone would compare the 97-99HO pump with the 2000 pump side by side. I really dont think there any different besides the thread on hub, aftermarket pumps anyway(why make two housings?).

I have the 97-99HO pumps on all three of mine. Under stock fueling I had to really beat on my 92 to get it over 210ºF, with the stock water pump I could put it past 210ºF at will within about 10-15 seconds pulling a load.

My 93 has got a temp gauge in each head, most of the time with the HO pump(aftermarket) the turbo side is the 0-5ºF cooler than the drivers side. If you beat on it, it may get 5ºF hotter than the drivers side, I can live with a 5ºF side to side, thats balanced enough.

With trucks with more fuel than stock I will agree that more than the 130gph HO pump flow is needed. I never got to try my dual thermostat housing on my 93(broke the crank, damn dorman pulley), but with the single 195ºF A/C delco stat I've seen 150ºF rear head temps and 240ºF coming out the front if really beating on it, just not enough flow through the heads.
 
The 99 1/2 up trucks have the balanced water pump. There must be something different in the design. I was able to find pictures of the backsides of older and late pumps, but I could see no difference. I don't think this would just be a marketing issue to sell a "better" pump. There has to be something changed on the late pumps. I would like to know precisely what it is.
 
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