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 Post subject:
PostPosted: Fri Dec 25, 2009 9:59 pm 
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Turbo Slant 6
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Joined: Wed Apr 30, 2003 6:43 pm
Posts: 976
Location: SoCal
Car Model: Toad Wagon
Quote:
Under what phase of engine operation would you not want to run the water pump? Post-running cool down would be a good time to have it on, but I can't think of a good time at all to have it off.
Getting'er up to temp quickly when you get caught starting your class at the front of the lanes after too long a wait like an oil down (typically still slamming your bucket & straps on as well). :lol:

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Last edited by Old6rodder on Fri Dec 25, 2009 10:02 pm, edited 1 time in total.

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PostPosted: Fri Dec 25, 2009 10:01 pm 
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Supercharged
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Location: Portland-ish
Car Model: Fiat 500e
That gets the head warm, but what about the cylinders?

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PostPosted: Fri Dec 25, 2009 10:04 pm 
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Turbo Slant 6
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Joined: Wed Apr 30, 2003 6:43 pm
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Location: SoCal
Car Model: Toad Wagon
Sometimes you just have to roll with what you can manage. Folks tend to get testy when you add to a delay, starter folks in particular. :lol:

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PostPosted: Sat Dec 26, 2009 6:14 am 
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Turbo EFI
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Joined: Mon Jul 14, 2003 10:02 am
Posts: 1817
Location: Southeastern Pennsylvania
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I have used a Mercedes 16" pusher on my cars with great success.
As soon as I can find another one it will be in my Volare. They are easy to mount and wire.

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PostPosted: Sat Dec 26, 2009 7:26 am 
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Joined: Fri Nov 08, 2002 4:48 pm
Posts: 5835
Location: Burton BC canada
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Im with Dick on the quick warm up .....I want the heads hot enough to run nicely and the thermostat to open quickly. (non slant mudbogger)

As soon as it cleans out and will idle I turn on the pump.....as soon as the Tsat opens I turn on the fan.

On really hot days when the class runs back to back reverse order and I am the last guy first run and #1 on the 2nd run....the pump and fan will run the whole time between runs.

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PostPosted: Sat Dec 26, 2009 7:35 am 
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Joined: Thu Oct 17, 2002 7:27 pm
Posts: 14463
Location: Park Forest, Illinoisy
Car Model: 68 Valiant
I have an electric pump/fan drive on the red car. I have made passes with it turned off and never cooked anything. It's not a good practice though.

I usually let it run 5 minutes or so back in the pits if we will run again soon.

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PostPosted: Sat Dec 26, 2009 7:43 am 
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3 Deuce Weber

Joined: Mon Jun 07, 2004 9:43 am
Posts: 91
Location: Sunny SoCal
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Quote:
Quote:
Belts are power hogs, but are much more reliable for the long haul.

CJ
I was thinking the same thing. Toothed belts require much less tension and require less power to drive. I expect to change the race car's V-belt water pump drive to a toothed belt. It will also then match the oil pump drive. Both the water pump and oil pump will turn about 1/2 crankshaft speed.

Also, how is an electric water pump preventing hot spots when it's switched off?
The Davies Craig pump doesn't use a belt at all. It is mounted in-line at the lower radiator hose. Then you remove the belt from the mech pump and remove the thermostat. When used with the digital controller, you set the temp with the controller. It keeps the water pump running for two minutes after shut down, same as the electric fan's controller does. During warm up, it only pulses the pump on and off to allow a quicker warm up.

-Moose

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PostPosted: Sat Dec 26, 2009 8:13 am 
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Joined: Mon Mar 31, 2003 1:04 pm
Posts: 7413
Location: Oregon
Car Model: 2023 Eichman Digger?
Quote:
The Davies Craig pump doesn't use a belt at all. It is mounted in-line at the lower radiator hose.
-Moose
Sounds like the cat's pajamas. If you are willing to take the risk of failure out on the road, go for it.

For a street car, I would not choose to run an electric pump. It is an additional failure point, an additional electrical load and adds a break to the cooling system hoses. A failure point.

It is not going to net much economy running at normal cruise with the engine configuration we have.

Be great for you to prove me wrong. Just carry a spare if your heading cross country. :wink:

CJ

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PostPosted: Sat Dec 26, 2009 10:16 am 
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3 Deuce Weber

Joined: Mon Jun 07, 2004 9:43 am
Posts: 91
Location: Sunny SoCal
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Quote:
If you are willing to take the risk of failure out on the road, go for it. It is not going to net much economy running at normal cruise with the engine configuration we have.

Be great for you to prove me wrong. Just carry a spare if your heading cross country. :wink:
Well, this pump really isn't going to work for the typical /6er, just because of the cost (which eliminates economy). You're right, probably won't net much HP gains for my use, either. But, I got a sweet deal on one, so I decided to give it a try. Since the original poster asked about electric pumps, I wanted to point out that there is a feasibility.

-Moose

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 Post subject:
PostPosted: Sat Dec 26, 2009 12:22 pm 
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Joined: Sat Nov 02, 2002 7:52 pm
Posts: 1491
Location: San Antonio, Texas
Car Model: 1964 Valiant
I would rather have a serpentine belt system on a slant
six.

I think electric water pumps might eventually be common
in production cars. I had a Toyota that broke the pump belt
but I drove that car to the parts store without the water
temperature rising, then all the way home as the pump was
locked up. I don't think some motors require much of a
water pump and it could have variable speed.


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 Post subject:
PostPosted: Sat Dec 26, 2009 3:17 pm 
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Board Sponsor & Moderator
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Joined: Thu Oct 17, 2002 7:27 pm
Posts: 14463
Location: Park Forest, Illinoisy
Car Model: 68 Valiant
My Dad's tractor and many other early industrial motors did not have a water pump at all. They just had a huge radiator and fan. Water circulated by convection. :shock:

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