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Re: FOT Project Pulley

To: "Henry Frye" <henry@henryfrye.com>, "Bill Babcock" <BillB@bnj.com>,
Subject: Re: FOT Project Pulley
From: "kas kastner" <kaskas@cox.net>
Date: Sun, 27 Mar 2005 14:27:36 -0800
Glad to see so many folks paying attention to the block pressure issue. Pays
off.
  ----- Original Message -----
  From: Henry Frye
  To: Bill Babcock ; fot@autox.team.net
  Sent: Sunday, March 27, 2005 1:21 PM
  Subject: RE: FOT Project Pulley


  At 06:22 AM 03/26/2005 -0800, Bill Babcock wrote:
  >I thought about that, it's why I think it will take some testing. I
suspect
  >that at higher RPM the pump isn't increasing pressure linearly, there's
such
  >a big range of RPM that it operates over. There's a good chance the block
  >pressure wouldn't change. The easy way to find out would be to put a gauge
  >on the block and try it.

  I run one of Ken's super-duper water pumps, it's last years impeller
  design, and I have done some mods to the water passages in the head. I run
  a coolant pressure gauge, tapped off the back of the block where the stock
  drain is. I find the increase of pressure is absolutely linear. With the
  thermostat in place I have pinned a 35psi gauge. With a blanking plate in I
  do not go over 30. These readings are at the end of straights, so figure
  5500 to 6500RPM. I have not looked while winding out to 7000. Next time on
  the dyno I will. I have replaced the 35psi gauge with one with a higher
limit.

  I have never filled my overflow tank, so my 16 lb cap is holding fine. I
  was worried when I removed the thermostat, but no problems.

  After looking at my pistons right out of the motor, there was no way to
  tell which one was #4. They all looked the same. I never had that before
  increasing the block pressure.

  I am a strong proponent of raising the coolant pressure, I think it does
  wonders to cool the engine more uniformly. Extracting heat is important...

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