I don't have #4 overheating and I agree with the stock radiator won't stand
pressures above 5PSI for a long time. I changed the radiator to a model of a
cheap german sports car and have plenty of cooling now. To get a better
cooling of #4 you can enlarge the bores of the head behind #4, that will
force the coolant to pass #4 cylinder. I don't run the heater pipe at my
car, no lack of cooling so far.
The figure 8 sealing has a problem with electrical corrosion because it is
aluminium squeezed between cast iron and the wet liner. To avoid this I
prevent the sealing from to get wet. A thick portion of silicon before
installing the 8 sealing and a additional thick portion of silicone after
installing the sealing will cover the complete sealing. After slipping the
liners in no water can reach the sealing or can get through to the oil part
of the engine.
Chris
----- Original Message -----
From: "BOB KRAMER" <rkramer3@austin.rr.com>
To: "Henry Frye" <henry@henryfrye.com>; "Larry Young" <cartravel@pobox.com>;
"FOT" <fot@autox.team.net>
Sent: Monday, March 28, 2005 5:41 AM
Subject: Re: FOT Project Pulley
> I've never had anything but a stock radiator, and I wouldn't trust them at
> higher pressures. I have been running pretty standard stuff, Hepolite
> pistons, and have not had any #4 problems. I have always run the heater
pipe
> around to the back of the head per Ken Gilanders advice. I did get a
little
> water in the overflow bottle after each race. Larry has a big aluminum
> radiator and he was experiencing water in the oil. No doubt that better
> sealing of the figure 8's and head gasket oil interfaces would be in
order,
> but a simple reduction in water pressure reduced the risk of sending water
> into the oil. At least I think that worked for Larry, but I'd better let
him
> answer himself. Larry is bumping up his engine program, and I think he had
> forged pistons last time around. I don't know if he has torn that engine
> down to see if he has anything to worry about. In the meantime, I
listening
> and learning as I will be going for more HP soon.
> Bob Kramer
> rkramer3@austin.rr.com
> ----- Original Message -----
> From: "Henry Frye" <henry@henryfrye.com>
> To: "Larry Young" <cartravel@pobox.com>; "FOT" <fot@autox.team.net>
> Sent: Sunday, March 27, 2005 9:10 PM
> Subject: Re: FOT Project Pulley
>
>
> > At 09:01 AM 03/26/2005 -0600, Larry Young wrote:
> >>However, I've seen problems which I suspected were due to too much block
> >>pressure.
> >
> > You got my interest. What kinds of problems?
> >
> >>I'm hard headed, so it took a while for Kramer to convince me not to run
> >>more than a 7 psi cap.
> >
> > Inquiring minds want to know... Why Bob?
> >
> >>With separate liners that protrude above the block deck, our engines
have
> >>many places to develop leaks at high pressure.
> >
> > The wet liner engine is far from rocket science. Getting the figure 8
> > gaskets and liner protrusion right is the only tricky part.
> >
> >>A better solution is to install a higher capacity radiator.
> >
> > I did that too. A bigger radiator makes a big difference. On a TR4 it is
> > pretty cheap and easy.
> >
> > But without addressing the lousy coolant circulation you are still going
> > get localized overheating. Combine that with really low block pressure
and
> > you get the classic #4 overheat.
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