I have heard of engines running cooler after break in, and it certainly
seems feasible, but I have never noticed it myself.
One other thing that you may not have checked is whether or not the radiator
cap is still the high point in the system, and are there any other local
high spots that may still have air in them? On the RBB cars the line from
rad to tank will purge any air in the system since there are no other local
high points to worry about. The heater being the notable exception but that
doesn't affect running temps. With the shape of the A that may no longer be
the case.
On my V8 the surge tank is the high point, but there is a local high point
at the thermostat neck and it wouldn't purge the air from above the
thermostat. The solution, thanks to Jim Stuart, was to fit a 1/8 pipe
fitting into the top of the thermostat neck and fit a small hose from there
to the surge tank so that any trapped air would be purged from the neck. If
air is ever reintroduced from coolant loss, it repurges itself once coolant
level is corrected.
Hope this helps,
James Nazarian
71 MGBGT V8
71 MGB Tourer
-----Original Message-----
From: owner-mgs@autox.team.net [mailto:owner-mgs@autox.team.net] On Behalf
Of Danny Varnado
Sent: Thursday, June 10, 2004 10:41 PM
To: MG List
Subject: Fw: MGA running temp.
----- Original Message -----
From: "Danny Varnado" <dannyvarnado@cox.net>
To: "justbrits" <justbrits@comcast.net>
Sent: Thursday, June 10, 2004 9:26 PM
Subject: Re: MGA running temp.
> A little history, I've recently finnished a ground up rebuild of the
MGA."74
> engine bored 20 over, mild street cam, Crane electronic ignition, Weber
down
> draft, OD transmission, new radiator w/ overflow tank & 10lb. cap. The
> engine run like a top.
> When I first took it out on the road the temp was approching 220F. I
> checked all of the obvious things: timming, mixture, gauge (stock), hoses,
> belt tension, fan rotation. All checked out OK. I moved the oil cooler
> under the car and blocked all air passages around the radiator. No change.
> I pulled out the t-stat and installed a blanking sleeve. This is the only
> thing that helped. Temp dropped from 220 to 212 on the open hiway w/ no
> traffic. Still seems a little hot to me. It's not pushing any water (
50/50
> mix) out of the overflow tank.. Maybe it will cool down a little when the
> engine gets broke in. Any suggestions greatly appreciated.----
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