I run an iron block, ally head Buick 300,9.8:1 CR in my BGT and it runs
cool( a matter of opinion) 190' in traffic or on the road, but the radiator
is 22" x 19" cross flow, RV8 headers and a 3300 CFM puller fan. I use an
"ST" spoiler fully sealed/ducted to the radiator. The front frame rails were
notched & boxed to allow for the radiator.
Try setting the timing back to 6-7' in the hot weather. I actually run
straight water with a can of rust inhibiter/water pump lubricant. Water
Wetter is almost worthless. I have tested it several times and it never made
a measurable difference. It won't hurt anything, however.
Jim Stuart
Reply to <jimbb88@comcast.net>
-----Original Message-----
From: owner-mgb-v8@autox.team.net [mailto:owner-mgb-v8@autox.team.net]On
Behalf Of Bill Zenkus
Sent: Tuesday, July 18, 2006 8:32 AM
To: mgb-v8@autox.team.net
Subject: Re: Running hot under load during hot (90F degrees+) days
Thanks to Bruce, Jim, Ed, David and Don for the great advice.
(I tried to organize the steps from everyone in this email so other listers
would have a good single point reference if struggeling with a heat
problem.)
Jim, the details on my engine - bored .040 over and stroked with a 300
crank for a displacement of 265 c.u. or 4.3 liter. It has a CR of 10:1, is
running a little rich, timing is set for 10 degrees advanced at idle. Runs
great- constant pull from idle to 6500, no pinging or such. The only
timing/jetting indication issue I have is under hard decelleration the
engine pops a little out of the exhause (rich or dwell - I think?)
As many mentioned the need to vent from under the hood, I do have louvers
in the hood just over the back of the exhaust (Yes, block huggers Jim,)
plus 3 inch holes in the fenders directly below the louvers into the wheel
wells.
I will fabricate the duct for the lower radiator, but need to wait until I
get a better front facia. (The air dam I have is NOT vented at all.) I will
get either the LE front spoiler or the air dam with the cutout for the
radiator. (Looking on EBAY now).
Another good point is that I may need a top seal as well, I will check that
clearance and install one if required.
I will cut my coolant ratio down to around 25% and add a water wetter, The
thermostat change to 180 from 160 confuses me but your experience and the
actual results are good enough for me - so I will do this also (second to
last step , next to last step being change out the radiator, after all these
other changes as a last step, if required, I will add the oil cooler)
I will implement all of these recommendations and believe I will resolve my
heat issues soon.
Thanks again for all the great advice and I hope to see you soon at one of
the upcoming meets.
Bill Zenkus
Email: mgb_zenkus@yahoo.com
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