MG Sports Cars

engine swaps and other performance upgrades, plus "factory" and Costello V8s

Go to Thread: Previous•Next
Go to: Forum List•Message List•New Topic•Log In


MGV
Luis Velasco
Peru, IN
(9 posts)

Registered:
04/04/2010 10:44PM

Main British Car:
MGB 1979 3.4L Chevrolet, T-5 BW Transmision

authors avatar
3.4l ENGINE TIMING/OVERHEATING
Posted by: MGV
Date: June 20, 2010 07:09PM

I HAVE A 3.4L CHEVROLET WITH A 390 HOLLEY CARB. I HAVE PROBLEMS TO GET THE TIMING RIGHT.
DO ANY ONE KNOWS WHAT IS THE PROPER TIMING FOR THIS ENGINE? I DO IMAGINE IS SIMILAR THAN THE OLD 2.8L.
ALSO I HAVE A CUSTOM RADIATOR (NEW) IS JUST BIGGER THAN THE ORIGINAL ON THE MGB. I HAVE 7 INCH FANS X2, AND A 12 INCH FAN (PULLER). I STILL HAVE TEMPS OF 225+. THE WATER PUMP IS NEW. ANY HELP.
THANKS


mgb260
Jim Nichols
Sequim,WA
(2465 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: 3.4l ENGINE TIMING/OVERHEATING
Posted by: mgb260
Date: June 20, 2010 08:23PM

Try a 190 degree thermostat. Did you get the right water pump,some are reverse rotation. Does it look like the old one.Burp all the air out of the system. Put aluminum sheet metal around radiator to force all air through radiator. Maybe louvers in hood and/or inner fenders, or bend the back lip at hood to let heat out.For timing 12-14 degrees initial with vacuum disconnected and plugged.If the carb is lean it will run warm also.Oh, and your CAP LOCK is on!



Edited 3 time(s). Last edit at 06/20/2010 08:28PM by mgb260.


MGV
Luis Velasco
Peru, IN
(9 posts)

Registered:
04/04/2010 10:44PM

Main British Car:
MGB 1979 3.4L Chevrolet, T-5 BW Transmision

authors avatar
Re: 3.4l ENGINE TIMING/OVERHEATING
Posted by: MGV
Date: June 20, 2010 11:18PM

My wife told me about the CAPS ON, thanks. The rotation of the pump is correct (CCW). I took the thermostat out.
The timing 12-14 degrees from 12 o'clock clockwise or 3 o'clock CCW.
Thanks.
DSC02936.JPG
Get Your BritishV8 T-shirt by clicking here


Citron
Stephen DeGroat
Lugoff, SC
(367 posts)

Registered:
10/23/2007 09:43PM

Main British Car:
1970 MGBGT V6, 7004R, AC, matching trailer 3.1 liter

Re: 3.4l ENGINE TIMING/OVERHEATING
Posted by: Citron
Date: June 21, 2010 10:58AM

Do not run with out the thermostat. They will overheat. I use a 195 thermo in my 3.1 and have no overheating even with the AC on. I use a mustange radiator.
these engine should be able to run with the stock MG rad if in good shape.
I run my timing at 14 degrees on the street and use 87 octane gas.
I, too have the 390 carb. No change of jets and it runs fine.

Steve


MGV
Luis Velasco
Peru, IN
(9 posts)

Registered:
04/04/2010 10:44PM

Main British Car:
MGB 1979 3.4L Chevrolet, T-5 BW Transmision

authors avatar
Re: 3.4l ENGINE TIMING/OVERHEATING
Posted by: MGV
Date: June 21, 2010 08:44PM

Thanks I will tray.

Luisma


Go to: Forum List•Message List•New User Registration•Log In
Sorry, only registered users may post in this forum.