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MG MGB GT V8 Factory Originals Technical - engine angle question

Guys, here is a question regarding engine mounting angles. I know to enure longevity of prop shaft universals that the engine should mount on the same angle relative to the rear axle. My question is what is this angle in an MGB and am I right in assuming the correct point on the engine to measure this angle is the engine deck or the tappet flange on the heads? Also does it matter that the carby is on a different angle relative to the block?
leighton

Shouldn't be as straight a line as possible through the gearbox output shaft, propshaft, and axle input shaft? http://www.drivetrain.com/driveline_angle_problem.html might help.
Paul Hunt

The carburetor should sit (about) level with the ground when the weight of the car is on the wheels. The intake manifold should already be "wedged" about 3 degrees allowing the engine centerline to point down by that amount front to rear. Electronic fuel injection doesn't much care about that but you should maintain about the same angle so that the oil level isn't up on the crank seals.

If you are drag racing, you can play with different carb angles due to varying fuel levels under high acceleration.

Wayne
Wayne Pearson

http://www.5speedtransmissions.com/driveline_angles.html
Glenn Kendall

So as I see it, the crankshaft centre line needs to be parrallel to the centre line of the diff in both planes, right?
thanks
leighton
Leighton

I think it is engine and rear axle within 3* of parrallel that is the rule of thumb??

Just remember you can buy wedges to change the angle of the rear axle if needed.
Larry Embrey

Nope. Centerlines parallel within about 1/2 degree and U-joints operating at about 3 degrees with 5 degrees about max.

Wayne
Wayne Pearson

IKNEW there was a 3* in there someplace!!! Thanks Wayne.
Larry Embrey

Gents,
Dan Masters wrote an excellent article on pinion angle in the January - April 2002 edition of the British V8 Newsletter.
http://www.britishv8.org/index2.htm
The backissues of this newsletter are available online (or by snailmail) and still remain an informative resource for conversion information.
Graham Creswick

Sort of related but more concerned with engine cooling than uni joints is the fact most engines are inclined to help water flow within the block and assist in venting any air trapped there in.

The usual engle is slight but is around 3 to 5 degrees "up bubble" (ie with the engine installed the crankshaft inclines toward the front of the car).

This may help someone.

Cheers, Pete.
Peter Thomas

This thread was discussed between 10/12/2003 and 20/12/2003

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