Is my GT Engine supposed to be tilted?

[opelgt73]

Originally Posted by GTJIM The left and right GT engine mounts ARE different and the motor is suposed to be on an angle - have a look at the gearbox mount bracket too.

HMMMM.... I never noticed that. I have done a few motors and must have been lucky. Or it didn't matter. Either way it seems you could swap them and get slightly more clearance for say a pair of webers, because it would move the motor towards the driver side. I don't think it would rotate the motor that drasticly either. The only interferience I can think of is if you are using the stock fan shroud.


EDIT: after thinking about it, the motor would move to the drivers side and up ever so slightly, but there would be no rotation.

[petrieopel]

I'm running dual 40DCOE's and I'm trying to get a 5 degree angle for my webers. With the engine tilting so much the Webers are tilting downward. I've attached a photo from a Weber Carburetor book showing what I'm talking about. I've had to add a spacer under the passenger side motor mount to achieve this.
Trent

[petrieopel]

I forgot the attachment. Here it is for the thread above.
Trent

[matl59]

Is the engine mount with the hole closest to the edge for the right side? If it is then I just put them in wrong

[soybean]

Originally Posted by matl59 Is the engine mount with the hole closest to the edge for the right side? If it is then I just put them in wrong

The first picture in my post above is as it sets in the car. You'd be in the drivers seat looking forward. The hole that I think you are talking about is for the clutch cable. Have you got your clutch, etc in? Jarrell

[tekenaar]

Originally Posted by opelgt73 HMMMM.... I never noticed that. I have done a few motors and must have been lucky. Or it didn't matter. Either way it seems you could swap them and get slightly more clearance for say a pair of webers, because it would move the motor towards the driver side. I don't think it would rotate the motor that drasticly either. The only interferience I can think of is if you are using the stock fan shroud. EDIT: after thinking about it, the motor would move to the drivers side and up ever so slightly, but there would be no rotation.

Had you considered the crank axis shift due to swapping engine mount brackets from side to side?

[opelgt73]

Originally Posted by tekenaar Had you considered the crank axis shift due to swapping engine mount brackets from side to side?

Crank axis shift? With respect to what? The trans will move over with the motor, and probably not cause any undue stress to the trans mount as the deflection at that point would be minimal (if you consider the yoke the axis of rotation), much smaller than say the normal operating vibration.

[tekenaar]

Originally Posted by opelgt73 Crank axis shift? With respect to what? The trans will move over with the motor, and probably not cause any undue stress to the trans mount as the deflection at that point would be minimal (if you consider the yoke the axis of rotation), much smaller than say the normal operating vibration.

The slight shift in driveline angle wouldn't hurt anything on a stock or slightly modified car perhaps, granted, but I wouldn't recommend this in a race car . . . it's the little things like this that set the winners apart from the also-rans. FSM cautions about engine bracket difference, BTW.

[matl59]

I was refering to the brackets that GTJIM posted a picture of earlier in this post that bolt to the motor and then to the rubber mounts. Which one is for what side?

[GTJIM]

I have one GT motor and I took the brackets off to paint them ....... really would like to know which one goes on what side myself.
Think the brackets must be a bit "off-square" to allow for the engine tilt so guess that by checking the brackets with a square it should be obvious - I 'll try that next. RATS!

[hrcollinsjr]

The mounts are the same! I believe the only difference in the engine brackets is the location of the motor mount hole. Now if I could just remember which one is which. If installed incorrectly I would thing there would be a clearance problem.

Harold

[tekenaar]

Originally Posted by hrcollinsjr The mounts are the same! I believe the only difference in the engine brackets is the location of the motor mount hole. Now if I could just remember which one is which. If installed incorrectly I would think there would be a clearance problem. Harold

Just went and measured two of my GTs. Contrary to what I expected, left, driver-side bracket measures 3" between bracket-to-block mounting face and center of hole while right, passenger-side bracket measures 3.25" between bracket-to-block mounting face and center of hole.

[baz]

if the engine is not mounted in the correct plane the drive shaft output will not be on the same angle both in vertical and horizontal planes , this will result in wear on the hardy splicers (the 2 universal joints ) in the prop and result in a failure of said joints ,they are made to work in a straight line and when they need to off set they can only do this i 1 plane not 2 as it twists the bearings inside and stresses the yokes
it normally takes me a week when fitting a different engine to be happy that i have both output face and axle face exactly right
if the nearest i can get the output face to vertical is say 5° from vertical then the input to the diff or torque tube has to be 5° to match ,only this way will the prop last and take heavy use without brakeage

[tekenaar]

Originally Posted by baz if the engine is not mounted in the correct plane the drive shaft output will not be on the same angle both in vertical and horizontal planes , this will result in wear on the hardy splicers (the 2 universal joints ) in the prop and result in a failure of said joints ,they are made to work in a straight line and when they need to off set they can only do this i 1 plane not 2 as it twists the bearings inside and stresses the yokes it normally takes me a week when fitting a different engine to be happy that i have both output face and axle face exactly right if the nearest i can get the output face to vertical is say 5° from vertical then the input to the diff or torque tube has to be 5° to match ,only this way will the prop last and take heavy use without brakeage

Well said and . . . correctamundo! Basically what I was trying to alert everyone to in my post #31.

[matl59]

figures, that means mine are in wrong. Can anyone else confirm that the engine block mounting face to the center of the hole is in fact 3 inches on the drivers side mount bracket??

[petrieopel]

My drivers side bracket measures 3.40" center of the hole to the block where the bracket attaches.

[greensmurf20]

if memory is serving me well today, i seem to remember that the driver side engine mount bracket has a part of it machined flat for the battery cable holder (lack of better terms on so little sleep). i should go in the garage and look but too lazy. but i think theres a flat machined part on the drivers side braket where the hole is drilled for the engine mount stud, and is only present on drivers side, not pax side.

[GTJIM]

Here is a picture of a LHSide (Drivers side!) GT engine mount bracket. The hole is closest to the block on this one and further away on the passengers (RH) side. The brackets are "square" so any angle must be taken up by the rubber damper. So the GT engine is moved to the left - but leant over to the right side. I think this was mainly done for carburettor clearance, so standing the engine back up square and moving it as far left as possible should give more room for twin side draft Webers .... food for thought!