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Old 11-12-2004, 23:24   #1 (permalink)
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Engine Mount Sizes?

Just wondering if anyone can tell me what sizes V8 engine mounts are available? Currently stock mounts on an XD.

I'm looking at lowering the engine about 2.5 to 3cm. This will then pivot the engine/gearbox line down and straighten out the 5* kink I have at my front uni-joint.

I can't see any parts that would get in the way with the lowering. Any other gotchyas? And it's OK to jack the motor up using the sump?

Thanks
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Old 11-13-2004, 00:40   #2 (permalink)
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Re: Engine Mount Sizes?

The XY style chassis to engine mount plates are slightly lower than the later ones. The mount holes are not all in same position though.

All cleveland rubber mounts are same dimension to my knowledge.

Uni joints need to run an angle to survive in service. I cannot quote angles of the top of my head though. Too much or too little both destroy them.

Don't jack the motor of the sump as you will crush it.
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Old 11-13-2004, 02:02   #3 (permalink)
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Re: Engine Mount Sizes?

Thanks.

Yeah, about 2* is good, 3* max. Mine's a little over 5* at present and is not ideal under high load and speed.

What's the best way to support the motor without one of those mobile hoist cranes? One mount at a time or both?
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Old 11-13-2004, 02:51   #4 (permalink)
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Re: Engine Mount Sizes?

I would do it one mount at a time with a piece of wood profiled to sit on the sump rail of the engine block. Assume when doing things like this that it could drop down so be very careful of those fingers.

Would spacers under the rear mount (gearbox) help?
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Old 11-13-2004, 03:20   #5 (permalink)
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Re: Engine Mount Sizes?

I've calculated that I need to put a 4cm spacer under the gearbox mount to raise the transmission/engine axis from 5* down to 2.5*. The engine mounts (pivot point) are 900mm forward from the trans mount.

Problems with only doing the gearbox spacer: I have 3cm clearance between headers and gearbox crossmember, the driveshaft is about 3cm away and the top of the gearbox is 1cm from the trans tunnel (want to avoid major surgery).

So if I could drop the engine 2.5cm (1 inch) and fit a 1.5cm block of metal under the trans mount I'm in business.

I sold my toploder without checking, but I'm thinking the mounts may be higher on the extension housing of the Tremec (which lowers it).

Thanks for the tips.
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Old 11-13-2004, 03:51   #6 (permalink)
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Re: Engine Mount Sizes?

well i'd say that you could make a custom engine mount by cutting out some of the rubber material in the standard mount, but joining the two halves back together would be the tricky part, i have heard of people putting bolts through the engine mounts to strangthen them for racing purposes, not sure how how legal you would go but its worth considering
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Old 11-13-2004, 04:05   #7 (permalink)
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Re: Engine Mount Sizes?

one concern would be the clearance of the sump and crossmember. I haven't really looked with this in mind but I don't think you will get a lot of lowering before running into hassles.

edit: dumb question already answered
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Old 11-13-2004, 06:07   #8 (permalink)
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Re: Engine Mount Sizes?

Quote:
Originally Posted by TruBlu351
Thanks.

Yeah, about 2* is good, 3* max. Mine's a little over 5* at present and is not ideal under high load and speed.

What's the best way to support the motor without one of those mobile hoist cranes? One mount at a time or both?
How did you measure it Tru-Blu? I had to use a 12mm spacer plate to lower my gearbox x-member in order to lower my gearbox for clearance I needed between the box and a trans tunnel recess I put in for the shifter. This increased to angle of the uni-joints and I would like to see if it excessive.
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Old 11-13-2004, 07:59   #9 (permalink)
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Re: Engine Mount Sizes?

Quote:
Originally Posted by STROKEXD
How did you measure it Tru-Blu? I had to use a 12mm spacer plate to lower my gearbox x-member in order to lower my gearbox for clearance I needed between the box and a trans tunnel recess I put in for the shifter. This increased to angle of the uni-joints and I would like to see if it excessive.
I dropped into "Truckline", 27 Kewdale Rd, Welshpool, ph: 9353 4288. They specialise in trucks, but do a lot of driveline geometry work. I'll be getting them to build my new driveshaft, hopefully next week. Also mentioned putting solid uni's in too (no grease nipple), supposedly bullet proof, never heard of them, I guess they have sealed roller bearings.

Brenx should try some!

Drive over the pits and they guy has a small handheld electronic spirit level. He measures the angle on the diff pinion and gearbox. Takes 2 minutes. I was surprised how many places don't do these measurements.

* For every 15mm you raise/lower your crossmember you'll change the front uni angle by 1 degree.

I'll check the sump clearance tomorrow.
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Old 11-13-2004, 08:43   #10 (permalink)
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Re: Engine Mount Sizes?

Anyone got a spare toploader lying around?

The Tremec measures 57mm from the CENTRE of the output shaft down to the flat face of the crossmember mount.

Just curious to see if any different.
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