Anyone know about mounting engines, custom propshafts etc?

Anyone know about mounting engines, custom propshafts etc?

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goldar

Original Poster:

550 posts

29 months

Saturday 8th April 2023
quotequote all
Mounting a V8 in a 190e. Lots of chopping to make it fit. I need some advice about driveline angle etc. I'll obviously need a custom prop. OE is a two piece affair with rubber couplings at each end. I'd prefer to go with a single piece with CV joints at each end. But I'm not decided on that yet.

Now what I want to know is how far out can drive angle be? Tolerance for height difference between gearbox output and diff input would be handy to know.

Edited by goldar on Saturday 8th April 20:14

stevieturbo

17,535 posts

254 months

Saturday 8th April 2023
quotequote all
At the end of the day, without massive cutting or work, it will end up whatever angle it ends up.

A CV joint will happily run at higher angles than say a UJ style joint, but some run silly angles without issue.

As for 1 piece or 2 piece, that can come down to whatever is most practical, and assuming the shaft is not too long that "critical " speed becomes a problem for the 1 piece.

Plus using a 2 piece may help with some dodgy angles.

normalbloke

7,714 posts

226 months

Saturday 8th April 2023
quotequote all
Look up prop phasing, pinion angle and it’s relation to the angle of the tail of the gearbox. It’s simple stuff, but easily overlooked.

goldar

Original Poster:

550 posts

29 months

Saturday 8th April 2023
quotequote all
normalbloke said:
Look up prop phasing, pinion angle and it’s relation to the angle of the tail of the gearbox. It’s simple stuff, but easily overlooked.
Thanks. That's all fairly basic.

goldar

Original Poster:

550 posts

29 months

Saturday 8th April 2023
quotequote all
stevieturbo said:
At the end of the day, without massive cutting or work, it will end up whatever angle it ends up.

A CV joint will happily run at higher angles than say a UJ style joint, but some run silly angles without issue.

As for 1 piece or 2 piece, that can come down to whatever is most practical, and assuming the shaft is not too long that "critical " speed becomes a problem for the 1 piece.

Plus using a 2 piece may help with some dodgy angles.
I've already cut out a serious amount to get things where I want them.
There shouldn't be any dodgy angles, but what exactly is a dodgy angle? That's what I want to know.

PhillipM

6,529 posts

196 months

Sunday 9th April 2023
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The less angle the better, but most CV's will be good for 18-20 degrees at least, which is usually overkill for anything but 4x4 offroaders.

stevieturbo

17,535 posts

254 months

Sunday 9th April 2023
quotequote all
goldar said:
I've already cut out a serious amount to get things where I want them.
There shouldn't be any dodgy angles, but what exactly is a dodgy angle? That's what I want to know.
Again depends on application and usage.

Monster trucks would run extreme angles, but likely fairly low rpm's

If it's a racer that will see maybe 9-10,000 shaft rpm, perhaps extreme angles would be a bit silly.

And as already said, angles will be more annoying for a conventional U-Joint, than a CV style joint.

But I'd be surprised if you've managed to build something so bad in a typical car, that the angles would be terrible.

goldar

Original Poster:

550 posts

29 months

Sunday 9th April 2023
quotequote all
No the angles won't be terrible. The gearbox is going higher than the factory position, but I'd be surprised if it was much more than 50mm off centre. I won't be able to measure until it's mounted.