Engine Mounts, Engine Mounts Options

[Not_A_Six]

Hi All-

New member here. I have the engine out of my '73 2.0 to address some fluid leaks and noticed that the engine mounts were unusual. Going through old paperwork, I found that a PO had installed "Club/Sport" engine mounts 15 years ago.

The car is a '73 with stock side-shift trans and cross bar with the hole in it for the trans linkage. But the engine is mounted to the crossbar with solid aluminum blocks and the crossbar is mounted to the chassis with rubber -- similar to the older style tail shift factory mounts -- instead of the inboard rubber+outboard solid mount expected.

I'm inclined to return it to stock, but I'm trying to understand the purpose of the "Sport" mounts. Online searches suggest that 911 "Sport Mounts" are used somehow for /6 conversions, but I don't know why PO changed from the stock mount with the factory 2L engine/trans.

Thanks for your help.

FWIW, pic of my baby is attached.

[mepstein]

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[SirAndy]

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The 911 "sport mounts" are often used as replacements for 914 transmission (!) mounts.

You really should go back to the correct solid outer mounts on your engine bar and rubber mounts on the front of the engine.
The engine flexes enough under torque that it could very well hit the shift-rod with your current setup.
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[ndfrigi]

here is a sample of 911 sports mounts.

[Not_A_Six]

here is a sample of 911 sports mounts.

Thanks, all.

The mounts in the pic look like the ones on my car, but they're on the *engine*, not the trans. Weird.

Was this maybe a track mod back in the day?

[SirAndy]

Was this maybe a track mod back in the day?

No, see my post above. Your setup makes things worse, especially on the track.
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[Not_A_Six]

Was this maybe a track mod back in the day?

No, see my post above. Your setup makes things worse, especially on the track.
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Thanks. So, are you saying that the engine would move more with the rubber at the ends of the crossbar than it would with the rubber inboard? On which axis? (Pitch? Roll? Yaw?)

I'd guess that it would flex less due to the longer moment arm between the rubber points (unless the outboard rubber is more flexy than the inboard rubber...)

Thanks again. I think I'm gonna return it to stock as you suggested. But, I'm just trying to understand why this mod was ever made in the first place.

[SirAndy]

So, are you saying that the engine would move more with the rubber at the ends of the crossbar than it would with the rubber inboard? On which axis? (Pitch? Roll? Yaw?)

No, i'm saying that with the correct setup (solid outer mounts, rubber engine mounts) the movement of the engine does *not* affect your cross-bar, which is where your shift rod goes through.

With your current setup, the cross-bar moves with the engine under torque load and since the clearances are already tight on the hole for the shift rod, you will have the engine bar hitting the shift rod.

When the shift rod hits the engine bar it makes it very difficult or impossible to shift. This usually happens when you combine g-force with torque. For example, when hitting the gas coming out of a tight corner.
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[SirAndy]

But, I'm just trying to understand why this mod was ever made in the first place.

Ignorance?
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[ndfrigi]

still the better mount for street car.

[Not_A_Six]

No, i'm saying that with the correct setup (solid outer mounts, rubber engine mounts) the movement of the engine does *not* affect your cross-bar, which is where your shift rod goes through.

With your current setup, the cross-bar moves with the engine under torque load and since the clearances are already tight on the hole for the shift rod, you will have the engine bar hitting the shift rod.

When the shift rod hits the engine bar it makes it very difficult or impossible to shift. This usually happens when you combine g-force with torque. For example, when hitting the gas coming out of a tight corner.
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Ahhh! That makes sense. Thanks.

[Not_A_Six]

still the better mount for street car.

That looks like a nice setup. Where did you get those rubber bushings? They don't look like the stock parts.

[rhodyguy]

They're the stock ones for a SS. Outboard mounts are the solid variety.

[SirAndy]

They don't look like the stock parts.

They are the stock rubber mounts for all sideshift 914s.


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[Not_A_Six]

They are the stock rubber mounts for all sideshift 914s.

Thanks. The mold seam in the original pic made it look like it was a two-piece setup. I'm on it if that's just the stock SS part.

Thanks, all.

[Bruce @ 914 Rubber.com]

I agree you should go back to stock. I wonder how they used the early style mounts at the end of the bar. It will drop the engine down. I had a car where they made it work by cutting the height of the engine bar.

[Not_A_Six]

I agree you should go back to stock. I wonder how they used the early style mounts at the end of the bar. It will drop the engine down. I had a car where they made it work by cutting the height of the engine bar.

I dunno. I hope the bar wasn't cut.

Here's a pic of the mount itself. (The bar is buried and I can't get a pic at the moment.)

[ndfrigi]

I agree you should go back to stock. I wonder how they used the early style mounts at the end of the bar. It will drop the engine down. I had a car where they made it work by cutting the height of the engine bar.

I dunno. I hope the bar wasn't cut.

Here's a pic of the mount itself. (The bar is buried and I can't get a pic at the moment.)

914-4 side shift engine mount on the side should be like this. no rubber mount on the side for the engine mount bar to body mount.

[Not_A_Six]

914-4 side shift engine mount on the side should be like this. no rubber mount on the side for the engine mount bar to body mount.

Yep. Thanks. We're on the same page.

[porschetub]

Ditch any crap that's not original,it was well designed system if your rubber mounts are replaced with new stay with that,good luck.