six conversion engine mount choices... Options

[SKL1]

This has probably been beat to death but I have never figured out the search function so here goes...
Finally doing a six conversion on my '71 I've had since new. Did the suspension and brakes way back in the '70's when it was easy to get OEM stuff.
Currently building a 2.4 engine and will be doing a repaint hopefully this summer so will adding an engine mount at that time.
Thinking of a OEM central mount or one like it but also wonder about the Patrick mount which actually looks stronger.
Have at it- +'s and -'s to the choices????

[930cabman]

I have installed this one from Dave: https://maddogsmotorsports.com/shop/ols/pro...ica-motor-mount

Easy to install, IIRC it took a bit of fitting when installing the engine, which is to expected. Time will tell, but I am confident this bridge was well crossed.

The mount welded nicely to the firewall, I sense little if any issues with it.

[brant]

just one person's opinion.....

but when I faced the same question I did a pro and cons list

I too "think" the PMS style should be stronger than factory
it also provides much easier engine service access
by that I mean it can tip

my install included cable, hose, and wiring that would allow me to use the tip feature with minimal disassembly for my application

because of that... I was once able to change out a valve rocker shaft on a jack stands, at a race track... in approximately 30 minutes... and resume the rest of a race weekend

that was an important factor to me that might not apply to everyone
but for that reason I find the PMS mount to be much more service friendly if that is a consideration for your application.

[Root_Werks]

I have installed this one from Dave: https://maddogsmotorsports.com/shop/ols/pro...ica-motor-mount

Easy to install, IIRC it took a bit of fitting when installing the engine, which is to expected. Time will tell, but I am confident this bridge was well crossed.

The mount welded nicely to the firewall, I sense little if any issues with it.

This is the one I used and really like it. I purchased a stock (rubber) engine mount and it all went together like factory.

[technicalninja]

just one person's opinion.....

but when I faced the same question I did a pro and cons list

I too "think" the PMS style should be stronger than factory
it also provides much easier engine service access
by that I mean it can tip

my install included cable, hose, and wiring that would allow me to use the tip feature with minimal disassembly for my application

because of that... I was once able to change out a valve rocker shaft on a jack stands, at a race track... in approximately 30 minutes... and resume the rest of a race weekend

that was an important factor to me that might not apply to everyone
but for that reason I find the PMS mount to be much more service friendly if that is a consideration for your application.

That's a good tip and a nice feature to have!

Now, I'm more interested in the back story of WHY you had to replace a rocker shaft, how you diagnosed that track side, and what the root cause was.
But that is for another thread, not this one...
(IMG:style_emoticons/default/ninja.gif)

[nditiz1]

I also went with the maddog

[Superhawk996]

I too "think" the PMS style should be stronger than factory

I would have to disagree. Through it may look stronger it basically mounts to an area devoid of structure.

It mounts to sheetmetal and mounts below the reinforced Z channel section that the OEM mount attaches to that spans the entire width of the rear bulkhead.

Pictures below show the cutaway of where it mounts to - nothing there.
Green is ZChannel OEM mount structure. Red is where PMS mount.




There very well may be advantages to the Patrick mount for racing. But from an engineering NVH perspective it is going to be inferior. I’d much rather have the OEM mount for a Street car.

The OEM mount is a basically a 3 point (two at trans , 1 centered engine), tuned mass type system that will provide decent isolation and still provide good structure for the engine/trans. The PMS mount is 4 points (2 - one each side of engine , 2 trans) that doesn’t offer much isolation. However as the photos show, there isn’t substantial structure behind the 2 engine points.

[930cabman]

Which is more stable, a three legged chair or a four legged chair.

I went with the OEM style as I am sure the boys in Stuttgart worked this detail out many years ago

When welding the Maddog OEM mount to the chassis, I recall there being extra meat there, based on the feel of my MIG

[Superhawk996]

Go fast racing parts not always better though it makes for great marketing ad copy.

[live free & drive]

These issues are why to consider the "bolt-in" version of the Patrick Motorsport mount. They include some beefy spacers/standoffs that are inserted between the inner and outer firewalls that allow the bolts and spacers to clamp everything together, effectively creating a boxed structure.

Ideally these spacers are welded in and the bracket is both welded and bolted for ultimate strength.

[Front yard mechanic]

(IMG:style_emoticons/default/idea.gif) 325.00 vrs 490.00 (IMG:style_emoticons/default/idea.gif) why do I squeak when I walk

[930cabman]

This has probably been beat to death but I have never figured out the search function so here goes...
Finally doing a six conversion on my '71 I've had since new. Did the suspension and brakes way back in the '70's when it was easy to get OEM stuff.
Currently building a 2.4 engine and will be doing a repaint hopefully this summer so will adding an engine mount at that time.
Thinking of a OEM central mount or one like it but also wonder about the Patrick mount which actually looks stronger.
Have at it- +'s and -'s to the choices????

Just my .02, assuming your '71 model is a solid example, you might want to keep it as close to original and find a different solid mongrel chassis for the /6 conversion.

[dr914@autoatlanta.com]

the dual mount is cheaper, but in germany they make the single mount almost identical to the original factory six that we use for up to 195 HP 2.7 engines

This has probably been beat to death but I have never figured out the search function so here goes...
Finally doing a six conversion on my '71 I've had since new. Did the suspension and brakes way back in the '70's when it was easy to get OEM stuff.
Currently building a 2.4 engine and will be doing a repaint hopefully this summer so will adding an engine mount at that time.
Thinking of a OEM central mount or one like it but also wonder about the Patrick mount which actually looks stronger.
Have at it- +'s and -'s to the choices????

[infraredcalvin]

My six with factory mounts holds a 3.4 and a 915 just fine, easy to remove and replace engine by myself. I have a nano escape mount (very similar to the PMS mount) that i was planning to use on my conversion 6 racecar build. Except for the convenience Brant mentions above, i’m considering not installing and going back to the original 6 style mount for consistency of replacement parts (swap-ability in a pinch) across my cars, and as i mentioned it’s plenty strong for my -6.

[Retroracer]

FWIW I went with the Maddog mount. Very happy with it:

- lots of area to weld to the bulkhead, so loads are spread nicely
- 3 mounting points vs. 4: the 911 used 4 mounts, so there's that
- basically halves the stress on the sports mounts (vs. a single front mount)
- the double mounts help spread rotational stress between the fronts and rear (trans ears) supports; single front mount relies on the trans ears (magnesium) to manage this, the Maddog engine support is made from Scottish girders (I think)

Depends on how original you want it to look - and how much motor you expect to run?

2c.

- Tony

[mb911]

Factory style for the win. I get to work with many conversion folks and can share from experience that the OEM style does everything really well- clear shift linkages easily, clear heat exchangers easily, sets to factory height easily, requires the least modification to the car.

If you have any questions about the maddog mounts I sell them all the time and can answer most questions

[mepstein]

Maddog has two mounts. The shelf style with two rubber mounts or the oem style with one large mount. Both are nice but I’m going with the oem style for my next conversion. The less expensive “shelf” version might not allow you to run a pressure regulator. I currently have a Naro mount on my 3.2 car. While it works, I would not use it again for a street car. The geometry isn’t right to make the sheet metal sit flush.

I have read every six conversion thread out there. I have a feeling that they all work fine, are all strong enough no matter where they are mounted and ultimately, the choice is more about personal preference than any real performance issues.

Edit - I just saw Ben’s post. He’s done a bunch of conversions. I would listen to him.

[davehg]

Went with the Rich Johnston mount, same with his throttle linkage too. High quality and looks factory.

[SirAndy]

(IMG:http://www.914world.com/bbs2/uploads/post-179-1165172769.jpg)

[mlindner]

I installed this type. Forgot who I bought it from but went in well, both bolted and welded. And a very easy engine install. Best, Mark