Making the conversion to a 6 cyl, we have several choices to make with mounts, exhaust, fuel, oil tank, engine tin, ....

I recently purchased the OEM mount from Mad Dog, you couldn't ask for a better fit. It nestled into the recess and allowed basically no room for error. I socked it in with a couple self tapping screws and went ahead with the plug and fillet welds.
I removed the paint from the mounting surfaces with paint stripper and cleaned it up with a sanding disc prior to welding

From what I understand the factory placed additional reinforcement in this area. Running the welds for this mount I sensed it the way my MIG was acting. I bet you could pick the entire car up from this mount. Very well done Mad Dog Click to view attachment Click to view attachment

Perfect..

What a great fit, I have his other bulkhead mount. Both are top-notch products.

I just got mine in the mail. Thanks for the photos.. helpful ...

Mine fit like a glove. I did clean the base steel prior to welding. Good luck, give Dave a thumbs up

All the thumbs up go to Mark at Original Customs, he did the design work. I just fabricate them, but thanks all the same!

Disagree Dave,

my vote would give half to Mark and half to Mad Dog. Great product/design

any chance of seeing a few pics 'as received'..... before install ?

Rory - this pic is from the website.

a visit was made.....thank you Mark
and thank you Madog for producing the most logical mount.
now that the repro rubber part is available IMHO this is the best choice

I agree. I purchased this mount for my next car. I just need the two metal plates that support the oem rubber mount.

I personally suggest this mount to all my customers. I probably should just inventory them as its almost a daily request.

Are these other parts necessery / provided / available ?
Requires a high strength bolt too. ( 10.9 , 112mm shouldred shaft, 12 x 1.5 )

yes

I have welded the Mad Dog chassis portion into my conversion project, but the 2.7 is still at the engine builder. Mad Dog states a Wevo mount is required to complete the installation, about $90.

@930cabman

Per previous notes from @mb911

The Wevo mount goes into the 2nd plate with round hole that was supplied with the Maddog mount. Ben seemed happy with the isolation from the Wevo mount.

OEM 914/6 mount eliminates the adapter plate and the wevo mount.

As an automotive engineer that has worked on NVH and highly values low NVH in my own vehicles, I will be using the 914/6 OEM mount for the following reasons

1) Now readily available and only slightly more expensive than the Wevo mount.

2) I don't like the way the Wevo mounts in the secondary adapter made of flat plate. That flat piece of plate steel isn't very stiff in dynamic bending in Z plane relative to the rest of the mount that has lots of form and is directly welded to the chassis. What your really want is a mount structure with at least 10 times more stiffness than the isolator itself. I'm not convinced the steel plate and the Wevo isolator will achieve this goal.

3) The OEM mount has way more rubber for isolation and will have a much lower rate in Z plane than the Wevo mount and will better faciliate meeting the ratio of 10:1 between mount stiffness and isolator stiffness. The result should be much better isolation.

4) Based on the above info, I belive Porsche did their homework and designed the OEM 914/6 mount towards this end. Good isolation in the Z plane without overly compromising X/Y plane that would lead to diminished steering and handling performance.

People have vastly different appreciation for NVH so by no means and I saying the Wevo mount won't mount the engine. I'm sure it will. I also belive it probably does a decent job based on Ben's feedback. However, for reasons above, and my desire for a powertrain mount that is optimized, I belive that is best achieved with the OEM engine mount, and that is what I'll do.

It's great to have an engineers confirmation ! Thank you Superhawk996

The skill for fabricating the chassis part and the engine part is obvious.
Are the two plates to complete the set too much to ask ?
Am I foolish for asking ?

I think mcmark/maddog used and adaptor with the wevo mount because a couple years ago, the oem mounts were not being made, at least not at reasonable pricing. Now uro and porsche have the mounts available as low as $120. It looks like it would be pretty easy to reproduce the two mount plates and like superhawk, I'd like to use the oem rubber mount.

Those plates would be awesome. If I had samples I would have. Bunch made.

I was just going to fabricate my own plates for the 914/6 mount and source the fastener. Not really a big deal.

I totally get why the Wevo mount was the original plan when the 914/6 mount wasn't being reproduced.

@mb911 if you fab them, I'm 1st in line

Rory ?

Hi Guys, with the help of Luke M, we think we will have a viable design to replicate the bottom and top plates that you are discussing....more to follow soon.

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Awesome!

I saw this on ebay.

amazing!

No doubt from my perspective,

This board ROCKS

thanks to all

Well, that was motivation enough to get me to stop procrastinating and actually order the URO mount.

Thanks

Hopefully I can have prototypes to Luke sometime next week so he can compare them to his original top and bottom plates...stay tuned

Just an FYI for those who are gonna shop around for the URO engine mount. There's two styles, one is org style rubber and the other is heavy duty.

Part #'s : 914 375 049 00 and 914 375 049 00 HD


I have both on hand but have not used either one just yet.

Hey thanks for posting the pics of your weld. This is invaluable. I should be starting mine relatively soon and have the same mount.

Now, I currently have the Wevo setup sitting with the mount, I wonder if I should abandon it for the OEM style.

If you'd rather have originals on hand to work from I'm willing to lend them
with your guarantee they be returned.
But....maybe I should know your name first !
PM me and we can work out the details
Rory

@nditiz1

Can always swap it later . Ben posted elsewhere that he was pretty happy with it and that he had set up his car for comfort ride rather than as a track car.

I'm just very picky. The downside of my job is that I used to get paid to do NVH work. Once you learn how to hear and feel some things in tuning a car, you can't un-hear or un-feel them.

I'm the guy that can point out a squeek, or high pitched whistle you've never heard. Or maybe that low frequency vibration you thought was the road . . . but really isn't. From that point on, you'll hear or feel it daily and then it'll drive you mad. I've learned to never point out such things in my friends and family's cars!

Here is what Im thinking for the bottm plate?

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@maddog

Looks pretty good.

Assumed constraints on my part based on what I see:
laser / plasma cut
Welded at seams

Need to be thick enough gauge to avoid "blowout" when the snubbers engage.

From previous picture posted I think this one is showing minor signs of heavy snubbing somwhere in it's past. Not a big deal but would be nice to proactively address it. Still totally functional as-is.

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I was figuring I'd machine them as one-off but I totally get sheetmetal weldment is the way to go to keep price resonable and to match OEM look. Woundn't have any hesitation about your proposal as long as it is as thick as OEM or a tad more.

Have you considered Titanium? . . . . Just kidding.

Hawk, I think the thickness of the bottom plate is about 2.5 mm(.098"), Im going with 12 ga steel which is about .105" thick?

Overall I'd say that is great and pretty comparable.

The 0.007" inch won't net much in terms of increase in stiffness or durability of the snubber. The shape has more to do with stiffness than the slight add of thickness.

Might 11 gauge (0.125") work and/or might be cheaper and easier to obtain?

The downside is don't have parts in front of me to know if that thickness add of another 0.020" causes other problems as part of the overall sytem. I don't think so. I'd rather have a stiffer snubber than one that deflects.

Just my $.02...

This is a great project, and I think it is great for any small six. But I have seen a factory six with a Euro 3.2 in it, and the mount was damaged from the extra torque. We pulled the motor, stop drilled the cracks, and welded in reinforcement to keep it from tearing more. The Porsche engineers who designed this mount were not anticipating something like a 3.6L engine when they built it. So I would use something like this in a six conversion for a small six, up to maybe 3.0L. Anything bigger and I would put in a Rich Johnson mount, or a NaroEscape mount. Using two mount points instead of one is better for high horsepower cars.

Solid advice. In my case I'm putting in a 2.4L No issues.

When you start puting big motors in - you're on your own. Motor mount, transmission, axles, brakes, suspension pick up points, etc. All need to be addressed as a system.

Typical hot rod flaw is to just plop a big motor in and think you're done and that you've actually improved the vehicle.

A little wisdom, experience goes a long way in this case. I would bet the engineers in Stuggart knew how much power their engine mount would accommodate and did not plan on 4 liter beast engines. Some guys are cranking 300+ hp and asking an OEM style mount to hold together. I was considering using a two point mount, but went with the Mad Dog unit. Our 914/6 build will not be abused and never see the track

You can be sure they never planned on 4.0L engines back in the day.

When I lived in Italy back in late 80's the gasoline, road taxes, and insurace costs would have been exorbitant to feed a 4.0L! Would imagine Germany would have been similar.

The 914-8 has a beefed up version of this style mount. Just sayin

Don't a lot of the modern Porsche's use a single engine mounting point? I thought there was a thread discussing it. Maybe McMark's original thread on developing the mount. I remember someone saying the Porsche engines don't twist in the mounts like a Chevy V8 and at least a couple people have used them on their 3.2-3.6 conversions for years. RonS have a six chassis with wide flares and a 3.6 and stock Porsche firewall mount.

I'm using it on my next 3.2 conversion. Thank you to Maddog for making the stock style mounting plates.

Mittelmotor makes the plates.

They are not cheap, but they are nice:

https://www.ebay.com/itm/Auflage-oben-fur-M...1MAAOSwOXRd54sD

https://www.ebay.com/itm/Auflage-unten-fur-...DQAAOSwvFJd543x

Hope these links work.

I picked up a set for my IMSA restoration a while back.

I bought the large bolt required from AutoAtlanta (inexpensive) after not being able to find the specs for it anywhere, although people have since posted them.

John

got the blanks the other day, formed them up, just have to weld them now.

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Very cool. Gonna want a set for sure. I may contact you about inventory on these kits.

Dave is on the case for sure, keep up the good work/service

so not happy with how the first prototype turned out, I did a couple of changes and just ordered a new set of blanks

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