Bulletproof Rubber Eng/Trans mounts for 3800 swaps

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Sinister Fiero
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Bulletproof Rubber Eng/Trans mounts for 3800 swaps

Post by Sinister Fiero »

Anyone who has driven or rode in a Fiero with a 3800 using poly motor mounts has probably noticed how much vibration is transmitted to the passenger cabin, especially at idle. The problem comes in the design of the 3800's 90 deg V6. The 90 deg V6 is not a naturally balanced engine; firing pulses are not divided up evenly because of the 90 deg spread. 60 deg V6 engines do not suffer from this problem which is why they usually run smoother and don't require balance shafts.

The 3800's balance shaft does a good job cancelling out these vibrations but it isn't very effective at idle speeds. Poly motor/trans mounts are very stiff and transmit a lot of vibration to the vehicle chassis, especially if you are running a solidly mounted cradle, or an 88 chassis which has no cradle bushings at all. Having done a couple of 3800 swaps in 88 Fieros, I have realized the need for an alternative.

In the past, the reason why people have chosen poly over rubber is for the durability factor. The only rubber mounts available were off-the-shelf, OE-replacement versions made for other cars which usually wouldn't fit in a Fiero application. Ones that are small enough to fit usually didn't offer a good level of durability when high engine power levels are thrown into the mix. I have done some research and come up with a new solution using an OE Fiero part... the 1984-87 engine cradle front bushings. These bushings are similar in construction to the popular poly bushings; basically you have a metal sleeve that the mounting bolt goes thru, surrounded by rubber which, in turn, is surrounded by another metal sleeve for mounting purposes. When used like the aformentioned poly bushings as motor mounts, there is no way the internal sleeve can be pulled out of the bushing; at least on the axis the engine/trans is going to apply force to this bushing and the way I have it mounted.

I just finished my latest swap using the all-new rubber cradle bushings as motor and trans mounts. Keep in mind the rubber compound used in these bushings is stiffer than OE stock Fiero motor and trans mount rubber, so it will transmit a little more vibration/noise to the chassis vs. stock Fiero mounts. However, these bushings isolate the engine/trans far better than poly or solid motor or trans mounts.

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So the question is: Are they durable? Well, if you have a 84-87 Fiero, look at your cradle's front bushings. Chances are, they have been in there for 20 years and still haven't pulled apart or failed yet. Sure, they are probably showing signs of cracking and may have become weak over time, but consider their age and exposure to road debris and grime. There is one weakness to using rubber bushings for motor mounts, however. Rubber does not hold up well when exposed to oil or engine fluids. So to say they are bulletproof is true, to the extent assuming they never get bathed in oil. If you have an oil leak occur on the engine or trans and these fluids get on the bushing/mount, then there is a high probability they will fail. Aside from that, I challenge anyone to break one of these.

Right now the only way to get these mounts is to have me make them and install them on your car; which means you will have to bring your car to my shop. I am looking into getting these produced for sale via mail-order, but that is probably going to be some time off because of how busy I am at the moment. However, I just wanted to post this so people know there is now a "more comfortable" alternative to poly mounts out there.
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Kohburn
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Post by Kohburn »

nice quality work - if i was doing a 3800 swap i'd want to buy them for sure - especially to avoid all the drama between the other 3800 mount venders
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Shaun41178(2)
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Post by Shaun41178(2) »

You are always thinking of new ways to improve what already exists. Nice work.
p8ntman442
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Post by p8ntman442 »

I want to have sex with your motor mounts.
"I wanna make a porno starring us. Well, not just us, also these two foreign bitches."
Sinister Fiero
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Post by Sinister Fiero »

p8ntman442 wrote:I want to have sex with your motor mounts.
I was going to post a witty response to this but in the interest of the cleanliness of this forum, I think I will not... Glad to hear you like them tho.
:afrocool:
stimpy
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Post by stimpy »

Sinister Fiero wrote:
p8ntman442 wrote:I want to have sex with your motor mounts.
I was going to post a witty response to this but in the interest of the cleanliness of this forum, I think I will not... Glad to hear you like them tho.
:afrocool:
Cleanliness of this forum? Did you hit your head or something? :scratch:
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Shaun41178(2)
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Post by Shaun41178(2) »

Yea Ryan, knowing that a bunch of kids read this forum and how the moderators like to keep it a family forum so to speak, he didn't want to post anything leud.
p8ntman442
cant get enough of this site!
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Post by p8ntman442 »

fine how about i put it this way, I would like to have the pleasure of losing my VIRGINITY to your motor mounts.
"I wanna make a porno starring us. Well, not just us, also these two foreign bitches."
BigRedDeckSpoiler
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Post by BigRedDeckSpoiler »

OMG!!!
He's channeling Aarong.
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On topic... I've heard good things about Rodney's mounts, if they'll fit your application.
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yellowracer85
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Post by yellowracer85 »

Kohburn wrote:nice quality work - if i was doing a 3800 swap i'd want to buy them for sure - especially to avoid all the drama between the other 3800 mount venders
Theres no drama...Eric nelson dont work here at WCF anymore so what he says to Purple reign is not the words of WCF. I just told a customer to go to him for a motor swap cuz the customer lives in Minn.

And as for Sinister's mount...they look great and im sure they perform well and he done a lot of research to make them, so congrats to him
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