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HOW-TO mount your 3800 in a Fiero using rubber mounts...

 
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Darth Fiero
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Joined: 31 Jul 2003
Posts: 140
Location: Fort Wayne, Indiana

PostPosted: Mon Aug 25, 2003 9:17 pm    Post subject: HOW-TO mount your 3800 in a Fiero using rubber mounts... Reply with quote
I have had a few questions as to what I am doing for mounts. I have heard that a few people are poly or solid mounting their engines to their cradles and are happy with the results. While I think the 3800 is one of the smoothest running 90 degree V6's available, it still is not perfect by any stretch of the imagination, especially around 650 RPM idle.
While some like to pray to the poly and aluminum gods, I myself am an abid fan of "factory" available parts. While custom mounts look fancy, I do not admire their replacement cost and availability attributes.

In any event, I am using factory available stock transmission mounts on the drivers side of the 4T60-E. The only modification that was needed was the enlongation of the holes in the cradle to allow the trans to side to the driver's side ever so slightly.

For the single bottom/front engine mount, here is what I have:



The rubber mounts are from a 75 Dodge Truck with a 318 V8. They retail for less than $5 each. They feature an offset stud on the top and bottom. I am using the aluminum A/C compressor bracket from an 88 Buick Lesabre 3800 engine which already has some extra meat cast into it to facilatate the mount bolting locations. This bracket will need to be modified slightly (ground on) so it will bolt to the series II block but it is no big deal. Most of these brackets don't have holes drilled in them but even if they are already there you might have to enlarge or drill new ones so you can position your mounts correctly. Some of the casting was a little too thick for the studs on the mounts but a little grinding of the bracket fixed this. The bottom piece was fabricated from 1/4" steel plate and 1x1" mild steel box tubing. This gave me the proper mounting height of the engine I needed. Obviously, you could use smaller stuff and make the engine sit a little lower but the CV axles tend to get really close to the cradle so I elected to keep it as low as I felt comfortable with which still allowed me room to level the drivetrain out.

Next, you will see what I did with the rear passenger side transmission mount:



Here I used the same Dodge truck mounts but welded a plate to the bottom of a 95 bonneville doggy bone mount (which bolts to the trans under the CV outlet) after it was trimmed a little bit. It looks tight but you can get to all the nuts to facilitate replacement or removal.

Finally, I added a engine support strut "doggy bone" mount. You don't need to do this but because I plan to put down some serious power with this car, I felt the added regidity would pay dividends later on:



Its kinda hard to see in this pic but I used a slightly modified engine strut bracket from a 3300 V6. I modified it so it would not interfere with the 3800's alternator support bracket, in fact, it now bolts to it. The strut mount is from a 98 GTP and the big end has been totally cut off and shortened so it would fit in the space I have allowed. Basically, the part of the strut mount that bolts to the trunk wall is solid mounted via a single cross bolt which still allows it to pivot. The front of the mount still has the rubber insert so there is a slight amount of isolation present.



The end result is this is about as solid of mounting as you can get while still using rubber. I think this has the added benefit of a moderate amount of isolation while at the same time offering a high amount of strength. I purposely doubled up the mounts because they were cheap and I didn't trust just one per side espcially with the amount of torque I am producing. If you would like more pictures or info on this visit my Fiero page at: http://dtcc.cz28.com/87fiero
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1987 Pontiac Fiero 3800 Series II Turbocharged 4T60-E (98 PCM)

http://www.gmtuners.com
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DJRice
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Joined: 23 Apr 2003
Posts: 6
Location: Cocoa, FL

PostPosted: Wed Sep 03, 2003 7:33 pm    Post subject: Reply with quote
Razz

Thanks for the pics...its always good to see more innovation on these engine swaps. Maybe one of these days, I will actually throw down on a 3800IISC, but for now I will just read and look at the pretty pictures.
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--Dillon
1987 Fiero GT
1987 Fiero SE V6
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