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Hey guys,

I'm pulling my engine/trans this weekend, and it will be a week or two untill I go back in. I was just wondering if the factory engine mounts were rubber for the saftey of the engine/cradle, or if they were just to reduce vibration?

If they're just for vibration, what are the advantages to upgrading to either a poly mount or solid?

Just lookin for some info/opinions,

Thanks guys,

Brandon
 

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I'm not 100% but I think that the motor mounts are hydrulic. I would think that they did it for Vibration reduction. Of course what do I know!
 

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The rubber is only there for comfort. Solid mounts won't really give you any advantage in your type of racing, other than not having to keep changing them since they won't break. For you, I would reccomend you try the hockey puck trick that tbirdtess and I are both using. What you do is go buy 4 hockey pucks, 2 for each side, then drill holes through the center of them, and then you assemble the motor mounts using the top plate, 2 hockey pucks, then the bottom plate, with a bolt going through the whole thing, then install that assembly in the car. This setup has 3 advantages. First, the torque of the motor is pulling on a solid bolt, so it is as strong as solid mounts. Second, the motor is still sitting on the rubber, so it will still provide some vibration dampening. Third, it is dirt cheap. Hockey pucks are 99 cents a piece, so this is a $4 set of motor mounts, instead of $100+.
 

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thats a damn good idea. i might have to try that when my mounts break. Hockey pucks, its so obvious, lol. Theres some real thinkers around here, i love it.
 

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Ah good ole hookey pucks. I remember some people using them as body lift kits for trucks lol. Prob worked good too.
 

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will the solid hockey puck mount put more load stress on the k-member frame and cause damage or the k-member mount is strong enough?

also will the hockey puck stand the corrosion of misc. fluids and chemicals and heat in the bay?

also i think grade 10.9 bolt is definetely a must here right?
 

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The hockey puck mount won't put too much stress on the K-member. All the rubber in the mount does is isolate vibration, but when you get on the gas, the same amount of force gets transferred to the K regardless of what motor mount you have. As for it holding up, we'll see how mine do. The heat I know won't be a problem because I already had the motor running, and the mounts are fairly close to the headers, and there was no problem. I haven't spilled a bunch of crap on them yet, so I can't say for sure what fluids they will and won't hold up against. As for the bolts, I used 2 of the old head bolts from the 351 that I put in (using head studs now) and if I remember correctly, the threads were the same on that bolt as on the stock nuts that hold the upper and lower plates to the mounts.
 

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The rubber is only there for comfort. Solid mounts won't really give you any advantage in your type of racing, other than not having to keep changing them since they won't break. For you, I would reccomend you try the hockey puck trick that tbirdtess and I are both using. What you do is go buy 4 hockey pucks, 2 for each side, then drill holes through the center of them, and then you assemble the motor mounts using the top plate, 2 hockey pucks, then the bottom plate, with a bolt going through the whole thing, then install that assembly in the car. This setup has 3 advantages. First, the torque of the motor is pulling on a solid bolt, so it is as strong as solid mounts. Second, the motor is still sitting on the rubber, so it will still provide some vibration dampening. Third, it is dirt cheap. Hockey pucks are 99 cents a piece, so this is a $4 set of motor mounts, instead of $100+.
This is an interesting contraption. But really all you've done is use the hockey pucks for spacers. The bolt through the entire assembly is doing all the work and dampening (or lack of). I suppose there is a little vibration reduction.
 

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Honestly, for the sake of comfort, just go with the solid rubber mounts. There is no noticeable difference in vibration dampening between those and the factory hydraulic mounts, and they are FAR more durable. I know of several high-power cars using the rubber mounts that have not torn them or otherwise damaged them. On the other hand, both my '94 Thunderbird and '97 Mark VIII tore the factory hydraulic mounts. I used the solid rubber mounts on the Mark and it fixed a driveline vibration issue I was having. They're obviously more expensive than the hockey pucks but certainly a much more viable option.
 
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