Limiting tourque movement with stock oil filled mounts - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 07-17-2007, 07:24 PM   #1
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Default Limiting tourque movement with stock oil filled mounts

If you dont like the solid trans mount idea when yours goes (probably will soon) and want to replace it with a oil filled mount again, I have a suggestion for limiting tourque movement of the engine/trans to help put the power down. I know a lot of old V8/RWD guys(especially bracket racers) use a limiting strap or chain. Ive seen thick woven straps, like from used 3 and 5 point harnesses, metal chains (which I wouldnt recommend due to possible snapping, then smacking into and then breaking somthing) and thick ropes (hard to attach sufficantly and a little too hillbillied). Just attach between a good,strong engine bolt(best spot onFWD probably around bellhousing) and somewhere on the frame(sub), leave room so it doesnt rub. Make sure you measure for the length of lilmiting material with the car in drive (requires 2 people; dont forget foot on brake of course). Ive seen before and after a strap was put on a '67 Fairlane with a 525ci, stroked 460.(700lb-ft torque) It knocked movement down next to nothing and shaved almost 1/2 a second off his quarter time. I Havent actually looked if there is a good spot to do it on the bonne'* yet.
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Old 07-17-2007, 11:44 PM   #2
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So what your saying is you get the limited movement of the solid mount without the vibrations around 1,200 to 1,500 RPM associated with the solid mount? That'* a pretty interesting idea.
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Old 07-17-2007, 11:59 PM   #3
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Basically, a torque strap?
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Old 07-18-2007, 04:27 AM   #4
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The only problem i have with this whole setup is that the vibration from the solid mount doesn't bother me and i think it'* alot easier to rig up the solid mount that it would be to buy a new oil filled mount and rig up this strap. But for the people who have expressed that they don't like the feel of the solid mount this does sound like a really good alternative.
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Old 07-18-2007, 09:10 AM   #5
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torque strap is another name yes. Yeah, if you dont like the vibes of the solid mounts but want a lil less drivetrain movement, this is for you. I have another material to use besides hocky pucks for a solid mount that ill post this evening after I replace mine.
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Old 07-18-2007, 09:15 AM   #6
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Has anyone tried putting a thin damping material between the hockey pucks yet? Say 1/8" or 1/4" elastomeric or rubber pad? That might dampen out that 'idle shake' a little too.
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Old 07-18-2007, 10:56 AM   #7
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Quote:
Originally Posted by willwren
Has anyone tried putting a thin damping material between the hockey pucks yet? Say 1/8" or 1/4" elastomeric or rubber pad? That might dampen out that 'idle shake' a little too.
I dont recall, but it might be something that i try when i do my front mount
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Old 07-18-2007, 10:59 AM   #8
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Elastomeric pads are great for damping out low-frequency vibration. And it won't sacrifice any movement under load, either.
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Old 07-18-2007, 12:01 PM   #9
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When I get a chance to do mine I will post up the results, but what I did was take a 1 1/2" chunk of billet aluminum and I have 2 hockey pucks on the outside (think of a sandwich with the pucks being the bun) but they aren't hard solid pucks they are pretty flexible and kinda squishy, we shall see how it works out as far as vibrations go and such but I am pretty sure that it will still have that "solid" feel to it hopefully without the vibrations.
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Old 07-18-2007, 12:38 PM   #10
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I think it will work, the vibration is probably when the motor is resting on the pucks.. and when on the throttle...who would notice it.
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