with the upper and lower motor mounts from rksport for instance i know it will help but
is there a significant gain in torque ??
nobody knows
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Not to hijack the thread, I was wondering if adding these harder mounts over time could damage the motor?
I know there is more vibration from the harder mounts, and was not sure that the stock softer mounts helps the motor dampen the vibrations which in turn causes less wear.
I could be completely wrong, and is why I ask.
I do know that having a lighter underdrive pulley does cause more vibration on the crank which wears it faster, so I figured the same physics might carry over.
2003 Sunfire with 2 1/4 inch turbo muffler, 2 1/4 piping, 2 1/2 inch resonator, a 2 1/4 inch catalytic converter, 2 1/4 inch down-pipe, a ported LSJ manifold, E-bay strut brace, and an AEM true cold air intake NOPI edition.
Mike85220 wrote:Not to hijack the thread, I was wondering if adding these harder mounts over time could damage the motor?
I know there is more vibration from the harder mounts, and was not sure that the stock softer mounts helps the motor dampen the vibrations which in turn causes less wear.
I could be completely wrong, and is why I ask.
I do know that having a lighter underdrive pulley does cause more vibration on the crank which wears it faster, so I figured the same physics might carry over.
ehh, not so much. sure the mounts are there to absorb vibrations and gyrations from the engine, but, since the mounts are stiffer, all it really means is that the vibrations are transmitted further, and the rest of the body is what is used as a vibration absorbent. i've never actually heard of increased wear from a lightweight pulley before, and as our engines are internally balanced (there's no harmonic dampener) there's really not going to be all that much difference there.
Edited 1 time(s). Last edited Thursday, August 07, 2008 7:15 PM
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wow... this was hard to read without gettings thoughts of depression. Motor mounts are what is used to hold motor in the car. Torque is rotational force. Soo how can motor mounts effect torque at all?, well they dont. What does happen when changing from rubber to poly motor/trans mounts is when applying power less power will be lost in rotating the position of the engine inside the engine bay. Noticable? probably only mentally. As far as i know they do not hurt the engine any seeing as that the vibrations are not increased they are just transmitted throughout the car.
Chris Blevins wrote:with the upper and lower motor mounts from rksport for instance i know it will help but
is there a significant gain in torque ??
no.
mike85220 wrote:
Not to hijack the thread, I was wondering if adding these harder mounts over time could damage the motor?
no. the engine vibrates no matter what. harder mounts just means less slop in the bushings.. this prevents the engine torquing in its mounts before moving the car. companies claim it helps responsiveness, and in a way it does, but its mostly to help deal with wheel hop. the vibs are always there, with stiffer mounts you just feel them more.
alright that's all i needed i think. thanks
another question . . . so overall motor mounts good > bad
are they worth the buck fifty price tag
If you are doing your upper and lower mounts..And your car is a 5 speed get the mounts to go in there also..They are from prothan for the tranny..
significant only if your stock ones are shot
think of it this way, its not a "gain" its a preventing of loss
1989 Turbo Trans Am #82, 2007 Cobalt SS G85
They help clean up the slop in our drivetrain quite a bit actually. And no they won't make your engine produce more torque but in a way you will produce more torque to the ground since applied torque is also a function of angle and by reducing/eliminating the deflection in your stock bushings you are correcting the torque angle slightly, resulting in slightly more power being put to the ground. They will help with responsiveness as well because they are reducing the movement of the engine. With the rubber bushings, some power is being applied in a direction to compress the rubber and the remaining power is going to the ground. As the rubber compresses it becomes stiffer and repells more of that power being wasted, which is why you feel a slight delay while your engine moves until it has reached a certain point and more of the power is going to the ground. They are worth the price, especially if you have plans for certain other parts such as a subframe brace, header, turbo kit or anything else that could significantly reduce firewall clearance. The only reason not to get them is if you don't like the increased vibrations.
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<<<<<2003 Sunfire Sedan>>>>>
Just thought i would put this in here.. if your going to put the engine mounts in i highly suggest going to transmission mounts to even it out.. I had horrible vibrations into the cab of the car with just the engine mounts and after i put the trany mounts in, i don't have any vibrations in the car at all
Turbo Tech upper mount
Turbo Tech transmission mounts
RK sport lower engine mount
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blue car (R.I.P) - 240whp @7psi..
silver car - 305whp 315lbs.tq @15psi (91 Octane) or 420whp & 425lbs.TQ @20psi (94 octane+Alcohol Injection)
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Josh F wrote:Just thought i would put this in here.. if your going to put the engine mounts in i highly suggest going to transmission mounts to even it out.. I had horrible vibrations into the cab of the car with just the engine mounts and after i put the trany mounts in, i don't have any vibrations in the car at all
Turbo Tech upper mount
Turbo Tech transmission mounts
RK sport lower engine mount
I have to recommend the same thing for different reasons. I installed an RKSport upper insert and a lower motor mount with Mark Pain's bushings to help kill parasitic loss. After 3 years, I started getting serious clunk from my tranny mount(4-speed auto). If you're going to do the motor mounts, also do the tranny mounts. The clunk was most noted when moving at low RPM's in parking lots, etc. By stiffening the engine mounts, vibration was transferred to the tranny mount, causing premature wear. Mind you, I had setup the car for low-end performance, which probably didn't help. I wrecked the car before I could install my TTR auto mount.
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"The J's weren't designed to be sports cars, the suspension sucks, the brakes are tiny, and the target market for our car doesn't need to be able to do any more than 65mph." - Shifted
A more accurate observation has never been typed. These should be the starting points before any serious performance modification. What's the point of making a serious performer if you can't control it's power?
