All solid mounts but engine = shake at RPM?
#1
All solid mounts but engine = shake at RPM?
I have solid (delrin) bushings everywhere except the motor mounts. (I have them, but un-installed)
The car had no shakes and drove fine, then I did a turbo drive train swap with a ACT lightweight flywheel. I purchased a s4 counterweight from my friend as my car is a s4 motor.
I realize the counterweight may be wrong, but I have also heard that having solid mounts everywhere but the engine mounting bolts can also lead to vibration. The vibration can be felt everywhere: shifter, seats, dash, radio area, the works.
My question, specifically, could my car be shaking due to solid mounts everywhere but the motor?
Other notables: Driveshaft felt fine, Counterweight was locktite'd and tourqued to ACT specs, Flywheel was impacted on. Delrin EVERYWHERE except mazda comp frond diff mount and oem motor mounts.
Thanks.
And yes I searched.
The car had no shakes and drove fine, then I did a turbo drive train swap with a ACT lightweight flywheel. I purchased a s4 counterweight from my friend as my car is a s4 motor.
I realize the counterweight may be wrong, but I have also heard that having solid mounts everywhere but the engine mounting bolts can also lead to vibration. The vibration can be felt everywhere: shifter, seats, dash, radio area, the works.
My question, specifically, could my car be shaking due to solid mounts everywhere but the motor?
Other notables: Driveshaft felt fine, Counterweight was locktite'd and tourqued to ACT specs, Flywheel was impacted on. Delrin EVERYWHERE except mazda comp frond diff mount and oem motor mounts.
Thanks.
And yes I searched.
#2
I forgot to add, my shaking characteristics are:
Normally Smooth from 0-3500 RPM, then raising shake with RPM.
Under WOT I did notice one time where it smoothed out at high RPM, maybe 6500-7000. I do not know if its every time as I don't want to damage the engine in any way so I only WOT'd to redline when we first noticed it.
Normally Smooth from 0-3500 RPM, then raising shake with RPM.
Under WOT I did notice one time where it smoothed out at high RPM, maybe 6500-7000. I do not know if its every time as I don't want to damage the engine in any way so I only WOT'd to redline when we first noticed it.
#3
sounds like that used counter weight is biting you in the ars....
If you had the vibration all over the RPM range I would say it was the mounts... I have a 240 with soild everything and it shakes like hell.... howeverthe fact that your seeing it at 65-7 ... Thats no good...
If you had the vibration all over the RPM range I would say it was the mounts... I have a 240 with soild everything and it shakes like hell.... howeverthe fact that your seeing it at 65-7 ... Thats no good...
#4
Yeah, I am afraid that if I put in my solid mounts it will get worse if it is a wrong counterweight. Right now it is drive-able and I am going to replace the engine/weights with a balanced unit in 3 months so it doesn't bother me to keep it low RPM for now.
#7
sounds like that used counter weight is biting you in the ars....
If you had the vibration all over the RPM range I would say it was the mounts... I have a 240 with soild everything and it shakes like hell.... howeverthe fact that your seeing it at 65-7 ... Thats no good...
If you had the vibration all over the RPM range I would say it was the mounts... I have a 240 with soild everything and it shakes like hell.... howeverthe fact that your seeing it at 65-7 ... Thats no good...
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#13
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Other then the fact that the counter weight is used I don't see that being a problem since you are still in the correct series. Even so I dont see how a used conterweight could cause this w/o obvious visual signs.
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OK..let's get real here.Question answer: Your car wouldn't be Shaking because you replaced the Mounts..I Replaced the Tranny Mounts With Solid,and didn't bother to do the Engine mounts..It just Made the car more Vibrating through the chassis,as you would expect when the Transmission is SOLID to the Chassis.You feel alot of Gear Rumble,etc..But not SHAKING..the Shaking Could be the Driveshaft.YES the driveshaft!..IF the driveshaft wasn't replaced as it Was before.MY Suggestion would be to Jack the car up and Turn it 90 Degrees at the differential and See if the Vibration goes away...then try Another 90..then another 90..That would RULE out Driveshaft after this was done.
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If the car is vibrating only when driving and not at idle, then its probably a driveshaft issue.
Also check to make sure that no part of your exhaust system is touching the underbody.
Also check to make sure that no part of your exhaust system is touching the underbody.
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