Looking for a Motor Mount DIY
Burning Brakes
Joined: Mar 2010
Posts: 1,189
Likes: 4
From: Freeport, FL
Manley, I apologues if you felt I had set you up. My reason for my response was to try and understand what you were saying.
If you take a look at molson’s post right after your response, “you can notice a difference in power delivery”. The fact of the matter, it will increase the amount of vibration into the vehicle with no benefit. If you took a ¼ mile run with stock engine mounts and then replaced them with poly mounts and ran the ¼ mile again you would see zero benefit in track times. I see a number of folks that will make statements like this about Corvettes. Unlike the “F body” mount changes on the Corvette will not gain you much if anything at all.
If you take a look at molson’s post right after your response, “you can notice a difference in power delivery”. The fact of the matter, it will increase the amount of vibration into the vehicle with no benefit. If you took a ¼ mile run with stock engine mounts and then replaced them with poly mounts and ran the ¼ mile again you would see zero benefit in track times. I see a number of folks that will make statements like this about Corvettes. Unlike the “F body” mount changes on the Corvette will not gain you much if anything at all.
And I agree with the difference being null or at the most very minimal.
I only see it as a "fun factor" for my street warrior. lol. I love the rattle feel. lol.
Resident moron
Joined: Jun 2003
Posts: 4,746
Likes: 20
From: Assachusetts
I would start with poly mounts, imo. They are a nice gain, I had them in my Camaro, and I have a poly diff mount on my C5 (which, IMO, makes the biggest difference in wheelhop). Solid mounts, IMO, are too impractical for the gain over poly mounts.
Downside is, a good set of poly mounts will cost you. I use VBP stuff, and the motor and rear diff mounts will set you back almost $500 total with shipping.
Dope
Downside is, a good set of poly mounts will cost you. I use VBP stuff, and the motor and rear diff mounts will set you back almost $500 total with shipping.
Dope
Pro
Joined: Feb 2004
Posts: 718
Likes: 1
From: barrie ontario
I used the ones found on the auction site for around $100.
They come with a lifetime warranty
With my old mounts I could shake the engine back and forth with my hand.
Perhaps I notice a bigger difference because my stock ones could have been worn out.
They come with a lifetime warranty
With my old mounts I could shake the engine back and forth with my hand.
Perhaps I notice a bigger difference because my stock ones could have been worn out.
Drifting
Joined: Mar 2010
Posts: 1,628
Likes: 15
From: Seattle WA
Well, I take it that you are new to Corvettes. Our Corvettes are different than most other cars on the road. They have a propshaft that rotates in a torque tube. These to parts allows the reacting torque a direct path back to the engine without going through the engine mounts. If you would like to learn more about this I would suggest reading this THREAD starting with post #15. 
"The "torque tube" transmits this force by directly coupling the axle differential to the transmission and therefore propels the car forward by pushing on the engine/transmission and then through the engine mounts to the car frame. In contrast, the Hotchkiss drive has the traction forces transmitted to the car frame by using other suspension components such as leaf springs or trailing arms."
All of the force of the motor that gets translated into motion goes through the motor mounts. The rotational force, on the other hand, stays the same as in a Hotchkiss drive; the motor will flex when you rev it, responding to Newton's Third Law of Motion that for every action there is an equal and opposite reaction. The motor internals are driving the drive shaft in the torque tube in one direction, so the motor's externals will end up trying to drive in the other direction. You mount the motor to the frame to counter this motion. If it wasn't for the motor mounts absorbing the rotational force of the motor and transmitting them to the frame, the first time you stepped on the go pedal the motor would just twist in place at RPM (what an interesting picture that provides).
Last edited by Trios; Oct 16, 2010 at 02:11 PM.
Tech Contributor
Joined: May 2008
Posts: 2,843
Likes: 16
From: Howell Michigan
St. Jude Donor '09-'10-'11
Uh, what? From Wikipedia, which has a pretty good article on how a torque tube setup works:
"The "torque tube" transmits this force by directly coupling the axle differential to the transmission and therefore propels the car forward by pushing on the engine/transmission and then through the engine mounts to the car frame. In contrast, the Hotchkiss drive has the traction forces transmitted to the car frame by using other suspension components such as leaf springs or trailing arms."
All of the force of the motor that gets translated into motion goes through the motor mounts. The rotational force, on the other hand, stays the same as in a Hotchkiss drive; the motor will flex when you rev it, responding to Newton's Third Law of Motion that for every action there is an equal and opposite reaction. The motor internals are driving the drive shaft in the torque tube in one direction, so the motor's externals will end up trying to drive in the other direction. You mount the motor to the frame to counter this motion. If it wasn't for the motor mounts absorbing the rotational force of the motor and transmitting them to the frame, the first time you stepped on the go pedal the motor would just twist in place at RPM (what an interesting picture that provides).
"The "torque tube" transmits this force by directly coupling the axle differential to the transmission and therefore propels the car forward by pushing on the engine/transmission and then through the engine mounts to the car frame. In contrast, the Hotchkiss drive has the traction forces transmitted to the car frame by using other suspension components such as leaf springs or trailing arms."
All of the force of the motor that gets translated into motion goes through the motor mounts. The rotational force, on the other hand, stays the same as in a Hotchkiss drive; the motor will flex when you rev it, responding to Newton's Third Law of Motion that for every action there is an equal and opposite reaction. The motor internals are driving the drive shaft in the torque tube in one direction, so the motor's externals will end up trying to drive in the other direction. You mount the motor to the frame to counter this motion. If it wasn't for the motor mounts absorbing the rotational force of the motor and transmitting them to the frame, the first time you stepped on the go pedal the motor would just twist in place at RPM (what an interesting picture that provides).
Pro
Joined: Feb 2004
Posts: 718
Likes: 1
From: barrie ontario
This explains the benefit much better than I can...
http://www.pfadtracing.com/catalog/p...products_id/99
http://www.pfadtracing.com/catalog/p...products_id/99
