Solid or Poly motor mounts with a 9 second car?
Solid or Poly motor mounts with a 9 second car? I am posting this here because this is the only section that has gon fast and would know!! 
I am wondering what the limits of the Poly motor mounts have been for you guys with a 9 second car with a trans brake???
The ONLY reason I am asking is because I have heard of breaking aluminum blocks with the solid mounts. Does any one know under what curcumstance this happened? I will not run a motor plate with my new setup. Let me know what you guys have done with both solid mounts and poly mounts. Thanks.
I am wondering what the limits of the Poly motor mounts have been for you guys with a 9 second car with a trans brake???
The ONLY reason I am asking is because I have heard of breaking aluminum blocks with the solid mounts. Does any one know under what curcumstance this happened? I will not run a motor plate with my new setup. Let me know what you guys have done with both solid mounts and poly mounts. Thanks.
On The Tree
Joined: Feb 2005
Posts: 137
Likes: 0
From: DFW, Texas
Can't say for sure, but you might try the Drag Racing section on this site.
If it were my ride, I would go with poly, becasue I would be more scared about breaking a motormount, then an aluminum block.
If it were my ride, I would go with poly, becasue I would be more scared about breaking a motormount, then an aluminum block.
John, What trans do you have. I was thinking the poly mounts might be the best bet for my hard transbrake launches. I am just afraid solid mounts will be to hard on the aluminum block. Do you have any idea how much your motor moves with the poly mounts. I have a Twin turbo with alot of plumbing and do not want to worry to much about crap moving around to much.
Originally Posted by 1997 vet
He was asking about 9sec cars John.J/K 
ROFL
only 5 posts and one of em is a zinger haha i love it!
i suggest motor plates. however it depends on how much you love your aluminum block. theres a reason why every old drag car has them. and they dont even have aluminum blocks!
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I have T400 and a transbrake. On the 'brake the motor moves up about two inches, as opposed to the 4-5 inches it would do with stock mounts just revving it (three years ago).
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I just sold my 18 degree 427. I ran a motor plate with that. With my new LS1 motor, I did'nt want to run a motor plate so that I would have room for my turbo setup. I am running ALL accessories. I have never run poly mounts before. I have always had a motor plate.
All I am really wanting to know is if anyone gas run poly mounts with a 1.5ish 60' and 9 second times.
John. Your motor still moves 2"?? That sure seems like alot! Is that twisting 2" or lifting or what.
All I am really wanting to know is if anyone gas run poly mounts with a 1.5ish 60' and 9 second times.
John. Your motor still moves 2"?? That sure seems like alot! Is that twisting 2" or lifting or what.
It's a given that our engines will torque up (lift up) on the driver's side. I only dicovered how much it torques up because the oil feed line to my blower hit the body on my setup. We had not done any clearancing for it. This was discovered when we used the 'brake. Maybe it's 1.5" inches, or 2.0, but there is some movement. I won't run steel mounts or a motor plate so I'm fine where I am at.
I run 1.45 60's with the stockers on a heavy 3900+ race weight. No problems. The poly mounts should work the best if you don't want to use a motor plate. The people I talked to said that on a hard launch the solid mounts distort the block and some of the cylinders were not sealing properly.
Strokedls1- You run the factory rubber mounts!
With 1.5" of movement sounds like I might have trouble with my cold side plumbing and my down pipes taking alot of abuse.
With 1.5" of movement sounds like I might have trouble with my cold side plumbing and my down pipes taking alot of abuse.
dont have a trans brake but i do have a 9 second slip and a 2 step.
all my passes have been with stock motor mounts and stock tranny mount.
I'm happy that my mounts give instead of my block
the only reason i have a poly trans mount now is because my girlfriends mount broke in her t/a and i didnt want to give her the mod!
all my passes have been with stock motor mounts and stock tranny mount.
I'm happy that my mounts give instead of my block
the only reason i have a poly trans mount now is because my girlfriends mount broke in her t/a and i didnt want to give her the mod!
I had a 650 hp 427 sbc with a motor plate I just sold. The car did not "vibrate". You could just "feel" the motor. Like if you were at a light, The car would rock with the cam lump. The cam was a .680 lift with almost 260 duration at .050! So the vibration carp is not really even an issue. For me a motor plate will be more trouble then it is worth.
Right now I think I am going to pick up the poly mounts and do some other tricks.
Right now I think I am going to pick up the poly mounts and do some other tricks.
i dont know how this is an issue honestly. you choose to run an aluminum block and make huge hp, you better back it up. john, count your blocks days. not being a dick when i say this john, but you dont race the car often enough to say your car is a proven solid setup. 2 inches is a **** load of engine movement off a brake makin 800+ rwhp. do we not remember harlan breaking blocks until he went to the motor plate setup and hasnt broken a block since?
i see 500+ rwhp cars at the track with motor plates. any car you race the **** out of, you will break an aluminum block with a t-brake, 2 step, anything, if you race the **** out of the car. give it time. just like cars making 800 rwhp on 93 octane with boost and 9:1 comp. yeah it will do that on the dyno, go drive the car like you stole it for a week, see if it lives for long.
i see 500+ rwhp cars at the track with motor plates. any car you race the **** out of, you will break an aluminum block with a t-brake, 2 step, anything, if you race the **** out of the car. give it time. just like cars making 800 rwhp on 93 octane with boost and 9:1 comp. yeah it will do that on the dyno, go drive the car like you stole it for a week, see if it lives for long.