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Author Topic:   new motor mounts, setting motor in right??
Eagle71
Dirt Full Roller

Total posts: 41
posted November 22, 2005 11:16 AM  
I'm replacing the stock style mounts in my hobby, with aftermarket ones. Do I level the motor, front to back, side to side? In the past I always used a level sitting in the intake base where the carb sits.

I had all sorts of issues with breaking tranny cases last year, I think I finally got the taken care of, but I still don't think my motor sits right with the current mounts. And they loosen up all the time, and the motor tilts, they just **** compared to stockcar mounts.

Any suggestions would be great, I'm using a rubber mount on the tranny, and solids in the front.
Ed

sc1 racing
Dirt Freak

Total posts: 428
posted November 22, 2005 12:30 PM  
bolt motor and tranny together set in car bolt trans up and bolt complete mounts on engine. make sure car is level then level the engine. and tack weld or bolt mounts to frame. that will be your easiest way..

Leaf
Dirt Full Roller

Total posts: 62
posted November 22, 2005 03:21 PM  
stock car mounts the flat ones with the bolt going straight down will not work with cast exh manifolds unless you have ram horns. I know I just cut them out of the hobby Im building after putting them in.

if its a metric, youll want your centerlink in to make sure it clears your pan, its about a inch higher than the crossmember. a claimer pan is 4.75 to bottom from bottom of block I would put it in to clear 5.25 in case you get a pan in the future.

I just did the hobby Im building with moroso mounts on the block and made the lowers, moroso sells some but they were a inch too low.

I used 1.5 square tube with a half inch id tube on top for the bolt to go thru, worked out perfect on a metric.

I built a trans mount off the x under the chassis with the intake carb base level.
The rear side mounts wont clear cast iron exh manifolds either, I cut them bacl out too.

marshalr
Dirt Maniac

Total posts: 149
posted November 23, 2005 10:15 AM  
I've always mounted mine with a 2 degree tilt to the rear. Steve Smith book on Race Car Fabrication recommends it.
It aids oil drainback and also helps keep the oil pump pickup submerged in oil.
I also theorize that it helps get air bubbles in the water jacket moved up to the radiator and out of the system when you bleed it.

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Some People Race For A Living; I Live To Race

crazybry46
Dirt Roller

Total posts: 23
posted November 23, 2005 10:27 AM  
We restored a 54 ford truck, and used solid mounts in the front and a rubber rear -
Now to the pertainant part. After breaking 2 AOD cases, someone directed us to replace the rubber trans mount with a solid one. I didn't belive this would help. Well we (my father and I )put a fabricated solid mount in the rear, and the truck is till on the road - same tranny as when we installed the mount when I was 15.
WHY?? We were told to look at it tis way. Your engine is mounted solid, right? if you let your trans hang on a rubber mount, it alows the trans to move...but it can't because of the two solid mounts up front - so somthing has to give. Now you've lifted a trans before - hard on your back (and your buddies). Now try to hold the trans with your arms perpendicular to your body. NOW add toque (twisting force) to that equastion. Arms tired yet? lol
Just my two cents.

If they give you a penny for your thoughts, but you have to put your 2 cents in, isn't sombody making a penny?

oceanridge motorsports
Dirt Full Roller

Total posts: 34
posted November 23, 2005 08:38 PM  
Solid motor mounts + solid tranny mount + plus one good wack = 1 new tranny . I have no exp. with 54 ford trucks , but if it works it works ! I do have exp. with race cars , you have to run a rubber tranny mount with solid motor mounts. We have clipped our cars , with the motor mounts TORE out of the frame , and have never had tranny problem one , with a stick or an auto . As for mounting the mounts ,if it still has the stock tranny cross member , put the motor and tranny together , with all the mounts on , set it in , make sure the tranny mount is in the cross member ,put in your drive shaft (to keep length just right)level motor side to side and tack lowers in . pull out motor and trans , finish weld , and your done . Good luck .

hoosierdaddy48
Dirt Maniac

Total posts: 112
posted November 23, 2005 10:47 PM  
see, we put a set of solid mounts on our street stock this year and left the rubber tranny mount, we have ripped the rubber mount twice in about 12 races. i have also heard that a solid tranny mount will rip the ears off the tranny. that is why we are going to a midplate now.

Spi-nex
Dirt Full Roller

Total posts: 67
posted November 23, 2005 11:10 PM  
We busted 3 trannys at the mount (which was solid mount) before we figured what was going on. We went to rubber mount, and were fine. We are also going to a mid plate for next year.

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Jonathon R. Huston
#81 Factory Stock

Leaf
Dirt Full Roller

Total posts: 62
posted November 24, 2005 11:03 AM  
marshlr,

with the intakes carb surface at exactly 0 degrees.

the block, heads etc are allready at 4.5 degrees slope towards the rear. thats over a inch in the length of the block

Adding two more degrees to all that couldnt hurt I suppose but it sure isnt necessary. The back of a decent pan is low enough as it is, ive smashed a couple lately on tracks birms.

crazybry46
Dirt Roller

Total posts: 23
posted November 24, 2005 05:52 PM  
Hey, I never thought about when you wreck a car. Good thought! Now when you guys are saying you broke trannys, was it because of wrecks, or from "normal" race usage?
I'm assuming (from what you're saying) that the way to go is solid motor mounts, mid mounts, AND a rubber trans mount, or can you go without the rubber trans mount with a mid plate?

stockcar5
Dirt Forum Champ
Total posts: 583
posted November 24, 2005 06:21 PM  
i've always run solid front and rear mounts and never broke a thing. i've even totaled a car and am still using the same tans to this day. if eveything is alighned right you wont have a problem. if alignment isnt correct you may need a rubber mount!!

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www.sathoffracing.com

J3
Dirt Maniac

Total posts: 197
posted November 24, 2005 07:00 PM  
What is a mid plate? Any one have a pic?

oceanridge motorsports
Dirt Full Roller

Total posts: 34
posted November 24, 2005 08:59 PM  
We run a rubber tranny mount out of a 76 chev c-10 "heavy half" pick -up ,it has 2 metal pieces cast inside the rubber that act as "hooks" when the rubber streches to a certain point the hooks come together to limit any further stress on the rubber , not sure if other style mounts have this in them , I just know for sure this style does , have not tore one of this style yet .and they are cheap ,less than a 20 .We also replace them at every motor rebuild ,just to be safe .I have also seen some cars with mid plates that let the tranny float on the rearend . no mount at all.

[This message has been edited by oceanridge motorsports (edited November 24, 2005).]

sc1 racing
Dirt Freak

Total posts: 428
posted November 29, 2005 08:25 AM  
ive always run solid motor and trans mounts. only way you will break is if chasis is twisting. car has rolled smacked the wall and totaled 2 cars and still hasnt broken a thing. and a frame shouldnt flex. so if your breaking tranny mounts you may want another chasis builder..

  

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