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solid tranny mounts
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Vince Ponz  



Joined: 02 Nov 2002
Posts: 3581
Location: Florida

PostPosted: Wed Aug 23, 2006 11:32 pm    Post subject: Reply with quote

Okay guys........be sure to check the motor mounts regularly. If a bolt breaks you may have to remove the engine to grind it out. Ask me how I know.
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Lizard  



Joined: 03 Nov 2002
Posts: 9364
Location: Abbotsford BC. Canada

PostPosted: Thu Aug 24, 2006 12:11 am    Post subject: Reply with quote

Solid motor mounts WILL rip the engine mounting points off the chassis unless you reinforce the areas
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Adie  



Joined: 11 Aug 2004
Posts: 68
Location: Toronto

PostPosted: Thu Aug 24, 2006 5:46 am    Post subject: Reply with quote

At first I thought that will rip off but lets think about this, the engine can no longer twist but should be able to move up and down slightly(the mount bolt being the axis). If you put a torque strap on hte engine like a lot of racers do you would also stop the engine from making rotational force reducing the stress on that force on the rear solid mounts, while still having the dampening ability of the original mounts, kind of like a 1/2 watts linkage on hte engine, if you were to do this I think you would have a set up that could last a LONG time.just need a couple of rose joints and mounts and your away. I thought about it for the race car once but I have a motorplate on my engine so it would have been a wasted exersize but on a stock setup it can be made to work with the existing configuration. I think the torque of the engine will be the undoing of the mounts, if it's not controlled.
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morghen  



Joined: 21 Jan 2005
Posts: 8195
Location: Romania

PostPosted: Thu Aug 24, 2006 9:30 am    Post subject: Reply with quote

the ideea to prevent the motor from rotating might save the tranny with solid mounts...but dont forget about vibration.

anyway...

the force developed by the engine when rotating or tranlsating on vertical axis WILL EXIST and WILL AFFECT whatever the engine is strapped to....the forces will still be there...only thing different is that they will affect some other part of the body and the engine might not rotate so much...
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simsport  



Joined: 06 Nov 2002
Posts: 573
Location: UK Warrington

PostPosted: Thu Aug 24, 2006 9:51 am    Post subject: Cracks Reply with quote

I did have cracks on the inside of the front bulkhead adjacent to the left engine mount bracket. We put these down to the very hard Vibratechnics mounts. However in all honesty for a comp car, so what?

For a road car they offer a softer grade with less risk of cracks.

The worst possible is having one or other end of the car (engine or gearbox) solidly mounted and the other not.

You have two heavy items at the end of a long lever, if both are fixed ok, if one is and the other not all the forces are increased on the end that is fixed and for that matter along the full length of the torque tube.

Cheers
Simon
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CBass  



Joined: 03 Nov 2002
Posts: 2807
Location: Vancouver, Canada

PostPosted: Thu Aug 24, 2006 11:02 am    Post subject: Re: Cracks Reply with quote

simsport wrote:
I did have cracks on the inside of the front bulkhead adjacent to the left engine mount bracket. We put these down to the very hard Vibratechnics mounts. However in all honesty for a comp car, so what?

For a road car they offer a softer grade with less risk of cracks.

The worst possible is having one or other end of the car (engine or gearbox) solidly mounted and the other not.

You have two heavy items at the end of a long lever, if both are fixed ok, if one is and the other not all the forces are increased on the end that is fixed and for that matter along the full length of the torque tube.

Cheers
Simon


While that sounds terrifying, I'm running a naturally aspirated engine making not all that much power and I'm quite gentle with my car. Fast, but smooth and every action is properly rev matched and my load transitions are very smooth.

The alternative is definately having a transmission failure. I'm not much for that option. Hey Vince, how's about that mount?
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CBass  



Joined: 03 Nov 2002
Posts: 2807
Location: Vancouver, Canada

PostPosted: Sat Sep 02, 2006 3:28 am    Post subject: Reply with quote

Update, mounts are holding up fine and no sign of any damage or fatigue. Not yet at least.
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flosho  



Joined: 01 Jul 2004
Posts: 3153
Location: Eau Claire, Wisconsin

PostPosted: Sat Sep 02, 2006 4:01 am    Post subject: Reply with quote

Solid motor mounts + solid tranny mount = my dream...


I figure with a flex pipe in the downpipe and wastegate, and there shouldn't be any problelm in the exhaust.


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Kenodog  



Joined: 25 Jun 2003
Posts: 2584
Location: Vancouver,B.C.

PostPosted: Sun Sep 03, 2006 8:47 am    Post subject: Reply with quote

Yeah but what no one has mentioned is the fact that once the engine and tranny have solid mounts,making them almost a single unit,there is still going to be a fair amount of torsional stress on both sets from flex in the body.This will make hard cornering almost as stressful as hard shifting,maybe worse if you really like to pull the G's.

jmho
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CBass  



Joined: 03 Nov 2002
Posts: 2807
Location: Vancouver, Canada

PostPosted: Sun Sep 03, 2006 4:29 pm    Post subject: Reply with quote

Well interesting development. I fly out for a camp job tomorrow and will be returning with enough coin to do an engine swap. Plans so far call for a 3.0 16v 968 engine and 6 speed, solid mounted to a custom aluminum front crossmember.

This is going to be nutty. So off I go to spend the next two months on a mountainside in northwestern British Columbia, drilling holes in the ground.
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morghen  



Joined: 21 Jan 2005
Posts: 8195
Location: Romania

PostPosted: Sun Sep 03, 2006 7:31 pm    Post subject: Reply with quote

hey ! this i never tought about....making a custom crossmember for the 924 to put a 944/968 engine in it....wow...nice ideea !
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JB 924  



Joined: 03 Apr 2006
Posts: 606
Location: Hessen, Germany

PostPosted: Mon Sep 04, 2006 12:02 am    Post subject: Reply with quote

Good luck with that engine swap, CBass. Hope to see some pics!
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JB 924  



Joined: 03 Apr 2006
Posts: 606
Location: Hessen, Germany

PostPosted: Mon Sep 04, 2006 12:03 am    Post subject: Reply with quote

Good luck with that engine swap, CBass. Hope to see some pics!
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