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CBass
Joined: 03 Nov 2002 Posts: 2807 Location: Vancouver, Canada
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Posted: Tue Aug 22, 2006 4:01 pm Post subject: solid tranny mounts |
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Made up a set of these today for my car. Only thing I can say is wow... Acceleration really hits harder and the car not only feels faster, it's noticebly faster. I had to let off in some of the twisties tonight and even got a little sideways accelerating in only a slightly brisk manner around a tight corner.
Anyone interested enough to see pics? _________________ '81 931 in various states of assembly |
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morghen
Joined: 21 Jan 2005 Posts: 8884 Location: Romania
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pcarfanatic
Joined: 18 Nov 2005 Posts: 6 Location: South Africa
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Posted: Tue Aug 22, 2006 5:07 pm Post subject: |
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Cannot wait!!!! Yes please! |
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Peter_in_AU
Joined: 29 Jul 2001 Posts: 2743 Location: Sydney, Australia
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Posted: Tue Aug 22, 2006 5:13 pm Post subject: |
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and a price for a set _________________ 1979 924 (Gone to a better place)
1974 Lotus 7 S4 "Big Valve" Twin-cam (waiting)
1982 924 (As featured on Wikipedia)
Learn to love your multimeter and may the search be with you |
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Chrenan
Joined: 15 Jan 2003 Posts: 3903 Location: Canada
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Posted: Wed Aug 23, 2006 12:00 am Post subject: |
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Will they work on a 1980 5-speed? Price for a set? Any noticeable increase in harsh vibrations? Do you need to be running solid engine mounts as well? _________________ 1987 951 - M193 Version for Japan |
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Raceboy
Joined: 01 Mar 2004 Posts: 2326 Location: Estonia, Europe
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Posted: Wed Aug 23, 2006 1:00 am Post subject: |
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On a dog-leg it's shouldn't bring any noticeable increase in vibrations or noise because tranny is mounted onto the torsion bar carrier. On Audi-type noise/vibration will probably be louder. _________________ '83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold
'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche |
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Lizard
Joined: 03 Nov 2002 Posts: 9364 Location: Abbotsford BC. Canada
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Posted: Wed Aug 23, 2006 1:12 am Post subject: |
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he has a snailshell in his car right now,
I would be afraid of breaking the tranny case, _________________ 3 928s, |
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-nick
Joined: 16 Nov 2002 Posts: 2699 Location: Cambridge, MA
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Posted: Wed Aug 23, 2006 1:25 am Post subject: |
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I'm squinting my eyes at the thought too. In addition to stress on the trans case, the torsion bar carrier is mounted to the body with flexible mounts. Any twist from the engine is going to be transmitted into twisting the whole torsion carrier - which includes the attached control arms. This could do really funny things to the handling when you're on/off the throttle going around a turn.
I would think it should be more of an all or nothing deal with solid mounts - with the snailshell you also need solid engine mounts and solid torsion carrier mounts, with the Audi trans you just need the additional solid engine mounts.
I've heard of 911 folks tearing through the engine case with solid mounts. Our block is iron, which should alleviate that problem, but the gearbox is susceptible to cracking the aluminum case. |
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Min
Joined: 04 Nov 2002 Posts: 2368 Location: Vernon, British Columbia, Canada
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Posted: Wed Aug 23, 2006 1:59 am Post subject: |
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I guess we'll find out if cbass breaks something. Always good for someone to guinea pig these sorts of idea's.
Min _________________ Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting. |
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StienbargerR
Joined: 28 Oct 2005 Posts: 1362 Location: Richmond, IN
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Posted: Wed Aug 23, 2006 6:12 am Post subject: |
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I'd like to see it. If it is sucessful, I might make a pair myself, that is if it fits the 4 speed trans.
Ryan _________________ 1978 924 NA
-250lb lowering springs, Euro Pistons |
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morghen
Joined: 21 Jan 2005 Posts: 8884 Location: Romania
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Posted: Wed Aug 23, 2006 8:03 am Post subject: |
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pictures please....sounds interesting...but not realy beliveble that the car is actualy faster. _________________ https://www.the924.com |
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simsport
Joined: 06 Nov 2002 Posts: 573 Location: UK Warrington
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Posted: Wed Aug 23, 2006 9:34 am Post subject: Mounts |
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There is a cheaper way of tightening the snailshell mounts.
Take a short strip of flat steel bar, approx 1/8" thick and cut so it is a little longer than the outside metal case of the gearbox mount. Drill a hole to take the mount center bolt and run the bolt through that hole.
What it does is limit the 'inwards' movement of the rubber mount, and as you have one on both sides it keeps the box steady whilst still allowing a small amount of movement overall.
I ran my supercharged car this way for several seasons, I also had Vibratechnics engine mounts.
Cheers
Simon _________________ Blown is always best! |
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NEMESIS
Joined: 29 Jul 2006 Posts: 296 Location: BamaLamaDingGone, of course!
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Posted: Wed Aug 23, 2006 1:06 pm Post subject: Re: Mounts |
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simsport wrote: | I also had Vibratechnics engine mounts.
Cheers
Simon |
Wouldn't happen to have a part number for those mounts would you? I can't find an alternative to stock in this item anywhere. |
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Min
Joined: 04 Nov 2002 Posts: 2368 Location: Vernon, British Columbia, Canada
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Posted: Wed Aug 23, 2006 1:12 pm Post subject: Re: Mounts |
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NEMESIS wrote: | Wouldn't happen to have a part number for those mounts would you? I can't find an alternative to stock in this item anywhere. |
http://www.vibra-technics.co.uk/parts/part-details.asp?id=362
Min _________________ Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting. |
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CBass
Joined: 03 Nov 2002 Posts: 2807 Location: Vancouver, Canada
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Posted: Wed Aug 23, 2006 1:45 pm Post subject: |
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I hadn't intended on making sets for sale actually, and I can't guarantee that doing this won't horrible #### up the rear suspension or crack the tranny case... Oh well, you only live once. The vibration isn't bad at all. You can only really feel it when slipping the clutch or blipping the throttle at a stop. I do get vibrations around 2800-3200rpm, but I think that's because one of my motor mounts has gone bye bye.
Backstory is, motor mounts have gone bad, I need the car to commute and I didn't like the interesting new noises my transmission was making as a result. It's a temporary fix until I can get new motor mounts.
It's a really simple mount, just a block of 3x2" billet aluminum 2" wide. I took measurements off of a stock mount and made a solid piece that would fit in the same space.
Not having access to a decent metric stud, I tapped the bottom for 1/2"-13NC and used a bolt with loctite and a lock washer. I reused the original bolt for the transmission.
Only issues were the locating tabs for the mount. There are a couple of raised bumps that are to keep the steel bracket of the original mount from spinning and the flange face on the transmission has a lip at the very top to keep the rubber from twisting.
You'll have to forgive the poor quality of the pics, taken with a camera phone and a lamp from underneath my car.
So I guess the theory is that the tranny being rigidly located and the engine not being rigidly fixed will cause metal fatigue and break things? I might just try on some solid motor mounts and see how bad the vibration really is _________________ '81 931 in various states of assembly |
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