Solid Motor Mounts anyone?
12-30-2007, 03:28 PM
#16
Three Wheelin'
Thread Starter
Ken, I also had a Celica with solid mounts! A '75, it was a great autoX car and I have fond memories of it.
I've never understood why everyone one thinks that a car is going to be subject to intense vibration with solid motor mounts or suspension points. None of those are as signifigant as a low profile tire. The '75 Celica should have been brutal with it's inline 4 but it had nothing more than a sense of buzz like vibration at idle, certainly not uncomfortable.
Perry, none of this kind of stuff like solid mounts should apply to a normal street driven car and I have an 87 928 that is just fine and a wonderful car just as it came from Porsche, this is more for track junkies, racer builders and gearheads.
In a nutshell solid mounting helps the tortional rigidity of the chassis, IMO the torque tube design lends itself to worthwhile gains when used with solid mounting, even more gains than a conventional drivetrain IMO. Torsional rigidity is what seperates a tube frame racer from a street car.
I've never understood why everyone one thinks that a car is going to be subject to intense vibration with solid motor mounts or suspension points. None of those are as signifigant as a low profile tire. The '75 Celica should have been brutal with it's inline 4 but it had nothing more than a sense of buzz like vibration at idle, certainly not uncomfortable.
Perry, none of this kind of stuff like solid mounts should apply to a normal street driven car and I have an 87 928 that is just fine and a wonderful car just as it came from Porsche, this is more for track junkies, racer builders and gearheads.
In a nutshell solid mounting helps the tortional rigidity of the chassis, IMO the torque tube design lends itself to worthwhile gains when used with solid mounting, even more gains than a conventional drivetrain IMO. Torsional rigidity is what seperates a tube frame racer from a street car.
12-30-2007, 04:41 PM
#17
I didn't mean to imply that the solids you have made would make the 928 unbearable Mike. But since I have been on track about three times all together, the differences would be useless for my experience level.
12-30-2007, 05:08 PM
#18
Three Wheelin'
Thread Starter
Brendan, I wasn't replying to anything you said, it's an ages old topic.
Whenever the topic of solid suspension or motor mounts come up the initial feeling even among wise gearheads is to worry about driveabilty and vibration. It's universal across different car communities. IMHO it's an urban legend. I've driven different cars before and after making changes and it's never been anything but an improvement. Maybe it's subjective, beats me.
Whenever the topic of solid suspension or motor mounts come up the initial feeling even among wise gearheads is to worry about driveabilty and vibration. It's universal across different car communities. IMHO it's an urban legend. I've driven different cars before and after making changes and it's never been anything but an improvement. Maybe it's subjective, beats me.
12-31-2007, 12:15 AM
#19
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The more I think about these, the more I wish I had the spare cash. I even have to pull the TT/tranny sometime soon which would be the perfect time to install a solid tranny mount.
12-31-2007, 04:42 PM
#21
Hi Mike,
Those mount's would be perfect for my project too. But since I'll be using an auto trans I'd need
one's to fit an auto box, I have not checked to see the differences between a 5spd & a/t if any ?
I'm not ready to place an order now but definitely will later, save a front & rear set for me please !
Thanks
Those mount's would be perfect for my project too. But since I'll be using an auto trans I'd need
one's to fit an auto box, I have not checked to see the differences between a 5spd & a/t if any ?
I'm not ready to place an order now but definitely will later, save a front & rear set for me please !
Thanks
12-31-2007, 05:08 PM
#22
Three Wheelin'
Thread Starter
Hi Joe! I'll make a couple of sets sometime soon and they'll be lying around if you ever need them.
For the transaxle I've been considering a different design and may be able to taylor something for an auto if there are any differences.
The current design is intended to allow for-aft flexing and I want to make something in steel with a different geometry to better accomodate that flexing.
For the transaxle I've been considering a different design and may be able to taylor something for an auto if there are any differences.
The current design is intended to allow for-aft flexing and I want to make something in steel with a different geometry to better accomodate that flexing.
12-31-2007, 11:18 PM
#24
Rennlist Member
might this provide additional stress on that aluminum mount on the block itself?
this would worry me in a race kind of condition. the motormounts are pretty stiff when new and on the s4 they are stiff compared to the early cars too.
very nice looking though, and it would enhance the engine vibration, which in my book, is a good thing!
MK
this would worry me in a race kind of condition. the motormounts are pretty stiff when new and on the s4 they are stiff compared to the early cars too.
very nice looking though, and it would enhance the engine vibration, which in my book, is a good thing!
MK
01-01-2008, 09:21 AM
#25
Three Wheelin'
Thread Starter
That's probably the conventional wisdom but I disagree and believe that solid mounting improves block strength. I know that may sound counterintuative but I do believe it. Sorry I can't explain why well but if I were to try it would be something about greater mass to resist movements blah blah. I would be sure to toss in some buzz words and lots of hand gestures.
