Chaz
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| posted on 26/4/06 at 01:59 PM |
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Professional Racing cars dont use rubber engine mounts?
I'd suppose this is to get better response and reduces power loss from the engine.
Has anyone done it???
How much does it fatigue a chassis???
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MikeRJ
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| posted on 26/4/06 at 02:05 PM |
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Not half as much as it fatigues the driver...
Many pure race cars use the engine as a stressed member of the chassis, hence it can not be rubber mounted. If you are considering using a locost on
the road then some form of isolation is essential IMO, it would not be pleasant to drive for any distance without.
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mackei23b
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| posted on 26/4/06 at 02:09 PM |
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Hi there
Agree with the first post, The main advantage of using a solid mount is that the engine becomes part of a stressed component of the chassis increasing
the rigidity of the chassis as well as potential weight savings. Just look at a single seater with a monocoque chassis, it’s the engine / gearbox that
forms the remainder of the chassis to mount the suspension
Cheers
Ian
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liam.mccaffrey
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| posted on 26/4/06 at 02:11 PM |
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lsdweb ranhis 7 on solid mounts
i think he said it wasn't as bad as expected , mind you it was a road legal hillclimber that didn't see the road much, will post more
later, at work now
Build Blog
Build Photo Album
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Liam
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| posted on 26/4/06 at 02:18 PM |
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My mates blade engined Westy was solid mounted. Could barely tell at all. But then a bike engine is a beautifully balanced and lightweight lump of
engineering loveliness with lots of mounting points. Wouldn't want to solid mount a big old pinto engine though - would probably shake the car
to bits in no time.
Liam
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MikeR
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| posted on 26/4/06 at 02:26 PM |
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bear in mind that most 4 pot car engines we're using aren't designed to be a stressed member. solid mounting them is different to using
them as a stressed member.
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greggors84
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| posted on 26/4/06 at 02:37 PM |
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You can normally buy stiffer engine mounts these still give you some vibration dampening but dont let the engine move as much.
Chris
The Magnificent 7!
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Jon Ison
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| posted on 26/4/06 at 03:09 PM |
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suspension bush's is the most I ever use, usually solid.
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MikeRJ
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| posted on 26/4/06 at 03:46 PM |
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Bike engines are a bit different, generaly much lighter internals and better balanced than e.g. a 2 litre car engine, so solid mounting would probably
be more acceptable.
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Kissy
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| posted on 26/4/06 at 04:10 PM |
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Yep, mines solid, and designed to contribute to the structure. Given I don't have seat padding, and no NVH materials (weight) it is
surprisingly smooth, it's more the frequency than the amplitude - which at certain revs makes your vision blur!
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cossey
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| posted on 26/4/06 at 04:44 PM |
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i would regularyl check the welds on your mounts though as you might have an issue with fatigue cracks on the mounting cage welds in the long run
like this
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procomp
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| posted on 27/4/06 at 07:14 AM |
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HI and also keep a large supply of altenators and starters.
matt
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NS Dev
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| posted on 27/4/06 at 09:46 AM |
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Yep, will kill alternators on car engines solid mounted unless they are extremely well balanced.
I run the engine on my grasser solid mounted (Vauxhall XE) and the vibration is severe!
It consistently cracks the welds that hold the screen weldmesh in place, and pops the heads off the pop rivets holding the panels on pretty regularly
too. Makes your eyes itch and go out of focus at certain revs too but you don't notice when racing.
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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DarrenW
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| posted on 27/4/06 at 09:46 AM |
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Ive used poly bushes on my pinto engine mounts. No problems to date.
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MikeRJ
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| posted on 27/4/06 at 11:54 AM |
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quote:
Originally posted by NS Dev
Yep, will kill alternators on car engines solid mounted unless they are extremely well balanced.
I run the engine on my grasser solid mounted (Vauxhall XE) and the vibration is severe!
It consistently cracks the welds that hold the screen weldmesh in place, and pops the heads off the pop rivets holding the panels on pretty regularly
too. Makes your eyes itch and go out of focus at certain revs too but you don't notice when racing.
Is there much advantage over using, e.g. polybushed mounts that would at least reduce some of the worst high frequency vibrations?
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Krismc
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| posted on 27/4/06 at 06:12 PM |
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marc at MNR- informed me to solid mount my 2.0 zetec in the vortx rt chassis, by the sounds of this post its a no no
what should i use pics, links please to mount my engine?
Built, Ivaed, Drove and now Sold - 2011 MNR VORTX RT+ 2000cc Zetec on R1 Throttle boddies.
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