Rubber donuts

[elansprint71]

I would expect that the donuts do absorb a lot of spikes from the drive
train
In changing my PRB (Aussie 7) from a sprung/damped clutch plate to a solid
centre the car became almost intolerable on the road such was the amount of
drive train noise transmitted into the chassis. This car does run rod ends
almost everywhere and very solid (eurothane) engine mounts so the rubber
cushions or springs in the clutch driven plate did absorb a lot of the
harshness from the drive. If it wasn't for the fact that we keep breaking
the clutch plates at the stress points around these dampers I would actually
go back to a softer plate. I also wonder what additional loads this is
putting on other drive train components such as the gear faces in the box
and rear axle ?

Peter
----- Original Message -----
From: Keith Franck <***@***.***>

Sent: Saturday, December 02, 2000 9:16 AM
Subject: Re: [LotusElan.net] Rubber donuts.

[type26owner]

Hi Peter,
Most engine mounts have a hardness of about 70 Shore A. Urethane is
about 95. This is a condition which is forcing more of the energy spikes
which probably should be attenuated by the mounts directly into the
driveline. You can make it slightly worse by removing all the compliant
mounts.

Have you enhanced the engine's performance by lightening the flywheel
too?
--
Keith Franck

***@***.***

Aston Martin 55' DB2/4 Mk1

Lotus Elan 66' S2

[elansprint71]

Keith
All the engine mounts are urethane including the gearbox, also to make
matters 'worse' (nosier and rougher) the main engine mounts are simple
bushes through which the main mounting bolts pass, while the hardness
remains the same I suspect that the physics of this will further firm up the
mounting (also means that they dont break)
Yes the flywheel is also lightened but the change to the clutch made most of
the difference and I'd rather keep the engine response than lose the
vibration at least while I'm racing it a lot
As I mentioned there is nothing else in the drive train allowing any
compliance either

Peter
----- Original Message -----
From: Keith Franck <***@***.***>

Sent: Tuesday, December 05, 2000 9:43 AM
Subject: Re: [LotusElan.net] Rubber donuts.

[type26owner]

Peter,
You have the classic weak link. The question is if you beef up the
clutch disc will the driveline be bullet-proof then or something else
break?

Race cars are suppose to shake and break.
--
Keith Franck

***@***.***

Aston Martin 55' DB2/4 Mk1

Lotus Elan 66' S2

[elansprint71]

It hasn't yet ............
But the life of the gearbox and diff does worry me
Peter

----- Original Message -----
From: Keith Franck <***@***.***>

Sent: Tuesday, December 05, 2000 6:44 PM
Subject: Re: [LotusElan.net] Rubber donuts.

[Arno Church]

It hasn't yet ............
But the life of the gearbox and diff does worry me
Peter

Why should this be a problem. The same gearbox and diff( the working parts and front section) were use in heavier ( Cortina , Corsair )cars with solid, live axles with no real problems.
Arno

[sprinterdave]

the donut and tighten up as much as possible, clamp the rear springs to
reduce the free spring length. Jack up the rear a frame, don't forget to
put a piece of wood under it first to spread the load you should now be
able to remove the donut bolts easily. With practice and believe me I
have had plenty you should be able to remove and replace the rear
suspension in about two- three hours.



--
David Shiers

[Doug Liedblad]

What's a jubilee clip?

Thanks

Doug

[sprinterdave]

In message <***@***.***>, Doug Liedblad <***@***.***>
writes

Dave

--
David Shiers

["Alan Andrea"]

Translation: A radiator hose clamp, spiral type. There are large ones available which will easily go all the way araound a donut.
----- Original Message -----
From: Doug Liedblad
To: ***@***.***
Sent: Saturday, December 09, 2000 9:43 AM
Subject: Re: [LotusElan.net] Re: Rubber donuts


What's a jubilee clip?

Thanks

Doug


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