Urethane Do-nuts

[ardee_selby]

Does anyone know of do-nuts being made in urethane?

I believe that rubber do-nuts used on Honda drive trains have been
replicated in orange urethane with success:

"the damping and flexing characteristics of the urethane coupling are
at least as good as the original rubber with the benefit that their
life should be many times that of the OEM part. The urethane is
essentially chemically and thermally inert".

I have contacted guy in Oz, so may have some more info.

Richard

[elansprint71]

Would the orange colour clash with the orange of a Spyder chassis, one wonders

Pete
----- Original Message -----
From: ardee_selby
To: ***@***.***
Sent: Tuesday, November 12, 2002 12:21 PM
Subject: [LotusElan.net] Urethane Do-nuts


Does anyone know of do-nuts being made in urethane?

I believe that rubber do-nuts used on Honda drive trains have been
replicated in orange urethane with success:

"the damping and flexing characteristics of the urethane coupling are
at least as good as the original rubber with the benefit that their
life should be many times that of the OEM part. The urethane is
essentially chemically and thermally inert".

I have contacted guy in Oz, so may have some more info.

Richard








.

[ardee_selby]

Dunno, but might go well with a flame orange cam cover.

--- In lotuselan@y..., "Elan Sprint 71" <elansprint71@b...> wrote:

[schwartzd13]

A bit off-topic, but in my recent head rebuild/replace episode, the shop
painted my cam cover (and the thermostat housing!@?) Chevy flame orange
gloss. I was a bit flamed they didn't ask me before doing it as it
clashed miserably with my red car. They said "well it looked like it
was orange before"...not realizing that the red crinkle had discolored
from 30 years of off-and-on (over)heating!
I hate it!
-David

[simonknee]

Should get a sticker ..."Jaffa Powered", ho ho (sorry)

<snip>

Chevy flame orange gloss. I was a bit flamed they didn't ask me before
doing it as it clashed miserably with my red car. They said "well it
looked like it

[ardee_selby]

With some shops having trouble with how to jack, what to do with
spinners, finding the handbrake, opening the bonnet (hood)... and now
paint colo(u)rs - p'raps we should have "If in doubt ASK" screen
stickers when cars are booked in for work by others.

Richard

--- In lotuselan@y..., "David S. Schwartz" <d.schwartz13@v...> wrote:

[dharbeck]

--- In lotuselan@y..., "ardee_selby" <ardee_selby@y...> wrote:

these to be made at a reasonable cost?

Urethane would be a far superior material for this application, as
long as the performance was similar; could cast urethane have the
same durometer? It might be a problem if the donuts were
significantly stiffer.......

David Harbeck
'69 S4 DHC

Orange donuts would be fine

[ardee_selby]

--- In lotuselan@y..., "dharbeck" <dharbeck@e...> wrote:

I can't quote numbers but, from what I understand, the Honda S600
application has lower price than the Honda OEM part and must have a
lower demand than Elans from a) numbers still on the road and b) each
Elan having 4-off.


Again, for the Honda application it has been said
"The manufacturers have assured me that the damping and flexing
characteristics of the urethane coupling are at least as good as the
original rubber with the benefit that their life should be many times
that of the OEM part. The urethane is essentially chemically and
thermally inert"

The manufacturer in this case is someone who makes urethane
suspension bushes. The lateral load and flexing is greater on the
Elan application, however, so may be the biggest issue to consider.

Having been told that modern day rubber versions aren't as good due
to restrictions on additives used, another material might be feasible.

Richard