I have most of my bearings done by Polymer Dynamics in Texas, mains & rods.
The thickness is usually a couple tenths (I think they call out .0002-.0004),
per shell, and it absolutely must be accounted for when calling out the crank
regrind spec, if you are building to a reasonable degree of accuracy.
HTH
Glen
-----Original Message-----
From: toodamnfunky@comcast.net
To: Tim Murphy <timmurph@fastbytes.com>
Cc: Randall <TR3driver@ca.rr.com>; fot@autox.team.net
Sent: Wed, Sep 15, 2010 1:18 pm
Subject: Re: [Fot] Accusump & bearing coatings
I read on Tony's site that he uses Calico for bearing coatings applied at .25
- .30 mil.
( per Calico )
In my upcoming build I plan to cryo treat and nitride the crank and coat the
bearings.
Does anyone know if an allowance needs to be made for the bearing coating
when
cutting a crank? and should the rod bearings be coated as well and again with
the
allowance for the coating on the rod bearings.
Jim G
----- Original Message -----
From: "Tim Murphy" <timmurph@fastbytes.com>
To: "Bill Babcock" <billb@bnj.com>
Cc: "Randall" <TR3driver@ca.rr.com>, fot@autox.team.net
Sent: Wednesday, September 15, 2010 10:53:23 AM
Subject: Re: [Fot] Accusump
One other thing, we're using the coated bearings which I know some other
folks are using on the TRactor motors. B I would think that would also help
prolong the life with a "cold" start. B I don't know which coating the
machine shop sent them out for. B I think it was to the guy here in Wisconsin
who I had heard more or less invented the bearing coating when he was
working at Mirro Aluminum and doing work on coated pots and pans.
Tim
-----Original Message-----
From: Bill Babcock [mailto:billb@bnj.com]
Sent: Wednesday, September 15, 2010 10:54 AM
To: Tim Murphy
Cc: 'Randall'; fot@autox.team.net
Subject: Re: [Fot] Accusump
Probably only worthwhile if you pull the plugs first, otherwise you're
probably shortening the life of an already overworked starter. Of course if
you do that make sure you disconnect the power lead to the coil, or you're
sending sparks everywhere and shortening the life of an overworked coil,
distributor, and plug wires. Then reconnect everything quickly and fire it
up. Or flip on the ignition switch with an accusump connected and wait for
your oil pressure to peak at 20 pounds and start it while the system is
fully pressurized.
Hmm, I wonder which is better.
On Sep 15, 2010, at 8:17 AM, Tim Murphy wrote:
> Is there any advantage to cranking the engine without ignition until the
oil
> pressure comes up and then flipping the ignition on to fire it? B If would
> seem the loads on the bearings with just cranking it over would be quite a
> bit less, and less damaging, than actually firing the engine immediately.
>
> Tim
_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Donate: http://www.team.net/donate.html
Archive: http://www.team.net/archive
Forums: http://www.team.net/forums
Unsubscribe:
http://autox.team.net/mailman/options/fot/toodamnfunky@comcast.net
_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Donate: http://www.team.net/donate.html
Archive: http://www.team.net/archive
Forums: http://www.team.net/forums
Unsubscribe: http://autox.team.net/mailman/options/fot/fubog1@aol.com
_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Donate: http://www.team.net/donate.html
Archive: http://www.team.net/archive
Forums: http://www.team.net/forums
|