I run also Scat rods (2-54L-6657) from a Ford which has the same diameter
than Triumph.
The rods length is 6.65".
I center the rod with the piston which are narrow made to the rods specific.
I run this config since 2008 and I does last.
This year I test a very tight rod bearing clearance - 0.00157" to see if the
bearing wear is decreased as the bearings tend to run on their edge with
much clearance.
Over the next weeks I open the motor to have a look and can tell you.
This year the engine has run 625 race mls and 400 street mls this year.
Cheers
Chris
-----Urspr|ngliche Nachricht-----
Von: fot-bounces@autox.team.net [mailto:fot-bounces@autox.team.net] Im
Auftrag von Larry Young
Gesendet: Freitag, 9. Juli 2010 17:56
An: Mark Pendergrass
Cc: friends of triumph
Betreff: Re: [Fot] chevy con-rods
The rods I used are made by Skat for 2.10 inch crank pins and 6.25
length. You can find bearings for as small as 2.00. I modified
(welded) the crankshaft by making the bearing journal narrower. An old
post by Greg Solow indicated modifying the crank to increase the radius
where they always crack is a good idea, so I did that at the same time.
The only problem with this was that welding on the crank made it
difficult to straighten for grinding and nitriding. You could also have
a Moldex made for Chevy rods. I was having custom pistons made by
Wiseco and had them made for the chevy wrist pin (no extra cost).
I don't like the way that chevy rod bearings are not symmetric
(side-to-side) because they are designed for one side to be against the
neighboring rod (no radius). I think a better bet are the Skat rods for
a VW Jetta. They are a bit longer than stock TR4, but that is not a
problem if you are having customs pistons made.
Other possibilities for rods are the Ford Triton V8 and (believe it are
not) 7 inch rods for the Ford Flathead V8 (very light).
Larry Young
Mark Pendergrass wrote:
> Good Morng Family, could i get a little input on what type or application
of
> the chevrolet connecting rods some of you folks are useing in the tractor
> engines as i have seen mentioned, starting on a spare engine and they
sounded
> like a possable alternative to what i have been using, any input
> ??.....Thanks..........Mark Pendy........#65TR4
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