[Fot] TR3 vs TR4 crank, differences?

[John Hasty]

Dream on.....

Sent from my iPhone

> On Jul 30, 2014, at 11:34 PM, "Tim Murphy" <timmurph at fastbytes.com> wrote:
>
> I'm thinking of prepping a crankshaft for our TR4 vintage racer.  I have at
> least one TR3 crankshaft, a TR4 crankshaft and one or two other unknown
> spares.  Are there any differences or are they the  same and can be used in
> a TR4?
>
>
>
> I first plan to have it crack checked and checked for straightness and
size.
> The next step would be balancing and lightening possibly?  Is there any
> significant advantage to polishing the crank, other than that it looks real
> pretty?  Then I was going to have it bead blasted and nitrided and finally
> ground  with the proper radiuses and fillets.  I have to review Kas's books
> to check for other tips.  I've got CRS disease (Can't Remember Stuff) and
> it's been awhile since I read some of those books!
>
>
>
> Thanks for the info and any other tips on crank prep.  Once I've got the
> "new" crank I'll install it on the following rebuild with the thought that
> with the forged pistons, Carrillo rods and the "new" crank, we should be
> able to use 6500 RPM reliably.
>
>
>
> Tim & Ryan 1961 BRG TR4 #317
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