[6pack] Connecting Rods with Relief Holes

[Andrew Uprichard]

I may be talking out of turn, but my understanding is that factory rods will
not withstand significant increases in horse power in these 6-cylinder
engines.  When I rebuilt my 250, I went for upgraded rods as a hedge against
this.  I also installed cam bearings but I did stay with the original crank.


Andrew Uprichard

-----Original Message-----
From: 6pack-bounces at autox.team.net [mailto:6pack-bounces at autox.team.net] On
Behalf Of Robert M. Lang
Sent: Thursday, December 20, 2012 11:20 AM
To: Brian J. Alwin
Cc: 6pack at autox.team.net
Subject: Re: [6pack] Connecting Rods with Relief Holes

Hi,

There are two rod styles for TR6, early and late. The late rods appear with
the change to CF / CR comm. numbers.

The early rods are "better" if you're building a race engine. This is
according to a reliable source with credentials in materials science.

All TR6 cranks are forged. EN40, if I recall.

If your motor has three early rads and three late rods, there's probably a
story there unless you have an early CF / CR block in which case you have
"the luck of the draw"...

Also, if you have different rods types, I'd make sure the dynamic balance of
the motor is good - there's a difference in the weight of the early and late
rods. ;-)

regards,
rml
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Bob Lang              Triumph TR6!!            |  This space for rent
Former NER Solo Chair                          |
Voice:617-253-7438                             |  Cell: 339-927-4489
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