[Fot] TR6 camshaft "CB"

[Bob Kramer]

Agreed. I based the cam timing being off by the position of the camshaft
gear. I assume that this is a stock grind and the slot in the front boss of
the new cam, the one that leaves a discoloration on the back of the gear
was off from the marks on the reused timing gear. And the distributor drive
was off position.

Bob Kramer


On Mon, May 8, 2023 at 6:10 AM Chip Collingwood <chip at theukmotorsports.com>
wrote:

> Not certain about the cam "CB" designation. And the distributor drive
> being off a tooth has nothing to do with cam timing. That is a relationship
> between the cam and the crank set by how you install the cam sprocket. The
> distributor drive only orients the proper position of the distributor so
> that its body doesnt contact the block and prevent the "ignition timing"
> from being set properly.
> I believe there are 2 big issues with the cams/blanks. Most important is
> always installing cam bearings as it will prevent any oil pressure loss due
> to poor tolerance of original castings. And second is the oil pump for the
> valve train is affected by rear cam bearing surface/cut. Evidently some
> blanks are inadequate in comparison to the originals. I would source a good
> original blank and have it cut to your specs.
>
>
> On Mon, May 8, 2023, 1:50 AM Bob Kramer via Fot <fot at autox.team.net>
> wrote:
>
>> I am rebuilding an engine for a local club member and I just tore down
>> the engine. It looks like someone rebuilt it but it did not run very long
>> until it coked up the new pistons and valves. The camshaft installed looks
>> to be from an unmarked new core and the only stamping on it is a capital CB
>> on the back boss.  Has anyone seen this camshaft designation before? It was
>> not timed correctly and the distributor drive was off by a tooth so I want
>> to make sure I set him up with a car that will run correctly this time.
>> I've heard that some of the blanks were not of a good quality so this is
>> another worry.
>>
>> Bob Kramer
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