TR6 GP2 cam TR6

[TR6oldtimer]

Richard indicates that you can advance or retard his cam a few degrees to move the curve up or down in RPMs. Have any of you with this cam done what he suggested, and how does performance differ from his standard spec?

 

[poolboy]

All this is WAY over my head, but is it any help to you ?
https://www.hottr6.com/triumph/CamBasics.html

 

[martx-5]

I'd have to guess that the TR6 cam sprocket can be adjusted in several different positions much the same as with the 4 cyl. TRactor motors. I ran into this same dilemma when I put a cam in my TR3. I couldn't get the cam timing perfect, so I had to decide whether I wanted it slightly advanced, or slightly retarted.

Advancing or retarding the camshaft moves the engine’s torque band up or down the RPM scale by moving the valve timing events further ahead or behind the movement of the piston.

<span style="font-weight: bold">In general</span>, advancing the camshafts improves low-end power and response. Likewise, retarding the camshafts generally improves top-end power and response. Of course, all engines aren't the same, so YMMV.


I opted for slightly advanced to keep the torque band lower in the rpm range.

 

[TR3driver]

I'd have to guess that the TR6 cam sprocket can be adjusted in several different positions much the same as with the 4 cyl. TRactor motors.

There are special sprockets available that allow adjusting cam timing in much smaller increments. Richard has them for the TR5-6, not sure who has them for the TR2-4.

Even if someone doesn't offer them for the TR2-4, it shouldn't be hard to bore out the holes in a standard gear, and install an offset bushing.

 

[TR6BILL]

I installed the Kent adjustable sprocket on my cam (used to have a GP2, now have an S2). We advanced it to get maximum jump.

 

[tomshobby]

I have the GP2 cam in my engine. I discussed the timing subject with my builder and he degreed it accordingly. Don't remember what we decided, was two years ago and yesterday is a challenge, but it runs very well.

 

[Brosky]

Ray,

I bought a Vernier adjustable timing gear set for mine and the machine shop set it up to a very slight advance after taking all of the other modifications into consideration. A little can be a lot here with the cam profile and everything else taken into consideration.

This is what mine looked like at the shop: