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#826659 10/15/20 10:33 am
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Jake Offline OP
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Hi,

Unsure if this is the correct forum (do let me know).

I have a modified T110 engine that's going into a Triton. I need to set the valve timings after a rebuild.

It has a T110 bottom end, T120 head, Morgo 750 barrels and presumed 3134 cams (they are unmarked but I'm told that this is the likely profile).

What valve timings would you set?

Thanks.

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If they will time to 34,55,55,34, with 0.020” setting clearance, then they are probably E3134 profile with R followers.


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Jake Offline OP
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Thanks for the info.

In addition could you suggest an appropriate running valve clearance for this motor? And am I correct in thinking that the setting is undertaken with the opposite (cylinder's) corresponding valve at full lift, (as opposed to tdc).

Thanks in advance

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Originally Posted by Jake
Hi,

Unsure if this is the correct forum (do let me know).

I have a modified T110 engine that's going into a Triton. I need to set the valve timings after a rebuild.

It has a T110 bottom end, T120 head, Morgo 750 barrels and presumed 3134 cams (they are unmarked but I'm told that this is the likely profile).

What valve timings would you set?

Thanks.
The E3134 and the E3325, (often referred to as T120 and T110 respectively) look very much the same and only measuring them will reveal which is which. The T110 cam provides slightly lower lift and less duration, but is a nice and "sporty" cam non the less. A favorite combination is an E3134 inlet with an E3325 exhaust which gives you a nice low end and a great midrange, with perhaps a couple of bhp lost over 6000 rpm. But, IMO your bike will go well with any of these cams or combinations of them. Time them at 100.5 degree lobe centers as Triumph did. The original cam markings usually comes out just fine in my experience.

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Jake Offline OP
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Lovely! Thank you for the information.

Does anyone know what valve clearances I should be setting for this engine?

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The manual says 0.002” inlet, 0.004” exhaust, for E3134 and E3225 cams.

Yes set inlet on one cylinder when inlet on other cylinder is fully open. That must be what the manual says?

0.004” is 1/8 of a turn on the adjuster. 0.002” is a clearance that you can just feel and rattle the rocker up and down a little bit. Should feel smaller than 0.004”!

Having said that, 0.004” inlet and 0.006 exhaust was recommended by American importers.

Having said that (!), my iron head T110 with E3134 cams and big valves runs much better with 0.008” clearances inlet and exhaust.


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thats interezting. megacycle specifies large clearances for their aftermarket cams, 0.007 to 0.010, generally.

one of their race camz iz lizted at 0.014/0.014.

i run 10/10 and 8/10 on the two motors i have with their cams, which iz what they recommend starting at. have had too many other things changing to experiment with that too.


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With an odd exception Triumph didn't use "quieting" ramps with their cams. Cams with quieting ramps use more clearance. This is where the cam's base circle profile is ground so the clearance is taken up slowly. With the Triumph cams in question the base circle is ground where all the clearance is taken up at the point of lift.
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DOPE
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given that, john, are stock triumph cams harder on their valve gear if the clearances are set looser?


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Originally Posted by kevin
thats interezting. megacycle specifies large clearances for their aftermarket cams, 0.007 to 0.010, generally.

one of their race camz iz lizted at 0.014/0.014.

i run 10/10 and 8/10 on the two motors i have with their cams, which iz what they recommend starting at. have had too many other things changing to experiment with that too.

I wouldn’t relate one camshaft maker’s clearance recommendation to another’s.


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DOPE
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im just interested in how they work. cam profile design is mysterious to me. id love to find a reference on camshaft design and manufacture, but its one of those secretive fields.

old racing literature descibes making your own on a lathe and then blending the cuts with a handheld oil stone. very basic.


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I have a similar engine setup in my Triton except I have a 10 stud T140 head.

I timed the E3134 (inlet and exhaust) cams to 34,55,55,34 at 0.020" and use 0.004"inlet, 0.006"exhaust running clearances (same as my 66 T120), runs great.


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Jake Offline OP
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Thank you all.


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