Hi, Chris Really enjoy your videos. I have a T160 and the work shop manual (in the engine data) states that both the inlet and exhaust valve should be open 0.124- 0.135 at TDC of the exhaust stroke. You are using 0.150. Is this the preferred valve opening? Thanks Steve
Okay, so this is an anomaly that I can't explain. The optimum setting is definitely 150 thou, so why it refers to between 125-135 thou in the manual I don't know. I think that that is the standard factory setting, not the optimum one, but why not refer to the optimum 150 thou I don't know. The optimum setting is definitely 150 thou, as given by Jack Shemans (Triumph factory Mechanic) and Richard Darby (Legendary Trident mechanic and owner of 3D Motorcycles). To quote from Jack Shemans: 'For the enthusiast who wishes to check the valve timing accurately, timing on the Trident is measured by the amount one pair of valves are open with the piston of that cylinder at TDC. This is much more accurate than degrees on the crank......The figure measured by the gauge is the amount the valve was open at TDC and with standard cams the figure we are looking for is between 140 thou and 150 thou' That's all I can tell you. Why the standard measurements are in the Workshop manual I really don't know.
hi Chris.......if your starting at TDC on compression and you turn the engine backward does the intake valve not OPEN given all valves are fully closed at TDC? thanks
Absoloutely! It's not the compression stroke, it's the end of the exhaust stroke/beginning of the induction stroke. Apologies for the confusion/misinformation and thanks for the question.
Hi mate; is not clearly for me (may be I missed something that you mentioned?) why is 150 thousands the "measure". I mean why do you set up at that measurement? Thanks
I'm afraid that that's the only measurement I know. What it equates to in terms of degrees etc. I couldn't tell you, but it's the one that Jack Shemans refers to (Trident factory mechanic) and others. That's the way it's measured and that's the way it's set. No other methods (degrees BTDC or ATDC etc) are referred to. That's all I can tell you.
@@Chris.rooke150 Thanks for that. Normally when dialling in a camshaft, there is quoted a certain amount of lift at a certain degree of crankshaft rotation, for example 10 thou of lift at 10 degrees before TDC for an intake valve, without both it doesn't really mean anything.
Yes, on the Trident the measurement is taken from when the valve closes. So at TDC on the exhaust/induction stroke both valves are slightly open. By turning the engine backwards (inlet) or forwards (exhaust) and using a dial gauge you can measure when they're fully closed, and for both valves the optimum is 150 thou before (inlet) or after (exhaust) TDC.
I can't tell you, other than that is what was stated by Triumph/BSA when they built the engines. That's what they set their racing engines to. How they derived at that figure I don't know, but apparently that's the optimum position for the valve timing. More than that I can't say.
Hi, Chris Really enjoy your videos. I have a T160 and the work shop manual (in the engine data) states that both the inlet and exhaust valve should be open 0.124- 0.135 at TDC of the exhaust stroke. You are using 0.150. Is this the preferred valve opening? Thanks Steve
I'll check and get back to you. 👍
Okay, so this is an anomaly that I can't explain. The optimum setting is definitely 150 thou, so why it refers to between 125-135 thou in the manual I don't know. I think that that is the standard factory setting, not the optimum one, but why not refer to the optimum 150 thou I don't know. The optimum setting is definitely 150 thou, as given by Jack Shemans (Triumph factory Mechanic) and Richard Darby (Legendary Trident mechanic and owner of 3D Motorcycles). To quote from Jack Shemans: 'For the enthusiast who wishes to check the valve timing accurately, timing on the Trident is measured by the amount one pair of valves are open with the piston of that cylinder at TDC. This is much more accurate than degrees on the crank......The figure measured by the gauge is the amount the valve was open at TDC and with standard cams the figure we are looking for is between 140 thou and 150 thou' That's all I can tell you. Why the standard measurements are in the Workshop manual I really don't know.
hi Chris.......if your starting at TDC on compression and you turn the engine backward does the intake valve not OPEN given all valves are fully closed at TDC? thanks
Absoloutely! It's not the compression stroke, it's the end of the exhaust stroke/beginning of the induction stroke. Apologies for the confusion/misinformation and thanks for the question.
Result! 👍👏👌
Hi mate; is not clearly for me (may be I missed something that you mentioned?) why is 150 thousands the "measure". I mean why do you set up at that measurement? Thanks
Agree, the 150 thou should be at a certain degree of revolution of the crankshaft, or it's completely meaningless.
I'm afraid that that's the only measurement I know. What it equates to in terms of degrees etc. I couldn't tell you, but it's the one that Jack Shemans refers to (Trident factory mechanic) and others. That's the way it's measured and that's the way it's set. No other methods (degrees BTDC or ATDC etc) are referred to. That's all I can tell you.
@@Chris.rooke150 Thanks for that. Normally when dialling in a camshaft, there is quoted a certain amount of lift at a certain degree of crankshaft rotation, for example 10 thou of lift at 10 degrees before TDC for an intake valve, without both it doesn't really mean anything.
Yes, on the Trident the measurement is taken from when the valve closes. So at TDC on the exhaust/induction stroke both valves are slightly open. By turning the engine backwards (inlet) or forwards (exhaust) and using a dial gauge you can measure when they're fully closed, and for both valves the optimum is 150 thou before (inlet) or after (exhaust) TDC.
I can't tell you, other than that is what was stated by Triumph/BSA when they built the engines. That's what they set their racing engines to. How they derived at that figure I don't know, but apparently that's the optimum position for the valve timing. More than that I can't say.