What's a good way to set TDC (compression) for each cylinder on a 2V like my M695?
I have the belt covers off, the spark plugs out and the front wheel in a baxley chock. I lift the rear wheel and rotate it in its normal direction of travel, and if I'm lucky I have a helper (wife) put a finger over the plug holes to check for the blast. Using this rotation method I can very accurately position the pulley marks as the drive pulley moves counter-clockwise.
As I understand it, with all three marks lined up on all three belt pulleys the horizontal cylinder is at TDC.
From this starting point, how many additional degrees does the drive pulley for the belts need to rotate before the vertical cylinder is at TDC (compression)?
I thought that I knew where to expect it, but my helper reports pressure build up elsewhere in the rotation, so I think I'm missing something...
BK
Quote from: BK_856er on September 17, 2008, 01:27:50 PM
-------------snip------------
As I understand it, with all three marks lined up on all three belt pulleys the horizontal cylinder is at TDC.
------------snip-------------
BK
Yes, that's correct.
An additional 135 degrees on the drive pulley will get you to vertical TDC, so the dot will be at 3 O'clock.
Quote from: Speeddog on September 17, 2008, 01:49:08 PM
Yes, that's correct.
An additional 135 degrees on the drive pulley will get you to vertical TDC, so the dot will be at 3 O'clock.
Perfect. Thanks for the confirmation. [thumbsup]
That was basically what we were seeing. The 3 O'clock will be easy to remember.
BK
Stick a screwdriver in the plug hole & feel the piston reach the top of it's stroke, it should coordinate with a dot on the flywheel window.
best to not give said helper too many variations of what she's supposed to be doing or else she'll get the shits and go back to what she wants to do.
Quote from: brad black on September 20, 2008, 09:36:02 PM
best to not give said helper too many variations of what she's supposed to be doing or else she'll get the shits and go back to what she wants to do.
Here speaks "
the voice of experience", listen well people!
;)
big