bash
Jedi Trainee
Offline
I have a Goodparts GP2 cam which I am trying to set up on my engine. I am really glad I have the engine on a stand - I would hate to try to do all this with the block in the car!
Basically, my problem is that I can't get any two of the tappet lift timings to match up. By now I am getting pretty good at adjusting the chain, thanks to the last several hours spent trying to work this out. As an example, my latest set-up gives the following (spec sheet values in brackets)
Intake valve
opening 0.010" - 29 BTDC (29 BTDC)
opening 0.050" - 2.5 BTDC (3.5 BTDC)
closing 0.050" - 47 ABDC (43.5 ABDC)
closing 0.010" - 77.5 ABDC (69 ABDC)
Duration @ 0.010" = 295.5 (278)
Duration @ 0.050" = 229.5 (227)
Exhaust valve
opening 0.010" - 66.5 BBDC (69 BBDC)
opening 0.050" - 42 BBDC (43.5 BBDC)
closing 0.050" - 7 ATDC (3.5 ATDC)
closing 0.010" - 40 ATDC (29 ATDC)
Duration @ 0.010" = 286.5 (278)
Duration @ 0.050" = 229 (227)
I am using a dial gauge mounted on top of the block (no head at the moment) to measure the movement of the push rod. I get 0.259" total lift (spec says 0.258"), so I figure I have the pushrod as close to vertical as I can get it.
I am perfectly happy to accept that I am doing it all wrong, I just can't think how at the moment. There is cam lube on the cam and the tappet, but I imagine after all the turning they have done in the last few hours there isn't a lot left. Any thoughts, advice?
Cheers
Alistair
Basically, my problem is that I can't get any two of the tappet lift timings to match up. By now I am getting pretty good at adjusting the chain, thanks to the last several hours spent trying to work this out. As an example, my latest set-up gives the following (spec sheet values in brackets)
Intake valve
opening 0.010" - 29 BTDC (29 BTDC)
opening 0.050" - 2.5 BTDC (3.5 BTDC)
closing 0.050" - 47 ABDC (43.5 ABDC)
closing 0.010" - 77.5 ABDC (69 ABDC)
Duration @ 0.010" = 295.5 (278)
Duration @ 0.050" = 229.5 (227)
Exhaust valve
opening 0.010" - 66.5 BBDC (69 BBDC)
opening 0.050" - 42 BBDC (43.5 BBDC)
closing 0.050" - 7 ATDC (3.5 ATDC)
closing 0.010" - 40 ATDC (29 ATDC)
Duration @ 0.010" = 286.5 (278)
Duration @ 0.050" = 229 (227)
I am using a dial gauge mounted on top of the block (no head at the moment) to measure the movement of the push rod. I get 0.259" total lift (spec says 0.258"), so I figure I have the pushrod as close to vertical as I can get it.
I am perfectly happy to accept that I am doing it all wrong, I just can't think how at the moment. There is cam lube on the cam and the tappet, but I imagine after all the turning they have done in the last few hours there isn't a lot left. Any thoughts, advice?
Cheers
Alistair