CamTiming
Thread Starter
Track Day
Joined: Oct 2004
Posts: 21
Likes: 0
CamTiming
Hello All,
I'm in the middle of a slow engine rebuild (89 S4 auto).
The problem I've encountered is: When I move the crank to the 20 degree
mark on the pulley to measure lifter movement I also get a little slack in the hydraulic tensioner between the cams. This produces a false reading at the lifter. Because the cam wheel or gear is attached to the exhaust cam, so any slack in the chain shows up as....no movement at the intake cam. This very brief but still gives an inaccurate reading.
I tried cracking a banjo fitting at the tensioner to relieve any pressure at the tensioer shoe but still get this odd movement. If I spin the crank (by hand) the tensioner shoe moves up and down creating slack between the two cams.
How do I get an acuurate reading with this condition?
Also, thanks to Dan for the cam setting page.
Got any ideas?
Thanks,
Coleman
I'm in the middle of a slow engine rebuild (89 S4 auto).
The problem I've encountered is: When I move the crank to the 20 degree
mark on the pulley to measure lifter movement I also get a little slack in the hydraulic tensioner between the cams. This produces a false reading at the lifter. Because the cam wheel or gear is attached to the exhaust cam, so any slack in the chain shows up as....no movement at the intake cam. This very brief but still gives an inaccurate reading.
I tried cracking a banjo fitting at the tensioner to relieve any pressure at the tensioer shoe but still get this odd movement. If I spin the crank (by hand) the tensioner shoe moves up and down creating slack between the two cams.
How do I get an acuurate reading with this condition?
Also, thanks to Dan for the cam setting page.
Got any ideas?
Thanks,
Coleman
Banned
Joined: May 2001
Posts: 12,264
Likes: 3
From: The Great Northwest
Fun huh? 
Louis has done this umpteen times. I forget how he keeps the chain tight. He might have it on his website or send him a pm.
http://www.performance928.com/
Louis has done this umpteen times. I forget how he keeps the chain tight. He might have it on his website or send him a pm.
http://www.performance928.com/
Originally Posted by cetrainor
Hello All,
I'm in the middle of a slow engine rebuild (89 S4 auto).
The problem I've encountered is: When I move the crank to the 20 degree
mark on the pulley to measure lifter movement I also get a little slack in the hydraulic tensioner between the cams. This produces a false reading at the lifter. Because the cam wheel or gear is attached to the exhaust cam, so any slack in the chain shows up as....no movement at the intake cam. This very brief but still gives an inaccurate reading.
I tried cracking a banjo fitting at the tensioner to relieve any pressure at the tensioer shoe but still get this odd movement. If I spin the crank (by hand) the tensioner shoe moves up and down creating slack between the two cams.
How do I get an acuurate reading with this condition?
Also, thanks to Dan for the cam setting page.
Got any ideas?
Thanks,
Coleman
I'm in the middle of a slow engine rebuild (89 S4 auto).
The problem I've encountered is: When I move the crank to the 20 degree
mark on the pulley to measure lifter movement I also get a little slack in the hydraulic tensioner between the cams. This produces a false reading at the lifter. Because the cam wheel or gear is attached to the exhaust cam, so any slack in the chain shows up as....no movement at the intake cam. This very brief but still gives an inaccurate reading.
I tried cracking a banjo fitting at the tensioner to relieve any pressure at the tensioer shoe but still get this odd movement. If I spin the crank (by hand) the tensioner shoe moves up and down creating slack between the two cams.
How do I get an acuurate reading with this condition?
Also, thanks to Dan for the cam setting page.
Got any ideas?
Thanks,
Coleman
Thread Starter
Track Day
Joined: Oct 2004
Posts: 21
Likes: 0
Dave,
This is the page I was referring to. Hope you find it useful.
http://www.kondratyev.com/porsche/te...gine/valve.htm
Coleman
This is the page I was referring to. Hope you find it useful.
http://www.kondratyev.com/porsche/te...gine/valve.htm
Coleman
