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Old 11-22-2012, 11:59 AM
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valve adj

if hydraulic lifters are adj to tight [1 full turn after zero lash] what effects would this have, if any on total timing? thank you skipp 468 bb mild cam

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Old 11-22-2012, 01:08 PM
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Originally Posted by skipp View Post
if hydraulic lifters are adj to tight [1 full turn after zero lash] what effects would this have, if any on total timing? thank you skipp 468 bb mild cam
If they are to tight, they will eat a lobe..I go a 1/4 to half of a turn on mine..
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Old 11-22-2012, 02:09 PM
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Adjustment that is still in the range offered by the hydraulic portion of the lifter will have absolutely NO affect on cam timing (I think you are wondering about duration and lift amounts?). Loose...tight... it makes no difference to cam timimg as long as you are still in the hydraulic range of the lifter. You can't change cam duration or lift by changing the adjustment on a hydraulic cam - that is only possible with a solid lifter design.

If the adjustment is too tight and bottoms out the hydraulic piston in the lifter,... then you will have a distinct miss due to valves being held off their seats when they should be closed.
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Old 11-22-2012, 04:37 PM
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adj lifters

thanks for the help, the reason i was asking was a timing of 50+ degrees is were the car runs right i built the motor the timing marks are on 6+12 o'clock positions , does not start hard,no pinging etc.has me stumped thanks again Skip
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Old 11-23-2012, 04:57 AM
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Quote:
Originally Posted by skipp View Post
thanks for the help, the reason i was asking was a timing of 50+ degrees is were the car runs right i built the motor the timing marks are on 6+12 o'clock positions , does not start hard,no pinging etc.has me stumped thanks again Skip
Ayuh,.... It sounds like yer confusin' Cam timing with Ignition timin'...

While vaguely related, they're not really dependent on each other...
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Old 11-23-2012, 08:07 AM
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I appears that you may have the engine 180 degrees out of timing if you are adjusting the valves with #1 at TDC on the compression stroke.

Many shop manuals show to install the timing sprocket marks at 6 o'clock and 12 o'clock on the cam sprocket and crank sprocket but the shop manual neglects to tell you that is #6 cylinder at TDC on the compression stroke. It is easier to align the timing marks in that position but after the timing marks are aligned at 6 o'clock and 12 o'clock, the crank needs to be turned by hand one revolution CW to bring the cam sprocket timing mark from 6 o'clock to 12 o'clock and the crank sprocket timing mark once again to 12 o'clock, if you intend to adjust the valve with #1 cylinder at TDC on the compression stroke.

Last edited by MouseFink; 11-23-2012 at 08:28 AM.
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