Valve lash article
- Thread starter mbaird
- Start date
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Very Interesting Indeed!
Last edited:
yellow rose
Overnight Sensation
When you can open the lash by 100% and pick up power, you need a new cam grinder. It’s unimaginable that you can miss that hard on a cam. Even if you just opened a catalog and ran your finger down the page.
Kendog 170
Let the boy go !
always adjusted my valves this way.
Quote:Here's a quick review of the EO/IC method. When the exhaust valve is starting to open (left photo), adjust the intake valve. When the intake valve is just about to close, then the exhaust lash can be set. This routine also works for setting hydraulic-lifter preload. Set one cylinder at a time, either down one cylinder bank and then down the other side. Or you can follow the engine's firing order.
I have a very noisey hydraulic cam in my 500 Stroker and have heard you can use solid lifters on a hydraulic cam. I don't know enouhgh about it to risk trying.
Quote:Here's a quick review of the EO/IC method. When the exhaust valve is starting to open (left photo), adjust the intake valve. When the intake valve is just about to close, then the exhaust lash can be set. This routine also works for setting hydraulic-lifter preload. Set one cylinder at a time, either down one cylinder bank and then down the other side. Or you can follow the engine's firing order.
I have a very noisey hydraulic cam in my 500 Stroker and have heard you can use solid lifters on a hydraulic cam. I don't know enouhgh about it to risk trying.
famous bob
mopar misfit
dog , I used to run hyd rollers in my 406 sbc engine , they made a lot of noise I couldn`t adjust out. A mech. friend told me to go to a solid roller , I did , it quited down about half the noise , why , I cant explain ! .
Kendog 170
Let the boy go !
When I first started motor I was worried breaking it in. After break in I tried adjusting to 1/2 turn then 3/4 turn. No difference so I put it back to 1/4 tiurn adjustment. I asked for a while until finnally someone had the same setup and noise. When idling sound like marbels in the motor. I'll probably put the soild cam in . At least solid cam sounds normal.
I read this.
“In many cases, it’s acceptable to use mechanical lifters on a hydraulic camshaft if relatively tight valve lash figures are used,” adds Knight. “Without clearance ramps on the hydraulic lobes, lash settings of .005-inch are usually appropriate. However, we do not advise hydraulic lifters to be used on mechanical camshafts. The lifters will react to the clearance ramps as they would to lobes with excessive base circle runout, resulting to premature lifter pump-up, valves being held open, a loss of power and an excess of pressure in the lifter that can break it. One possible exception might be a dedicated racing style lifter that’s produced for hydraulic lifter rule restrictions. This would have an extremely short plunger travel (.010- to .020-inch) and a quick leak-down rate, essentially acting as a mechanical lifter when in operation.”
I read this.
“In many cases, it’s acceptable to use mechanical lifters on a hydraulic camshaft if relatively tight valve lash figures are used,” adds Knight. “Without clearance ramps on the hydraulic lobes, lash settings of .005-inch are usually appropriate. However, we do not advise hydraulic lifters to be used on mechanical camshafts. The lifters will react to the clearance ramps as they would to lobes with excessive base circle runout, resulting to premature lifter pump-up, valves being held open, a loss of power and an excess of pressure in the lifter that can break it. One possible exception might be a dedicated racing style lifter that’s produced for hydraulic lifter rule restrictions. This would have an extremely short plunger travel (.010- to .020-inch) and a quick leak-down rate, essentially acting as a mechanical lifter when in operation.”
j par
Well-hung Member
The heavier the valve springs, the more cam deflection is present. Going to the Mopar 90 degree system helps reduce inconsistant measurements in some cases.
If i am off more than 5 to 10 degrees i see different amounts of lash.
For shitz and giggles i measured lash all the way from close to open to see how much change there was. Consistant .005 difference was observed around the base circle. 300 lb seat, 860 open
If i am off more than 5 to 10 degrees i see different amounts of lash.
For shitz and giggles i measured lash all the way from close to open to see how much change there was. Consistant .005 difference was observed around the base circle. 300 lb seat, 860 open
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