Another valve setting question........curious

[Mike Taylor 3601]

90 degree method does'nt work well with unsymetrical lobes or inv.radius lobes
ex opens set in/ in almost close set ex will work with anything as long as you rotate engine direction it runs.
Mike Taylor 3601

[Jim B]

Originally Posted by Mike Taylor 3601

90 degree method does'nt work well with unsymetrical lobes or inv.radius lobes
ex opens set in/ in almost close set ex will work with anything as long as you rotate engine direction it runs.
Mike Taylor 3601

Definitely x2 with some of today's race cams. You can always set one cylinder int & exh with this accurate method and check the lash the old Mopar sequence way to see if you really need to do it this way or your particular grind doesn't require it.

[1320racer]

EO/IC is the method every professional engine builder and race team uses to set/check valve lash regardless of lobe or lifter type.

Go the the Pro Stock pits immmediately after a round of qualifying, walk over to your favorite Team's trailer/pit and watch them check their valve lash, one cylinder at a time, using the EO/IC method.

[buzzinhalfdozen]

Originally Posted by 1320racer

EO/IC is the method every professional engine builder and race team uses to set/check valve lash regardless of lobe or lifter type.

Go the the Pro Stock pits immmediately after a round of qualifying, walk over to your favorite Team's trailer/pit and watch them check their valve lash, one cylinder at a time, using the EO/IC method.

How do you know this to be fact? Do you know every professional engine builder? I know several and each one seems to have their own quirk on how they lash valves. I lash my V6 stuff differently from my old V8 stuff,saying EO/IC is a very vauge explanation....how far open?....How far closed? Heck me and my brother who raced together for years, lashed valves differently. As with many things everyone seems to develope their own "style" of doing things. I believe the procedure I wrote, to be the most accurate way of setting lash...some may disagree that's OK it has worked for me thus far. Joe

[Run to Rund]

On my cam, the Mopar sequence seems to adjust a valve when the lifter is at the center of the base circle--how could that be on a ramp? Maybe my cam is too small, lol.

[Mike Pearson]

The most important thing is to make sure you are doing the exact same thing each time you check and adjust the lash. With the Jesel rockers there should not be any change in lash when you check your rockers once all of the parts have been "run in". If something is loose then you have a problem. This is for super stock style engines. I adjust mine using the degree markings on the balancer to make sure I am checking the vales at the exact same point in the engine rotation. Its not so much the process of how they are set. They need to be set consistently the same. That also goes for trying different lash settings. You just need to find a method that you are comfortable with and stick to it.

[buzzinhalfdozen]

Mike I agree 100%. What works in 1 case may not in another. It's like saying everyone runs 90 square jets and 40 degrees of timing, works on some but not all. Joe

[Bill Baer]

Originally Posted by 1320racer

EO/IC is the method every professional engine builder and race team uses to set/check valve lash regardless of lobe or lifter type.

Go the the Pro Stock pits immmediately after a round of qualifying, walk over to your favorite Team's trailer/pit and watch them check their valve lash, one cylinder at a time, using the EO/IC method.

The object is to make sure the cam lobe is on the base circle

Setting the intake valve when the exhaust is openings assures that the cylinder is at the beginning of the exhaust stroke and it's intake lobe is closed and on the base circle.
Setting the exhaust valve when the intake is closing assures that the cylinder is at the end of the intake stroke and it's exhaust valve is closed and on the base circle.
I have found this works on every four stroke engine from a Briggs &Stratton to blown hemi.regardless of the camshaft used.
I know a lot of guys use the "Mopar hood sticker method" but Keep in mind that most modern camshafts have more duration & overlap than those 70's Mopar cams.

[Adger Smith]

On a fresh setting I always set the intakes first by watching the ex. pushrod just start to lift. That way you are always assured that when you are watching the intake close (because it is already set) you are really watching it go to the correct part of the lobe to be in the right place to set the ex. I also follow the firing order. You only have to rotate the crank 1/4 of a turn to be in the correct place for the next, in the firing order, cylinder. The 1/4 turn works for both intake and ex.
As stated earlier, be very careful about setting valves with the lifter off or past the base circle. If you do you had better "Know Your Cam Lobe"
Ed you have a PM

[Ed Wright]

Thanks Adger!