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-   -   crankshaft bolt on damper turning tool (https://classracer.com/classforum/showthread.php?t=67452)

Ed Wright 09-11-2017 10:42 PM
Re: crankshaft bolt on damper turning tool
 
Randy, if your cam is ground properly, your valve lash will be the same anywhere on the base circle. If not, it has some base circle runout. It should not have that.
If it does, where in that diameter variation, do you choose to set the lash?

randy wilson 09-12-2017 01:59 PM
Re: crankshaft bolt on damper turning tool
 
Quote:
Originally Posted by Ed Wright (Post 544846)
Randy, if your cam is ground properly, your valve lash will be the same anywhere on the base circle. If not, it has some base circle runout. It should not have that.
If it does, where in that diameter variation, do you choose to set the lash?
I've just found out that on the base circle, I can be perfect in one spot, and bump it, be perfect, hit it again, and be a couple loose. I've found this on about every grind from every company to be true. I always set tight at the loosest area of the bottom. I set my valves rather tight anyway, but that's just me. Try it and see if you get the same results. Now you have me curious.

Bob Mulry 09-12-2017 02:13 PM
Re: crankshaft bolt on damper turning tool
 
Quote:
Originally Posted by randy wilson (Post 544884)
I've just found out that on the base circle, I can be perfect in one spot, and bump it, be perfect, hit it again, and be a couple loose. I've found this on about every grind from every company to be true. I always set tight at the loosest area of the bottom. I set my valves rather tight anyway, but that's just me. Try it and see if you get the same results. Now you have me curious.

I have been setting valves by bumping the engine over and setting the lash at the loosest location on the base circle on both flat and roller tappet engines.

I have been doing lash this way 50 years, I'm not saying that it's right I am saying that it has worked in past and will work in the future.

There are a lot of different ways to skin a cat, so just use what works for you.

Bob

randy wilson 09-12-2017 03:30 PM
Re: crankshaft bolt on damper turning tool
 
Quote:
Originally Posted by Bob Mulry (Post 544885)
I have been setting valves by bumping the engine over and setting the lash at the loosest location on the base circle on both flat and roller tappet engines.

I have been doing lash this way 50 years, I'm not saying that it's right I am saying that it has worked in past and will work in the future.

There are a lot of different ways to skin a cat, so just use what works for you.

Bob
There ya go. Works for me. 43 years worth.

Ed Wright 09-12-2017 06:14 PM
Re: crankshaft bolt on damper turning tool
 
Quote:
Originally Posted by randy wilson (Post 544884)
I've just found out that on the base circle, I can be perfect in one spot, and bump it, be perfect, hit it again, and be a couple loose. I've found this on about every grind from every company to be true. I always set tight at the loosest area of the bottom. I set my valves rather tight anyway, but that's just me. Try it and see if you get the same results. Now you have me curious.
If you have zero runout on your rollers, you should not see that much on lash variation at different points on the base circle. So, where do you find the loosest/most lash point?
We used to set them at TDC, compression stoke. Had the dampener marked each 90 degrees. Follow the firing order. Two revolutions got them all.
Most everybody I know bump the starter, set the intakes when the exhaust valve starts to open. No exact point. Set the exhaust when the intake is almost closed. I check my valves each day at the races. Very seldom have to adjust one.
And, stopping at the same exact point each time would very unlikely.
Lash does not vary while checking it at different points.

randy wilson 09-12-2017 07:32 PM
Re: crankshaft bolt on damper turning tool
 
Quote:
Originally Posted by Ed Wright (Post 544922)
If you have zero runout on your rollers, you should not see that much on lash variation at different points on the base circle. So, where do you find the loosest/most lash point?
We used to set them at TDC, compression stoke. Had the dampener marked each 90 degrees. Follow the firing order. Two revolutions got them all.
Most everybody I know bump the starter, set the intakes when the exhaust valve starts to open. No exact point. Set the exhaust when the intake is almost closed. I check my valves each day at the races. Very seldom have to adjust one.
And, stopping at the same exact point each time would very unlikely.
Lash does not vary while checking it at different points.
Your way sets the valves consistently the same. So does my way. To each his own.


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