dual pattern cams

woodsnake · 05-18-2006, 08:10 PM

Yes, it's a hyd cam. I built the whole engine while attending the auto tech program at BSU.
Initially, (The first time I did it) I started on hte number one cylinder, set 'zero lash' I.E. barely any drag on hte pushrods, adn then rotated the crankshaft 90 deg, and did the next cyl in the firing order.
At that time the engine had not fired, and I think the lifters had not pumped up enough upon fireing, and that is why ( I thought) the first set got bent.
We check for spring binding, no problem. Installed second set, adjusted 'loosely'(only taking slack off of rocker, not p/r) and all seemend well. Until I heard the noise, etc...
Now I am waiting for the replacement roller from summit, so I can try it again. My thinking was that also since I had comp cams "289/302" pushrods, that difference in length 6.876 (comp) VS 6.805 (edel 289)
may have been the problem. If the difference in pushrod length could have been that big a problem, then perhaps the difference in lobe height .520-.496 = .024 might require a 'hot' adjustment, I. E. motor running.
I am at a complete loss here. None of this should have happened 'by the numbers'.

05-18-2006, 08:10 PM	#3
woodsnake woodsnake Join Date: May 2006 Location: Nampa, Id Posts: 17	Re: dual pattern cams Yes, it's a hyd cam. I built the whole engine while attending the auto tech program at BSU. Initially, (The first time I did it) I started on hte number one cylinder, set 'zero lash' I.E. barely any drag on hte pushrods, adn then rotated the crankshaft 90 deg, and did the next cyl in the firing order. At that time the engine had not fired, and I think the lifters had not pumped up enough upon fireing, and that is why ( I thought) the first set got bent. We check for spring binding, no problem. Installed second set, adjusted 'loosely'(only taking slack off of rocker, not p/r) and all seemend well. Until I heard the noise, etc... Now I am waiting for the replacement roller from summit, so I can try it again. My thinking was that also since I had comp cams "289/302" pushrods, that difference in length 6.876 (comp) VS 6.805 (edel 289) may have been the problem. If the difference in pushrod length could have been that big a problem, then perhaps the difference in lobe height .520-.496 = .024 might require a 'hot' adjustment, I. E. motor running. I am at a complete loss here. None of this should have happened 'by the numbers'. __________________ Disclaimer!! All info provided by the woodsnake is free, and worth what it costs!! Use with caution What can I say, I like Cougars... " yer darn right wow " http://woodsnake4462838.tripod.com/68_part_2 http://woodsnake4462838.tripod.com/cougars_at_rest/

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