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Jeep Engine Guidance |
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Kreep
AMC Apprentice Joined: Jun/03/2019 Location: Illinois Status: Offline Points: 178 |
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I'm pretty much a novice, but it looks to me like both of those will bleed off oil pressure at the same lift. May or may not be an issue.
I was under the impression that Howard's lifters had a smaller roller to solve this problem. I am currently mulling over the idea of a 1.7:1 rocker and reduced camshaft lift to keep the lifter in the bore. I'm assuming a 1.8:1 LS lifter would result in the pushrods rubbing the head, but this is the line I'm thinking of...
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3904speed
AMC Nut Joined: Dec/16/2015 Location: Mt Status: Offline Points: 415 |
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Yes I have heard Howard is sufficient. He did not have solid in stock. The crower has .18 more skirt, just enough to keep from bleeding. I have never tried Howard, but he told me he has hydraulic roller in stock about a month ago. Lift is commonly cut opposite of lobe. Lobes are usually the same diameter as bearing face. We used 1.6:1 comp steel rocker and had to clearance rocker and head, used 3/8 push rods because of high spring pressure. Not sure how well longer rocker would ride on valve. Good luck and Godspeed
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3904speed
AMC Nut Joined: Dec/16/2015 Location: Mt Status: Offline Points: 415 |
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3904speed
AMC Nut Joined: Dec/16/2015 Location: Mt Status: Offline Points: 415 |
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alfono performance I believe carries isky bushed roller bearing hydraulic lifter. Diamond pistons also. He has regular job but answers his phone after hours, nice guy and smart.
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BassBoat
AMC Addicted Joined: Aug/29/2008 Status: Offline Points: 1718 |
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Sorry if I hi-jacked this thread, it came up when I did a search. I custom design my own engines and custom design my own cams, and am ready to try the expense of hydraulic roller for obvious reasons. They work in modern cars, for high performance and hundreds of thousands of miles, so why not in a classic? I will ask my question a different way, will the Howards lifters shown in this link work for a 7000 rpm .600 lift cam in an AMC?
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Shawn_Watson
AMC Apprentice Joined: Dec/05/2018 Location: Carlsbad, NM Status: Offline Points: 117 |
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If you're wanting to run a hyd/roller at that rpm, keep the valve weight as low as possible. Once you know your valve weight, install height, rocker ratio and lobe specs, you can work with a spring manufacturer like PAC or PSI and come up with a lightweight, conical or beehive with a smaller retainer.
On the pushrod side, use the largest diameter you can get through the head to prevent any pole vaulting over the nose. A hydraulic plunger will eagerly take up any slack and "pump up." Check out this video regarding springs. https://www.youtube.com/watch?v=uHw3mWYgO6M
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Jmerican
AMC Addicted Joined: Mar/29/2016 Location: Seattle, Wa Status: Offline Points: 585 |
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Hyd Roller to 7k? I’m not the person to tell you impossible. Just not realistic. To what end?
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Kreep
AMC Apprentice Joined: Jun/03/2019 Location: Illinois Status: Offline Points: 178 |
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A lot of good info packed in there! Thanks for pointing out the error in my logic, a high lift cam does not have higher lobes, it has a lower base circle. So my idea of running a lower lift cam with a higher ratio rocker to get the same valve lift would not help keep the lifter in the bore. Consider that idea nixed. I've heard good things (on this board) about Nick, I'll probably give him a call.
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Kreep
AMC Apprentice Joined: Jun/03/2019 Location: Illinois Status: Offline Points: 178 |
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I don't look at it as being steered wrong. There is more than one way to achieve my goals and I appreciate the advice I'm getting. I wish I had known about the K1 kit before I bought the 401, but now that I've got it I'm gonna keep it. I've torn the 401 down, it looks like the button on the oil pickup got dislodged - you can see the outline of the pickup in sludge at the bottom of the pan. This killed oil pressure and rod bearings 6, 7 and 8 spun... Everything else looks great, hardly any ridge at the top of the cylinders and no scoring to speak of.
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BassBoat
AMC Addicted Joined: Aug/29/2008 Status: Offline Points: 1718 |
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I run my hydraulic cam to 6500 on a regular basis, some would say you can't do that. Pretty sure hydraulic roller would be no problem going to 7000 since a lot of LS7s out there do that with stock valvetrain. I know my LS3 isn't running out of breath at it's 6600 redline. Might be out of valve spring, but not limited by the hydraulic roller IMHO
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