|
From another forum
anyone using sollid roller lifters on a hydraulic roller cam or even ever tried just wondering if it works or what the difference is. Any info would be great seeing as i have a good hydraulic roller cam i want to use and a new set of solid roller lifters sitting on the shelf There's no advantage to do this, but if you want to try, you need to understand the differences. A hydr lobe profile is designed to open the valve at .004"-.006" lifter rise, so if you're going to run mechanical lifters on it, you need to make sure the Hot Lash is set between .006" and .009" with a 1.5 or 1.6 rocker, or .007"-.110" with a 1.7 rocker. This will keep the opening and closing valve velocities at where they were designed to be. Most people think the opening and closing velocities on a hydr cam are milder then a mechanical cam, but that's not always the case. Some of the more aggressive hydr roller profiles have velocity/acceleration rates up to 3 times higher then similar sized mechanical roller cams, because they can rely on the dampening of the hydraulic lifters to control valve bounce. If you try and run one of these hydraulic profiles with mechanical lifters, it can actually be much harder on the valvetrain, and require more spring pressure then a comparable mechanical roller profile. Originally Posted by Horndog View Post On a solid roller set up, it is good to run a "tight lash" cam on vehicles that see plenty of street driving. The theory behind this that with the minimal lash, the valvetrain (cam, lifters, pushrods, rocker arms, and valve stem tips) won't get pounded into submission because the lash (gap) between the roller tip of rocker arm and the valve stem tip is much smaller than a "true" solid roller cam. This is actually false. The reason the tighter lash is easier on the valvetrain, is because the velocity/acceleration is lower at the tighter lash point. If the cam is designed with a constant velocity lash ramp, the velocity/acceleration at the lash point won't change with the tighter lash, so it won't be any easier on the valvetrain. It's all about the velocity/acceleration rates at the point you lift the valve off the seat, and when you seat it back down. The amount of lash is irrelevant. If's like you were bouncing on a trampoline, and you hit your head on a 9 foot ceiling, compared to hitting your head on an 8 foot ceiling. The distance you traveled is irrelevant. The pain comes from the force you hit the ceiling with. |
Originally Posted by MILD THUNDER
(Post 4423265)
From another forum
|
Originally Posted by mike tkach
(Post 4423174)
what are your on the seat&open pressures?
Originally Posted by MILD THUNDER
(Post 4423265)
From another forum
|
That's right where I'm at with lash on my hd cams and same springs. I like to know when the lobe is up top the valve is all the way open. Got sick of lifter failure on an aggressive lobe. Ran that way on other engines for years with no trouble.
I know Jims not a real fan of hd lifters either. |
Competent machine work. Never Fails.
|
4 Attachment(s)
Originally Posted by MILD THUNDER
(Post 4423077)
Did you notice any abnormal wear on the lobes, or valveseats Jason?
The lobes look great. Just witness marks. Nothing that presume wear or lifter bouncing. [ATTACH=CONFIG]553294[/ATTACH] . I pulled the valves out of cylinder 1 and it doesn't look sunk in. Intake looks great Exhaust has a bit of carbon build up. [ATTACH=CONFIG]553295[/ATTACH] . I pulled another cap to look at the bearing and it also looked good. The top brown is oil on the bearing that I didn't clean off. [ATTACH=CONFIG]553297[/ATTACH] . Also, I always was concerned about starting my engines after sitting all winter without priming them. Great film of oil still on crank and bearings. Will not worry about that again. Kind of surprised actually. [ATTACH=CONFIG]553296[/ATTACH] |
Originally Posted by getrdunn
(Post 4423285)
That's right where I'm at with lash on my hd cams and same springs. I like to know when the lobe is up top the valve is all the way open. Got sick of lifter failure on an aggressive lobe. Ran that way on other engines for years with no trouble.
I know Jims not a real fan of hd lifters either. |
943's
That's to bad about your engine. You'll have it back and going in no time. Still amazed with your bearings and journals. People always think I'm anal when I build an engine cause I will only assm in a very clean environment and clean and reclean each and every piece. Going together for the first time and couple of runs is what I have found to be the worst on the rotating assm's and cylinder walls. At the same time I've seen guys throw them together like a lawn mower and last forever but makes no sense to not take every precaution during assm. I'd say yours is proof. |
Originally Posted by Rookie
(Post 4422846)
I have no idea brand bearing, something Jim picked up for me. I'll mic it up later. I run them a little loose. Mobil 1 15w50 changed at the start of every summer. I only use maybe 1.5qts of oil for both engines a season. I do remember chucking the cranks up on Jim's lathe and polishing them up to 600 or 800 emery cloth,
[ATTACH=CONFIG]553249[/ATTACH] |
I have those in my builds as well. Just told Mike T this about 2 weeks ago. I really never hear anyone on the Marine side using ACL's. Just had to post.
|
| All times are GMT -5. The time now is 05:28 PM. |
Copyright © 2026 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.