roller lifters?
- Thread starter brent
- Start date
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- Melting in Texas
Gains, I'm sure no matter what I tell you about gains on these someone will come back and say what they believe and it will be the exact opposite. My advice is go out to Google and look around, better valve operation, lower friction, less noise, and maybe a little HP are the ones I have heard.brent said:
Drawbacks, more pieces, they have more bit to keep them orientated, they have at least one more moving part the roller. By themselves you get only some of the valve train benefits, roller rocker are the other side. Depending on what you want to put them in to you might have to change your camshaft, I believe some change the durations from stock to much, i think that maybe because there taller than normal lifters. Someone will correct this if i'm wrong, i have never converted only the bottom end of the valve train, it was all or nothing.
Roller lifters have to be held in an orientation so that they don't turn on the camshaft. I have never seen a set just drop in place of normal lifters without extra hardware on them, something like a brace or bracket that keeps them facing a specific way. The ones I bought for my Mustang had a specific insertion so that the oil ports lined up on the lifter itself so it wouldn't become oil starved.brent said:
I got to ask if this is for the 4.0l, i dont think the deck hieght makes it possible to put roller lifters in, I might very well be wrong here (if i am please someone send me a piture), roller rockers i have seen but not lifters.
Andy
I'm going to go get under cover now because i'm sure theres a crossfire coming in.
5-90
NAXJA Forum User
- Location
- Hammerspace
As I recall, the lifter pockets in the 242 block will allow roller lifters to carry "tie bars" to maintain their orientation, but mushroom lifters may be easier...
As far as I have been able to determine, no-one actually makes roller lifters - although I haven't looked in a bit. I may be wrong now, but I've got larger matters to concern me at the time (getting back into calculus, for instance.)
I'd like to see them - a principal benefit for us would be the allowance to run more aggressive camshaft profiles, and increase "the area under the curve" - or the total time the valves are open - and the concurrent increase in VE and output.
I would honestly think that roller lifters would be more useful to us than roller rockers - I have commented extensively on roller rockers, and see no need to repeat myself at this time. My comments should be easy to find here with a brief search (although I do plan on writing a monograph on the subject - roller valvetrain in general - for the Tech section of my own site.)
5-90
As far as I have been able to determine, no-one actually makes roller lifters - although I haven't looked in a bit. I may be wrong now, but I've got larger matters to concern me at the time (getting back into calculus, for instance.)
I'd like to see them - a principal benefit for us would be the allowance to run more aggressive camshaft profiles, and increase "the area under the curve" - or the total time the valves are open - and the concurrent increase in VE and output.
I would honestly think that roller lifters would be more useful to us than roller rockers - I have commented extensively on roller rockers, and see no need to repeat myself at this time. My comments should be easy to find here with a brief search (although I do plan on writing a monograph on the subject - roller valvetrain in general - for the Tech section of my own site.)
5-90
5-90
NAXJA Forum User
- Location
- Hammerspace
I'd appreciate pictures, measurements, and a copy of the installation instructions, if you would... If not, maybe we can work something out where I can borrow one for a day or so, and measure it myself (I don't have anything opened up to where I can get to the lifters right now, and measurements on the roller lifter would be different anyhow...) I'd be willing to cover shipping both ways.
Roller lifters are usually tied together in pairs with a tie bar of some sort - you can check Crane, Crower, or pretty much any other major valvetrain performance MFR for pictures. I'd think yours would be the same, since I recall the lifter valley being somewhat separated by cylinder anyhow. It doesn't matter what the lifter is tied to, just so it can't rotate significantly (since the roller is cylindrical.)
I still say the principal advantage to a roller lifter, in our application, would be allowing a more agressive cam profile and greater "open" time for the valves. We don't run our engines fast enough to make the decrease in parasitic drag significant - we'd get much the same benefit from a mushroom lifter as we would from a roller lifter - it's just that roller lifters are more popular (I haven't seen mushroom lifters in 15-20 years or so.)
The main advantage we'd get from roller rockers would be the fact that the rocker is more solid, and therefore valvetrain geometry would be more consistent (due to the elimination of flexion in the stamped sheetmetal OEMR rockers.)
I'm not saying that there aren't any advantages to rollerizing the valvetrain in the AMC 242, but the advantages would not be what the SBChevvy crowd gets (more consistent operation at high crankshaft speeds.) It's doable, but how much are you willing to pay for it?
5-90
Roller lifters are usually tied together in pairs with a tie bar of some sort - you can check Crane, Crower, or pretty much any other major valvetrain performance MFR for pictures. I'd think yours would be the same, since I recall the lifter valley being somewhat separated by cylinder anyhow. It doesn't matter what the lifter is tied to, just so it can't rotate significantly (since the roller is cylindrical.)
I still say the principal advantage to a roller lifter, in our application, would be allowing a more agressive cam profile and greater "open" time for the valves. We don't run our engines fast enough to make the decrease in parasitic drag significant - we'd get much the same benefit from a mushroom lifter as we would from a roller lifter - it's just that roller lifters are more popular (I haven't seen mushroom lifters in 15-20 years or so.)
The main advantage we'd get from roller rockers would be the fact that the rocker is more solid, and therefore valvetrain geometry would be more consistent (due to the elimination of flexion in the stamped sheetmetal OEMR rockers.)
I'm not saying that there aren't any advantages to rollerizing the valvetrain in the AMC 242, but the advantages would not be what the SBChevvy crowd gets (more consistent operation at high crankshaft speeds.) It's doable, but how much are you willing to pay for it?
5-90
5-90
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- Location
- Hammerspace
Can you scan and email? I'd have to go through a fair bit of setup to receive faxes. I do appreciate it - and if you can't scan and email, we can see about getting a fax going somewhere...
5-90
5-90
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