Roller Lifter Puzzlement


#1

On overhead valve pushrod engines with roller cams, what’s the purpose of that bent bar that appears purposed to hold the two roller-lifters together as a pair? I thought lifters were individual items, not held together in pairs. Or have lifters, roller or otherwise, always been connected in pairs like that?

http://www.jegs.com/i/Crower/258/66291H-2/10002/-1?CAWELAID=1710576551&CAGPSPN=pla&CAAGID=15769068431&CATCI=pla-221923208951&catargetid=230006180037474576&cadevice=c&gclid=CNChoZawz9ACFROUfgodFWoL4Q


#2

Roller lifters have to stay in alignment, that’s what the bar is for. Regular lifters rotate.


#3

+1 to @texases rotating about the cam follower on roller lifters is a baaad thing! The tie-bar is a must.


#4

OK, I see what you mean. Yes, roller-lifters are not as symmetrical as cylinder-shaped normal lifters. The little wheel on roller-lifters has to be pointed in the same direction as the cam lobe is moving past it. Otherwise, well I wouldn’t even want to think about what would happen, it would definitely be bad … lol. … Thanks for the explanation!


#5

Another method used (by GM) is to use a lifter that has two flat sides on the upper end of the lifter which rides in a composite guide with corresponding flat sides

to keep the lifter oriented properly.


#6

The first example is the retro-fit roller lifter for classic engines. Most factory engines that began using roller lifters in the eighties use guide plates for lifters like the one above.


#7

Irrelevant to the question, which has already been beautifully answered by other posters, but I had to laugh when I saw that the Jegs catalog said “Mechanical Servere Duty”. I guess the proofreader was off that day. :grin:


#8

+1 to TSM … not a day goes by that I don’t see an example of that in “print”. You’d THINK spell-checker would solve that problem but nooooo! :wink:


#9

At least it’s easily updated. I see professional signs on businesses during my daily commute that are spelled wrong. You’d think a professional sign maker would at least question the spelling-

A bridal shop advertising COSTUME dresses.
A gas station selling lobster SANWITCHES.
An oriental restaurant advertising Asian CUSINE.

The list goes on…


#10

Maybe the lobsters are guaranteed sorceress-free!:smile: