Hemi Hydraulic Lifter designs explained

[Tim Garceau]

Discuss.

 

[seabrook]

Thanks for this, very good information!!!!

 

[Wild one]

Discuss.

MMX set that video up so the competitors lifters are going to fail,there's been a bunch of comments about that video on the facebook pages,lol.

 

[Tim Garceau]

That’s why I stay off Facebook Rick, just unemployed conspiracy theories galore.

unless MMX has a dog in the fight with a sponsor but the differences are right there

 

[Wild one]

That’s why I stay off Facebook Rick, just unemployed conspiracy theories galore.

unless MMX has a dog in the fight with a sponsor but the differences are right there

Apparently you need a cam with over 685 lift to uncover those holes Tim,nobody but the high end guys who are spinning a Hemi to 9,000 rpm has a cam with in excess of 685 lift. After that video hit,guys started posting up their oil pressures at 7,000 rpm using the TSP lifters and they're still running 70 psi of pressure.The general consensus is MMX is feeling a money pinch,and this video was made to generate sales for Webber/MMX. One guy even put Webber on the spot and he had to admit they hadn't actually tested this theory in real life,and they might have to go back to the drawing board and do an actual test on a running engine,besides who uses a cheap leak down garden sprayer for a oil pressure bleed down test,lol. Bleed down lifters are nothing new,they've been around since the mid 70's,i used to run them in my radical big block Chevy's back in the day,they made a wild cam semi livable on the street,they were called Rhoads lifters back then,lol

 

[Tim Garceau]

I’ll dig later but are there any passage differences in the Melling 2016+ Lifters vs 2010-2015?

 

[crackerjack1957]

Apparently you need a cam with over 685 lift to uncover those holes Tim,nobody but the high end guys who are spinning a Hemi to 9,000 rpm has a cam with in excess of 685 lift. After that video hit,guys started posting up their oil pressures at 7,000 rpm using the TSP lifters and they're still running 70 psi of pressure.The general consensus is MMX is feeling a money pinch,and this video was made to generate sales for Webber/MMX. One guy even put Webber on the spot and he had to admit they hadn't actually tested this theory in real life,and they might have to go back to the drawing board and do an actual test on a running engine,besides who uses a cheap leak down garden sprayer for a oil pressure bleed down test,lol. Bleed down lifters are nothing new,they've been around since the mid 70's,i used to run them in my radical big block Chevy's back in the day,they made a wild cam semi livable on the street,they were called Roads lifters back then,lol

I remember a certain brand (can't recall name) back in the 80's that came out with a hydraulic lifter that was suppose to have a different bleed down rate that would allow sb chevys to run around 75000.
Was suppose to bleed off like a solid lifter at high rpm & build pressure at low rpm.

https://www.enginebuildermag.com/2012/01/hydraulic-camshafts-and-lifters-101/

 

[Wild one]

I remember a certain brand (can't recall name) back in the 80's that came out with a hydraulic lifter that was suppose to have a different bleed down rate that would allow sb chevys to run around 75000.
Was suppose to bleed off like a solid lifter at high rpm & build pressure at low rpm.

https://www.enginebuildermag.com/2012/01/hydraulic-camshafts-and-lifters-101/

You're close CJ,except opposite,they were called Rhoads lifters back in the day,and they bled off/leaked down at lower rpm,and pumped up at higher rpm. The idea was they'd bleed down and allow more plunger movement at low rpm,which in turn reduced duration and overall valve lift,as the rpm came up they would pump up and then supply all the lift and duration that had been ground into the cam. They'd make a radical cam semi livable on the street,it wouldn't be a great cam at low rpm,but it'd mean the difference in getting across an intersection if the light went red,lol

 

[crackerjack1957]

You're close CJ,except opposite,they were called Rhoads lifters back in the day,and they bled off/leaked down at lower rpm,and pumped up at higher rpm. The idea was they'd bleed down and allow more plunger movement at low rpm,which in turn reduced duration and overall valve lift,as the rpm came up they would pump up and then supply all the lift and duration that had been ground into the cam. They'd make a radical cam semi livable on the street,it wouldn't be a great cam at low rpm,but it'd mean the difference in getting across an intersection if the light went red,lol

Yep, you are right.....ass backwards as usual....light came on as soon as I seen the brand....LoL