[Jim Moshier]

Just reading the other post on lifters has anyone tried the New Comp Cams Evolution Hyd Rollers with the cartridge and where they might be coming from? It sounds like it is an interesting design and quiet, we will see!

Part # CCA-85701-16
COMP Cams®Evolution Hydraulic Roller Lifters are the first lifters EVER created using the newly patented Hydraulic Cartridge Technology (HCT)! This revolutionary design offers the most reliable performance of any lifters in the aftermarket.
.842 diameter; 2.475 seat height
.150 travel / preload between .050" to .100"
Will not clear factory valley pans

[rohrt]

I asked the same question a while back. Got no response and went with Johnson lifters instead. It seemed like there just more success there.

I like the concept too.

[Formulajones]

Originally Posted by Jim Moshier

Just reading the other post on lifters has anyone tried the New Comp Cams Evolution Hyd Rollers with the cartridge and where they might be coming from? It sounds like it is an interesting design and quiet, we will see!

Part # CCA-85701-16
COMP Cams®Evolution Hydraulic Roller Lifters are the first lifters EVER created using the newly patented Hydraulic Cartridge Technology (HCT)! This revolutionary design offers the most reliable performance of any lifters in the aftermarket.
.842 diameter; 2.475 seat height
.150 travel / preload between .050" to .100"
Will not clear factory valley pans

Did you buy a set to try??

[tom s]

Not sure if they have shipped any yet?They look like the old Shaver lifters made in SoCal but with the insert.Tom

[Jim Moshier]

This is what they look like and I haven’t had any time with them that is why I asked. I have 2 projects going right now so more info would be good. Thanks guys!

Jim

[tom s]

Exactly like the Comp Shaver lifters out side.Note the lifter body does not go much past the roller pin.Tom

[grivera]

Thread about them here : http://forums.maxperformanceinc.com/...93#post6327193

[Tim Corcoran]

I was told by someone a very reputable Pontiac engine builder that the best hyd roller for Pontiac currently on the market are made by Johnson Lifter, not Hy-Lift Johnson but Johnson. They are expensive most would not be willing to pay that much for lifters, but you get what you pay for.

[25stevem]

I can’t see why they will not clear a non EGR factory valley pan.
They don’t look overly tall to me!

What am I missing here?

I mean I can see a issue on a 301 motor for sure!

[KEN CROCIE]

Was told by my comp rep:
They are based on the comp solid lifter .
they are about .200" taller.
They have a .750" roller as opposed to the .700" dia. used on the convential roller lifter {857-16}.
The adjuster is removable due to the taller lifter body.
Available soon 2-3 weeks.
Priceing $ 90+ more than 857-16 (WD price sheet) actual price could vary.

[KEN CROCIE]

Standard pushrod seat height

[Formulajones]

That all sounds pretty good Ken. I especially like the bigger wheel

[Formulas]

a bigger wheel will change duration on the same lobe as a smaller wheel ?

[chuckies76ta]

Originally Posted by Formulas

a bigger wheel will change duration on the same lobe as a smaller wheel ?

If I had to guess, which is what I'm gonna do, I'd guess NO. Pushrod will change lengths.

[Formulajones]

A lot of benefits, no downside I'm aware of.

One Billy Godbold talks about is the lobe constantly trying to push the lifter back and move the camshaft around as it climbs the lobe, so the bigger wheel you have the less pressure angle you have and more force going straight up the pushrod, so less goofy stuff happening in his words.

[Formulas]

a larger wheel is in effect like putting a wider lifter on a flat tappet cam the lobe will come in contact with the lifter sooner in rotation and leave contact later, and thats duration

[chuckies76ta]

Originally Posted by Formulas

a larger wheel is in effect like putting a wider lifter on a flat tappet cam the lobe will come in contact with the lifter sooner in rotation and leave contact later, and thats duration

So what are you saying? or are you answering your own question?


Yes or no!

[Formulas]

stating the obvious but looking for confirmation or an explaination to the contrary backed by IQ. not a guess i can get that from my dog

[chuckies76ta]

Originally Posted by Formulas

stating the obvious but looking for confirmation backed by IQ.

IQ Now your just showing your true colours. Lol.

[Dragncar]

Originally Posted by Formulas

a larger wheel is in effect like putting a wider lifter on a flat tappet cam the lobe will come in contact with the lifter sooner in rotation and leave contact later, and thats duration

It would take a very special cam for wider lifter to have any effect in a sft situation.
A larger wheel will get the valve opening sooner and closing later with a roller cam.
With a sft, with say a .842 lifter, as long as the cam is making contact inside the edge of the lifter circle how could a larger lifter make a difference. ?
A sft cam would have to be so large as to dig into the edge of a .842 lifter for a .904 lifter to be of any use. Never heard of it being done either.