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Old 08-10-2005, 10:50   #1 (permalink)
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Roller lifters, advice please

G'day Folks,
I've decided to ditch my solid cam & go for a roller set-up. I would appreciate any advice on hydraulic or mechanical rollers. I like the idea of a quiet valve train with hydraulic rollers but I'm not sure if they would handle the revs. My engine is a Clev 383 stroker with AFD 4V's & nitrous. It should rev to 7,500 safely. Will hydraulic rollers handle this? Any comments greatly appreciated.
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Old 08-10-2005, 11:39   #2 (permalink)
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Re: Roller lifters, advice please

Quote:
Originally Posted by tufLTD
G'day Folks,
I've decided to ditch my solid cam & go for a roller set-up. I would appreciate any advice on hydraulic or mechanical rollers. I like the idea of a quiet valve train with hydraulic rollers but I'm not sure if they would handle the revs. My engine is a Clev 383 stroker with AFD 4V's & nitrous. It should rev to 7,500 safely. Will hydraulic rollers handle this? Any comments greatly appreciated.

Hydraulic rollers do not offer any increased RPM range over hydraulic flat tappets. All they do is control the valves more precisely at longer durations and higher lifts due to their ability to use more aggressive ramps.

If you want anything over about 6800 RPM, you want mechanical lifters, whether roller or flat. You'll need increased spring pressure to control the valves at high RPM, so rollers are definitely the way to go. On my recent 357 CID "low budget" engine, I used a flat tappet mechanical camshaft with "cool face" lifters to supply a directed flow of oil over the lobe/lifter faces so that they will live with high spring pressures that would otherwise quickly eat the camshaft.


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Old 08-10-2005, 15:15   #3 (permalink)
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Re: Roller lifters, advice please

Check out the CROWER website, they make a decent solid roller lifter. Im happy with their product. Only thing I noticed is the thicker pushrods fouled on the allen key head that holds the lifter adjoining plate in place. Had to drop down to thinner pushrods.
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Old 08-10-2005, 15:44   #4 (permalink)
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Re: Roller lifters, advice please

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Originally Posted by davis
Hydraulic rollers do not offer any increased RPM range over hydraulic flat tappets. All they do is control the valves more precisely at longer durations and higher lifts due to their ability to use more aggressive ramps.

If you want anything over about 6800 RPM, you want mechanical lifters, whether roller or flat. You'll need increased spring pressure to control the valves at high RPM, so rollers are definitely the way to go. On my recent 357 CID "low budget" engine, I used a flat tappet mechanical camshaft with "cool face" lifters to supply a directed flow of oil over the lobe/lifter faces so that they will live with high spring pressures that would otherwise quickly eat the camshaft.


:davis:
What are these cool face lifters? Who makes them?

Are any solid roller lifters just drop in, not requiring block mods???
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Old 08-10-2005, 16:36   #5 (permalink)
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Re: Roller lifters, advice please

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Are any solid roller lifters just drop in, not requiring block mods???
Comp Lifters go straight in. That's what I run.
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Old 08-10-2005, 18:08   #6 (permalink)
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Re: Roller lifters, advice please

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Originally Posted by northiam
What are these cool face lifters? Who makes them?

Are any solid roller lifters just drop in, not requiring block mods???
These are solid flat tappets, not rollers. The "cool face" is a marketing term that means that they have pressure fed oiling through the lifter body that feeds oil to the face of the lifter and the lobe. The oil passages for the hydraulic lifters pressurizes the body of the lifter and oil comes out of a small passage on the lifter face.

As noted previously, Comp's rollers go right in...as do Lunati's. Of course, they must first be thoroughly cleaned in solvent and prelubed.


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Old 08-10-2005, 21:43   #7 (permalink)
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Re: Roller lifters, advice please

Cool face. What a great idea. I wonder why it's not standard on all hydraulic lifters to reduce friction and lobe temp.
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Old 08-11-2005, 01:39   #8 (permalink)
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Re: Roller lifters, advice please

Ive got the Crower 66218h-16 ready and waiting for my next incarnation!

There are the hi pressure pin oiling ones that are safer at low engine speeds ie;sat nite cruze
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Old 08-11-2005, 03:47   #9 (permalink)
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Re: Roller lifters, advice please

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Originally Posted by xyfmtjoe
Ive got the Crower 66218h-16 ready and waiting for my next incarnation!

There are the hi pressure pin oiling ones that are safer at low engine speeds ie;sat nite cruze
Same, I couldnt find the part number but these are the ones that are recomended for street driven solid rollers.
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Old 08-11-2005, 16:19   #10 (permalink)
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Re: Roller lifters, advice please

Found this on crower web site!
Dont know if suitable for clevo thou. What diameter for clevo?

COOLFACE SOLID LIFTERS
Better engine builders know that cam
lobe and lifter wear is caused by
inadequate oil lubrication at the cam
and lifter surface.
With today’s high rpm, high rocker
ratio and high spring pressures, cam
and lifter failure is at an all time high.
Crower’s all new “CoolFace” lifter
option is a must for these applications.
Features a small diameter oil metering
port (.024") that is precision machined
in the face of the lifter. No significant
oil pressure loss, but significantly
improved cam and lifter longevity.
Crower has a complete inventory of
.842" and .874" diameter lifters to
choose from, including piddle valve,
edge orifice, small chamfer, no chamfer
and lightweight designs. Call Crower
for pricing and availability. Crower also
offers the “CoolFace” option on
competitor’s solid lifters as well. Send
your competing brand lifters in to
Crower for precision EDM machining.
66915X980S
lifters – flat face
66900X980-16
66900X980S-16
66971X980-16
66972X980-16
66915X980S-16
Part No.
.842" (97g) small chamfer
.842" (97g) small chamfer, high seat (+.150")
.842" (75g) LightWeight, no chamfer
.874" (84g) no chamfer
.874" (110g) small chamfer, high seat (+.065")
Description
COOLFACE SOLID LIFTER OPTION
Warning: Block restrictors are not recommended.
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