smallblock chev lifters

[louirdog]

There has been some discusion about small block chev.roller lifters being a smart thing to do to a twin cam moter.I have heard that the oil res. in stock lifters is too small to absorb the shock of a heavy camed moter.Is a crane cams hyd. roller lifter a better selection ? Furthermore there is the issue of metering in the stock lifter? I know that stock liffters are a safe bet but, crane and other aftermarket offer larger bearing surface .

[claydbal]

CURIOUS ALso. the chevy lifters run under big spring pressures, spin over 6000 rpm, do it for years and even when oil pressre is almost zero.

[Photo John]

Interesting, but durability wise, we are talking water jacket cooled vs air/oil cooled. Durability might be different, I would guess...

[SCARYGLIDE]

Hmmm, innovative thinking.
Mongo like that.
Being the SBC lifters are in the heart of an engine, away from the water jackets, that may negate the water cooling effect.
That said, it may be something to look at.

[claydbal]

how bout the rhodes anti pump-up lifters for SBC?

[ktwillys]

you will find that HD buys the lifters from a manufacture that is only a bidder for their product production.

the lifters are made by the exact same company (sorry cant remember the name right now) that makes the GM lifter.. and the specs are whatever HD tells them that they need..

I will bet that they are in fact the exact same lifter as the one GM uses in their engines..
You will also find that HD has for many years used an "off the shelf" product to manufacture their engines and other parts as needed for the bikes.

we used to replace the pistons on the shovel with Chevy pistons, valves the same thing..
there are other things like this but at the moment I cant think of them..


air cool or water cool makes no difference to the lifter...

if you want to know if the spring rates are the same (the spring inside the lifter) look at your valve spring seat and compressed pressures and the lift of the automotive cam...
compare this to the motorcycle numbers and you will have your answer....

easy huh....

[claydbal]

ktwillis, you said a mouthful. MADE TO HD SPEC. i think the biggest trouble is the chevl lifter id designed to run at 30-60 psi oil pressure. Hd twin cams run 16-40 on a motor with no runout and no pump wear.

when we correct the pressure ( i run RRCYCLES billet cam plate and 07 pump) to 30's idle and 40 and up on the road, we move into chevy spec. reverse that-------guys buy the chevy spec lifters and run at 6-8 idle and 30 on the road, or run SE heads with too much spring pressure, or buy a spring set that has too much seat pressure, or let a "builder " set up their heads with unknown spring pressure, this is where we encounter problems.

for the most part, the stock oem B lifters are a great compromise. i ran the ams lifters (hi-lift johnsons) and was thriled for about 3000 miles. problem is, no lifter so far has stayed per spec. they get louder, or, they bleed off overnite, or they pump up at high rpm, no perfect lifter. i would go solids if i could find em. at least the noise would be constant------so if a probleem was developing, i could hear the progression of said problem. as it is, a set of lifters every 5000 miles is not acceptable.

[pwmorris]

I just switched my S&S lifters out for Jims hydro solids on my street bike-and have tested them to 7k at 200 hp-but run straight solids on my race bike-can't even notice the noise......I think the S&S X Wedge motor is running automotive small block parts now-esentially car stuff....funny how things come back around!