Roller Followers

[iacs_hsv]

Anyone any views on the *correct* orientation of the roller followers i.e. oil feed faces valley OR oil feed faces bore?

My LS1 had a mix from the factory

Edited by iacs_hsv on Sunday 1st March 10:35

[stevieturbo]

It doesnt matter. The groove around the lifter ensures they get oil all the time.

[iacs_hsv]

Thanks Stevie - Aware of the oil relief around the lifter, perhaps I should have used the word *preferred* rather than *correct* (you know how it is with engineers: if they go in both ways, I want them all to be the same - and understand why)!

Was curious if anyone had knowledge on pump-up susceptibility one way or the other?

Edited by iacs_hsv on Monday 2nd March 12:46

[iacs_hsv]

Perhaps lifter orientation has more to do with drain down rather than pump up? If the oil feeds are facing towards bore, the oil could drain down while the motor is shutdown and require a few miles to refill following startup resulting in startup tick and possible reduced power?

Thoughts anyone?

[stevieturbo]

iacs_hsv said:

Was curious if anyone had knowledge on pump-up susceptibility one way or the other?

In what respect ?


The lifters go in either way....it really doesnt matter.

[iacs_hsv]

"Older lifters that may drain out (even new ones can if the little hole in the side faces down when you have hot oil) and require 8 miles of driving to pump up may cause more wear in the valve train if adjusted too loose?"

Quote from http://www.type2.com/library/engineg/hydral2.htm

Just someones opinion but seems to make sense to me...

[Boosted LS1]

^ But that link has nothing to do with which way the bleed hole faces apart from the bit near the end, lol.

I face my bleed/supply holes towards the rear of the block just in case the lifters prime sooner but in reality it probably makes no difference whatsoever, like Stevie says. Oil will flow the easiest route first (down the gallery) before pumping up lifters.

Edited by Boosted LS1 on Tuesday 3rd March 16:07

[iacs_hsv]

Boosted LS1 said:

I face my bleed/supply holes towards the rear of the block

Now you've really confused me Mike. The stock lifters have a bleed/supply hole that is in-line with the roller; therefore, at 90 degrees to cam - so how can you face them towards the rear of the block???

Stock lifter: http://www.iacslimited.com/hsv/images/DSC04250_S.J...

[monkfish1]

iacs_hsv said:

Boosted LS1 said:

I face my bleed/supply holes towards the rear of the block

Now you've really confused me Mike. The stock lifters have a bleed/supply hole that is in-line with the roller; therefore, at 90 degrees to cam - so how can you face them towards the rear of the block???

Stock lifter: [url]www.iacslimited.com/hsv/images/DSC04250_S.JPG[/url]

You cant. As you suggest, its either towards the bores or away. I normally put them facing the gallery, but you find them either way round.

[Boosted LS1]

You can. Guess it depends on who made the lifter. I've not seen a lifter like that for years, in fact I can't recall having had one looking quite like that. Maybe the Oz ones are different to the US lifters. Mine certainly look nicer externally

I've been fitting them with the bleed hole rearwards before the ls2 was invented so genuine GM(stock)ls1 lifters are freely available with a bleed running perpendicular to the cam.

ETA: Here you go, this lifter is 5 years old.

Edited by Boosted LS1 on Tuesday 3rd March 10:11

[iacs_hsv]

Ah! See your point now, are those stock GM offerings (look similar to Morels)?

Will fit replacements facing valley (minimise drain down and Rogers experience) OR block rear whichever get delivered.

[Boosted LS1]

^ Yep, they are stock GM from the US. I've been using these since 2001 or thereabouts. I don't really recall your lifter but there's something familiar about the stamped numbers. I think I've had them here but years ago in an engine I dismantled. Maybe it's the type previously fitted to the first generation of ls1's (98 MY or thereabouts, peripheral head bolt engines). If those lifters are still current then they could be specific to Oz or they hold a lot of old stock down there. The insides will no doubt be the same.

[iacs_hsv]

Mike, you got a new set in stock for me?

[Boosted LS1]

iacs_hsv said:

Mike, you got a new set in stock for me?

Give me a call if you like. I stock those.

[stevieturbo]

iacs_hsv said:

"Older lifters that may drain out (even new ones can if the little hole in the side faces down when you have hot oil) and require 8 miles of driving to pump up may cause more wear in the valve train if adjusted too loose?"

Quote from http://www.type2.com/library/engineg/hydral2.htm

Just someones opinion but seems to make sense to me...

8 miles of driving....sounds like a pretty st engine.

I'd like to think my engine has oil pressure within milliseconds of starting, and hence lifters doing what they should.

[stevieturbo]

iacs_hsv said:

Ah! See your point now, are those stock GM offerings (look similar to Morels)?

My Morels didnt look like that. My standard LS7 lifters did though.

[Boosted LS1]

I took some lifters apart and iirc they have a lower chamber which once primed can't drain down. The upper chamber is what provides adjustment and it's pretty tiny as I recall so will fill quickly.

[iacs_hsv]

stevieturbo said:

iacs_hsv said:

Ah! See your point now, are those stock GM offerings (look similar to Morels)?

My Morels didnt look like that. My standard LS7 lifters did though.

OK then, they look MORE similar to Morels than my GM stockers!

[MyM8V8]

AFAIK LS7 lifters are the standard ones fitted in these engines, well LS2 and up anyway. I have just ordered some Cadillac CTSV "racing" lifters to see what they're like. A little cheaper than the Morels, which do look like a good piece. Both are supposed to resist collapsing at higher RPM.