pjburges

Hi all,

I've noticed a few here have converted their 928's to a solid lifter setup (mechanical). I'm doing the same to a 944S right now which uses a nearly identical cylinder head. Would anyone be willing to share what kind of valve lash they are running on the intake and exhaust lobes?

I'm thinking of shimming to .004" intake and .007" exhaust - but I'm not sure if these numbers are realistic. Any help is appreciated guys! Thanks!

RKD in OKC

You need to talk to the guys at Lindsey Racing. They are the 944 solid lifter dudes.

pjburges

Here's some pics to entertain everyone on the process:

Lifters are 35mm solids off the 034-Motorsports website with .195" shims (which I have to machine down to give the correct "lash" plus machine the skirts to fit the valve stems correctly)

rexpontius

wow, that looks impressive.

But what would be the advantage of solid lifters?

Randy V

I'm thinking you'd get better info on the 944 forum instead oF here.

Were you banned from there?

lol

mark kibort

Good luck with that! What is the problem with the normal lifter?

123quattro

With the correct cams/springs you can spin to 9000+ rpm.

pjburges

Nah - but most 944 owners that have done any serious mods to their car are Turbo owners (8V head like the early 928's) which is not what I've got. - People with S2's and 968's with mods like this are few and far between. Wheras - I should imagine the 928S4 and GTS guys may have a little more dough to spend - and build crazy stroker supercharged high dollar items where the solid lifters would be justifiable. Quote from lindsey racing for solids is over 1K - no 944 owner will let go of that kind of cash easily.

I would ask Mike - but these aren't his lifters, a head he's done work on, his shims or anything else - so he doesn't have much reason to give me a hand. I agree though - he does seem quite knowledgable.

The reason I'm going to solids is A) some of my hydraulics were going bad B) they are filled with metal shavings anyways C) This is just cooler. Maybe I'll put Webers on next!

The hydraulics were more expensive than these cost me, and word is they are being build in China now. These are the exact same lifters you would use in a 928 32V fyi!!

toofast928

I think its a great idea. I would recommend .009" and .012" especially on turbo. Since this is an experiment, being too big with the valve lash just makes noise. Being too small burns valves.

mark kibort

oh, thats a solution looking for a problem as well. show of hands please. who wants to spin their 928 motors to 9000rpm??? anyone anyone....... Bueller???

blown 87

Hang around for a bit, you may find we are just as cheap as the 944 guys.

WallyP

It's not that we are cheap, it's just that normal maintenance/repair doesn't leave much for fun mods...

pjburges

At the time when I bought these from 034Motorsports it cost me $390 including the shims. Compare that to $540 for the Chinese hydraulics on pelican-parts. If you were to do this for the 32-valve V8 in the 928 it would be $780 for solids from 034 or if you had to replace lifters in your 928 and kept OEM hydraulics it would cost you $1080 for chinese INA lifters. I don't plan on ever revving this 4-pot to 9K!! The valvetrain will be lighter, so it should rev better, and it will change the cam profile a bit perhaps for the better perhaps for the worst. I'm gonna use the factory cams. My main concern is what to adjust the lash to - especially on the exhaust valves.

Hilton

Greg Gray wants to spin his high - he already has a solution for adjustable solid lifters in his 928 engine.

To the OP - hang in there. The people who're serious about engine building and will be both interested and conversant will show up

Mike Simard

I'm a cam maker and think it's cool to hear about someone interested in solids but I'm surprised at your reasons. Alot of 928 guys have been using a VW INA lifter which is lighter and cheap too, something like 15 each? China is a real concern and I thought the INAs weren't made there yet, just Germany or South America. Do you have any information on the China link? That would be bad news, we need to find out.
Speaking of China, that might actually affect your lash! If you use original Porsche valves and have high confidence in the valve job trueness, you might be able to run less lash on the idea that it's less likely to sink into the head. Modern replacement valves ARE made in China and DO suck in material and finish. You might want to run a little more lash to allow for settling.
Of course your cam is not well suited to this and it's a horrible idea anyway but interesting at least The Porsche ramp design is suited for hydraulics and doesn't have what is required for a solid lifter.