Carl Fausett

We just disagree - and that's OK.

FBIII

This arguement is not comparing apples to apples. It would be one thing to increase the stock stroke engine 225 RPM but quite another issue increasing RPM's on an engine that has received a significant increase in stroke. What's the red line on the GTS engine? Is it less than a GT? I don't know the answer to my question, but it might give an indication of what Porsche felt were the dynamics of increasing stroke.

Vilhuer

GTS revs to 6600 IIRR.

Carl Fausett

Not at all. I research, I read, I study, and I form my own opinions. Sometimes they align with previously mentioned opinions, sometimes they do not. Some of my opinions come from my previous experiences with automobiles.

I becamse a ASE certified Master Mechanic at age 19 (only they did not call it that way back then) and I have many years of experience working on all makes an models (foreign and domestic) as both a mechanic and a racer.

If you look at the growing list of products that we have invented for the 928 that never existed before.... maybe its a good thing that somebody looks at this car with new eyes?

...or another way to look at it... if we all just regurgitated the same o' same o' explanations for things, what would you gain or learn from each other?

Vive' la differance!

heinrich

Guys stop prodding Carl I read his first post as nothing more than an expression of concern and a reminder to be careful. I DO NOT CARE about the history here, nnnnkay? It seems Swaybar your reply was a little on the poke-the-bear side, where Carl was just mildly expressing his thoughts. I'm looking at all of this and thinking you guys are arguing over nothing

heinrich

LMAO Dude

Carl Fausett

No problem, Sterling. I would totally go with the opinion of a good, reputable engine builder, and in this case, one that has looked over all the componant parts, too.

Carl Fausett

(here I go again) we do not have lifters - that denotes a pushrod motor. But, its one of those terms that gets mis-used a lot and eventually means "anything that rubs on the cam and opens a valve"

We have "cam followers" as they are called. And the fact that Porsche designed our motors with OHV and OHC is one of the good reasons why we can rev as high as we do.... pushrod motors have a more difficult time at high revs.

Anyway... past all that - has anybody seen solid followers for the 928? I never have... and how the heck would you ever get at them to adjust them?

BC

Hi Carl. 7000rpm on a 7.0L smallblock with pushrods and "lifters". Quite a few pushrod race motors go to 8500rpm. It takes alot of work, if I read HotRod magazine correctly, but its done.

Well, the 951 guys have them available. They look basically like drilled out followers you see on your 78. Then a 2.5 inch hole is drilled and tapped for a cap that screws in. YOu take out the cap and do the adjustment (shims). It looks complex, irritating, and very useless - unless you count the fact that any new "follower" you can buy for the 2V porsche heads (928/944) are "soft" and are not lasting at all with higher spring tensions. FYI.

God help us with the 4V followers (I also call them tappets, which works just find for me. You don't need to go wikpedia on me.)

Jim bailey - 928 International

The 944 GTR Turbo trans am engines 4 cylinder 650 hp used solid valve tappets 2 valve heads with lash caps used to adjust has round acccess holes machined into the cam housing with screw in seal plugs. Adjustment was quite time consuming... According to the Project 928 book .. Of course the 928 wasn't designed for high rpm values as such since they were contrary to the basic concept which was aimed at fulfillment of the stiffest emissions and noise regulation. ....The projected hydraulic system was fitted to a four cam version of the six cylinder race engine and entered in two events....this engine with hydaulic valve play adjustment even reached 8,200 rpm without the slightest trouble and all doubts were banished " Just some interesting history. A Porsche racing engine of the 1970s like the 912 engine in the 917 made peak power at 8,400 Rpm So when Porsche speaks of a "low rpm engine" the answer might be compared to what !

SwayBar

I'm not sure that's a good thing...

Really!

Come on!

Flip open your workshop manual and tell us what Porsche call them. (..goto 15-4 and look at No. 26)

What does No. 26 have for it's description?

Anyone?

Bueller?

Just for kicks, guess what the redline is of the stock, push-rod 2-valve LS7 C6Z06 engine is?

FBIII

As much as we love to dump on chevy engines, these low tech engines have always thrived on RPM's. I can't ever remember a design or structural flaw inhibiting their ability to rev.

heinrich

You either ARE Lagavullin or you are his twin.

FBIII

I would line up with Carl on the lifter issue. Overhead cam engines have tappets or followers not lifters. Its possible the workshop manual got screwed up in the translation. If not I would still disagree with their choice in words.

BC

Hmmm. I don't know H. Lag (paul) was in Wisconsin (packers). Swaybar's avatar notes have "chicago bears" in there. Thats would be paramount to being a "commie pinko" in the mccarthy era.