GregBBRD

Oops. Pure Freudian slip.

What I meant to say was "polished".

I looked over and saw my jar of Mother's Billet Aluminum Polish and typed the wrong word.

Happens all the time.

Move on...nothing going on here...nothing to see.

928man

james bailey- yeah, I've heard of one guy who bought 2 new 928's and had 550,000 miles on one of them, don't know who though.
Iceman- it would be great to see Gregs shop but I'll wait till I get the bucks together. So you are saying that a lot of Ferraris & Lambos don't hold up under track racing as well as a 928 motor? $40k-50k is a lot to invest but to get 450hp at the crank must be what it takes now, as the dollar is worth less now.
Mike Simard- You built that monster 7liter yourself, I like the looks of the engine with no airbox, must be a monster speed wise, sleeved engine? What would it cost to build one like it today, or shouldn't I ask?

DR

Yep, knew both cars well when i was stil in Atlanta, haven't heard from him in years.

Last I saw his 79 it had over 610K on it in 2000, his wife's 81 or 82 had over 350K. Both pretty much perfectly maintained. The 79 engine didn't have an oil leak or seep to be found. IIRC heads refreshed at 325K on it and was planning to do it again soon. It was my understanding short block was never touched with maybe exception of rod bearings when heads were done.

The 79 suffered slight damage from a Scud Missle attack near Kuwait during Iraq 1 and had to be repainted (it is silver). Lots of fun stories about racking up tons of miles across the desert roads in the region at unregulated speeds. He did say they traveled well inside a C-130 or C-5B on occasion :-)

Tried like heck to buy the 79, neither were for sale and were gonna be passed on to family members only.

Super nice guy, won't mention his name without asking him first. Especially due to the sensitive GOV job he had (or still has??) at that time involving "playing with" shiny birds in space during wartime.

928man

Dave: Interesting story, thats really amazing, 610,000 miles and only had the heads rebuilt @325,000, that shows these cars have great longevity for daily use, makes me think I should drive my cars more instead of the old Saab Turbo, (193,000Miles). By the way I always admired your Euro-S with the S/C,beautiful car, as I've seen it on your company's website many times. Bill

mark kibort

is the special work to build up a stroker, in the motor shortblock or in the intake, heads and tuning. obviously, I probalby have a lower end as good as it can get, but it only puts out 370rwhp/420TQ with 0 tuning and all stock parts. once you do the heads, i think the hp gets in the 400/420rwhp range. it wasnt until the Fan/anderson cars were fitted with the CF intake, did the HP rocket up to 500-520rwhp. certainly, the head work helped along with the larger valves, but the intake mods, throttle body porting, etc, that didnt due much initially, maybe did something when the intake was better matched to take advantage of those mods. (anderson has the dry sump and fan is more stock , yet both make near the same power)

I have to imagine that with tuning that the 520rwhp, as the stock ECU is still being used. PVC pipe MAF, with some fabed, dueal throtltle body intkaes. thats not included in the normal engine build costs of a stroker. so, what is a stroker build? and what does it take to make 500rwhp? can it be done without the CF intake? seems like it should , as less than 100hp per liter is pretty common place with most engines at the track these days!

bigmac

Keep in mind if the car is a1990, the drive-shaft is the weakest part, Murf, broke mine on the way to the dyno after installing a S/C.

Black Sea RD

928 and 944 drive shafts are getting old and many are getting very tired, especially at the splines.

That's why we have replicated them out of a stronger material. Have a few in operation and they are doing well. Pretty soon most of our rebuilt torque tubes will have them. Tired of getting in used up drive shafts that aren't any good for re-sale.

Kind of old news but seemed appropriate for mention in this thread.

blown 87

I wish I would have known, I would have put a new shaft in mine when I did the conversion.

GregBBRD

Now, this is cool. I completely missed this information, so it's not old news, to me. Tell us more.

Are your shafts the "bigger" shafts like in the GTS, or are they like the early shaft?

blown 87

I missed it also, like "Who Knew".

Black Sea RD

Our automatic and 5 speed versions are all 25mm shafts since we didn't want to replicate the neck down portion of the later automatic drive shafts which seem to fracture at the neck down a bit more often.

Figured since Porsche used 25mm drive shafts for all year 928 5-speeds, why change it. Mark A. seems to be doing just fine with his stock 25mm drive shaft so the one we make should be good to go at 25mm.

Sorry Blown 87, thought you knew.

SeanR

Ohhhhhh, new stuff.

Well done Constantine. You need to start a new thread on that so we don't hi-jack this one.

dprantl

Speaking of clutches, the stock single disc clutch was just barely holding on when I was putting down 405rwhp. Even a slight mistake or fraction of a second too much slip while on the power would cause it to slip for that engagement attempt. The stock double-disc clutch is holding fine with the 420rwhp or so my car is now making. Even so, I have a 50% stronger DD pressure plate waiting if I ever want to go to 500rwhp+. Yes, this power figure has been verified multiple times on the highway with a 2009 997TT that I know well

Oh, and Greg, I don't have any idea why Joe sold it, but I am glad he sold it to me

Dan
'91 928GT S/C 475hp/460lb.ft

Mike Simard

I built the 7.0 after being motivated by Todd Tremel. He doesn't post much but Hacker has put up some of his work.
I machined away the stock cylinders and made steel ones with 4.286 bores. It does work well and survives racing where it sees 7700 rpms as I hold it against the limiter to avoid shifting I did other tricks to strengthen the block and I make cams induction etc.
It was too complex to build and I wont do that again. I might make a 'different' block for doing the same thing though. I supply engine builders with parts and don't sell engines myself so if an engine builder come to me with an idea, I might make it happen.

The lack of an air cleaner in the avatar is because that's more interesting to look at than a lid.
I'm on my 3rd airbox design now and expect some new carbon fiber ones based on some models I made to come in any day now. I've completely changed the way I though about airboxes and filter placement. The 'old' one is CF with an oval snout on the front going to a giant filter in the bumper. It sounds great but having the airbox be well designed for handy day to day life is important because it's the most visable part of the engine. If I'm going to sell induction systems I really need to provide a good airbox.

Catfood

This has me curious now. If I wanted to refresh my 180K miles engine before purchasing a supercharger. How much would new rings, gaskets and seals cost. Oh and I would probably do the work myself.