You guys are amazing.
I am on the Benz and Bimmer forum and not seen this kind of help, assistance, great technical opinions, etc.
I am overwhelmed.
Now, I REALLY don't know what to do!!!
Thank you all very very much.
I will let you know what happens pretty soon.
My 87 is actually quite nice as I drove it around today. Stock except for a bit of muffler by-pass which was done by previous owner so I get a bit of a nice rumble and kick.
I have looked on Ebay and other venues to find a 928 without a motor. (One of you offered one, thanks.)
It seems that most people want to keep the engine going!
I can understand why.
My 86 has a turbine sound at about 70-90 that is really awesome.
The rebuilt engine on my 87 lost that airplane sound.

(btw: for those of you who have lots of cars and wonder how to keep them close, I posted a floor plan of a house that has several garages in a very compact way. check it out here halfway down: http://www.benzworld.org/forums/foru...sp?tid=1249877)

 

John
Look at it like this....find a decent blown engine S4...$3-4K...plus the $8-12K for the conversion....so at best your looking at $11k-16k...since you are looking for more bottom end power....try a twin screw supercharger....now thats some bottom end power

http://www.billsworkshop.com/P928S4/supercharger2.MOV
http://homepage.mac.com/jpriv/bill_b...Theater57.html

928 specialists S/C kit is in your price range.....add that to your S4 and you will have that 0-45 power you want!!
https://www.928gt.com/default1.htm

 

There shouldn’t be any turbine sound unless something is starting to fail.

 

Actually mine used to make that sound high in the RPM band too. Like an angry turbine. It was through the intake, not the sound of any iminent failure. I suppose it might actually still make the sound...but you can't hear any of that over the Borla exhaust, certainly not high in the RPM band.

Shame, it was a very cool sound.

I envy you John H...

 

Jeez, that looks like a Lagonda on the left. You poor bas___-!

Doc

 

Doc comments like that from a guy who has a Mondial as I recall Talk about getting no respect...

 

Hmmm, I don't recall Lagonda(or Aston) winning any F1 titles recently/ever. What's wrong with a family Ferrari cabriolet?

I've spent enough time under the dash of a Lagonda to know from whence I speak.

Doc

 

Why not install a Buick V-6. They had something like 10,000 horsepower, or so I've read somewhere. It takes about 3,000 hours and $15,000 to install an SBC into a 928. Why not just go buy an 80s Vette cheap?

 

Rob Budd up in Michigan did a chevrolet conversion; he said it was pretty straight-forward, though he had trouble finding the right bell-housing. Also, he had a strange problem finding adapters to make the cooling hoses fit! It's always the little things that **** you off! Email him for details...

N!

 

My Vote: Stay Porsche power and go forced induction. It will be cheaper and easier in the long run.

 

I understand why people consider pursuing a SBC conversion - thinking then life for thie 928 will be simple for ever after.
But unless you are building a bracket racer, it makes no sense - and certainly not for a 928 in terms of aesthetics. A real appeal of the 928 is not only its curb appeal, but also the "wow" appeal when you open the hood. Maybe the motor is powerful, maybe not, but any 928 motor looks like 200 mph and is truly unique.
SBC motors are common as dirt.
If a replacement 32V motor is out of your budget, opt for a 16V - no shsmr in hsving s 16V om s 32V model. Add a 928 Motorsports Stage II and all that is yours for less than the SBC motor, conversion kit and hundreds of hours mating it all up. A hot, boosted 16V will make all the horsepower you 928 drivetrian can take anyway and we're talking over 400 rear wheel horsepower - that is very streetable and smooth. And you are still driving a Porsche.
The only exception I can think of is if you are building a hot bracket racer - but then going to an all Chevy drivetrain with 4.11 to 5.13 gears etc. It would not cost most to keep it a Porsche, and if boosted a superior car to virtually anything on the highway. Most SBC swap projects, regardless of what they are going into unless another GM car, usually end up a disassembled car and boxes of parts in a garage - until just scrapped out. That is the reality of it.
Mark

 

Drop in a worked over 475hp ZR1 motor - it was designed in europe:

 

say what you will for American engineering, but that LT1 Engine is far more compact than these 5 liters. I for one hate those cam in block engines but they sure make for a much smaller package than the 4 valve M28 engine group. Now what thats worth, well not much really, it is just suprising to see how much larger the porsche engine is. I always thought the chevy would be larger for some reason.

 

Ryan,
Per one of the GB 928 guru's, the 928 motor would be considered a big block by Chevy / Ford standards. To say Porsche overbuilt these motors is an understatement. Who knows, maybe in 1970ish making a smaller block 5.0 from alusil was not possible?

 

yeah thats probably a good way of putting it as a big block, these things arent exactly light weight either, regardless of the all alloy construction. To bad we didnt get more than 5.4L out of them. Although If porsche didnt short stroke every engine for revs I am sure these could be 7.0L engines.

Actually that reminds me, these cars have a relativeely short stroke of what 80mm in 5L form, I am honestly dissapointed the S4's redline at what 6200 and the GT with its so called raised redline of a whopping 6600? with the construstion of the internals and the short stroke I am suprised they didnt get at a minimum 7000 rpm out of these. I am still trying to figure out why these engines make a relatively low power per liter figure considering they are a fairly large 4 valve quad cam setup. I want to place it on the electronic fuel injection, a;though that manifold is supposed to be a bottleneck as well.

66 horsepower per liter is pretty eak for a 4 valve engine, I would think 80 should be easily obtained honestly giving 400 hp from a 5.0L, but no one has yet to find that setup yet, i suppose it isnt for a lack of trying though, for whatever reason they dont have a very high specific output. Somewhat dissapointing honestly.