hacker-pschorr

This is still the 928 forum, isn't it? Since when has that ever come into play?

Fabio421

That swap has been discussed here before. Pretty cool.

Imo000

You are assuming it's easy to find a Chevy engine in Europe. Over there this is probably the most cost effective way to do this. They bought a totaled M5 and used it as a donor.

Reminds me of the 911 VW bus conversion.

IcemanG17

a 5.0L 32V V8 with 394hp.....thats not worth the trouble of an engine swap...you can get that much power out of a 5.0L 928 engine fairly easy.....very easy with boost!!!!

I wonder if the BMW engine is lighter?

EspritS4s

Good point, I hadn't considered that.

rexpontius

Personally, If I really would have to choose another engine, I guess it would have to be one of these:

hacker-pschorr

Funny you should post that, I'm considering dropping a 928 engine into an 380SEC I have with bent valves.

Randy V

Hood pins FTW!

lol

RyanPerrella

what language was everyone blabbering in?

123quattro

I would bet it's 100+ pounds lighter. 928 engines are boat anchors.

IcemanG17

I know the S65 4.0L V8 that was in my E92 M3 was quoted as lighter than the old 3.2L 6 cylinder? I think it was 60lbs lighter? I'm not sure how much the 5.0L engine weighs?

Cheburator

Hmm,

The S62B50 weighs at 225kgs all in. It is a crap idea to bolt in a stock M5 motor. Rarely makes the quoted 400Bhp, very sensitive to MAF ageing - it has two of them and also well known VANOS (variable valve timing) issues. Drop some money on the motor - around $12,000 - get steel liners pressed in - the bores are siamesed and a known weak spot on high power motors - ask Dr Nick, who is currently running a 500bhp one, how he knows...

So, a set of steel liners, higher compression pistons, new headers - the OEM manifolds make the early S/S2 cast iron ones on our cars look sophisticated, new rods, new cams, vanos delete and a remap and you see reliable 500bhp at the crank for endurance racing. The most powerful S62B50 was a Nowack one installed in a race 850CSi, running 560Bhp... Lasted all of 10 laps in the 2006 Nurburgring 24hrs. Their other car - a E46 M3 GTR with just a 500bhp version of the same engine finished in the top 10...

Overall, not a very cost effective method to add bhp to your 928, but cool none-the-less...

fbarnhill

Yes, I know that BMW engine, and what I remember most is that you could almost see the gas needle moving when you drive it. However, what a thrill.

mark kibort

we are rebuilding a couple of them right now. my friend (M3 racer buddy) has an M5 that lost compression in one cylinder. he got an entire engine for $4k. (everything). he dropped that in, and ran like a raped ape. all he had done was clean up the intake with a little porting, and used a new ECU flash. we were guessing near 450rwhp as how it kept up with our other buddies 600hp RS6.
anyway, a week later, it went flat. another dead hole!! so, we are rebuilding the original and then this one too to sell. its not valves (although I think it is) as he did a leak down. its also the same Silcon aluminum block as we have. they think its broken rings or something. if so, im thinking that that would or could take out the surface of the cylinder walls. we will see. anyway, its closed deck but the cylinders do join at the sides, which is a weakness. But many of these last a good long time and perform well. on the track? havent seen too many of them.
doing liners and etc, would be a waste and unproven, similar to what we have with the 928. probably impossible, as you have ONLY a 4mm wall thickness for BOTH cylinders at their joining point.
picture ours vs M3 or M5 V8

mk

mark kibort

I think the real solution is to get the M5 intake and just bolt it onto our heads! It looks like it would work with some kind of adapter for the wider ports on the 928 heads. (its about 1" longer overall)