107 Stroker Engine 500Euro to 5.6 Euro - PeachParts Mercedes-Benz Forum

duxthe1 · #1 04-08-2008, 07:56 PM

I'm posting pics of my co-workers SL. It is an 81 380SL that up until recently had a 500 Euro motor in it. As a couple of MB techs we've done a lot of bench racing over the years and he finally decided to have some real fun. It started with a 560 Sec that had a cracked block that came in the shop. The SEC got a shortblock, no big deal, and no core. So I convincve Mike to pull the crank, rods and pistons from the 560 before scrapping the block. Due to excessive oil consumption mike pulled his heads off his 500 Euro about the same time. It appeared that a couple of cylinders were passing oil past the rings and not the guides so out came the engine with the hope that the 560 reciprocating parts would interchange into his 500 block. Well this wouldn't be much of a post if it didn't. The long stroke crank fits right in using the 560 rods and pistons, giving the same deck height as the other block. He kept the smaller valve 500 heads intending to make a torque monster and not so much a 6k+ RPM screamer. Mike's not a tech geek so there are no pictures of the build. Sorry guys. He drove it into work today for the first time and I got to take it around the block. I can sum it up in 3 words.... gobs of torque. It's available right off idle too. If that wasn't enough for a big grin, at around 3k rpm, it gets a really mean snarl and pulls like mad to the upshift, after which I didn't have enough road ahead to hold it. Now the only thing planned is an exhaust upgrade. The big inch stroker really wants to breathe. Needless to say it's still faster than any 107s we work on in the shop by a good margin even with the restrictive pipes on it.

Johnhef · #2 04-08-2008, 08:34 PM

Ortolan · #3 04-08-2008, 10:35 PM

Nice!
Q: If the stroke has increased but the deck height and piston crown remains the same, doesn't that mean the compression ratio will have increased?

Ara T. · #4 04-09-2008, 01:15 AM

Sounds like a blast. WHat are those 3 bird turd looking things near the front fenders?

t walgamuth · #5 04-09-2008, 06:57 AM

Quote:

Originally Posted by Ortolan

Nice!
Q: If the stroke has increased but the deck height and piston crown remains the same, doesn't that mean the compression ratio will have increased?

Yes.

If all that you say is true.

Tom W

duxthe1 · #6 04-09-2008, 10:04 AM

Yes the deck height is the same, although the 560 pistons have a larger dish so the compression is unknown in this combo. I'd guess it is more but how much I cant say. With the ignition pickup in the dist. he just set it up to run without pinging and it is really happy there

FLYNAVY · #7 04-09-2008, 03:10 PM

Tell him to please take off those disgusting fender gills.....aren't those from like a Mercury or something. Some of these fads boggle the mind. Other than that, sounds like a fun car!

MTUpower · #8 04-26-2008, 09:29 PM

No fan shroud? Euro exhaust manifolds come buy from time to time- but they are chassis specific. I've sold some from both a 107 and a w126.

iwrock · #9 04-27-2008, 12:13 AM

Damn, thats one nice car....

I bet that thing flies.

Roncallo · #10 04-29-2008, 09:13 PM

Quote:

Originally Posted by duxthe1

I'm posting pics of my co-workers SL. It is an 81 380SL that up until recently had a 500 Euro motor in it. As a couple of MB techs we've done a lot of bench racing over the years and he finally decided to have some real fun. It started with a 560 Sec that had a cracked block that came in the shop. The SEC got a shortblock, no big deal, and no core. So I convincve Mike to pull the crank, rods and pistons from the 560 before scrapping the block. Due to excessive oil consumption mike pulled his heads off his 500 Euro about the same time. It appeared that a couple of cylinders were passing oil past the rings and not the guides so out came the engine with the hope that the 560 reciprocating parts would interchange into his 500 block. Well this wouldn't be much of a post if it didn't. The long stroke crank fits right in using the 560 rods and pistons, giving the same deck height as the other block. He kept the smaller valve 500 heads intending to make a torque monster and not so much a 6k+ RPM screamer. Mike's not a tech geek so there are no pictures of the build. Sorry guys. He drove it into work today for the first time and I got to take it around the block. I can sum it up in 3 words.... gobs of torque. It's available right off idle too. If that wasn't enough for a big grin, at around 3k rpm, it gets a really mean snarl and pulls like mad to the upshift, after which I didn't have enough road ahead to hold it. Now the only thing planned is an exhaust upgrade. The big inch stroker really wants to breathe. Needless to say it's still faster than any 107s we work on in the shop by a good margin even with the restrictive pipes on it.

Nice conversion. Does the 500 really have smaller valves. That would surpise me. I read the 500 Euro had around 240HP as compared to the 560SL version at 227HP. I had assumed the heads were the same.

Faster than any 107. I think it would be a close race but for a US spec 560SL verses Euro Spec 500SL my money would be on the US 560SL for 0-60 or in the 1/4 mile. For absolute top speed I would go with the Euro 500SL.

John Roncallo

duxthe1 · #11 05-04-2008, 10:30 AM

It is generally agreed around our shop that Mike's SL is faster than any we work on. Remember this is a Euro spec 500 engine with the 560's displacement, best of both worlds so to speak.

Roncallo · #12 05-04-2008, 07:00 PM

Quote:

Originally Posted by duxthe1

It is generally agreed around our shop that Mike's SL is faster than any we work on. Remember this is a Euro spec 500 engine with the 560's displacement, best of both worlds so to speak.

This is true. There was a Euro spec 560 SEL with 300 HP. Your friend should be running somewhere around 260HP.