MB 124 M104 + Big turbo - PeachParts Mercedes-Benz Forum

kynsi · #1 02-20-2010, 11:38 AM

It is lots of snow and -37 Celsius here in finland, but summer is coming soon. Then we drive Mercedes, and maybe go street car drag racing in airport.

Inside the hood:

-Old M104ce24v engine.
-Pistons machined -1mm from center. (5mm left as it was in sides.) Old pistonrings just re-honed cylinders.
- OM606 rod bearings
- 4plate special cluthplate (dont know what its called)
- megasguirt, HEI,+630cc injectors.
- Garrett GT47 74,5/88 + intercooler

No other changes!

http://www.youtube.com/watch?v=n5XNPyjRpGw&feature=channel

http://www.youtube.com/watch?v=yFx_U_Vgorg

Pistons was too weak to handle 1.3bar over 500hp 98E and compression of 10:1.

New engine coming soon:

-M104.94 2.8 Block

-90mm Turbo pistons

- H-Beam Rods

-Nava linea gasket 2mm

-M104.94 2.8 head, light porting job, inlet cam replaced by another Exhaust cam whith solid sprocket.

Piston machining edited.

e320_Coupe · #2 02-21-2010, 05:08 PM

Quote:

Originally Posted by kynsi

Pistons machined -2mm from center.
...Pistons was too weak to handle 1.3bar over 500hp

2mm sounds like a lot from the pistons, maybe a bit too much?
I machined 0.5 mm from the centre of mine and made them flat topped.

Don't forget to post pictures of the new engine build

kynsi · #3 02-22-2010, 02:23 PM

Quote:

Originally Posted by e320_Coupe

2mm sounds like a lot from the pistons, maybe a bit too much?
I machined 0.5 mm from the centre of mine and made them flat topped.

Don't forget to post pictures of the new engine build

I have same pistons in my garage. Looks stong, but the piston ring area looks similar to those broken ones from .980. Few BMW guys have broken many Noral pistons in same area (one Mahles) and one diesel audi tuner too (also noral and new pistons).

I measured pistons and yes you are right. 1mm was taken. Excuse evryone. I hope nobody machined their pistons yet....

Im going to try saab turbo pistons bore 90mm (500-650hp from 4cyl whith 98E in finland).
Ifound pistons from here:

http://www.speedparts.se/

kynsi · #4 02-22-2010, 03:25 PM

Picture from 2.8 cylinder head (still work to do):

Last summer:
Evolution 1 (twin)

Evolution 2

MAG58 · #5 02-22-2010, 07:48 PM

Just so we're clear, that Turbo is silly large.

What kind of spool did you get with it?

c280nz · #6 02-23-2010, 02:50 AM

omg that is rediculus big, how high are you reving the engine?
why did you change away from the twin turbo? were you running out of boost at higher revs?

JayRash · #7 02-23-2010, 03:36 AM

i find it strange that the twin setup couldn't hold boost, maybe the spool was really bad, even worst than the large "LARGE" single setup.

My twin KKK K-16s could easily hold boost steady at over 15 psi all the way to 7K rpm.
only tried it once since i knew engine didt stand a chance if drove it all the time.

Turbo E320 · #8 02-23-2010, 08:19 AM

I think they just want to make a lot of HP with as little boost as possible so they are using big turbos. Their old twin setup looks like two Borg Warner S200 series turbo's which are high boost turbo's if anything.

Joreto · #9 02-23-2010, 09:33 AM

Very interesting that in your setup the stock pistons gave up first, in my turbo 2.5-16v the con rods turned out to be the weak link (rod broke pistons were fine) . Do you plan to change the rods with aftermarket ones ?

kynsi · #10 02-23-2010, 01:13 PM

Twin setup made max 360whp (log wiewer) and engine felt like it had exthaust pressure. Same fuelmap and rpm gave 521fwhp whith big turbo. So there was too small holes in hot side. I also broke little turbo 2 times by ovespinning them. Twin turbos was easy to drive, big is a bit laggy if driver dosent know what to do. Yes im loking for new rods. I dont want to crack old ones in two halves, like diesel tuners here have done.

Turbo E320 · #11 02-23-2010, 01:25 PM

Once you get your turbo setup dialed in you should add a 75 wet shot of nitrous to get rid of all that turbo lag. As long as you put a boost switch on it to cut it off at 2/3's your maximum boost you will avoid damaging the engine won't have to change the tune.

kynsi · #12 02-24-2010, 10:56 AM

Engine block is ready next week. Piston set didnt include pins

, so i have to look for those too

...

The bottom end is going to be 2.8 block and 3.0 cranck.

kynsi · #13 02-25-2010, 04:38 AM

Quote:

Originally Posted by Turbo E320

Once you get your turbo setup dialed in you should add a 75 wet shot of nitrous to get rid of all that turbo lag. As long as you put a boost switch on it to cut it off at 2/3's your maximum boost you will avoid damaging the engine won't have to change the tune.

There is big lag if driver drives too gentle. If you know how to drive you can go fast. Cylinder head have to flow about 250-300hp at least to wake that turbo up. New head flows 335hp at normal lift. Supra boys have done lots of fast big turbo engines. Pumpish has big turbo in hes 103 (i understood he has still original camshaft

) and it wakes up.