stock pistons, rods,getrag,clutch and diff power limits (16v) ? - PeachParts Mercedes-Benz Forum

Joreto · #1 12-28-2005, 04:14 AM

I've posted a simular question in the 190revolution forum but didn't get an anwser (maybe no one knows), so here is the question again :

What is the power limit that the stock internals of the 190e 2.3/2.5 - 16v can handle ? All the turbo 190e 2.3/2.5 - 16v I've seen run around 1bar (14.5 psi) is this the limit ? I've decompressed mine to 8.0:1 CR (by modifing the con rods) and I wonder if it'll be safe to run ~ 1.4 - 1.5 bar (20 - 22 psi) , also what is the max torque that the diff and clutch can handle ?

P.S. I've read that a lot of bimmers use forged internals (con rods, crankshaft), anyone know if the 190e 2.3/2.5 - 16v have forged crack and rods, I get different answers from different people on the subject.

mbdoc · #2 12-28-2005, 07:56 AM

Only the pistons are forged on the 16V engines! Rods & crank are cast!

The reason MB went to the evo 16V motor was the "BOTTOM" end. FOR racing the stock bottom end couldn't take the power!

Joreto · #3 12-28-2005, 04:15 PM

M.B.DOC, thanks for the reply, this means that the stock pistons can handle quite a bit of power (also explains why they cost 2x the price of the normal 190E pistons). Just a though, can the rods be replaced by rods from a different MB model,maybe from the kompressor ones (C200 or C230, they should be with forged internals) ? Any insite to the max boost (safe) I should run with 8.0:1 CR and standalone EFI (Megasquirt and EDIS) ?

duxthe1 · #4 12-28-2005, 11:17 PM

I wouldn't be too worried about breaking the bottom end so much. I'd worry more about egt and let that (and detonation

) be the determining factor for the boost limit. I had a Saab 2.0L lowered to 8.6 to 1 comp. with 22 psi on it.

and did it with milled O/E pistons to boot

Joreto · #5 12-29-2005, 01:44 AM

duxthe1, yep detonations is a nasty thing, thats why I switched to EFI and also got the zeitronix wideband kit with EGT sensor. While on this topic what is the EGT I should aim for ?

duxthe1 · #6 12-31-2005, 08:10 PM

Not to be crude, but that is more of a personal decision.

If I recall right it's around 1400F-1600F that the exhaust turbine starts to become "iffy" So if you set that as the "things break point" then you have to determine how close to that you're willing to run. Since it's your risk in reality it's your call but I will tell you to err on the side of caution.

Joreto · #7 01-03-2006, 01:57 AM

duxthe1, thanks . I prefer to to err on the safe side since this is my daily driven car and it has to be reliable