From my extensive use of the search button... I have concluded this.

3.2L NA Crossfire Engine
89.9mm bore x 84mm stroke
90deg V
10:1 CR

3.2L SRT-6 Crossfire Engine
Completely different engine....
89.9mm bore x 84mm stroke
9:1 CR w/ Forged Internals

I'm doing my research on a Crossfire to build a 3.2L Twin Turbo setup. This will undoubtably require New rods/pistons/and sleeving the cylinders... and possible a different six speed transmission. I simply need more information as to HOW these engines are different. Do they both have the MMC cylinder walls? Are these closed deck blocks? Open Deck? Semi-Closed deck? How much power can the NA 3.2 Hold in factory form? How much can the SRT-6 hold in factory form?

From the technical drawing I saw on a benz specific web site it looks to have similar valve actuation as a sohc neon (Rocker arm w/ hydraulic lash adjuster)

Do both the NA and SRT-6(sorry for the typo) engine have the 3 valves per cylinder? Both sodium filled exhaust valves?

Is there anyone who has "built" one of these engines yet?

Thank you for your time and Patience...

Eric Urness
R/TErnie Race Engineering
541 980 6022

 

I tell you what, send me your email and I'll send you all the pdf files I have on this engine.

if your willing to tear the motor down and do machine work, you can probably get the displacement over 3.7L and if you sleeve it probably go much larger. the cylinder walls are very thick and are aluminum with a carbide low friction coating or something of the sort. I would preffer cast sleeves myself.

LA Sleeve can do any custom sleeve you require..

as for the cylinder decks, I seen a photo of one of our forum members, she had the dealership install a new engine and the dealer took photos of the problematic original bare block torn down, it was really thick open deck. but yeah I guess you could make a support piece for the walls and weld it in there

 

All I Know Is The Srt4 And The 2.0 Neons Have 4 Valves Per Cylinder......

 

sowardcustoms,
I'm sorry... I meant SRT-6. I'm a turbo neon guy so I naturally type SRT-4 every time lol.

Maxwell,
my email is eric@rternie.com I'd love to have the PDF's. I've done work with Darton on 2.6L Suby engines... so its definitely possible I've spoken with LA sleeve about doing some sleeves for a parallel twin 600cc engine for our FSAE car.

The sleeve would be machined to make the cylinder semi-closed (basically a large step that is machined into the block.)

I've just read about the "3.7L" sleeve piston replacement from the ML320...however everywhere I look about the ML320 it has the same Bore and stroke as the 3.2L engine in the crossfire. So...there would be NO gain in displacement by using those sleeves. Am I missing something? Update... Found this on MB world

http://www.mbworld.org/forums/showth...=222631&page=3

From above,
so if Im reading his poor english correctly.... the Sleeves from an E55 are used in conjunction with the stock pistons to sleeve it to a 97mm bore (~7mm bigger than stock...talk about unshrouding the valves!) I would imagine these stock sleeves and pistons would be EXTREMELY expensive coming from MB.

A set of Cast Iron sleeves from Darton/LA and some CP pistons/Crower rods would be much less expensive...yet still expensive.

 

I Know I Was Just Kidding.....

 

There is a thread on the mbworld forums about a TT project:

http://mbworld.org/forums/showthread.php?t=222631

Keep us updated on progress. Subscribed.

 

most performance upgrades for the m113 should work on the m112

 

I spoke to Erick @ LET and he informed me that the SRT-6 Engine (M112?) is actually very similar to the NA Crossfire engine (M113?) except for the pistons...which led us into several other topics.

I'm still reading... tons of threads to go through. I've been reading MBworld as well. Got an Insurance quote on an NA Crossfire and found a local 05 Black coupe w/18k miles for 13k(homie hookup) Just trying to figure out how much the bottom end is going to cost first

 

m113 == the v8 version, correct?

Erick and Jerry at LET are very knowledgable about the m112, specifically the Supercharged form. Both the NA and Supercharged motors are m112s. I believe in the past on the mbworld forums, they would be distinguished by m112 and m112k. Where the K stands for kompressor/supercharged version. I believe this also applies to the m113 and m113k.

 

I think the rotating assemblies are completly different between the srt6 and NA crossfire. thus why are there two different crankshaft part numbers for the m112. would be awsome if somebody could blueprint the cranks and rods.
the srt6 rods might also be stronger and ofcourse piston is different.

but both rotating assemblies are forged parts

oh yeah check out project chromedome over at mbworld, some guy went nuts and disassembled the manifold for porting polish, and some homebrewed velocity stacks, he says it pulls nicely with these mods. not bad for 25 hp https://www.crossfireforum.org/forum...782#post227782