e1000

To clarify, Karo is talking about Phil, I have never cheated on anyone.

samaritrey

so glad that matt and I are on the east coast we are safe

mskembo

When it comes to Karo's appetites, nobody is safe! Remember the first rule guard your starfish!

W203E35

Where is Phil anyway? I don't see him on the boards. I miss that guy (not in a Karo way) . We should all hang out again. I haven't seen Ed for a long time eighter. I wonder how the SeaCoupe is doing.

Why do you guys think I keep insisting for the both of you to come to Los Angeles . I know Matt will want the Armenian Shish Kabob but I don't know about you Trey

e1000

We're all pretty busy these days. I've been traveling a lot.

cpbeasley

paid to use startekinfo tonight. other than the programs recognizing the different engine model number of 272.960 for the c350 and 272.963 for the slk350 (used a vin# for ea), the PNs for camshafts, valves, and intake manifold (supposedly the big 3 differences) were all exactly the same. Pretty disappointed.

W203E35

Interesting.....I know the pistons are different (different part number between SL350 vs SLK350 VS (C350/CLK350). Surprised the valvetrain is not.

This was achieved by raising the rev-limit to 7200 rpm, increasing the compression ratio and other modifications to the valvetrain.

cpbeasley

I'll have to look up the pistons tonight just for giggles. still have til the end of the day on there.

"other modifications to the valvetrain" unless they only changed valve or spring retainers to hardened ones, NOTHING was different via EPC. When I looked at repair docs for the intake on the slk350, the intake manifold's runners looked a little taller, but i wouldnt really know any better.

this baffles me. would the diff valvetrain PNs be hiding somewhere? this was supposed to solve the mystery for me.

maybe the pistons were modified to change the compression ratio? if this is the only discernible PN# difference to note via star/epc, then thats perhaps it? i dont THINK the heads can be machined down... and surely they wouldnt have made a completely new cyl head? guess ill compare that PN too.

I really was hoping to find out if the valvesprings most importantly, or if any other component of the valvetrain was different to accomodate the 7200 rev limit. I was hoping to tell the boys at OE to bring mine up a few to give me a little more play in my shifts. i dont want a broken spring, bent valve or worse.

cpbeasley

picking on the right side... slk350 cyl head shows same PN however only in the slk was the PN replaced twice to in the end match up with A 272 010 35 20. so according to EPC the heads are the same. moving on...
looking up pistons.
slk shows a2720306617
c350 shows *2217 and *4317 however there's a note to designate cylinder bore and some piston ID.
wife's c230 shows two others finally replaced by *4017

so, need to find out thhe differences between 2217, 4317, and 6617.
edit: modified some filters and found *9717 also. fml. wish i knew how to work this thing better.

camshaft between c230 and c350/slk350 are different...

cpbeasley

Breaking the 300-hp Barrier
If there's a theme to the new SLK, it's the adoption of a more aggressive personality, and this is reflected in the significant changes made to the SLK350's 24-valve DOHC 3.5-liter V6. A taller 11.7:1 compression ratio is accompanied by more deeply shrouded valves in the combustion chamber and new camshaft timing.

There have also been some big changes to the induction system, with the adoption of a single-stage inlet manifold that feeds air into the engine via a plastic intake tract, a feature that reduces heat buildup and thus lowers the engine's operating temperature.

The result is a 33-hp jump, and the SL350 now packs a muscular 305 hp at 6,500 rpm. At the same time, torque is up by 7 pound-feet to 265 lb-ft at 4,900 rpm.

As impressive as the numbers might seem, the personality change in the engine is what really makes all the changes under the hood worthwhile. There's now a whole new level of throttle response, while a stronger rush of power at the top end extends the redline to 7,200 rpm from 6,800 rpm. As a result, the 2008 Mercedes-Benz SLK350 feels a good deal more determined than ever before.

ref: http://www.insideline.com/mercedes-b...nz-slk350.html

Then wwhhyyy arent the part numbers different for valves and intake manifold?

cpbeasley

And by "more deeply shrouded valves", I suppose they are indirectly referring to larger diameter valves? How else could they be more deeply shrouded against the combustion chamber wall,....*edit
certainly not a smaller combustion chamber.

W203E35

With tune and cams you should easily reach 305hp if not more.

cpbeasley

not really the point tho Karo. Im just curious as to exactly what they did. i wanna know what size valve, if the pistons are domed, etc. Moreover, if they did use larger valves and a more effecient intake manifold - just items i can add to my wishlist to do that much better.

W203E35

Well what I'm trying to say is all those mods are not gonna be worth the headache and money. You're gonna have to change pistons, valves, valve seats and raise the rev-limiter (easiest part) from what I read. If you can get the same if not more power with just adding cams (since you already have your tune why not take the cheaper route). Unless you wanna do the SLK mods and tune it with more aggressive cams?

At that point I rather just add a little forced induction on the lower compression m272 than the higher compression (1.0:1 more). Makes more sense, if your gonna mess with pistons drop the compression a little and boost the ****.

Stock internals and stock everything a w204 350 was boosting 7psi. 350whp and 370wtq. I don't know how much it cost the guy but I'm sure you can get away with it for max 8k. But then I don't know if the manual can handle that much power. The autos can handle more power than the manual.

Edit:

I drove Milkman's C230 6MT yesterday and man is that one fun car. Straight pipe sounds awesome on that car. I tried to do a little rev match when downshifting but it looked like I was intimidating the 350Z next to me lool

cpbeasley

No way am I tearing the motor apart to put new pistons in! That's why i said wishlist. ie - salvaged parts come for sale at some point, decent price, id pick up the manifold or even a set of the valves. removing heads arent a big deal.
ill
By FAR Im just simply curious! The tech specs are still a mystery and that just bugs the crapp outta me!

cpbeasley

and I kinda get tired of saying this, but its really just all for fun. I love tearing motors apart and putting them back together. not looking to create a monster.

LILBENZ230

Tearing the engine apart? The M272? <clarkson voice> for FUN? </voice>

cpbeasley

Karo -
I missed something you said. Yes, SLK mods + more aggressive cams, exactly. Sorry about that! I want nothing to do with the SLKs cams. If the pistons were the only missing link to the 11.7 CR, I would consider them as an option later down the road. That said, Iam staying strictly N/A with my 'Frankenstein' baby. I'll reconsider the day I turn it into a funny car

Matt-
What can I say? I like tight places ;-p

LILBENZ230

OneOfaKindTrini

Put it like this, the cams in the different models can have different profiles to throw the power around the rev band. Like Karo's car, it pulls like a **** after like 3-4k RPM.

nlpamg

What up, buddy!

I'm around. Lurking on a few boards, but pretty busy...

We were supposed to have a mini-meet at my place last weekend, but E and MJ are both travelling. Maybe this weekend.

cpbeasley

Yes they can, I'd just like to know the specs: lift/duration, out of sincere curiosity.
I'd also like the valve specs due to the fact they're more shrouded, so they must be larger.
And what raises the CR from 10.7 to 11.7.

I wont be at rest until I find out. I miss my LSX forums. Spec junkies galore.

cpbeasley

UPDATE:
Upon isolating the intake manifold part number, I found that the throttle body is also different. Suprisingly, it's the 82mm throttle body found on some of the 550 series engines. So, it's not just the intake manifold responsible for the upper RPM breathing. The intake manifold is cheap, but the TB is very expensive. The gasket b/w the two doesn't even exist. Waiting on a call to see if it's bc the part has never been sold in the U.S. before or what the hiccup is.

cpbeasley

gasket does exist. it's just only been ordered one time in the U.S. gasket kit comes with purchase of intake manifold.

so anyway. as i already said. not just intake manifold, but a damn AMG TB.

W203E35

This is great info Jerkface. Ohh **** you needed the PDF. I'll get it to you now. Sorry totally forgot about it pickle dick.