Capt Nemo o2

I got bored so I was looking around on the UK MSN Autos website and compared the C230, 200, and 180. They are all supercharged and the bore and stroke are the same (according to the site) but the compression ratios are 8.5:1, 9.3:1, and 10:1 respectively. That leaves me to believe that the main difference besides boost is the size of the combustion chambers in the heads (or possibly longer pistons).

Now here is my question...

If you can get your hands on a 9.3:1 head (or pistons) from a C200 and put them into a C230 and obviously run 100 octane, do you guys think that would work to give you some good gains? How hard would it be to tune the engine for that?

Just a thought for anybody who wants to go crazy!

kompressor85

most likely wouldnt need to run expensive 100 octane fuel all the time if you simply used methanol/water injection. hmmm. 5 gallons methanol yeilds 10 gallons of mix, priced @ $35.... versus always running race gas...... hmmm....

being as how methanol has an octane level of somewhere around 116..... very nice!

EDIT: i wonder what the part numbers of the pistons, rods, crank, and head are.

if the bore and stroke are all the same, i wonder if they changed connecting rods. i'd also like to find out cam lift, for instance if the valves open a shorter distance on the higher compression motors for interference purposes.

thats a lot of information, probably best shown on an excel spreadsheet.

rlee02135

100 octane is pricey....

kompressor85

aggravates the hell out of me there is mor replies to "hey i'm a yoyo and washed my car come look LOL!"

people on this forum need to grow a pair. we have a car with a lot of untapped potential and everyone just wants to put rims on and take a hundred pictures.

i think if i farted, and dutch oven'd anna kournikova, it'd be more interesting than some of the retard posts i see on here.

Capt Nemo o2

I know, I feel the same way! People complain about not having any mods or horsepower, but yet when an idea is given, people run scared! If I personally had the resources, I would consider giving this a try if I could hook up with the right people to help tune the car. But alas, I am a broke college student!

LOL! I think I would pay to see that!

Outland

Finally, a thread that isn't about painting your grille, or some stupid bolt on brabus or fake AMG ****.

Combustion chambers are usually part of the casting, meaning the cost to have separate castings just for slightly differing engine outputs would probably be prohibitive. Special pistons is most likely the reason. They all might be the same height, just the dish is different on top. Interesting that the C180 has the highest compression, it must have very low boost.

Given how quickly the computer dials back the advance right now, I wonder if you'd actually get any more power or would the computer sniff out a little pre-ignition, and you'd get no where. No more limping along on 87 octane for the cheapies in this group.

kompressor85

how many times must i repeat myself?! methanol injection is cheap and inexpensive to maintain! :-P

EDIT: did i mention methanol's octane level of 116?

Capt Nemo o2

I was looking at Kleemann's site... I would assume the power you could expect from this would be the same as there C200K kit (10:1 ratio with 11psi might run into problems)

200 1.8 Kompressor (M271)
HP/Nm(lb-ft)
stock - 163/240 (178)
kit - 210/300 (222)

Stock C230
192/260 (192) (Euro #'s)

~20hp and ~30 lb-ft, that seems pretty good! I havent seen many mods for the M271 that gave that kind of increase. And it would all be straight from MB.

splinter

I’m running 9:1 (nominal) and 15 PSI.

The DME already retards ignition timing ~20 degrees from its ideal baseline setting. When balancing the compression ratio/boost equation, at some point one (perhaps that which has been established by M-B) experiences diminishing, or nonexistent, returns.