natural asprirated - Page 3 - PeachParts Mercedes-Benz Forum

oldsinner111 · #31 10-10-2011, 09:53 AM

Nice cams high price,what horsepower extra with cams Sir.

MAG58 · #32 10-10-2011, 10:32 AM

Yeah I cant justify that kind of dime for those cams. For that price i can run a full set of hardfaced and ground cams in whatever lift/duration/LCA/etc. that I want and still have enough left over for a set of solid lifters. I have a feeling these would really free up the motor, but not on the order of 1200 euros +shipping+customs etc. That's going to end up being 2 grand once you get the cams in for a 104, a grand for a 103. That's billet territory right there, and then some.

teezer · #33 10-10-2011, 11:34 AM

Quote:

Originally Posted by MAG58

Yeah I cant justify that kind of dime for those cams. For that price i can run a full set of hardfaced and ground cams in whatever lift/duration/LCA/etc. that I want and still have enough left over for a set of solid lifters. I have a feeling these would really free up the motor, but not on the order of 1200 euros +shipping+customs etc. That's going to end up being 2 grand once you get the cams in for a 104, a grand for a 103. That's billet territory right there, and then some.

any links to articles or posts on aftermarket cams in 103s or 104s ??

i think a $1000 is pretty reasonable, in the mercedes performance world, for a kick in the pants upgrade on a m103

be interesting to see the power/torque ranges on those cams, would be nice to see one that would start in the 2000-2500 rpm range instead of the stock 3500rpm range. add a free flowing exhaust and a 3.64 rear gear and that should make it a little jack-rabbit around town

MAG58 · #34 10-10-2011, 01:44 PM

You have to remember that static compression ratio on these engines isn't exactly that high, especially on the 103. It doesn't lend it self to a big cam with overlap. If you want to drop the rpm of the power band, just advance the cam a few degrees. The smaller cams can probably be reground in the states for 1/4 of the cost of getting a dbilas cam here. The larger ones will probably just reduce drivability more than the gain you think you'll be getting given the engine's SCR. If you want to lower the powerband, a bigger cam isn't what you're looking for.

But what do I know. Spend the grand, get a giant cam, toss in there. If nothing else, I wanna hear that thing Idle. Should sound wicked.

oldsinner111 · #35 10-10-2011, 02:12 PM

well to get a m104 tuned for 13 hp is $500 .If the cams can do 50 hp it bee worth it.

JayRash · #36 10-10-2011, 05:24 PM

Quote:

Originally Posted by Joreto

Nice document, just what I needed (Eric, thanks for the link). Looking at the graph on page 204, it looks like the 3.0 m104 benefits to have the cam advanced (on) to about 5000 - 5100 rpm, currently I switch it off at 4700 rpm .

I always said that cam advance on the m104 is switched off too early it should stay on till just above 5000. but who knows y merc has it at 4700, maybe on part throt its better! i cant tell.

JayRash · #37 10-10-2011, 05:26 PM

no cam can give u 50 hp not even on a blown engine

400Eric · #38 10-11-2011, 07:18 AM

Quote:

Originally Posted by RBYCC

Eric

I tried various online translation services and it appears that the pdf document is too large to translate.
Maybe print the pdf, scan each page and try translation of one to two pages at a time?

Ed

Thanks for trying Ed.

I don't have a scanner so your second idea isn't an option for me. I'll bet there is somebody here who can do it though for the good of the hobby!
Regards, Eric

oldsinner111 · #39 10-11-2011, 08:13 AM

Thats what I thought the cams are worthless

RBYCC · #40 10-11-2011, 09:00 AM

Quote:

Originally Posted by JayRash

no cam can give u 50 hp not even on a blown engine

Jay

So correct with cam alone...consider the AMG M103-12V 3.2L...
AMG increased displacement, compression ratio, cam, head work, performance exhaust and gained about 70HP over stock M103-12V 3.0L..

Ed A.

teezer · #41 10-11-2011, 09:39 AM

Quote:

Originally Posted by RBYCC

Jay

So correct with cam alone...consider the AMG M103-12V 3.2L...
AMG increased displacement, compression ratio, cam, head work, performance exhaust and gained about 70HP over stock M103-12V 3.0L..

Ed A.

take the amg cam out of the mods they did and i bet you'd be lucky to get a 20hp gain

RBYCC · #42 10-11-2011, 10:10 AM

Quote:

Originally Posted by teezer

take the amg cam out of the mods they did and i bet you'd be lucky to get a 20hp gain

I tend to disagree...

The increase in displacement alone accounted for 19HP and 30lb-ft of torque.

This is comparing the AMG 3.0 with the AMG 3.2 both M103-12V with the same cam, compression, heads, exhaust, etc......

Ed A.

400Eric · #43 10-12-2011, 02:24 AM

What were the actual numbers for the 3.0 M103 AMG? Do you have a link to this info? I'd like to have a peak at the tech info on that engine if there is any.
Regards, Eric

RBYCC · #44 10-12-2011, 08:05 AM

Quote:

Originally Posted by 400Eric

What were the actual numbers for the 3.0 M103 AMG? Do you have a link to this info? I'd like to have a peak at the tech info on that engine if there is any.
Regards, Eric

Eric

Everything I have from the 1987 AMG Technical manual:
Notice under the tuning parts kit AMG supplied a "pump relay"... fuel pump relay with higher rpm cutout to take advantage of the cam ability to make power at a higher RPM?

nick.ged · #45 10-12-2011, 05:29 PM

the rev limiter of the last of the 103 12v 3.2 equipped cars (wich made 245bhp) was set at 6500, however, it made its max power at 5750, wich is only only 50 rpm higher than the std 103 that the engine was derived from.