[PatrickSWE]

I had problems with exhaustvalues at lates MOT.
so i figured this winter i´ll blueprint the head.

no pictures just yet, but first impressions..

Head is ported out in exhaustchannels, made by an cncmahine probably
Valves has 'DLC' coating on inletvalves.
'Beehive' valvesprings to reduce weight.
I will take some pics as the journey goes by, it will take some time thou.
I´ll even try to sharp up the work AMG have done. due to it´s not that 'final touch' been made.
Serialproduced you know.
And i found a couple of spots to improve upon

 

[PatrickSWE]

second impression,, sometimes the rubberhose between the throttle and the crossoverpipe shrink.
Make sure your´s is in correct diameter.

 

[PatrickSWE]

Blue printing in progress:

coated inletvalves with backcut grinded std, hard to see thou. RACE stuff from factory.. me like!!

Ugly kinks on flowpath...

AMG has cncported to this point, ignore the fact that it looks grinded, it´s me who has cleaned from carbon:

little bit of modifying in progress, rounded the exhaustvalves a bit(less heat soakup and more flow:

why the head came off,, really bad shape of surface areas(exhaust):

 

[PatrickSWE]

Opened up the area under the valves a little bit:

Left the rough surface on purpose, better atomizing of fuel and the area at the flange to the inletmaifold is a little bit soothened out, was ugly kinks there:

Nice unshrouding around the inlets:

Exhaust, much smoother, won´t slow down the gasses:

all in all,, these small mods gained me a healty 17cfm 28" on inlet.
It also gained me airspeed.

Haven´t taken the pics of the valves yet. but they are grinded with backcut etc etc.

Rgds.

 

[DRBC43AMG]

Nice work and keep it up :thumbsup:
It has been a while since seeing this kind of conversion which was common practice in all engine upgrades several decades ago. Indeed, standard heads where very rough to begin with and had lots of places for improvement. My knowledge was to get the channels as smooth as possible so as not to disrupt flow

 

[PatrickSWE]

Thanks..

Been measuring stuff today.
No need for changing any hardware.
inlet guides 7.00mm spot on everyone of them
exhaust very very little weared, 7.00 with a small tapering up to 7.005mm down in the bowl area.
Well inside of tolerance,, if starting to mess with changing guides for 5 thousands of an millimeter one must be very stupid.

I´m about to grind new seats in head with my miratool.
it might give me some cfm at lower lifts.

 

[RANDY P]

nice work.

WHat is the mileage of the car? Curious.

 

[PatrickSWE]

just about 160000km
The problem might appear in cars that stands for long periods(mine is not run for about 4-5months a year - wintertime)

You can get small small corrosionproblems if engine isn´t started and run warm for a long time. this is often at exhaustvalves surface.
and when this starts it´s like 'pitting',microscopic material is 'bauncing' between surfaces and gets the avalanceeffect.
and it gets worse and worse.

It almost always shows on bad values on emissontest.
High HC is the main that shows it.

Rgds

 

[PatrickSWE]

Let´s say like this...
There were a guy talking softly about modding throttle in our AMG´s..
he claimed it to be 66mm,,, well that´s bull..
it´s 70mm!
and the airmass meter is restricting flow so no use of going bigger than this...

 

[PatrickSWE]

ahhh...
engine is waiting for the head being done

And in the room next to the garage where the benz is waiting..

The head gets it´s seats grinded etc etc..
really nice to have all the tools at home

Also in the same garage...(teaser)
730hp Opel Kadett:

my toy.. converted from 2wd to AWD.
toys in the summertime(dirty benz thou)

 

[PatrickSWE]

Couldn´t resist.
had to get the rods and pistons out for a checkup and measurement.
Impressive standard stuff

Pistons are coated for less friction and is forged as we all know.
but i didn´t know they were 'lightweight' ones..
wristpin is forcefed with oil.
Manufacturer = Mahle

 

[VR6MAN]

Keep up the good work, I'm starting a tear down on my C36 shortly, I'll be keeping an eye on this thread!

 

[PatrickSWE]

VR6man.. cool

Found a new 'problem'
But it´s an restrictor for poweroutput.
The injectors.. they only flow 209cc at 100% dutycycle.
That is about 290hp at the tops.
Std injectornumber is 0280155209

And maybe maybe it´s why all chiptuners has to struggle to reach ~290hp
If upgrading these ones to say 250cc, you got the juice for about 320hp.
And maybe maybe it´s more power hidden in the engine if upgrading the std injectors.

Raising the pressure to 3.5bar will let us have about 295hp

i´m going for 400cc+ and a piggyback system.
This is juice for ~450hp

And when oilpan is down,, i will weld two connectors for oilreturns from.........

 

[VR6MAN]

I'm pretty certain there was a post about the injectors on club202 at one point, I tried to find it a while ago but I can't even log in anymore

 

[jayrash]

VR6man.. cool

Found a new 'problem'
But it´s an restrictor for poweroutput.
The injectors.. they only flow 209cc at 100% dutycycle.
That is about 290hp at the tops.
Std injectornumber is 0280155209

And maybe maybe it´s why all chiptuners has to struggle to reach ~290hp
If upgrading these ones to say 250cc, you got the juice for about 320hp.
And maybe maybe it´s more power hidden in the engine if upgrading the std injectors.

Raising the pressure to 3.5bar will let us have about 295hp

i´m going for 400cc+ and a piggyback system.
This is juice for ~450hp

And when oilpan is down,, i will weld two connectors for oilreturns from.........

Can u find out how much those on the W124 320 M104 can flow? we might be lucky and they turn out to be larger ones. can u also find out how much those on the 5.0 M119 can flow?
i hope we find a set that can flow some 10% more as this would mean no retune is needed.

 

[PatrickSWE]

I need to know the 'Boschnumber' to sort that out.
Rgds

 

[toptoad]

Very impressive.respect and admiration

Respect and admiration for people like you who are keeping these proper cars alive and in tip top condition.

My C36 has a keen and devoted owner, but crucialy without the skill set you have. I will have to stick to regular servicing and replacing worn out stuff.

I say again, respect.

 

[PatrickSWE]

Let´s update a little..

Long time ago, but haven´t orgotten about you =)

Notice!! opened up a little around inletvalves.
Small nice mod that never fails.

New Seals:

Porting under progress:

Nice

Was out testdrove it today.
More krisp, needed less throttle to keep 55mph.
and above 5000rpm engine felt much stronger.
Tested a burnout... before with my 265/30 tires it didn´t want to climb above 4500rpm on 2nd gear.
Now the engine banged on the revlimiter at 7000rpm
testet let it burn on third gear.. but that was toooo much

 

[PatrickSWE]

And my dear friends... Engine is almost quite... the wellknown AMG sound is almost gone.
I have raised the oilpressure a bit to let the tensioner on the camchain push harder.

It also keeps the hydraulic lifters a bit more 'stiff'

 

[jayrash]

how did u up the oil pressure

can u list the mods u have done sofar internal and external. pls