Subscribed!!! I look forward to reading about your results.

Who is doing the head porting if you don't mind?

For what it is worth, don't worry about boost lost from head porting. Although it sounds like a negative on the surface, it is actually a positive! I would also recommend staying with the 180mm pulley.
Good luck with your project!

 

FLOW CHARTS:


INTAKE CHART
ORANGE = @ 28"
BLUE = @ 10"


EXHAUST CHART
GOLD = @ 28"
PURPLE = @ 10"


COMBINED CHARTS

 

Beauphus you make me want to rip my heads off right now and get to work. haha! Anyone know where I can get a set of take-offs? That way my car would only be down the time it takes the swap the heads.

 

ur tellin me. i havent driven my car since mid december. talk about an extreme makeover to the stocker i am used to. now they are saying i will be ready for tuning next thursday or friday. patiently waiting...

as far as heads it took him approx a week and a half to complete the job

 

Nice gains You mind me asking who did the work and how much it cost? I must have missed it in the thread. He opened up the intake side alot but looks like the exhaust side is pretty good from the factory. No oversize valves or anything right? Just port and polish

 

no valve changes. just port n polish. PM'ed u

 

Maybe I'm reading the chart wrong. To me, we are looking at the flow rate at two different pressure levels, not before and after results which are typically posted.
Assuming these are the porting results, do you have a graph of the stock ports?
Thanks again for your contribution.

 

unfortunately he didnt measure before the job. here is 2 other places i found that reference the stock numbers but i have no way of proving them correct and i imagine they vary from car to car albeit slightly

"Stock heads flow around 250cfm @ .450lift on the intake side and 153cfm @ .400lift on the exhaust side."



This chart was done by the same guy who did my PnP job...

 

due to the extra flow how much more hp/tq is predicted?

 

Not really sure and it isnt an isolated mod so dynos will be inconclusive about this one mod. Mixed with the cams it should be a nice increase. The guy who did the head says generally speaking it nets a 5% to 10% increase of hp. 50 hp increase over stock seems hard to believe. Other problem is people who have had this done before dont post results for reasons unkown. I however will gladly post results hopefully by next Friday. stay tuned...

 

typically it's been because the gains have not come close to what was advertised. i'm not trying to be a downer but it certainly is unfortunate that we still won't have any real data on head porting after this build.

 

That's what I'm afraid of. Hopefully the head work ontop of the other mods have made it worthwile.

 

update

https://mbworld.org/forums/cls55-amg...ics-video.html

 

Yeah, I hate to be a show stopper as well, but SEVERAL people here have had less than lack luster results with porting/polishing/valve changes. To the OP GOOD LUCK and best wishes.

It really is a shame we will never see the before and after flow charts

 

updated videos for those curious

http://www.youtube.com/watch?v=jqRqGux8kII

http://www.youtube.com/watch?v=dgEggcrLz9U

 

what did it make on the dyno?