OutlawAMG

Hey guys,

I am looking for a place that I could find the full specs on this engine and have had 0 luck. Not even AMG lists the full specs

Someone here has to know.

Thanks

jangy

Get more specific and this crowd can help....

OutlawAMG

Most powerful version of the blown 5.4L made. Bore, stroke, cam profile, boost, valve diameter, compression, type of pistons, crank (internal or external balance) etc etc.

prodigymb

compression 9.0:1 , Bore X Stroke in. 3.8 x 3.6, Lysholm blower @ 11.6 PSI

bobgodd

yikes, i thought the compression was more like 8.5:1. has anyone damaged this engine from too much boost??

prodigymb

9.0 is a very boost friendly compression, especially for the boost levels people run here

jangy

Max boost I have seen with a large pulley is 18psi at the peak. I've datalogged mine at 16psi before... I have no idea if that is ok or not..

OutlawAMG

Higher comp ratios w/ boost arrived with more efficient combustion (mid 90's) For example, the 1G Turbo Talons were 7.8:1, 2G's were 8.5:1. And in NA config, 11.5:1 is common for all cars these days. It promotes better efficiencies (emissions) and power at the same time.

bobgodd

I still have a lot to learn about F/I cars, this is my first one.

I would also like to know about cam profiles however, hope someone chimes in on that one!!

Pepsiguru

I'm a newbie to the MB world but just curious. What is the factory setting on boost on an AMG E55 ?

BTW, I hope to be joining you guys soon with an 05-06 E55 . . . sometime in 2009

blando

I could be wrong, but I recall the stock boost on my C32 is around 14 and with the pulley I have it runs up to about 16-17. The C32 has the same 9:1 compression that the E55 has. Some C32 members have larger pulleys that get the boost up to 19 or 20. They've been running them for some time without incident.

suicidal4life

I posted 2005 E55K cam spec's in this thread

https://mbworld.org/forums/w211-amg/...rger-cams.html

Wryfox

I have a set of published specs from AMG saying 13.0 psi. Is this a us/euro difference in models?

prodigymb

11.6 PSI came straight from a Motortrend article on the E55. Can you link to your info? Does anyone have a boost gauge ??

this article also says .8 Bar which is 11.6psi
http://www.prnewswire.com/cgi-bin/st...1890363&EDATE=

now this article says 13.1 which is .9 bar. however they were testing a euro spec car here ....
http://www.caranddriver.com/reviews/..._amg_road_test

blackbenzz

I agree. And you dont want to be spinning the supercharger too fast with lower compression because then you run into heat issues from the charger. The higher compression also provides more power at the same bost level and better driveability off boost (not that it really matters with our instant boost chargers but its more of a concren with turbo cars)

HYEPWR

GENERALLY.....17-20psi is the limit for boost on 91-93 octane gas. Obviously a lot depends on the combustion chamber design and various other factors.

That said the numbers that are being thrown around are really meaningless. As far as I understand---the 11.6psi/13psi number; and even the data logged numbers are at the supercharger outlet. That compressed air then has to go through the intercooler which eats up a TON of boost. To get an Idea of the REAL boost that is in the COMBUSTION chamber....youd have to place a boost gauge AFTER the intercooler.

If I recall correctly---Vadim mentioned once that the intercooler eats up almost 4-7psi of boost! So your gauge/data log may read 16psi...but in reality the boost is actually around ~9psi. This number jives with general 'boost" theory....ie the amount of HP 1psi of boost should develop on 5.4L engine.

This is why our cars have very little in the way of detonation problems....even with a pulley---we're far far away from the limits of pump gas. If our engines were actually "seeing 12-13psi" our cars would be making 550rwhp++

splinter

IIRC, the ECU’s – and datalogging - MAP reading is sourced downstream from the intercooler core:


photo credit Finny

prodigymb

meh to be honest with you i just dont see the small intercooler "eating" that much boost unless there is a boost leak.

here is a photo of the intercooler i had on my gti and pressure drop from that was ~1.0 PSI. but this thing was massive !

HYEPWR

definately cant argue with that pic....but isnt that large hole the bypass hole which is pre-intercooler.

The intercooler in the pic is very large and well designed---imagine the same volume of air going through a much thicker and smaller worse designed Intercooler. Backpreasure would rise for sure.

If you look at the 210 e55 NA engine (10.5 compression ratio). It put out ~ 300whp. Lowering the compression to 9.0:1 in the 211 will probably give you somewhere in the neighborhood of -4% decrease in whp...or 285whp.

So thats the starting point......285whp......Now add boost....theoretically each psi of boost should increase hp by 6.8%...(under ideal conditions)

boost-----whp
0psi = 285whp

5psi = 380whp

7psi = 430whp <-----most stock E55's are here

8psi = 450whp

9psi = 465whp

10psi = 485whp <---avg for a healthy pulley car

12psi = 515whp

14psi = 550whp

16psi = 580whp


I guess my point was that if the cars where really putting out 12-13psi stock--then the whp we would measure would be about 520-540whp....and not 410-420whp.

who knows...

blackbenzz

Power isn't really about PSI but airflow. You can have a sc, GT28R, and GT42R at the same boost level but they will all make different power.

prodigymb

absolutely.

but intercooler and overall charge piping efficiency is measured by the pressure drop from start to finish.

here is where having a turbo is nice, since it will work harder to compensate for pressure drop to get the boost up to the requested by the ecu

splinter

photo credit Finny



blackbenzz is correct.

It is not the backpressure being generated behind the intake valves that ultimately determines the power an engine generates, although there's no denying its increase has proven beneficial for some of us. Rather, it’s efficient flow throughout the works that we’re after.

OutlawAMG

There isnt a spec sheet online anywhere? An online intuitive owners manual even?

HYEPWR

I agree with this as a general statement when comparing various different platforms; but in a closed system (ie--same engine) you can refer to psi. This is because you assume the system is closed and constant.... that the back pressure will remain the same.

In your example of the different turbos...the GT42 will have significantly LESS back pressure due to the exhaust housing being so much larger. Like putting headers and exhaust on a stock E55. Even though the s/c is boosting the same "psi" the back pressure is far less---thus you get more power. That is obviously a change in the system. lemme put a 1/2 exhaust on that GT42 and I garuantee it wont make the power of a GT28 with a 3inch exhaust at the same boost level.

If an engine at sea level makes 100hp; and you can add 5psi of boost to the same engine without altering it---you would expect to get (5+14,7/14.7)=34% increase in power due to a 34% increasee in airflow.


anyhow....great pic splinter

ABALONE

Couldn't this be one of the reasons that all these Corvette C5 5,7L with superchargers running 12-15psi is making way over 500whp and up to 550whp and more,cause it's real 12-15psi we are talking about?

I've always been wondering why our big 5,4 L V8 AMG engines don't respond like other big engines in other cars do when they are supercharged.

Interesting question actually. Makes me wonder how many psi/bar the KLEEMANN N/A for M113 actually deliver if they measure after the IC They say 0.5 bar or ~7psi and it brings the 354hp engine up to "only" 470 crank HP. I've always thought 0.5 bar in a 5,4L V8 engine should be more like 550-570 crank HP. Guess somethings wrong here