[W126 Coupe] went to dyno

Tue Sep 27 12:25:27 EDT 2005

I would love to get a scan of that if you have time.  The scans I have right
now are black and white, and kinda muddy.

I'd appreciate it if you can send it over to gdrakon at gmail.com

Thanks,

Eddie

  _____  

From: mbcoupes-bounces at mbcoupes.com [mailto:mbcoupes-bounces at mbcoupes.com]
On Behalf Of airedale at sbcglobal.net
Sent: Tuesday, September 27, 2005 8:50 AM
To: Mercedes Coupes Mailing Lists
Subject: Re: [W126 Coupe] went to dyno

Eddie,

Back to your original question:

"The projected power figures almost exactly match the amg 117 5.6 SOHC
engine with tubular headers (but i am running euro 4 piece cast manifold
still). so....does anyone know what was renntech's advertised hp and torque
for the 6.0? What other modifications did AMG do to the 5.6 SOHC besides
cams and headers?"

I have a Motor Trend Road Test dated August 1987 titled:

Mercedes - Benz

560SEC AMG

Four cams and 32 valves equals high performance for high dollars

Could that be of any value to you? If so I will scan and post here if
possible or send to you. In fact this article I purchased on eBay is an
extra as I bought a book of reviews that includes it. If you wanted the
original for better photo quality you or anyone else interested could have
it for the $4.50 I paid plus postage.

The article mentions 5953 cc

375 HP @ 5500 rpm

407 lb-ft @ 4000 rpm

Best,

John

----- Original Message ----- 

From: airedale at sbcglobal.net 

To: Mercedes <mailto:mbcoupes at mbcoupes.com>  Coupes Mailing Lists 

Sent: Tuesday, September 27, 2005 10:09 AM

Subject: Re: [W126 Coupe] went to dyno

Thanks Eddie,

I tend to agree with you as the book was published in the UK. The only other
place I saw the 272 HP figure mentioned was in another book article in
conjunction with the European Kat model as you mention. Thanks, this is one
less thing that I have to ponder.

Best Wishes,

John

----- Original Message ----- 

From: Eddie <mailto:cyberdrakon at hotmail.com>  

To: 'Mercedes <mailto:mbcoupes at mbcoupes.com>  Coupes Mailing Lists' 

Sent: Monday, September 26, 2005 10:37 PM

Subject: RE: [W126 Coupe] went to dyno

There are several possible reasons for the higher HP and torque figure, but
most likely the editor got the engine's mixed up and thought the US engines
are the same as Euro engines with Kats.  In fact, Euro engines with emission
controls are still more powerful than US because of higher compression ratio
(which was specified after some of the initial technical specs were
published).  The US engines had lower compression because during the initial
release period the US fuel still varied too much and could cause
knock/ping/pre-ignition.  Same problem in Australia I believe.

Any other sources listing the higher HP?  Several people have dyno-ed stock
engines for our cars and they all come out to about 200 hp (varies between
190 and 205).  My engine is FAR from stock.  As a matter of fact, every time
I do any major work on my car I find something else that has been modified
(which means I have to buy more expensive parts)...for example last time I
had the front shocks changed I discovered to my horror Bilstein HDs are not
the same as the blue striped ones (AMG) I had in the car..which the shop had
already thrown out.

The previous owner didn't even have any idea as to what had gone into the
car and didn't keep much paperwork.  He just threw money at the car, and got
tired of it in the early 90s when this model was replaced (at 24k miles).
Plus he raced porsches.

Eddie

  _____  

From: mbcoupes-bounces at mbcoupes.com [mailto:mbcoupes-bounces at mbcoupes.com]
On Behalf Of airedale at sbcglobal.net
Sent: Monday, September 26, 2005 8:13 PM
To: Mercedes Coupes Mailing Lists
Subject: Re: [W126 Coupe] went to dyno

The book I refer to is:

Mercedes - Benz since 1945.

Volume 4: The 1980's.

A collector's guide

by James Taylor

This book can be found on the MBCOA website.

This is the quote I find on page 38 and there is at least one other mention
of higher horsepower and torque in the book.

" In the USA, for example, the emissions - controlled 5.6 - liter engine was
down to 272 bhp from the 300 bhp of its European equivalent. The difference
was academic, though: even the 272 bhp engine was much more powerful than
anyone needed in a country with a blanket 55 mph speed limit ! "

Later in the book while discussing various engines this is the description
of the 560 SEL/SEC

" 5,547 cc, 96.5 x 94.8 mm, V8 - cyl OHC, type M117. Bosch fuel injection.
300 bhp at 5,000 rpm; 325 lb.ft at 3,750 rpm ( non - US models. ) 272 bhp at
5,000 rpm; 307 lb.ft at 3,750 rpm ( US models. ) "

I have wanted to bring this forward for some time and since you seem to have
actual proof this seems like a good time. I am interested in any comments.

Best Wishes,

John

----- Original Message ----- 

From: Eddie <mailto:cyberdrakon at hotmail.com>  

To: 'Mercedes <mailto:mbcoupes at mbcoupes.com>  Coupes Mailing Lists' 

Sent: Monday, September 26, 2005 1:08 AM

Subject: RE: [W126 Coupe] went to dyno

The stock California( 50-state, federal, etcetera) 560 sends exactly 200 hp
to the rear wheels.  Taking off cats and installing headers gives you about
25 hp.  I have other modifications.

Eddie

  _____  

From: mbcoupes-bounces at mbcoupes.com [mailto:mbcoupes-bounces at mbcoupes.com]
On Behalf Of airedale at sbcglobal.net
Sent: Sunday, September 25, 2005 10:26 PM
To: Mercedes Coupes Mailing Lists
Subject: Re: [W126 Coupe] went to dyno

I am curious the year & model of W126 you have please? I have a book I
bought through the MBCOA that states the US version 560 is actually more
horsepower than the 238 or so that is advertised.

Thanks,

John

----- Original Message ----- 

From: Eddie <mailto:cyberdrakon at hotmail.com>  

To: 'Mercedes <mailto:mbcoupes at mbcoupes.com>  Coupes Mailing Lists' 

Sent: Sunday, September 25, 2005 8:29 PM

Subject: [W126 Coupe] went to dyno

Well finally got to a dynojet, interesting results...

RWHP= 256.1
RWTQ= 298.22

so using standard conversions for drive train power loss gives me:

HP= 299.6 -> 309.9
TQ= 348.9 -> 360.8

Note, this was with oversize (heavy) rims, and reinforced clutches in the
transmission. So that means my drivetrain losses may have been higher or
lower compared to normal calculations.

The projected power figures almost exactly match the amg 117 5.6 SOHC engine
with tubular headers (but i am running euro 4 peice cast manifold still).
so....does anyone know what was renntech's advertised hp and torque for the
6.0? What other modifications did AMG do to the 5.6 SOHC besides cams and
headers?

Eddie

  _____  

The MB Coupes Website!
W126 SEC Mailing List
Postings remain property of MB Coupes, L.L.C.

  _____  

The MB Coupes Website!
W126 SEC Mailing List
Postings remain property of MB Coupes, L.L.C.

  _____  

The MB Coupes Website!
W126 SEC Mailing List
Postings remain property of MB Coupes, L.L.C.

  _____  

The MB Coupes Website!
W126 SEC Mailing List
Postings remain property of MB Coupes, L.L.C.

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