[W126 Coupe] How to gain 112 bhp

[Bill P.]

Or you could just run a hose from your AC into your intake and get a cold
air induction system!   ; )

Bill P.
P.S. Please don’t take me serious on this one!  But if you do let me know
how it turns out!

-----Original Message-----
From: mbcoupes-bounces at mbcoupes.com [mailto:mbcoupes-bounces at mbcoupes.com]On
Behalf Of Robert Karl Stonjek
Sent: Monday, April 17, 2006 19:18
To: MB Coupes
Subject: Re: [W126 Coupe] How to gain 112 bhp

It's my understanding that one can actually test these theories with a
measurement of sorts.  When you screw out a plug and screw in a compression
tester with, say, the coil disconnected, you get the engine compression
ratio (assuming that the thread on the tester is long enough - shorter
thread or even push on types leave a cavity where the plug was and this
cavity lowers the compression ratio as measured).

But if you start up the engine, on 7 cylinders (hey, some cars even run on
6!!!) and burp your compression tester, you'll note a lower compression.
This is because any resistance to the air being sucked in lowers the
pressure of the air drawn into the cylinders and therefore the compression
as measured.

So, if you now change the air induction and retest AT THE SAME REVS you can
see the difference with the higher the pressure the better.

I purchased a nice little tester and did the engine-off compression to
confirm that my engine was a 10:1 compression and not a 9:1.  I measured
9.5:1 - slight cavity at the end of the tester's plug, the age of the engine
and possibly air resistance at cranking speed conspire to lower the measured
ratio from the original 10:1.  But there is no way I have a 9:1 engine -
after finding so many bits meant for the low power version I was starting to
wonder if someone hadn't just changed the exhaust manifolds etc ...

So, has anyone actually ever tested this theory for themselves?

I have it on my 'todo' list - maybe this week.

Robert



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