RE: DML:Hp differences at rear wheels

From: Bridges, Bruce (bbridges@alarismed.com)
Date: Wed Mar 24 1999 - 17:50:11 EST


Richard,
Since I have little to no experience (Yet) with the guts of a 42/44/46
trams, I defer to your research! I do know that the 727s will "rob" more
rear wheel HP than the 904 due to the various design changes between the
two. (hydraulic function, reciprocating mass, slippage etc.)
Need More data!
BKB

-----Original Message-----
From: V8dakLECC@aol.com [mailto:V8dakLECC@aol.com]
Sent: Wednesday, March 24, 1999 12:59 PM
To: dakota-truck@buffnet.net
Subject: Re: DML:Hp differences at rear wheels

In a message dated 3/24/99 2:17:38 PM Central Standard Time, H62300@aol.com
writes:

<< I think that this
 translates into the difference not being as much on the dyno between the
5.2
 44re
 and the 5.9 46re.Any comments? >>

I read in an online review that the only difference betwwen the two is that
the 44RE is a wide ratio version of the 46RE.

The following ratios were listed for the 44RE and the 46RH numbers are from
my
92 FSM.

          44RE 46RH
1st: 2.74:1 2.45:1
2nd: 1.54:1 1.54:1
3rd: 1.00:1 1.00:1
4th: 0.69:1 0.69:1

I am not sure what effect the first gear ratio change woud have on measured
rear wheel HP. I have never been on a DYno before, so I don't know what the
procdure is for measuring peak rear wheel HP (what gear is it done in,
etc.),
but since HP is directly proportional to torque and rpm, then a ratio change
should not make a difference. HP output = HP input - losses. Because
torque is multiplied by ratio, and speed is divided by ratio, ratio is not
in
the equation.

I know from reading my service manual (92) that the V6 came with a 42RH
(Hydraulic vs. Electronic) and the V8 came with the 46RH. From the service
manual specification, the only difference in the 42 vs. 46 was number of
clutch disks, and the first and second gear ratios. I have never figured
out
the exact correlation between the A500/A518 numbers, and the 42/46RH/E
numbers, but I always assumed that the A518 was the 46RH/E and the A500 was
the 42RH/E. But, this leaves the 44RE without an Axxx number.

Richard Lewis
92 LE CC, 318, Auto.



This archive was generated by hypermail 2b29 : Fri Jun 20 2003 - 12:13:20 EDT