Re: I-5 engine powers

[paul.heneghan@bbc.co.uk (Paul Heneghan)]

From: Mike Walder <miwa@premier.co.uk>

>Just looking at a few spec sheets, I was wondering if anyone could shed a
>little light on this question:  Why is it that my 82 2.2i of 2144cc size 
and
>Bosch K-Jetronic produces 136bhp/100KW, whilst a new 2226cc engine from a 
90
>or Coupe still only produces 136bhp/100KW, presumably with some kind of
>modern EFi.

>What's happend to those extra ccs?  And if this it true, whay are the 
modern
>cars performing better on paper?

The 136bhp figure only relates to the peak engine power at one particular 
rpm.  The newer engines produce the same peak power, but they produce more 
power at lower revs.  You really need to see the graphs - the area under the 
graph, particularly the lower end of the graph gives a more meaningful idea 
of how powerful the car feels under normal driving conditions.  I rarely use 
the 5800rpm (or whatever the actual figure is) at which peak power is 
developed.

BTW, my 1989 Avant 2.2E (2226) is quoted as 138bhp, 101kW and the late 1989 
2.3E versions (2309) produce 136bhp, 100kW (but they have cats).

>82 Audi 100 5E 2144cc inj (144k and 136Bhp if new!)

It probably still is pretty close to 136bhp now you've got the FI sorted 
out.  Audi's have often been known to produce more than their rated power 
once run in properly, and even with slighlty worn engines, do not deviate 
much from this figure over their life (assuming proper tune up).  Usually 
the first signs of a poorly engine are starting and idling problems.

Paul
paul.heneghan@bbc.co.uk
1984 Audi 80 quattro (144kmiles - will still reach an indicated120mph+ when 
I have the nerve and opportunity to try it)
1989 Audi 100 Avant (120kmiles - ditto)