Re: highest compression on a cis e

[drew <drew@dyermaker.cs.uoguelph.ca>]

Agreed - when you increase the CR you're squeezing the air harder once
it's in the combustion chamber.  However, there will be no corresponding
increase in fueling as the volume of air that moved past the airflow
sensor plate would be the same as a low-compression 1.8/2.0.

Now, when you're talking turbo/super charging, THEN you're squeezing more
air INTO the combustion chamber, which will result in more fuel (as the
increased volume of air moves past the airflow sensor plate it will result
in more fuel.)

Drew

On Thu, 3 May 2001, Dan Bubb wrote:

> Absolute Bull. Increasing the compression ratio has nothing to do with
> mass air flow. How hard you squeeze what's in the combustion chamber has
> nothing to do with how much air gets in in the first place. Total
> pressure drop across the intake system, valve size, lift and duration,
> engine displacement and intake air temperature will determine mass air
> flow. CR may have some secondary or tertiary effect that is just as
> likely to decrease mass flow as to increase it.  The amount of fuel
> required also will not change, except for the possibility of running a
> little richer to forstall the onset of detonation.
> 
> Shawn Rader wrote:
> > 
> Raising the compression has roughly the same effect as
> > increasing the engines displacement - it increases the amount of air your
> > engine flows.  With more air you can burn more fuel which means more power.
> > By raising the compression from 11:1 to 12:1 your engine is flowing 9% more
> > air at any given rpm- about the same as increasing you engine displacement
> > from 2.1L to 2.3L.
> > 
> > -shawn
> > '81 S
> > 
> > On Thu, 3 May 2001 08:35:05 -0400, J Miller wrote:
> > 
> > >  i am courious what the highest compression rate that the cis e  injection
> > on
> > >  a 1.8 16 could handle,
> > >  i know 11:1 works fine but what above 12:1
> > >  i need a car and i am just goign to slap the 2.1L in with the stock EMS
> > and
> > >  a few other minor mods
> > >  Hey mr rust bucket i need an adjustable moduale
> > >  jonas miller
> > >  1976 2.0L 8v  scirocco   for sale
> > >  1987 soon to be a monster 2.1L
> > >  fzr 600 bleediun carbs
> > >
> > >
> > >
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Drew MacPherson, Network Analyst, University of Guelph

drew@dyermaker.cs.uoguelph.ca           |  visit the Massey-Harris page:
http://dyermaker.cs.uoguelph.ca/~drew   |  http://m-h.cs.uoguelph.ca


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