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RE: RE: [T3] engine internal stuff

Wow, great information!

Hmm, you mean me and Leon are the ONLY two people who push our gas pedals
like they were a light switch? ;)

Right after I bought my (used) Jetta from the stealership I replaced engine
and tranny oils with synthetic and realized an increase of 5hp (average) and
.5 second off my 0-60mph timing.  I'm a firm believer of synthetic
lubricants...right volks? :)  See the bottom of this page on how I obtained
my results:  http://www.icbm.org/erkson/personal/mycars/jettastats.htm

What does "IR" mean for your carb calculation?

I read a small portion of the dynamic compression thread but it's honestly
too, too long and someone should condense it.  I'd like to know more about
the theory, sounds quite interesting and applicable to all cars (hmmm, what
about rotaries? ;)

Thanks for the info!!
   Toby Erkson
   '72 VW Squareback 1.6L bored and stroked to 2.0L, Berg five-speed
   '95 VW Jetta III GL 2.0L, P-Chipped, Jamex sport suspension
   Portland, Oregon, http://www.icbm.org/

>-----Original Message-----
>And, heck, you aren't riding at WOT all the time, which is all 
>that plot is good for...

>Here's one I use for a rough IR carburetion calculation: 
>VenturiMM=SQRT(RPM*CylCC/2800).  For a 2332cc engine (583cc 
>cylinder) at 
>6000rpm, that's about 35.33mm.  From what I've seen, typically 
>VW people tend 
>to stay on the liberal side of this estimate. 
>Then, as for throat size, you have a catch 22.  Big throat 
>size for the same 
>venturi size means better atomization on the main circuit, but 
>an overly 
>sensitive throttle response at your foot (can you say gas 
>mileage killer?  :-) 
>and poorer atomization on the idle and progressive circuits.  
>Smaller throat 
>size for the same venturi size means the opposite of above.  
>Keeping the ratio 
>of venturi area to throat area (VenturiMM/ThroatMM)^2 around 
>65-80% is good 
>Now, Weber 44IDFs come out of the box with 36mm venturis.  
>Sounds good to me! 
>As a sidenote, Weber 48IDFs come with a 40mm venturi.  But, 
>Weber 40IDFs come 
>with a 28mm venturi.  Too small!!! 

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