Withdrawal symptoms, cylinder index, CPU index?

[Dan Cordon]

> I'm having withdrawal symptoms - Cody Forbes came and picked up my *entire* 
> collection of five cylinder Audi cars and parts (well one car is still 
> here, he has to make two trips, there is just *so* much you can put on a 
> trailer, into the cars and into the bed of a dually . . . )
<snip>
> My cylinder index, however, took a hit - down 13 points (yes, I know 13 
> isn't divisible by five - he also got a Subaru Justy engine which I was 
> going to convert to power a generator "someday"), and that moves me from 
> "master of motors" down to "dilettante", and I don't like that. Somehow I 
> don't think buying a V-12 Jag to get the CI back up is going to fly . . . 
> or even run, if it is a Jag . . .
> 
> One item we never did resolve is the CI of a wankel engine. Is it "1", or 
> is it "3" or is it "the equivalent number of cylinders in a recip engine 
> which makes the same power" or something else entirely? My CI is now 
> somewhere between 24 and 27, depending on how we count the rotary engine.
<snip>

Ya, we never did resolve that. Actually, a cylinder index isn't that 
great anyway. What we should really do is a displacement index. To make 
things fair, forced induction engines should get a bonus...so lets 
multiply the displacement by the peak intake pressure (in absolute BAR 
of course). And engines with DOHC heads should also get multiplied by an 
additional factor of 1.1.

This still leaves a problem with the rotary. While the 13b is commonly 
called a 1.3L engine, for two crankshaft revolutions, it really 
displaces 2.6L of air. As such, I thing we should call it a 2.6L (or 
4.0L in the case of a 20b). Same goes for two-strokes. A 600cc 2-stroke 
displaces 1.2L every two revolutions (ignoring the horrible scavenging 
when off-pipe).

Shall we call this the "Equivalent Displacement Index?"

Current EDI for my running engines/vehicles is:
5.8L Ford (351W)
5.2L Dodge (318)	
5.7L GM (350)
5.0L Ford (302)
8.2L Caddy (500)
4.8L Ford (292)
2.4L Toyota (22RE)
2.6L Mazda (13b rotary)
1.6L Honda (D16Z6) - soon to be B18C1
4.3L Audi (2.2L * 1.8 bar * 1.1 dohc)

That looks like: 45.6L

Non-installed engines:
7.7L Caddy (472)
2.6L 13b
2.6L 13b
14.2L Dodge (5.9L ISB * 2.4 bar)

I know there's several people on the list that can stomp all over this 
though. Especially Cody...since he's now got all Mike's stuff :o)

Mike - Sorry to hear about the empty feeling of losing all your audi 
stuff. But glad to hear about all the extra space for V8 mods!

> I propose, therefore, that we create an additional index as a measure of 
> geekdom - the CPU index. How many computers do we have laying around? 
> Ground rules - they all have to be assembled and working, parts in a box 
> don't count. There are multipliers, as well - a working Linux system which 
> you installed yourself is worth "2", anything with a 486 or less is worth 
> ".8", and anything that runs CPM is worth "3" and belongs in a museum. 
> Hacked iOpeners that run are worth 1.5. So let's see, that puts my CPU 
> index at 12.8, which makes me a candidate for propeller-head geekdom.

I'm not in contention for the CPU index at all. My CPU index is 4.0 :o(

-- 
Dan Cordon
Mechanical Engineer - Engine Research Facility
University of Idaho



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