David Brady <dmb@Synoptics.COM> writes
>All this talk about engine mods has me thinking about an interresting
>formula ... (the) upper limit to the speed at which any engine can rotate
without self destructing... is:
>
> RPM Limit = 4000/( S x .00656 )
>
>S equals stroke in millimeters
>
>At a sustained spin of "RPM Limit" the engine will certainly suffer
>broken rings, pistons, connecting rods etc. (Details Deleted)
Question for TITK WRT A-Series Spridgets:
What RPM limits do you use?
Is this a likely explanation for broken piston rings in my 1098 crank/1275
block auto-xer? According to the above formula, my Theoretical Break Parts
RPM Threshold is 7285 RPM, minus 10% => 6556 RPM. I *try* to shift as the
needle goes by 6500, but as you probably know, there's precious little time
to watch the clock.
I have plenty of breathing capacity, and have seen 8000+ RPM (gasp :-0 )
once. Is there any way to swing the balance in my favor so I can use that
extra area under the curve?
Thanks,
Ernest Davis
'66 Sprite, '72 Midget
wily1@aol.com
11/10/93, 7:14
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