Re: alfa-digest V7 #620

[AlfaNeely@domain.elided]

In a message dated 4/7/99 9:11:59 AM Central Daylight Time, 
owner-alfa-digest@domain.elided writes:
<< 
 Date: Tue, 06 Apr 1999 22:25:06 -0700
 From: Norm Riffle <normriff@domain.elided>
 Subject: Pulleys flywheels and email
  	
 	Pulleys. Easy enough to make in aluminum whatever size you need.
 	A larger aluminum one on the water pump would still be better than the
 steel one. You're on your own taking the old one off and pressing the
 new one on.. ..w/o destroying the water pump...... good luck.
 	Alternator pulley is easier but not particularly large anyway. But the
 crank pulley...the easiest.
 	Unless your using RACING cams; i.e. spend ALL your time WOT at over
 6000 RPM, there's not much point. Water pumps cavitate and alternators
 self destruct at those kinds of rpm/use. 
 	Alfa ricambi at some point i think had a nice degreed aluminum one for
 the crank. stock size i believe.
<snip>

Norm,
	I am building an 84 Spider Veloce to run SCCA's ITB class.  The rule 
book for Improved Touring class allows oversize water pump and alternator 
pulleys.  It specifically disallows changing the crank pulley.  It would be 
far easier to chuck the harmonic balancer in a lathe and turn down the pulley 
size.  
	The main reason for changing pulley sizes is to reduce the amount of 
horsepower required to turn these "unnecessary" devices.  Turning them slower 
requires less power.
	A better solution, if the rules allowed it would be no alternator and 
an electric drive water pump.  And, of course, a battery charger in my 
paddock.
Ciao,
Russ Neely

 	
 

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