Re: [DMCForum] Re: throw-out bearing replacement

[Andrei Cular <acular@xxxxxxxxxxxxxxx>]

Walter Coe wrote:

>Yeah, that is educational, but I had to remove the "*" to
>get the site to work.  How did those get in there?
>
>  
>
I did a copy paste, and the site I pulled the link from must have had 
something BOLD, and when FireFox sends plain txt messages BOLD is 
replaced with **.

>>From the 1930ish Ford club that my dad was into, they would
>remove about 12 pounds from the flywheels, but they also had
>the crankshafts balanced.  Those engines were rather
>primitive.  I didn't know that a balanced crank was a
>prerequisite for a lightened flywheel.
>
>  
>
Every engine I have rebuilt I have the crank balanced.  For the minimal 
cost  if I can get an 150k miles rather than 145k its worth it...  And I 
don't have to worry about the engine shaking its self to pieces if I 
ocassionaly take it to redline.  If you really want a smooth engine you 
need to balance the con rods, total and each end, as well as the pistons.

>With the PRV being odd fire & designed to be rather shaky, a
>lightened flywheel sounds like a bad idea.  Hey, maybe we
>should make them heavier still? ;-)
>
>  
>
If you really want to smooth out the engine, the simplest thing is a 
liquid filled harmonic damper.  Or you could design and build a balance 
system.  Porsche 944's and 928's have balance shafts which have off 
center weights and are timed to counter the vibrations developed by the 
engine.  The system works really well, I ran my 944 with out the balance 
shaft timing belt just to move it felt like an old V-twin.

Andrei

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