Date:         Fri, 2 Jul 1999 13:24:56 PDT
Reply-To:     vwvanman@EXCITE.COM
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Robert Lilley <vwvanman@EXCITE.COM>
Subject:      Re: removal of weight from flywheel and cam lift
Comments: To: vanagon@vanagon.com
Content-Type: text/plain

>I was wondering about the how you'll go about reducing the
> weight of your flywheel.


simply machine the weight from the outside edge of the flywheel.



 You said that you'd remove from the flywheel
> the same amount of weight as was added in counter ballancing the crank.
> I was just curious if what you intend to do is remove the weight from
> precisely calculated  locations on the flywheel so that the rotional
> inertia of the crank/flywheel system will be returned to what it  was
> originally, before the crank was counterballance??


No, from the outer perimeter only.





> While researching you upgrades and your past VW bus work, how did you
> learn about cams?  Like, what effects on engine performance does lift
> and duration and gear indexing the cam have??  Did you read up on this,
> if so would you tell me the references?  Or did you talk to the cam
> shops?

Talking with cam experts at can shops.





> So, what was the  increase of lift and duration that you
> specified for your cam?




>Why specify additional lift if you were already
> going to use 1.25 ratio rockers??

The use of the ratio rockers helped to increase bottom end torque to offset
the loss of torque by changing the duration and allow for more breathing at
highter rpms.  With a change in duration, the power band moves up the rpm
range.  Plus the lifters and valve train do not have to travel as far to
obtain the additional lift increase, so reciprocal weight does not increase
as much as with just going to a larger lift.  Less were on cam lobes due to
not as steep ramps.  Valve is also let down "gentler" do to not having the
ramps steeper.
>
> I've got a new header system--the S&S system and your point about the
> donut washer has got me a bit worried.  Do  header systems for other
> make autos have a similar set up to allow for flex?


I was wrong in my analysis.  I had had my Vanagon for a short time and had
not taken my exhaust off yet.  It does not flex as I had mistakenly thought
so.

The importance of the doughnut gaskets are to allow it to align up.





It was nice to read that you advocate ceramic
> coating as well.

I like the fact that my head gasket problems woes are over...



Robert




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