Date: Sun, 24 Oct 1999 03:03:20 MDT
Reply-To: CARY CHIANG <chiang1@USA.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: CARY CHIANG <chiang1@USA.NET>
Subject: Questions for the Engine Builders Re: high lift rocker arms
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Dear Builders:
Please have patience with me, and hold the flames till I'm done...
I seem to recall that a VW magazine this spring did an article on high lift
rocker arms (maybe Fast German's?) on a modified Bug motor. The before and
after dyno tests showed a maximum improvement of about nine HP at about 4500
RPM (I think). My recollection of details is sketchy because I wanted to buy
the rockers for my Westy but became disillusioned by the test results and
discarded the article. Anyway, did anyone else read that article and can
confirm my numbers? I realize a waterboxer is not a bug motor, but aren't
they similar enough to draw a comparison (My ignorance of cam profiles, valve
sizes, cylinder displacement etc. of the two motors not withstanding)? Are
not the performance rocker arms the same? Forgive me for asking questions
without knowing all the facts, but bottom line; is 9HP gain on one test versus
22HP on another using similar(?) motors reasonable, or am I all wet?
Cary (Ready for the flames, 'cause its a dry heat!)
Robert Lilley <Wolfvan88@AOL.COM> wrote:
http://www.volks-motorsports.com/
http://www.volks-motorsports.com/C-R_DynoManufacturer.html
http://www.volks-motorsports.com/NewDynoResults.html
If you look at the chart, adding the rockers "ONLY" added 22 HORSEPOWER at
the wheels...
(90HP + 22HP= 112HP A 25% increase in power on a STOCK engine)...
Imagine the HP AFTER COMBINED with ALL the other mods I made...
SO, adding 45% might NOT BE SO HARD after all folks...Plus with no additional
stress only reduced stress on engine...
Heads
Cam
Exhaust
Crankshaft
Flywheel
Fuel pressure regulator
Lightened valve train
Ratio rockers
Use of synthetic oils
Friction reducing coatings
Throttle body
Match porting intake and exhaust
Air filter changes
Blueprinting parts
Adjusted timing
Plus CAREFUL assembly...
A lot of little changes add up to a bigger change.
Robert
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