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Finn,
My suggestion is go to Paul Yaws
excellent technical article on intakes and exhausts at
There he lists the stock port timing specifications
as well as some of the more radical Racing Beat port timings.
Me, I wouldn't know how to measure the port
timing. Maybe you could stick your finger in the port and slowly turn
the crank until you feel the side of the lobe, then measure the E shaft
degrees off the crank pulley {:>). Perhaps Lynn or someone has a
process for doing so. I think I recall someone showing the process
on a side housing, but that was a while ago.
If you engine has stock timing then its no problem,
or if you are certain what any modifications to the timing are. Port
timing can make a quite a difference, so guessing is not
recommended.
Ed Anderson
What we now need is a table of IC and IO values for different year
housings and portings.
Or maybe an illustration on how to measure
them.
Finn
Ed Anderson wrote:
Ok, Folks
The DIE related products include:
PDF of the Slides used in the Shady Bend presentation 1.4 Meg
PDF of the Formal (sort of) Mathematical derivation of the equations 225K
PDF of a short summary of the equations Attached to this e mail 95K
Excel DIE Spreadsheet for doing your own DIE calculations. 250K
However, for those of you interested, I have attached a very brief
summary of the DIE equation derivation. Its only two pages, with some
graphs attached and is probably not that easy to follow without the expanded
step by step derivation process shown in the full up presentation.
Hopefully, it will keep those interested in the DIE occupied until the
full-up presentation is on the RWS web site {:>).
Best Regards
Ed
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
eanderson@carolina.rr.com
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