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Old 7th November 2019
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Well, if that ain't interesting.

The smaller bolt holes actually reduced vacuum.
(maybe the higher restriction doesn't immediately suck the umbrellas shut, allowing less vacuum to form on upstroke?)
And they also offer more control of CC pressure throughout the RPM range.
(maybe like bustert mentioned but as in preventing over-whelming the overall pressure)
It creates lower pressure swings.


Starting height:


Same RPM (1000), one bolt restricted:


Begin test RPM (1000), both bolts restricted:


2000 RPM:


3000 RPM:


4000 RPM:


5000 RPM:


edit:
Now I gotta go and redrill some some more bolts.
I left the A/C off since it doesn't change anything.
There was no noticeable oil mist coming out the breathers during this round.
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Last edited by Hippysmack; 8th November 2019 at 03:10.. Reason: moved pics to Sportsterpedia
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