I thought I'd show you the latest
engine parts. I wanted some good air flow so I went with the K
& N air filter. The element is 14" X 4" but is 5
1/2" tall overall ( which including the base). The base sits 9/16" above the carburetor
which is just right. I had a choice of different "drop-base" models but I
didn't think I would have the room and I was right after seeing how this
one fit. This one is close to
the top of the fuel bowls now so the other ones wouldn't have worked.
How did I figure out how large of a filter to buy? It's easy....just use
this simple formula and see for your self.
A = CID X RPM
20,839 |
A= Area of filter
CID = Cubic Inch Displacement
RPM = Max RPM |
So we have...
CID = 434 - RPM = 7000 divided by 20,839 = 145.78
Now if your using a round filter like I am, use this formula.
A
H = D X
3.14 + .75 |
A= Area of filter
H= Height
D = Outside Diameter of Filter
3.14 = Pi
.75 = Rubber End Caps |
So now we have...
A = 145.78 divided by (D = 14" X 3.14) + .75 = 4.27"
This is how you calculate the size of the
filter you want. Mine needs a 1/4" more in height at 7000 RPM but I
won't be living there so this should be more than enough.
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