Ready for some Wierd Science?
Here goes! You've heard Paul continually ask people if they have cleaned and properly oiled
their air filters. Here's how and why.
These are three dirty filters, progressing left to right from "Not too dirty" to "Pretty damn dirty". The characteristic dark spot is on the side of the filter opposite the air filter door. That's the main incoming stream of air from the back of the airbox.
To clean them I took a half a pint of gas and put it in a container, then simply soaked and squeezed and soaked and squeezed until the filters were clean. I then did a final rinse with clean gas. This is what the half pint of gas looked like after I was done.
Inspect the filters for foam shredding, which indicates extreme age, and seam separation. This filter had some foam shred and a couple of seams were coming loose. This filter has had seam repairs in the past which were in good shape. I discarded this filter because the foam was degrading. It had seam separation, but the seams were not completely loose.
To oil the filters I put a couple of ounces of filter oil into a large Zip-Loc and kneaded the filter until it turned a uniform color. My filter oil, FFT, is blue. When it is properly kneaded in the filter turns a light green inside and out.
Now, just what is it that is being filtered? To find out I filtered the gas and poured what passed through the filters into a graduated cylinder. I set the cylinder and filters aside for three weeks so the filters could dry and the dirt in the gas could settle to the bottom of the cylinder. Here's what the cylinder looked like the day it was filled.
This is what it looked like three weeks later.
The stuff that is suspended in the gas is so fine that it won't settle out, except for a very small bit, as you can see in the bottom of the cylinder. It's not as much as it looks like; the bottom of the cylinder has a punt in it much like a wine bottle.
More to follow.