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I know the flexible aluminum drier vent ducting is easy to work with, but if you can use PVC or some other smooth walled ducting you'll have faster airflow due to the smooth inside surface. As an example, I've read that highly corrugated drain pipe has 9 times the flow resistance of smooth...

Here are the airflow efficiencies I found in a library book for smooth duct openings with different shapes. (Ignore all the dots, I had to add them to get the solid lines to position correctly.) I thought you guys making your own cold air intakes and ductwork would find this useful. _________...

Every now and then the subject of gasoline composition and its properties comes up. For those who are interested, the link below will take you to a very good site which explains more about gasoline than you ever thought to ask. http://www.faqs.org/faqs/autos/gasoline-faq/part1/

I haven't seen or, to my knowledge, used this additive, though my Mobil 1 may contain some. I found a chemical structure for this compound and it looks like it can break down and release MoS2, the slippery black moly we're familiar with. I believe it has good lube qualities, especially for cold...

Sirs, Thank you for having an interest in my work. I've been freely sharing my info with anyone who was interested. I visit your site for help with my car or to try giving advice to others, and I learn a lot. Being able to visit your site for info really helps me understand my car better than I...

I have designed my own air filter that seems to have advantages some others don't but I have no way to test/evaluate it. I think it should flow better than some and also have a high filter efficiency, maybe better than most. I'm concentrating on efficiency and not compromising airflow in the...