Recent content by Kevin Johnson

Hi Ralph, Yes, I remember! I quote you on the opening page of the website too because I don't want people to have unrealistic expectations. A few things should be said though with respect to your installation. First of all, readers should understand that I also have an 86 Grand Wagoneer so I...

Hate to quibble but it is wrong even at the lower rpms. (I guess we could talk about p values and so forth in statistical analysis.) The gain is significant experimentally and practically for having done nothing else to the engine but remove one part (the scraper). I tried to be very careful...

We did dyno pulls with the little three-cylinder 993cc SOHC Metro engine -- the horsepower increased from roughly 2750rpm through 5300rpm. Despite having a stock full windage tray an average 3% hp was regained (at 5300rpm). Four pulls gave data ranging from 2.5% to 3.5%. The Metro three...

I agree that seemingly small things will skew your results with dyno tests so you need to be careful. I had run a series of roller dyno pulls about two weeks prior on an engine. The scraper I had then installed showed a small improvement over them and the shop owner wanted to stop there...

A local engine recycler lets me borrow cores -- I think I saw examples of the 4.0 you are talking about. If it is the one with a a steel bridge connector running along the main caps then, no, it will not interfere. The scraper sits at the plane defined by the oil pan rail. Some designs I...

Yes, for normal windage losses that is true -- the oil gets drawn into a cloud around the crank at higher rpm. On the little 2.2 engines Chrysler and Mobil regained 7hp at 6000rpm (9hp with Mobil-1). The design of the 4.0 is similar and the windage losses would be magnified. For off-road...

Re: Oil Return? Yes, the actual scraper has drain holes in it. I guess no-one ever thought of doing that before. Kevin