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Personally and as some have said, probably better off looking for an old vise. I've got two on my metal working table, a second hand 8" wilton and a tilting and swiveling Bridgeport vise. Using that Bridgeport vise as a bench vise is one of my smarter moves. It absolutely will not let go...

Good point, I'll see if I can enlarge the tensioner.

The test 13 hp had a 4" sheave and I spun that at 3000. Same slap.

I wouldn't think so, though at this point, who knows. The test motor was much closer to that, and I had identical slap.

This kind of where I'm at, I'm just not sure of the solution. I'm considering slightly restricting the intake so the flywheel doesn't over run after a compression. I'm just not real big fan of all this guess work.

Inline 3 cylinder Diahatsu

First go around I used standard B section. That was with the small engine and 4" sheave. I couldnt keep them on and figured with the tight bend of a 4" sheave it would be a good idea to go BX. I went banded because it almost always reduces issues, and it did a tad.

Idler is not worn, but i made it. Devilbiss didnt make this pump non electric and never with a tesioner. If i do away with it and just tension the belt, even over tension, slap is still there. I have worked on these as from factory, even the newer 2 belt ones didnt need much tesion. In my...

Yes sheaves clean and true. Alignment is dam good, everything is on the same plane. I might see if i can grab a video tomorrow. You really have to see the wave even on the drive side. Beings i had two engines with their own sheave setup, in my mind that kind of eliminates drive sheave or...

Original setup for the pump was a three phase electric 10Hp. Id like to see it with about .4" deflection at furthest span, which i get slap at. Ive ran it with less and more, and with too much and bare bones and still got the same slap. When i did that youd be lucky to get .2 deflection. No id...

Pic of the first setup with test engine, then with the diesel. Belt is lose on the second casue its not engaged.

Correction, 300 rpm is the minimum pump rpm. So 800 engine rpm is still in spec. Not that it matters, slap is everywhere. But so you know the ranges.

Slap is there anywhere from 800 to 2300. There is only a mild change in slap with RPM change, there is a slight brake in it but its about impossible to maintain. That happens around 1500. The pump must spin a minimum of just under 400 rpm for lube reasons, and cant be spun over 1000 rpm. With...

They have nothing on belt tension, but ive even tried making it on the far end of what a 3BX belt should be. While some slap will go away, again its seems to be more of doing something to mask the actual problem.

It just so happens I had a low hour Devilbiss 445 pump and a 200 gallon Devilbiss tank, not from the same unit. I really didn't need a compressor this big, just seemed like something that needed to happen. The first rendering was with a test engine of 13 hp with a 4" sheave. I'm on the real...

Hey guys and gals, I'm pretty much into or doing everything. Welding, forging, casting, auto and a bunch of other stuff. Hope I can be of help and have a few of my own questions answered from time to time.