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No, it is a matter of what is called a state property. When the pressure is reduced with a piston withdrawing from the cylinder the volume increases and pressure is reduced forming gases. I say gases because diesel fuel is a composite of several hydrocarbons. The trick is to keep constant...

I am curious as to how you approach bearing design in models where the crankshaft actually rides on a hydraulic oil film shifted a small amount off center in the engine being modeled. I would think the location and design of how the oil is given to the bearing would be critical even for models...

There is a mathematical way of chasing down scaling factors and one is the Buckinham Pi theorem. But there is no way the Reynolds number does not change so the skeptic in me says its not going to work using a scaling factor. The reynolds number is used to find the friction factor which depends...

Well except for the temperature of the heat source does not scale it remains at essentially the same combustion temperature. And the delta T driving force for the heat transfer will be the same only with smaller material thickness which should yield higher rates of heat transfer. That is the...

The Reynolds number is non dimensional number (has no units) and is a calculation based on viscosity of the liquid, its Velocity and the pipe diameter. Its practical use is often restricted to flow in pipes and across airfoils. Generally we want to know the pressure drop in the system. And...

Yes, Standard Handbook of Machine Design addresses this topic.(Schikley and Mischke) But be prepared this is a special topic involving the follower as well. It can also be found in engineering textbooks usually at the snd year of study of Mechanical Engineering. I am not a believer a cad...

There are good engineering reasons for using babbit bearings. A babbitt bearing is quickly run in and provides a smooth surface. Babbitt bearings have the ability to conform to small misalignment of the crankshaft. Its an art to fix them or repour the babbitt. If other materials are used the...

I have an T-Bird. It runs a 277 2 cycle Bombardier 27hp engine at 6300 rpm with gear reducer. I have a cylinder head temp and an exhaust temp. Exhaust gas thermo couple has to be within 6 inches of the port for accurate measurement. It is a simple gage to monitor engine health. There is a...

Go to u tube tubalcain #717 he has a two part video on this stuff. Trick is control of the temperature and time element involved tubalcain ie mrpete actually uses kasinite.

Yes, but only with larger engines. Carburetor design is tricky because you want the fuel to atomize into small droplets and be transported evenly to each cylinder. This is dependent on the manifold sizing or the runners to each cylinder. The values for velocity can be calculated along with...

When I inspected a weld the visual look gave me an indication of the skill of the welder but did not confirm the weld was good. I would look for under cutting, spatter, weld pattern, and usually but not always it was the first indication of a good or bad weld. I also knew I would not be able...

I have the same thought. A walk through a food processing plant will likely have all kinds of stainless unfired pressure vessels working at all kinds of pressures. And I have seen at least one commercial boiler size of about 30000 lbs per hour and maybe 300 psig in operation. It was a rare...

I think its necessary to reflect on what a drawing is for. Its primary purpose is to convey information to others. In that regard I have seen designs based on a restaurant napkin, sketches, 2d drawings, and 3d drawings. There are times when I use only a sketch pad for myself when I make...

I agree, but you have raised an interesting thought and that is how small a weld can be made and what would you use to keep the weld from blowing out on small materials. Time for a little research on micro welding. Using steel poses a corrosion issue that copper does not. However I have seen...

Welding is a certification process. The welding method itself has to be qualified and the joint tested. Names are given to the position in which its made and the materials used. The welder does a coupon weld and then is tested by testing the pieces he welded together. He or she is then...

Yes, there is a minimum wall thickness. It is determined by the design pressure. The operating pressure is below the design pressure. Once the pressure is known the stress on the materials is calculated. The materials are adjusted for the strength required by increasing thickness or choosing...

Nice work on this ancient concept. You could make it do a little work by placing magnets on the outer rim and have them pass the field through a coil. Not saying you would get a lot of power but you would get enough to light a small led. Need a bit more torque make the arms longer and put a...

I have worked with air compressors whose cylinder walls were embedded with Teflon. This was a special treatment for the pistons which ran dry. I cant help with how to do it because it was applied at the factory and then polished into the wall. There are some special applications of the stuff...

It looks like Al beat me to it.

By accident I came across this wiring diagram. It was originally posted to this forum. The drawing appears to have split the switch into a top and bottom half. It may or may not help. Not sure how the copying process will turn out. It is supposed to be for the lathe you are working with. It...