I don't think it depends on which is up or which is down because what it you were aerodynamically challenged and a slow faller and you jumped in and it took too long to get to the center and by then the earth rotated half way around, then wouldn't you come falling back out the hole you just jumped into head first?


Naw....naw - 'cuz if you dug the hole clear thru, you'd already be over there, right?

If you dug a hole from one side and as you stepped down on the shovel for the last time as you broke through to the surface would you go falling out of the hole if you didn't hold on to the sides? Scary..
How far would you fall up before you stopped?

 

Far out, dude........heavy - here would be there, then.

Can you dig it?

 

What if you were in the southern hemisphere and you tilted the engine 8* to the left and put it on a tread mill, will it fly....

 

Probaly not - but anybody trying to use that treadmill certainly would, tho..............

 

How about a thread specifically for discussion of the various myths and misconceptions surrounding Diesel engines, fuel, additives, operation, etc.

A few -

You can't wash a Diesel engine.

A Diesel's not making power if it's not blowing black smoke

If a Diesel doesn't have vacuum, how can it suck in any air

If your tank always has pressure in the summer, and vacuum in the winter - you need to drill a hole in the cap

Pour all your used motor oil in the fuel tank - Diesels run on oil

All Diesel's make Boost at idle - my Boost gage reads zero at idle, do I have a leak

Adding a gallon or two of gasoline per tank cleans the injectors and increases power

Adding acetone increases fuel economy

Ether is the best starting flluid for Diesels

Diesel oil is too expensive - it's just oil, I run whatever's cheapest, you don't have to change it but once a year, anyway

How can I turn off the turbo, to save the bearings on long trips - it only makes a couple psi on the hi-way, anyway

Etc.........

There are many more, and it could be informative, as well as interesting, to catalog those here, with the correct explanation intended to help folks take care of their Diesel-powered vehicle.

Will be some humourous response - even ridicule - because most will appear to have come right from the mind of Daffy Duck, or Wile E. Coyote, but they should be 'exposed' in print in order to 'expose' the truth.

The main scenario for myth and misconception is, a non-technical listener being subjected to a technical explanation - his\her mind overloads, and couches the data in familiar concepts from personal experience.

Another is, of course, the jerk talking double-speak with intent to up the bottom line, usually more successful with the wimmin-folk.

So, anything overheard in a service-bay, down at wally world, the adjacent pump at the service station, at the barber shop, the tire store, and let's not forget the bowling alley, pool hall, rest rooms, etc - anywhere guys hang out, and try to impress other guys with their skill and prowess.

Be a good thread, or not - opinions?

 

YEEEEAHH!

but about the engine clocking thing, if the engine is mounted, clocked a few degrees advanced, then it starts turning the wheels sooner, so it acts like it's making more power but you can only tell by the seat of the pants feel, not on a dyno or dragstrip.

 

Myth, misconception, or fact?

You're only pre-loading the engine supports, such that there will be little or no torque-compliance in the rubber isolators.

That has been done by various means in drag-racing circles for years, even to chaining the left side of the block to the frame, and including solid steel 'isolators' and pre-loading the chassis\suspension.

Since it is to eliminate drive-line torque-twist, a dyno would not indicate any change, but a trip thru the lites could.

"Clocking" the engine, or preloading, is fact.

 

dang, my deep technilogical b.s. backfired on me. but technically that's just taking the play out of the engine mounts and not the 'timing' of the engine relative to the chassis.

 

Nah - just figgered we'd better toss some factual stuff in before the thread got shut off...................

 

Fact is, Cummins make more power in the Northern Hemisphere than down under, due to the coriolis effect....

 

Iirc, various engineers offered a 'clocking' theory for the 225cuin lazy six, in a time long ago and far away .

Most shade-tree's explained it by associating the V angles of the bent-8 motors with their increased output as compared with the linear-8's of the period.

Always seemed to me that if the cylinders on the passenger-side of vertical - advanced - were more powerful than if vertical, then the cylinders on the driver's side - retarded - must be equally less powerful - such that the average should then be as if all cylinders were vertical.

If the V8 vs straight-8 argument held true, that is.

Didn't seem strange at all to me that two-to-four carburetors placed at strategic locations along those long manifolds would wake the big 8's right up - and some of the sixes.

 

Actually, on an inline engine, the most efficient power is made when the cylinders are vertical, because then the weight of the entire reciprocating assembly (pistons, rods and crankshaft) is assisted by the force of gravity on the downward power stroke.

Still in doubt?
- When's the last time you saw an engine mounted upside down?!?

 

hahahaha. I think that proves our point right there.

 

... and on North American dragstrips, you'll be a little bit faster on a northward pointing run, again due to the gyroscopic effect of the coriolis force.

 

Aircraft application to get the crankshaft higher in the airframe for prop clearance without obstructing the forward view by having cylinders hanging out of the cowling. Obviously a dry sump engine, last time this was done was probably in the 1940's sometime, maybe up into the 50's, but was very common in the 30's.