Engineering question

100 pounds won't even come close to bending it.

According to my steel tables the piece you have should support 2,800 pounds without a problem.

OK, that was way too easy for you. I need to ask this before I head south.

I'm buying a boat that will have a big block V8 engine in it. I don't know the weight of a big block engine so I'll guess 3000 lbs. The boat beam is 8.5 ft. If i ever need to pull the engine, I'll go to the local lumber yard and build pillars for either side of the boat and lay a steel beam accross. How big a beam do I need?

I'm looking at a less expensive version of this

Karl

A big block V8 gas engine should be under 1,000#.

Unless you're talking about a truly immense engine, you have too many zeros in that figure.

I see the boat in your link has a 5.9 liter Cummins Diesel. My pickup truck also has a 5.9-liter V-8 (tho not a Diesel) and the *entire truck* weighs about 3800 pounds.

I figured, but wanted to ask someone who would know. I like to have a 3+ factor on my rigging. This is sure going to make it easier to move that welder all over to weld out all the little connection points. I made a 6' high stand on my little ATV trailer. It was more stable than I thought it would be, but still the hose is too short to reach everywhere.

Steve

Chevy's heaviest contemporary engine weighed 685 (427cid), Ford's 720 (460cid), Chrysler's 745 (331 hemi).

Cadillac had a V-16 in 1931 which weighed #1,300!

chart.

-- Happiness lies in the joy of achievement and the thrill of creative effort. -- Franklin D. Roosevelt

Well if it's a BB gasser the engine and drive will top out around 900 pounds.

Just grab 3 6X6 wood beams and brace them up. Will hold all of what you have with no problem.

If you have the steel laying around then anything over a 6" I beam 9 pounds per foot in either S or W section would do the job with plenty of safety factor.

If the boat engine is a diesel it will be heavier, but likely still under 2,000#

You guys are all forgetting about the tranny that comes out with the engine. Marine engines blocks are far larger allowing for raw water cooling. I think 3,000 is still a good guess.

Karl

If you aren't separating the tranny first, that certainly adds weight. It certainly doesn't hurt anything but the wallet to have more safety margin in the lift system.

Don't look for an answer from gummy ass - he isn't an engineer.

Hey why don't you just CHILL. You got no room to talk about somebody else not being perfect.

Karl

Don't let him get you riled, Karl. He's just an obsessive stalker who'll be gone off to fight with another windmill in a couple of weeks. The only thing he's got that's metal related is that plate in his skull.

Steve

Prickly, aren't you?

yep not much tolerance for the likes of rude hateful people.

Well, you could look up all the bending schtuff, like elastic modulus and yield strength, in Machinery's Handbook, but at a gut level I'd think that

2 x 2 x .25 tube would laugh at a measly 100 pounds. Can you wedge one end between something (maybe clamp it in a MONGO vise) and support your own weight at the far end?

Good Luck! Rich

plonk

You tripped my trigger on how to make a portable hoist frame. I'll start with two warehouse loadrack uprights and two warehouse load beams. make the uprights into A frames that bolt together. When needed make up A frames and use the loadbeam pins to put the loadbeams in place. it will all break down into a small stack for storage.

At least for me, just talking about something gets the creative juice going.

Karl

Not usually. Marine engines are normally built with a standard engine as a base with added "marine" accessories like the heat exchanger, etc., and possible a heavy flywheel or crankshaft if designed for commercial use.

-- John B.