Engine stand flex

[KBA]

How much should an engine stand/ engine/ prop move when you get on it . I recently switched to a bbc with alot more torque noticed the engine stand moving moving forward about an inch when i run it up

 

[OneBFC]

ideally? Zero stand / rigging movement under throttle. Seriously.

And it ain't torque causing you to have more thrust now. It's the additional power you have.

Flex leads to fatigue failure. Material properties dictate how quickly that failure occurs. Some material like regular steel (that rusts) has extremely good fatigue strength and can handle some flex indefinitely, but, I sure wouldn't rely on that long term.

Good luck with the solution. Be safe, for others sake.

:usa:

 

[SWAMPHUNTER45]

Something is bad wrong if your engine stand is moving an inch forward under load.

A catastrophic failure may be eminent.

 

[CarMotorBarge]

You are definitely making too much HSP. 8) You need to run supports (square or round tubing) from the engine mounts diagonally down and forward a couple of feet to the stringers. You see this done all the time on race boats. This will reinforce the top of the engine stand and keep it from pushing forward. You can also run the supports straight forward to the rigging if the rigging is strong enough.

 

[KBA]

Thanks for the info . its all stainless rigging and i will add more gussets and tie it into the seat stand . That should eliminate any movement