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Put throttle into reverse while going fast

Old 05-08-2019, 07:10 PM
  #121  
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Originally Posted by bilbndr View Post



So much good thinking and theory here. How about someone test it out and report back.
they did. It broke their engine. Except on THT where it couldn’t.
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Old 05-09-2019, 03:20 AM
  #122  
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whats the best oil to use to run the motor in reverse 40-10w
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Old 05-09-2019, 04:21 AM
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Originally Posted by brownman View Post
whats the best oil to use to run the motor in reverse 40-10w
Yes, but only if you are south of the equator
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Old 05-09-2019, 04:47 AM
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Y'all people are bat sh!t crazy. I guess I'm the only one here that fully grasps this concept.

Now the real question is... if his motor didn't hydro lock, how much further did he have to go to get to the end of the flat earth?
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Old 05-09-2019, 06:32 AM
  #125  
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Originally Posted by dave8311 View Post
A prop being pulled through the water at 30 mph will not spin?
Not if in gear. Seriously? Did any of you who think this way graduate High School where they taught physics?!
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Old 05-09-2019, 06:39 AM
  #126  
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Originally Posted by P G T Beauregard View Post

Not if in gear. Seriously? Did any of you who think this way graduate High School where they taught physics?!
Not true.
Yes, seriously.
Yes.
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Old 05-09-2019, 07:01 AM
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Originally Posted by Kr_1315 View Post
Not true.
Yes, seriously.
Yes.
Ok. Take a boat with multiple engines. Leave one off but turn switch on and in gear. Open running engines to full speed and as soon as prop turns on off engine it should start from prop turning engine. Good luck morons.
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Old 05-09-2019, 07:07 AM
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Originally Posted by P G T Beauregard View Post

Ok. Take a boat with multiple engines. Leave one off but turn switch on and in gear. Open running engines to full speed and as soon as prop turns on off engine it should start from prop turning engine. Good luck morons.
I've done just that. The windmilling prop did start the engine.
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Old 05-09-2019, 07:07 AM
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Originally Posted by P G T Beauregard View Post

Not if in gear. Seriously? Did any of you who think this way graduate High School where they taught physics?!
An out board/inboard outboard prop will spin. Take an outboard boat on a plane and shut off the key.The prop will spin the opposite direction and you'll here a clicking sound from the clutch dog gear.Just go put your boat in forward and turn the prop in the opposite direction.
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Old 05-09-2019, 07:08 AM
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Originally Posted by P G T Beauregard View Post

Ok. Take a boat with multiple engines. Leave one off but turn switch on and in gear. Open running engines to full speed and as soon as prop turns on off engine it should start from prop turning engine. Good luck morons.
Now that would be a good test - Who will try it? This should not cause any damage to the engine, but will prove or disprove the line of thinking.
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Old 05-09-2019, 07:14 AM
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Originally Posted by P G T Beauregard View Post

..............Good luck morons.
Some morons need less-ons ............
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Old 05-09-2019, 07:38 AM
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Originally Posted by WillyC27 View Post




Yes, but only if you are south of the equator
You bring up a good point. I don't think the OP stated where this event happened. I did hear somewhere that, south of the equator, engines run backward. A friend of a friend told my cousin he was hauling ass south one day when he forgot to slow down at the equator. He hit that equator so hard, the engine suddenly went from full throttle forward, to full throttle backward. True story.
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Old 05-09-2019, 09:29 AM
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Originally Posted by P G T Beauregard View Post

Not if in gear. Seriously? Did any of you who think this way graduate High School where they taught physics?!
If you read my post you would have seen where I intentionally put the emphasis on being in NEUTRAL.

Did they teach you reading comprehension in High School?
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Old 05-09-2019, 12:22 PM
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Originally Posted by brownman View Post
whats the best oil to use to run the motor in reverse 40-10w
Originally Posted by Corndog38 View Post
I've done just that. The windmilling prop did start the engine.
uh huh
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Old 05-09-2019, 12:55 PM
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Just think of all the motors that have been destroyed when being towed in without fuel, or some other reason and by accident was left in gear and the prop was spinning and sucked in water...........
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Old 05-09-2019, 01:06 PM
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I had a racoon in my boat while offshore, it was rabid and attacked while I was running 35 knots, I pulled the motor into reverse. The racoon died and I blew my motor from the reverse rotation and hydro locking.
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Old 05-09-2019, 01:30 PM
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Originally Posted by dave8311 View Post
If you read my post you would have seen where I intentionally put the emphasis on being in NEUTRAL.

Did they teach you reading comprehension in High School?
If in neutral how will it turn the engine and cause the exhaust ports to open. Of course it will spin in neutral.
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Old 05-09-2019, 01:44 PM
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Originally Posted by P G T Beauregard View Post

If in neutral how will it turn the engine and cause the exhaust ports to open. Of course it will spin in neutral.
Didn't say it would.

Never did, in any post.
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Old 05-09-2019, 02:50 PM
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I would like to thank the OP for this very entertaining thread (and hereby subscribe)! So, as I understand it thus far:
  1. A claim was made that you can hydrolock an engine by shifting into reverse at high speed;
  2. The claim is backed up by multiple first hand experiences;
  3. The claim is further backed up by manufacturers' warnings about doing this;
  4. The claim is not only disbelieved, but ridiculed;
  5. The evidence against the claim is:
    1. It seems impossible;
    2. Therefore it's not true;
    3. And if it were, you could jump start an engine at speed;
  6. First hand experience of jump starting engines at speed is posted;
  7. See line 4.
Did I miss anything?
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Old 05-09-2019, 03:17 PM
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I used to own a 19.6 Aquasport that had twin 85 hp evinrudes, I would often start one engine by dragging the prop (put in gear with the other motor moving about 10 mph)., it really didn't take much speed either. Never hurt the engine. I prolly did it 20 times or so. It was a beater boat that i kept in St James City fl, at my grandparents house.
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