Rap 24 hp semidiesel, second start attempt. 

Best engine runaway ever! Balls of steel not to just depart stage left. I'd like to see more on this?

At least it didn't launch a connecting rod into the next town.

Sounds just like starting my car. Same starting procedure too

Well, it took the whole rest of the day to get the grin off our faces ;-)

you just don't understand. This ancient motor is ALIVE AGAIN, he just really wants to work!

Wow! Thats look very dangerous.

Great video! Reminds me that during the 1970s when I worked on M-B automotive diesel engines, they all had a butterfly in the air intake which would swing shut in the rare case when the engine could start in reverse and run on crankcase oil.

Thumbs up to you guys for man handling it and teaching it who the boss is.

VW TDI clean diesel demo.

That was exciting! Can't wait to see the engine running normally. Got to move to the next video!

I had a similar event with a ruston hornsby running away on crank oil, the crank drain was plugged and the con rod splashed enough onto the cylinder bore to run away, luckily they have a decompression lever. Glad you kept it together.

thanks for posted this video. very interesting to see this phenomenon. there are thousands of videos with hotbulb engines on youtube. but this video is unique in showing one going out of control like this.

it is is always good to see our engineering history bought back to life-it is only those of us adventurous enough, and with the desire to experience how things were in the golden days of REAL technology , who can enjoy such fine machines-thanks for the film-and oh yeh a lot of the finest crazies i know wear clogs too!

Excellent video... Looks like a nerve racking experience: I can imagine you had to fight your 'run away to avoid the potential flying metal' natrual instinct when both air intakes were blocked and it wasnt slowing down!

I love watching these things...so many times I've fired an engine not knowing what to expect and get that mix of accomplishment and terror when it starts doing things I don't want it to. Like running away and trying to walk off the pedestal. LOL....some other crazy things I've done...had a Chevy with a 396 and a bad bottom end, was looking for a way to destroy it for good and hit on the idea of taking the carb off and throwing gas directly into the intake with no restriction. I'm pretty sure that motor hit 10,000 rpm before it spalled out and seized. Scary. Sounded like it was going to suck in the entire atmosphere. I had a '79 VW Rabbit diesel that had a unique runaway condition...they have a gear-driven vacuum pump in the block where the distributor would be...the diaphragm in the pump was bad and under high loads (like uphill ramp onto the highway) the intake vacuum would overpower that seal defect and allow it to start inhaling crankcase oil. When it happened the sound of the engine would abruptly change, a lot more diesel clatter than normal, an incredible sheet of smoke behind me, then it would get a burst of power and wouldn't back down when I released the throttle. I'd have to fight it down to a near stop in high gear, then shut the motor off without pressing the clutch, that would finally kill it. Then when I'd get home, I'd find the air filter literally dripping with oil, and the oil level would be around 2 qts low. It was kinda scary and yet fun in a weird way. I finally rebuilt the pump so it stopped doing that.

Ride 'em cowboy!!

Fantastic video and very informative too. Very brave to stick with it. you are lucky it did not flip on you. Thanks for posting it.

The dancing diesel engine

Great video on what can go wrong and how to keep calm and correct the problum. I had a Le Roi engine run wild with the crank handel still on the flywheel in my shop. It walked all over hitting other engines and throwing the crank handel threw the shop wall untill I managed to pull the magneto wire and stop it. I know what you went threw. Phil

I watched this video 157 times. Every time... It got better.

That guy has balls of steel.

That fella sure has some balls albeit they were on the fine line of being lost and gone forever,loves a bit of old school.

Wow, that was really awesome to watch!

Awesome reaction...quick and smart.

Looks like you fellows have your hands full. Very nice engine good work!

Looks like a slightly more advanced Harley engine, but doesn't shake as much!

Sounds beautiful

Så himla bra , bland det bästa jag har sett på youtube på länge

Nice work! I wish you sucessful repairing of rare old engine!

What a monster! Great video!

Still one of my favorites on You Tube

Very violent, I hope everybody had their steel toed boots on :)

That's a wild beast.

You guys are very brave

looks nice and safe anyway, with all the gas lines getting tangled and the engine on top of them. top stuff.

looks like alot of fun

the beast has awake... This mechanic has balls from steal. I would run away while pissing in my pants :P

Literally unstoppable

wow. congratulations on getting it stopped. That was the scariest thing I'd ever seen.

Neat old engine. Glad it got under control before damage. A CO2 or Halon extinguisher would have been handy. Anyway, very nice old engine. Thanks for sharing your experience.

Looks like a good engine for a trans arctic passenger plane. Smooth, reliable etc.

THAT folks is a true handful!!!

just wow.. runs very smoth

good job keeping your cool! That's pretty hard when you have a monster like that on the loose!

I unashamedly admit, that would've freaked me out and would have probably jumped away... Also, even though it isn't supposed to run that high it sounded surprisingly nice!

good work guys.

Very scary, but you obviousely knew how to deal with it!

The CO2 extinguisher is a very good point, didn't think of that :-) Those red bottles are not fire extinguishers, they are propane (note the frost on the bottles) for pre-heating.

24 hp paint shaker

pretty smooth running...

Stout old beast that wants to run! Beautiful! :D

Wow that took you for a ride. good work

Scary and cool at the same time... NICE!

Built in the days when men were men. I was expecting the flywheel to grind it's way through the air cylinder. Beautiful to watch & scary at the same time.

I witnessed a Cummins 350hp genset throw a rod and then run on it's engine oil. Tach read to 3000 and was pegged for over ten minutes until the crankshaft siezed up. Runaway diesels are scary at best.

wow, what a machine !

I'd be to scared to even run! I'd be rocking back and forth in a corner sucking my thumb crying ''It wont stop, it'll never stop''

@ElectronikHeart The bottom side of piston traveling up, draws air into the crankcase through some kind of check or reed valve in the side of the block. As the piston travels downward the air pressure closes off the check and forces the air thru another set off check or reed valves, through the intake ports, into the combustion chamber. If the oil level in the crankcase is too high, the air passing thru is saturated with oil and will burn in the combustion chamber, until there is no more oil.

That literally looks like 24 horses are trying to get out of there. Nice job keeping your cool and not letting it get away from you.

thats is a brave old man.

Good job

Health and safety officers showing how to operate and engine properly!

Bear-tastic. I like the way the video catches that moment of "sh*t, sh*t, sh*t, sh*t, sh*t!" How was your hand afterwards, I noticed you checking it out.

@EATSLEEPDRIVE2002 You have no idea how close this was to a total disaster. If it hadn't been for one of two air intakes were totally closed prior to start, the engine would have revved to pieces... When the piston goes up, fresh air is sucked into the crank case and when the piston is moving down, this air is compressed and eventually ports in the cylinder is opened the cylinder is filled with air. The excess oil in the crankcase were blown up to the combustion chamber.

Yes very cool under presure guys. The C02 is a good idea. I am not a mechanic but I keep several CO2 fire extiguishers around the diesel machinery where I work just in case I ever have tio snuff out an angine. Runaways and fires do happen but I have been lucky and never seen one.

It goes to show how well older engines were designed

@mikeys205 Yes it did. It changed direction 3 times before it got turning over TDC. Same thing, only once, when we got it running normally. When the engine rpm stabilizes, I change direction by shutting down fuel injection at 2:58 and at exactly the right moment, 3.03, I give a couple of manual injections.

@ElectronikHeart As on most two-stroke engines, the combustion air is fed thru the crankcase where the bottom side of the piston acts as an air pump. The crank splashes down into the lube oil and drops of oil follow the air into the combustion chamber.

Bro said "Im gonna run away" and entered Runaway state

best video ever here on utube

Ive honestly never seen an "angry" machine like this before. That thing cobbles around like its weighs nothing. Youve got nerves of steel operating that behemoth thumper.

This is just hillarious (as well as interesting). Bouncing around all over the place - and the guy uses and acetylene torch to heat it up to start it!

What a hero!

Crazy guys! I like them! ;)

nice rhythm!

Look at that old gizzer just puffing away.

Amazingk Engine!!

You're absolutly right. The one thing that prevented a disaster was that one air intake was blocked prior to start and the other intake was blocked when the rpm increased. If both intakes had been blocked 100% the engine would stop within seconds but we had some leaks...

i once had a kromhout 2 stroke in a small tugboat , it also ran away , in the middle of an busy canal , it ejected its smoke stack , old skipper told me later the flywheel will come off first , followed by the cyl head , flywheels of 2 tons will easily penetrate bulkheads , scared the shit out of me !!!

Got to be one of the best old engine start ups on youtube,proper "oh shit" looks on everyones face,well done lads,post more when you get her running well,A+++

Most of these engines should have a dry crankcase and they also have an automatic draining system but this one (as far as I remember, all RAP engines from this size and larger) need to have a certain oil level to insure crank bearing lubrication. Unfortunately, we added slightly too much oil...

When my friends came over to watch me start my Ford 427 for the first time I think this is what they were expecting/hoping to happen.

Well, runs silky smooth

He got balls of steel baby.

that is one violent engine :)

Who needs a ground packer, when you can just turn this big ol beast loose...

very brave men! !!!!!!

Yes, it is a kind og splash lube. A small amount of oil is fed to the crankcase and a pick up tube on the crank bearing is lubricating the bearing. Excess oil, usually in very small amounts, follows the combustion air and is burnt.

She is strong and beauty !!!!

What an animal !!! Love it !!!

Shit guys, glad you came out ok.

I see there's enough work in this world for me as a CE consultant.

@druszan17 No, it is a buffertank for start air. The acetylene tank is stored properly in the cradle at the right side of the engine.

We used about 6.5 bar/95 psi which is quite a bit on the low side. I believe the pressure should be about 12-14 bar/175-200 psi. Normally the start tank is filled by leaking a bit of the combustion pressure into the tank after the engine have started.

Gota love the old diesels

Хорошо ,что все живы и здоровы. Никого не намотало

@SveinHaDD I keep a Co2 fire extinguisher handy for runaways . Does not damage the engine just dsiplaces the O2 and snuffs them out.

woke up from eternal sleep just to choose violence.

@SveinHaDD Neat video! The engine had a pretty good sound towards the end of the video. It sounded sleepy at first, then woke up from a good nap :D

its on the move! haha love it!