Rap 24 hp semidiesel, first start attempt in 20 years.

[EEguy85]

ya blew it.

[jack9102]

wow it reversed 37 times? nice engine :D

[dx80cruiser]

So boring, nothing actually happens

[schlusselmensch]

Some time ago you mentioned that the oil level in the crankcase was too high, causing the engine to run away. There is little information on Rapps here in North America, how is the combustion chamber isolated from the lubricating supply when the level is normal? It must be quite different from many 2 stroke hot bulb engines that almost universally had a scavenging pump or valve to evacuate excess oil from the crankcase. Any other Rapp experts know the answer?

[SveinHaDD]

@schlusselmensch There are a few different variations of the crank bearing lubrication on the different brands of semi-diesel engines. Some have direct lubrication of the crank bearing and the surplus in the sump blow back to the lubricating device. In Rap, oil is added in the crankcase and the level must be so high that a capture tube is picking up oil to the crank bearing. Excess oil follow the flushing air and is burned. This will normally hardly be noticed under normal operating conditions.

[schlusselmensch]

@SveinHaDD I see, so if the oil level is too high, the rod assembly will throw up enough that the engine will run on it instead of just injection oil? This capture tube supplies the main bearings or is it for the crankshaft big end bearing?

[SveinHaDD]

@schlusselmensch Yes. The capture tube supplies oil to the connecting rod bearing only. There are two channels on the lubricating device to supply oil to each main bearing. The excess oil from these bearings and also cylinder lubrication all ends up in the crankcase and will sooner or later be burnt, a drop or two every now and then...

[marcvie9]

For what is or was this engine used for please awnser i really like to know!

[SveinHaDD]

@marcvie9 These kind of engines were widely used for ship propulsion for many decades in the last century.

[MikeAdorff]

I am NOT an expert:

Could you please explain: What does that mean: low capacity in start air hos

Is it started my compressed air?

[SveinHaDD]

@MikeAdorff To get the engine turning, first the flywheel need to be set in a position where the piston is slightly past top dead centre (when the piston is at the highest point). Then compressed air is fed thru the startvalve into the cylinder pushing the piston down. To get the flywheel spinning as fast as possible, there have to be enough air at a high enough pressure. In this case, the pressure is too low. Normal start air pressure would be something like 12-30 bar.

[ak7wyf]

warning people engine never starts. go spend time with yer families instead of watching bullshit vids.

[mrspenn1611]

@ak7wyf thanks, I zipped it forward and, yep you are right.

[Ghstwn]

Why didn't these idiots just edit out the first 8 minutes of failure???

[SveinHaDD]

@Ghstwn Because there will always be some idiots watching it and make stupid comments :-(

[gonetoworkbbackin5mi]

@Ghstwn Because it is part of the struggle to get it running, girly-man. People like you who can't do anything wouldn't understand.

[scott93257]

Tie Obama to that pulley and give him a good spin

[NathansBackwoods]

0:34, push it over with your foot, Then oops his and slips and the thing fires!! BOOMMM!!! next thing you know is that your leg is busted to pieces and your at Commercial airline altitude..that would suck.

[scott93257]

@NathansBackwoods

LOL yep that would be the way of it for sure.

[valve0radio]

Wow 8:25 it couldn't quite fire over top centre. These 2 strokes can run either direction and can be bounced backward as the starting procedure where less effort is needed than full revolutions. Yes this one is air start with manual timing. A 'tractor-start' may have tipped it over before it would revolve? What a GIANT SINGLE 2 STROKE! Amazing.

[sideshow45]

was the flywheel even making full rotations when it was running? it looked like it just went clockwise, counter clockwise, clockwise, etc...

[thewelford]

Obamacare

[yamahonkawazuki]

@thewelford If that were teh case it would have been extremely taxing lol

[gardnerbm]

are they using an air compressor to start it?

[fabio4756]

cool

[robinhooodvsyou]

That would make an awesome cabbage cannon !

[scott93257]

@robinhooodvsyou

Ohhh man would it ever!!!

[kazimann]

Animal of a machine!

[CBMXX]

was a difficult operation

[Mackiebrat]

chain the old grrl down good too......please becareful....

[Mackiebrat]

Reheat the glow plug after 3-4 min ,smiles . and yes I agree on first start after 20 yrs ...hook a tractor belt to it . get rings loosened ....oil all in strange places and then she'll kick on first air hit. (Me thinks there is a pride thing going here ,like i'm gonna start this thing ,especially with a camera on me or die trying ,lol ) ...been there done that..lollllllllll

[coolestjagman]

Looks like too much priming is the problem apart from low volume of starting air !!

[minedronebiznis]

not on something like that!!!

[BlakeMason2]

Frustrating! Interesting engine though.

[jayurish]

It has a belt pully.. I would have just got a tractor with a pully and belted it...

[Ghstwn]

@jayurish And of course everyone has a tractor and a belt drive available to them. You were so smart two years ago. Wow!

[applecounty]

Do you know the history of this gem?

[TugPoseidon]

Storartet Svein!!

Jeg venter spent på fortsettelsen!

Godt nytt år forresten :-)