"RamblinRover Luxury-Yacht" (ramblininexile) 08/27/2018 at 17:27 • Filed to: shitposting, Commer knocker

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user314 > RamblinRover Luxury-Yacht 08/27/2018 at 17:34

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What am I looking at, and why can’t I stop?

RamblinRover Luxury-Yacht > user314 08/27/2018 at 17:39

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Two-stroke diesel made for Rootes Group trucks in the ‘50s-’60s. Nicknamed a “Commer Knocker”.

Aremmes > RamblinRover Luxury-Yacht 08/27/2018 at 17:40

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Port overlap seems excessive, and it doesn’t seem easy to fix like Napier did.

HammerheadFistpunch > RamblinRover Luxury-Yacht 08/27/2018 at 17:41

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Needs more deltic

Tareim - V8 powered > RamblinRover Luxury-Yacht 08/27/2018 at 17:49

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sounds pretty bad ass for a diese l

Berang > RamblinRover Luxury-Yacht 08/27/2018 at 18:02

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Cé hé sin > user314 08/27/2018 at 18:02

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Commer TS3 aka Knocker. Two stroke opposed piston diesel.

Cé hé sin > Aremmes 08/27/2018 at 18:07

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The gif is actually wrong (as is the Deltic one) because in reality the pistons were out of phase.

Fixing could indeed be an issue because they tended to self destruct, something not understood at the time but it was actually due to the rocker arms that joined the upper and lower conrods being at an angle.

I like cars: Jim Spanfeller is one ugly motherfucker > RamblinRover Luxury-Yacht 08/27/2018 at 18:07

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Is the supercharger going the wrong way or are my eyes playing tricks?

AntiSpeed > RamblinRover Luxury-Yacht 08/27/2018 at 18:24

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That sounds awesome!

Cé hé sin > I like cars: Jim Spanfeller is one ugly motherfucker 08/27/2018 at 18:32

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We’ve discovered the hitherto little known supersucker.

But not really. The air goes around the outside, not through the middle.

LongbowMkII > HammerheadFistpunch 08/27/2018 at 18:40

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My big question is how to get three cranks into a useful output. Large gears (with others so they mesh)  to a central output shaft?

HammerheadFistpunch > LongbowMkII 08/27/2018 at 18:58

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yes, notice that one of the cranks is running backwards?

Distraxi's idea of perfection is a Jagroen > RamblinRover Luxury-Yacht 08/27/2018 at 19:34

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Is it bad that I look at this and think  the weirdest part is that they’re using the Rootes blower as a scavenge pump not a supercharger?

Aremmes > Cé hé sin 08/27/2018 at 20:29

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I wondered how they reconciliated the need to keep the pistons concentric with each other and the crank pin offsets. Thanks for the explanation.

Distraxi's idea of perfection is a Jagroen > Cé hé sin 08/27/2018 at 20:38

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Wow, I’ve double negatived myself into orbit .

Looked at animation. Thought “that supercharger’s going the w ro ng way”.

Thought about posting to that effect then decided I’d look up the Commer K nocker first

Saw Wikipedia article saying it’s a scavenge pump not a supercharger

Posted a comment to the effect of using a rootes blower as a scavenge p ump is the weirdest thing about this engine

See your comment and rea l ise you’re right: the animation is actually corre ct for a supercharger, which would make it wrong for the actual implementation

Wonder if W iki is wrong and finds that the interweb seems to be 50/50 on whether the Commer Knocker had a scavenge pump or a superc harger

...mind explodes

dogisbadob > RamblinRover Luxury-Yacht 08/27/2018 at 20:52

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I love these engine gifs

RamblinRover Luxury-Yacht > Distraxi's idea of perfection is a Jagroen 08/27/2018 at 23:56

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That’s what I thought at first too, but it actually isn’t. Air “scooped in ” around the outside, displaced on the pressure side as the lobes close.

Distraxi's idea of perfection is a Jagroen > RamblinRover Luxury-Yacht 08/28/2018 at 00:48

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https://oppositelock.kinja.com/1828641568

Cé hé sin > Distraxi's idea of perfection is a Jagroen 08/28/2018 at 04:47

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By “scavenge pump” they mean a blower. For reasons unknown to me you talk about " scavenging” a two stroke when you actually mean aspiration. So a petrol one uses crankcase scavenging.

Distraxi's idea of perfection is a Jagroen > Cé hé sin 08/28/2018 at 06:33

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Misapprehension on my part. For reason s lost to time , I’ve “always known” that a scavenge pump operates on the exhaust side to pull a vacuum , sucking exhaust and inlet a ir   through like a mechanical version of a tuned pipe exhaust, while a supercharger operates on the intake side, pressurising the charge . This turns out to be wrong...

TIL

RamblinRover Luxury-Yacht > Distraxi's idea of perfection is a Jagroen 08/28/2018 at 09:00

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It’s a scavenge pump! It’s a supercharger! It’s a scavenge pump and a supercharger!