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11
Vehicles & Models / Re: a newbie's take on the A3 switcher
« Last post by Mike R on March 27, 2024, 09:19:47 PM »
Agree with Kim, a little oil and the truck should be fine.  They should free up with some running. 

Mike
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Your Own Design / Re: Mercedes-Benz W165 Grand Prix engine in 1:3 scale
« Last post by Vixen on March 27, 2024, 07:04:51 PM »
Hello Chris,

Sorry, I forgot to give the gear dimensions in the earlier post. I believe the pump I used is from a 50cc Honda Cub engine, the outside diameter of the ring gear is 23mm and it's 3.2mm thick. I have another similar looking Honda Cub pump in the box, it measures 23mm diameter and is 5.5mm thick; almost double the capacity. I guess that it comes from one of the larger engines.

Quote: "The Honda Cub is a motorcycle with a four-stroke single-cylinder engine ranging in displacement from 49 to 124 cc (3.0 to 7.6 cu in). It has been in continuous manufacture since 1958 with production surpassing 100 million in 2017. making it the most produced motor vehicle in history."

Honda tend to get things right.

Mike
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Your Own Design / Re: Kearsarge Windlass Engines
« Last post by cnr6400 on March 27, 2024, 06:56:57 PM »
 :ThumbsUp: :ThumbsUp: :ThumbsUp: :popcorn: :popcorn: :popcorn: Hope the shop elves don't cut themselves getting in to and out of those new hot tubs.  :facepalm: Doh! I keep forgetting they read this chat!  :Lol:
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From Plans / Re: 30ft 1890's navy steam launch 1/6th scale
« Last post by cnr6400 on March 27, 2024, 06:53:38 PM »
 :ThumbsUp: :ThumbsUp: :ThumbsUp: :popcorn: :popcorn: :popcorn: Great looking pipe joint! Not surprised Slim didn't have a bone to pick with you about it. :Lol:
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Your Own Design / Re: Mercedes-Benz W165 Grand Prix engine in 1:3 scale
« Last post by cnr6400 on March 27, 2024, 06:51:36 PM »
 :ThumbsUp: :ThumbsUp: :ThumbsUp: :popcorn: :popcorn: :popcorn: Great work Mike!
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Your Own Design / Re: Building a twin cylinder inline i.c. engine
« Last post by Brian Rupnow on March 27, 2024, 06:12:21 PM »
Right now, I'm kind of lost in the forest. The fuel/carburation side of this engine seems to be okay. I have played with the ignition timing a bit and got back to where the engine is firing some of the time while being rotated. The easiest thing to try is a different fuel, so I will try some automotive gasoline in the tank to see if that makes any difference.  I could take out one piston and con rod and try to get it running as a single cylinder engine. That requires a considerable amount of work and I'm not sure I want to go there yet.
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Your Own Design / Re: Mercedes-Benz W165 Grand Prix engine in 1:3 scale
« Last post by Laurentic on March 27, 2024, 06:11:29 PM »
Thanks for the info Mike.  My car may well have one installed without me knowing it, but the days when I delveved into car engines are long gone! Today's car are far too complex, need a computer to do anything, far too many wires coming out of them, and I'm now far too big to get anywhere near them even if I wanted to!

The whole pump lookes very nice by the way.  What would be the diameter of those gears?

Chris
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From Plans / Re: 30ft 1890's navy steam launch 1/6th scale
« Last post by tghs on March 27, 2024, 05:20:03 PM »
soldered up the main connection in the header pipe, if this one wasn't correct, the rest would have been a waste of time, I think it has passed Slims inspection!!! now to add the other parts, clean it up and try my hand at home copper plating to hide the solder joints..  :cheers:
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Your Own Design / Re: Mercedes-Benz W165 Grand Prix engine in 1:3 scale
« Last post by Vixen on March 27, 2024, 04:39:59 PM »
Thanks for calling in guys, and to everyone else who took the time to look in.

Chris.  These days, the internal gear pump configuration is also widely used in automobile engines as well as bike engines. It is also sometimes called a rotor or gerotor pump. They are very robust and can be expected to outlast the life of a car engine without ever seeing the light of day. You may have one in your own car engine without realising it!!

The rear face of the pump is completely flat, except for the two inlet/outlet port drillings; somehow that stage escaped the camera. The outer cover blank was then attached to a sacrificial plate on the mill to machine the external features in stages. These include the outer profile, base flange, the two protruding bosses for the hose connections and the mounting face for the fuel pump.











A little handwork with a file rounded the edges of the machined work to make it look more like a casting. Then the hose connection holes were drilled and tapped to intercept the inlet outlet ports previously drilled from the front face. Finally, the parts were given a quick visit to the bead blast cabinet to improve their cosmetic appearance.








The scavenge pump gets installed and connected up to the supercharger pipework in the next installment from Vixen's Den.

Stay tuned

Mike



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Your Own Design / Re: Building a twin cylinder inline i.c. engine
« Last post by Jasonb on March 27, 2024, 04:31:22 PM »
Flame is a good way to see if you are sucking in and exhausting fuel/air mix. it will also give an indication of what your mixture is like, big orange flame and it is too rich, you want a quick burst of blue flame.

I still feel the take one plug out and see how the engine bounces, then repeat for the second cylinder is a better way of checking seal and compression at the point of rotation that you need it rather than blowing up low pressure ballons
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