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View Full Version : Finished the Economy Hit and Miss Model Engine



japcas
01-01-2011, 01:57 PM
Some of you guys may remember a couple of months back when I posted my Economy hit and miss model engine that I had been building. It was without paint but running. Well, I finally got the paint finished and got it back together.

It has a a 1.125 diamter bore and a 1.75 inch stroke. The flywheels are approximately 6.5 inches in diameter. I made the crankshaft from a solid piece of 4140 barstock. No worries about it coming apart. It has a 2 ounce fuel tank in the base and will run for several hours on that amount of fuel. I use coleman fuel in it. I'm including some pictures and a YouTube video of it running. Enjoy.

http://www.youtube.com/v/JDQmR6TngEU?fs=1&amp

http://i32.photobucket.com/albums/d39/japcas/IMG_2166.jpg

http://i32.photobucket.com/albums/d39/japcas/IMG_2168.jpg

http://i32.photobucket.com/albums/d39/japcas/IMG_2169.jpg

garagemark
01-01-2011, 02:00 PM
Wow! Good looking piece man. I am immmmpressed!

Peter.
01-01-2011, 02:04 PM
That is a nice looking engine - you must be very proud :)

Toolguy
01-01-2011, 02:17 PM
Great piece of work! Thanks for the video! It's amazing the degree of control on that engine throttling it up and down. Very well done, both mechanical and visual.

wierdscience
01-01-2011, 03:09 PM
Very nice job,that start off as a casting kit or is it a scatch build?

brian Rupnow
01-01-2011, 03:16 PM
Very nice build. You must be very proud.---Brian

japcas
01-01-2011, 03:35 PM
Very nice job,that start off as a casting kit or is it a scatch build?

Thanks for all the kind comments. This engine started out as a very rough set of castings. I have about 7 other casting kits that I have been collecting and this one is definitely the roughest one of all of them. I figured if I could get this one to look decent, I should be able to make the others look good. The cylinder head casting wasn't even usable so I built one up from brass stock. All of the castings were aluminum with the exception of the flywheels. Here are some pictures from when I got it.

It was a fun project. These engine casting kits provide for lots of challenges to test your machining and setup skills.


http://i32.photobucket.com/albums/d39/japcas/DSC_5798.jpg
http://i32.photobucket.com/albums/d39/japcas/DSC_5800.jpg
http://i32.photobucket.com/albums/d39/japcas/DSC_5803.jpg
http://i32.photobucket.com/albums/d39/japcas/DSC_5802.jpg

japcas
01-01-2011, 03:40 PM
Who would have thought there would be a crankshaft hiding in this piece of 4140?

http://i32.photobucket.com/albums/d39/japcas/DSC_6201.jpg

http://i32.photobucket.com/albums/d39/japcas/DSC_6239.jpg

mike os
01-01-2011, 03:45 PM
nice job:)

duckman
01-01-2011, 04:02 PM
Nice job but my 9yo grand daughter wants to know why it keeps farting when i stopped laughing I told her I would ask :rolleyes: even though I knew.

sasquatch
01-01-2011, 05:54 PM
Very nice, great Project!!!!!!!!!!!!!!!!!!!

Liger Zero
01-01-2011, 06:01 PM
Nice job but my 9yo grand daughter wants to know why it keeps farting when i stopped laughing I told her I would ask :rolleyes: even though I knew.

Ok so I wasn't the only one giggling at the fart-engine :o

*fart* WHIIIIIRRRR *fart*WHIIIIIRRRR *fart*WHIIIIIRRRR *fart* :D


What is providing the ignition? Is it just compression or is there a tiny dynamo and spark-plug involved somewhere?

japcas
01-01-2011, 06:23 PM
What is providing the ignition? Is it just compression or is there a tiny dynamo and spark-plug involved somewhere?

Liger, in the first picture the spark plug is under the clear boot on the side of the cylinder. Just follow the black plug wire coming out of the wooden base up to the side of the engine. The ignition is under the red base of the engine with the fuel tank and runs on 4 AA batteries. I am using a Hall Effect sensor under the cam gear to trigger the ignition, no points at all.

Black_Moons
01-01-2011, 06:36 PM
I wonder what kinda fuel efficency a hit and miss gets compaired to a traditional throttle arrangement. Likey a lot easyer to tune...

Liger Zero
01-01-2011, 07:29 PM
Liger, in the first picture the spark plug is under the clear boot on the side of the cylinder. Just follow the black plug wire coming out of the wooden base up to the side of the engine. The ignition is under the red base of the engine with the fuel tank and runs on 4 AA batteries. I am using a Hall Effect sensor under the cam gear to trigger the ignition, no points at all.


Ok I see it now. Thank you.

lane
01-01-2011, 08:40 PM
Might I ask who makes ans sales the kit. I have built lots of engines but do not have one of those and they are quite common in real life at engine shows .So a model should be nice to add to my collection . Could supply a address and name.

Ken_Shea
01-01-2011, 09:05 PM
That was a treat to watch, my first YouTube video watched in 2011, was great! :)

japcas
01-01-2011, 11:09 PM
Might I ask who makes ans sales the kit. I have built lots of engines but do not have one of those and they are quite common in real life at engine shows .So a model should be nice to add to my collection . Could supply a address and name.

Lane, these castings came from Joe Tochtrop in San Francisco, CA. As far as I know he still sells them too. He doesn't do email, but you can call him and talk with him if you want. To order you have to send him a check in the mail and he will send the castings right out. I'm attaching a link that has his phone number and address for you. It's in the lower right corner of the page.

He also sells several other kits including a vertical pump jack. I'd give him a call to get the latest prices and find out what's available.