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Old 04-15-2010, 07:17 AM   #1
maskell
 
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Default 1/4 Scale IHC Famous 3hp

Hello Everyone, I have just started a build on a 1/4 scale IHC Famous water cooled hit and miss engine.
The pic here is of the cylinder so far and as I have spare engines I will strip a full size engine and restore it as I go, thats where the large cylinder came from. The square is what I made the cylinder from.
I machined the outer and have bored the cylinder oversize in the centre and fitted a sleeve made from a Zetor tractor clutch slave cylinder and that leaves 0.100" water jacket outside the sleeve. The cylinder had a stainless sleeve in it so I hope to open it up a little as I go.
Sorry I didnt have the foresight to take pics earlier but I will try not to let it happen again.
What is the general opinion of the material I should use for piston rings and piston with the stainless bore?

Thanks Lance



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Old 04-15-2010, 08:00 AM   #2
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Default Re: 1/4 Scale IHC Famous 3hp

I'll be following this one with interest, It looks like I will be making one of the Blackberry Models kits for someone later in the year, its a 1/5th scale 3HP, what HP is yours based on?

If the bore was left untouched you may get away with Vitron O rings but if taking it out it may be better to use iron rings.

Jason



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Old 04-15-2010, 10:24 AM   #3
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Default Re: 1/4 Scale IHC Famous 3hp

Lance stainless likely not a good choice for a cylinder bore. galling. Lance you said in your post you repair and restore antuque as well as modern diesels for a living . Why not just use the materials found in the full sized ones.
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Old 04-15-2010, 12:15 PM   #4
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Default Re: 1/4 Scale IHC Famous 3hp

The following thread has a table that gives data regarding suitable wear pairs and shows stainless steel against iron as an excellent combination. Thats why I suggested iron rings if you overbore, they will also last better against a likely rougher surface that you are likely to get.

http://www.homemodelenginemachinist.com/index.php?topic=7342.0

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Old 04-15-2010, 08:51 PM   #5
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Default Re: 1/4 Scale IHC Famous 3hp

Jason, It is a 3hp, I have some cast here so I will make the piston from it, I was thinking of casting one from a John Deere or IHC 414 piston as they seem to cast well and would wear ok too. I have made cast piston rings before so I will look at that also.

Lance

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Old 04-17-2010, 04:40 AM   #6
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Default Re: 1/4 Scale IHC Famous 3hp

Had a quiet day at work today so I went down the back and had a fiddle with the famous.
The engine is fired by an ignitor so the next thing to do was the ignitor trip roller bracket so not having a mill yet I cleaned up some flat bored a hole in it to 1.960 and set the plate up sideways and counterbored the plate to 3/16 and 0.90 deep.
I had to improvise to get it the 0.90 so the last pic is how I improvised with gasket paper under the vise grips.

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Old 04-17-2010, 04:45 AM   #7
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Default Re: 1/4 Scale IHC Famous 3hp

Machined out the flange and silver soldered the flange to the cylinder.
Started on the cylinder head and made up a scriber out of an old injector nozzle needle to mark out the 90deg spacings for the head

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Old 04-17-2010, 05:00 AM   #8
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Default Re: 1/4 Scale IHC Famous 3hp

I have included a pic of using the scriber set up and the way I rotated the chuck with an 8'' shifter tight on one jaw until it touched the bed and scribed a line and turned 90deg and repeated. I did the full rotation to check accuracy and it was the thickness of the scribe line off but I dealt with that easily.
Pic 54 The scriber at work down the sides.
Pic 55 Drilling the holes for the head studs, water outlet and valve guides in the drill press after truing it up (again)
Pic 56 The head so far with the valve guide holes, the ignitor hole, exhaust port drilled and tapped to 1/4NPT. The inlet has not been finished because it has a pilot drill broken in it at present (the reason for walking away and writing this up) and the 2 holes in the raised centre will have the valve seats machined into them.
That might have to do for today, time for a beer.
Lance

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Old 04-17-2010, 05:00 AM   #9
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Default Re: 1/4 Scale IHC Famous 3hp

Is this the full scale engine?

http://sites.google.com/site/ihcfamous/

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Old 04-17-2010, 05:12 AM   #10
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Default Re: 1/4 Scale IHC Famous 3hp

Hello Twmaster, Yes looks to be the same as the one I'm playing with, I have 3 of the real ones, 1 done up for show and the rest
are waiting for their turn.

Lance



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