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RC Dishes Pistons
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AaronSEIA View Drop Down
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Joined: 11 Sep 2009
Location: Mt Pleasant, IA
Points: 2551 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AaronSEIA Quote  Post ReplyReply Direct Link To This Post Topic: RC Dishes Pistons
    Posted: 01 Feb 2023 at 6:42pm
Had to pull the head on my boys RC to diagnose a stuck valve.  Was surprised to find dishes pistons.  They are flat around the edge for maybe 1/4", then have a dish in them.  Not shaped at all like an M&W or Power Crater piston.  Any idea who's aftermarket piston they are and what the compression might be?
AaronSEIA
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PaulB View Drop Down
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Joined: 12 Sep 2009
Location: Rocky Ridge Md
Points: 4722 		Post Options Post Options   Thanks (0) Thanks(0)   Quote PaulB Quote  Post ReplyReply Direct Link To This Post Posted: 01 Feb 2023 at 7:35pm
Those are the pistons that would have been installed for a kerosene engine at the Allis factory. Are they Iron pistons? Many of the earliest pistons were iron, not aluminum. The C/R would most likely be 4.71:1 or 4.75:1.
If it was fun to pull in LOW gear, I could have a John Deere.
Real pullers don't have speed limits.
If you can't make it GO... make it SHINY
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AaronSEIA View Drop Down
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Joined: 11 Sep 2009
Location: Mt Pleasant, IA
Points: 2551 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AaronSEIA Quote  Post ReplyReply Direct Link To This Post Posted: 03 Feb 2023 at 5:51am
Pistons are magnetic.  Block is an RC block with a G code.  Shifter is completely wore out but the sleeves have almost no ring lip at the top.
AaronSEIA
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 20479 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 03 Feb 2023 at 5:54am
So, it's probably been overhauled once ?? It would be interesting to run a compression test on it. Might have been engineers first attempt at Power Crater piston bowl design, except not with a flat cylinder head.
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PaulB View Drop Down
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Joined: 12 Sep 2009
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Points: 4722 		Post Options Post Options   Thanks (1) Thanks(1)   Quote PaulB Quote  Post ReplyReply Direct Link To This Post Posted: 03 Feb 2023 at 6:42am
Compression on a BE/CE engine with dished pistons would be very low. To even get a reasonable 90-100 PSI requires the piston to be flat, because of the chamber in the head and come up to (or very near) the top of the sleeve at TDC. Not an attempt at Power-Crater pistons like used in the 20l-226 engines without a chambered head. 
  Better compression in a BE/CE engine requires domed piston or more stroke as was designed into the replacement for the BE/CE which was the 138/149/160 which has a flat, non chambered head.  
  Most likely with the "G" suffix suffix on the engine it was a low budget overhaul with used parts, or possibly something that dealer wanted to get rid of cheap. A kerosene engine (that would have left the factory with dished pistons) would have a "K" suffix. 


Edited by PaulB - 03 Feb 2023 at 6:53am
If it was fun to pull in LOW gear, I could have a John Deere.
Real pullers don't have speed limits.
If you can't make it GO... make it SHINY
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