K & B .23 Engine

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K & B .23 Engine

Postby WaltEagles24 » Thu Jul 16, 2009 12:51 pm

I recently bought a C/L K&B .23 engine which among other problems has the head from a .19 engine on it. This can't be right can it?
The crancase definately has a 23 on the side so I was wondering if they used the crank from the .29 in the .19 engine to get a .23. Any help out there?

Walt
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Postby walt » Fri Jul 17, 2009 8:15 am

A parts list from the old K&B line might show you which parts were interchangable.
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Postby walt » Fri Jul 17, 2009 8:23 am

Hmmmm, I found an unofficial list of parts and it shows the 19 and 23 used the same crankshaft and connecting rod but different piston and cylinder assemblies and different heads.
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Postby walt » Fri Jul 17, 2009 8:26 am

The 29 and 32 show using the same crankshaft and connecting rod also. They're NOT the same ones used on the 19 and 23.
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K & B .23

Postby WaltEagles24 » Fri Jul 17, 2009 1:22 pm

OK so it sounds like the head is from the .19 engine, the crankshaft is either for the .19 or .23 (can't determine at this point), and the cylinder is unknown also. Please note that I only paid .99 cents for this mess so no big loss if it becomes a parts engine but I like a challenge.
After I cleaned it up and put new gaskets on it I tried it to see what kind of compression I had, which was none. The piston had a lot of slop in it which makes me wonder if the piston was originally from a .19 and the cylinder from a .23. Without specs on the dimentions of piston, cylinder, and crank there is no way to tell what the parts belong to what engine.
Anyone out there know where I can get the specs?
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Postby USMC » Fri Jul 17, 2009 3:43 pm

Take a look of this pic, is that the same .19 piston & sleeve as yours?
if yes, I will check the size of both for you.

http://www.rcgroups.com/forums/showthread.php?t=1038960

Take Care,
USMC & Viking...! & Little Jack...! :)
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Postby USMC » Fri Jul 17, 2009 4:18 pm

Piston, OD .634
sleeve,OD .749
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Postby walt » Fri Jul 17, 2009 5:32 pm

I think the K&B Torp 23 has the cylinder and cylinder fins as a single, intergral unit. Not a separate sleeve as in the later K&B Veco 19.

Also, if you have a 19 head on a 23 cylinder, you may lose compression there.
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Postby WaltEagles24 » Fri Jul 17, 2009 6:38 pm

Thats right there is no sleeve, the cylinder and fins are one. Also the crankcase for the .19 rear cover bolt pattern matches the .23 exactly so just guessing I would say that the crankshafts between the two would be interchangeable.
So this .23 crankcase has a .19 head on it and its reasonable to assume that the cylinder sleeve and piston would be .19 also. How would that work if at all.
If the crankshaft is identical for both the .19 & .23 and the only real difference between the two is piston/cylinder diameter than, what I really have is a .19. Right or Wrong?
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K & B 23 Engine

Postby Ken McClenahan » Fri Jul 17, 2009 8:03 pm

I have the ILs for 1954 and 1955. Anyone who wants a copy send an E-mail to klmcclen@comcast.net .

The cranksaft and connecting rod are the same for the 19 and the 23. The cylinder/piston set and the heads are different but a 19 head should work in a 23.
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.23 torpedo

Postby WaltEagles24 » Sat Jul 18, 2009 1:52 pm

Wow! great stuff Ken. Well based on what you have sent me I now know I need a K&B Torpedo .23 Piston,Cylinder, & head to make this engine whole again.

Here's another question for the more experienced out there. Why is it when I put an engine in the test stand and try to fire it up it runs great until the second I remove the glow plug starter? Now were are not talking about a engine burst but a run time long enough to allow the adjusting of the fuel to get a nice steady RPM and that pitch you look for when you don't have a tach. I've had this happen on several engines now and can't seem to ID the problem.
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Postby chiefss » Sat Jul 18, 2009 8:59 pm

One of three reasons. The fuel needs more nitro, the plug is bad or not hot enough, and, Damn, I forgot what three is. Oh yeah, the fuel may be contaminated.
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Postby WaltEagles24 » Sun Jul 19, 2009 9:18 pm

Hey Thanks Chief. That would explain why it. Whilse the plug is hot, and the fuel is freshbut it is only 10% nitro so I'll try a higher percentage and see what I get.
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Postby chiefss » Mon Jul 20, 2009 11:26 am

Remember this, just because a plug glows doesn't mean it's any good.
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Postby WaltEagles24 » Mon Jul 20, 2009 12:35 pm

So what are you saying? Is there something to look for other than a bright red glow? I tried 3 plugs the last one, a hot long, out of the package and got the same results. I was really stumped why some engines would run and others wouldn't but you have given me the info I was missing. When I go back to the hobby shop I pick up some 15% nitro. How about the little Cox engines do they like the higher nitro fuel or what?
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Postby chiefss » Mon Jul 20, 2009 1:35 pm

Little engines give off their heat very quickly and like high nitro fuel. Cox blue can was 25% and Cox red can was 35% nitro. K&B1000 was 25% nitro. The little ones love this stuff.
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Postby WaltEagles24 » Mon Jul 20, 2009 2:33 pm

It sounds like I'd better scout out trhe hobby shops in the area and see if I can locate some higher nitro fuels. Thanks for the great info which is what I always get from people on these boards

Walt
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