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Author Topic: Economy Hit & Miss Engine  (Read 31968 times)

Offline zeeprogrammer

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Re: Economy Hit & Miss Engine
« Reply #105 on: March 23, 2017, 09:23:21 PM »
Looking better and better.  :ThumbsUp:
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Offline Nick_G

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Re: Economy Hit & Miss Engine
« Reply #106 on: March 25, 2017, 05:17:50 PM »
.
Cheers Zee.

Time to bore the hopper which will take the cylinder liner. This took quite a bit of head scratching and ummm-ing and arrrrr-ing of where to start as being a casting there was no true reference point. So after some deliberation I made some milling cuts that I could use as such. There are several axis with this part that have to be correct. - Some visual and some important from an engineering point. One of the visual ones is that the liner protrudes as true / central as possible through the taper at the back of the hopper.

No going back now after this first boring cut to accept the liner.



The tricky one was to reverse the casting and bore the face on the cylinder head end so that it lined up spot on with the bore at the rear. This was done with the ref cuts I had made, a lazer edge finder and my blessed DRO. - there is also a step in this hole to accept a flange on the liner.



I resisted the temptation to check a good alignment for the liner as while I had the DRO settings with the casting in that position I figured it would be a good time to do the PCD bolt holes for the cylinder head.





Happy days.!!  :) - If this had not worked out the cat would have had the kicking of it's life.  >:D  ;)







I still have to bore the liner out as it's just had a 38mm drill through it. It needs to be at 42mm with a good finish.

I can drink red wine and sleep contentedly tonight now.  :)

Nick
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Offline Walsheng

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Re: Economy Hit & Miss Engine
« Reply #107 on: March 25, 2017, 11:32:49 PM »
Looking very nice Nick.
Wondering what you are going to use to seal the liner to the hopper casting.

John
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Offline Dave Otto

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Re: Economy Hit & Miss Engine
« Reply #108 on: March 25, 2017, 11:40:55 PM »
Looks great Nick! nice work.

Dave
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Offline Nick_G

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Re: Economy Hit & Miss Engine
« Reply #109 on: March 30, 2017, 01:21:09 AM »
Quote from: Walsheng on March 25, 2017, 11:32:49 PM

Wondering what you are going to use to seal the liner to the hopper casting.

John

.
Probably a 'smidgen' of JB weld.  :ThumbsUp:

Piston.

The supplied aluminium was just long enough and was faced both ends.



This was then turned to diameter and grooves cut into it to accept the piston rings and a shallow groove to help small amounts of residual oil into the gudgeon pin. (think the Americans call this a wrist pin)



Taper into the piston skirt.



Then over to the mill to recess a pocket to take the little end of the conrod.



Then the chucking area was removed in the lathe and to the correct piston length.



Now I have this.



Still need to put some oil holes through to the bearings and make some caps from PB or brass to cover the gudgeon pin ends so that it will not damage the cylinder bore.

Nick
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Offline Flyboy Jim

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Re: Economy Hit & Miss Engine
« Reply #110 on: March 30, 2017, 03:29:40 AM »
Very impressive Nick!  :ThumbsUp:

Jim
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Offline 10KPete

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Re: Economy Hit & Miss Engine
« Reply #111 on: March 30, 2017, 05:44:40 AM »
Nick, rather than epoxy the liner/hopper joint I think you would be happier, longer, with an o-ring. A 1/16 section o-ring groove will fit nicely in the wall of the liner. Put one at the head end also....

Looking good!!

Pete
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Offline Walsheng

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Re: Economy Hit & Miss Engine
« Reply #112 on: March 30, 2017, 12:21:20 PM »
Quote from: 10KPete on March 30, 2017, 05:44:40 AM
Nick, rather than epoxy the liner/hopper joint I think you would be happier, longer, with an o-ring. A 1/16 section o-ring groove will fit nicely in the wall of the liner. Put one at the head end also....

Looking good!!

Pete

That's interesting.  I have seen others use RTV but I like the idea of being able to disassemble if needed.  Maybe Viton o-rings?

And Nick, that is looking nice and I bet it will make some big pops (and lots of ice cream to go along with mint chocolate chip cookies!)

John
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Offline Tennessee Whiskey

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Re: Economy Hit & Miss Engine
« Reply #113 on: March 30, 2017, 07:06:23 PM »
A simply beautiful con rod and piston.  :ThumbsUp: :ThumbsUp: Nick.

Eric
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Offline Nick_G

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Re: Economy Hit & Miss Engine
« Reply #114 on: March 31, 2017, 05:46:16 PM »
Quote from: 10KPete on March 30, 2017, 05:44:40 AM
Nick, rather than epoxy the liner/hopper joint I think you would be happier, longer, with an o-ring. A 1/16 section o-ring groove will fit nicely in the wall of the liner. Put one at the head end also....

Looking good!!

Pete

.
Hi Pete.

Too late. .............. It's in.  :-X

Regards and thanks to everyone,  Nick
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Offline Roger B

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Re: Economy Hit & Miss Engine
« Reply #115 on: March 31, 2017, 08:09:40 PM »
Looking good  :ThumbsUp:  :ThumbsUp:  :wine1:
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Best regards

Roger

Offline Nick_G

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Re: Economy Hit & Miss Engine
« Reply #116 on: April 02, 2017, 12:50:23 PM »
.

Checked the alignment of the bore to crankshaft before I go much deeper. This is one of the few critical things on such an 'agricultural' engine as this. But quite a few factors effect it's alignment.





It was thankfully in the 'adjustment zone'  ;) of the fixing holes.

Quick video. - The slight knocking is that the flywheel has not got a properly sized key in it as yet. ......... Honest.!  ;D

<a href="https://www.youtube.com/watch?v=zVOa7gwUN1U" target="_blank">http://www.youtube.com/watch?v=zVOa7gwUN1U</a>

Nick
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Offline Gas_mantle

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Re: Economy Hit & Miss Engine
« Reply #117 on: April 02, 2017, 01:01:50 PM »
Looking great so far.

I can't wait so see it in action once it is complete  :)
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Online Kim

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Re: Economy Hit & Miss Engine
« Reply #118 on: April 02, 2017, 03:15:18 PM »
I've been quietly following along with your progress and it looks great Nick!
Kim
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Offline scc

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Re: Economy Hit & Miss Engine
« Reply #119 on: April 02, 2017, 05:31:09 PM »
Nice engine Nick,  I'm enjoying progress with this  :ThumbsUp:one          Terry
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