Project of the Month built by mirek111

Help Support Home Model Engine Machinist by donating using the link above or becoming a Supporting Member.
Home Model Engine Machinist > Showing Them > Photos and Videos > Tiny I.C. Engine

Reply
 
Thread Tools
Old 10-19-2010, 02:36 AM   #221
gbritnell
Project of the Month Winner!!!
 
gbritnell's Avatar
 
Join Date: Jul 2007
Posts: 2,530
Liked 552 Times on 527 Posts

Default Re: Tiny I.C. Engine

Hi Kel,
The valves don't need to be hardened. If you did I'm afraid they would warp. The only way to have hardened valves is to leave them oversized, harden them and then grind but like I said it's not necessary.
George


__________________
Talent unshared is talent wasted.
gbritnell is offline  
 
Reply With Quote
Old 10-19-2010, 03:09 AM   #222
GailInNM
Administrator
HMEM_ADMIN.png
 
GailInNM's Avatar
 
Join Date: Feb 2008
Location: Albuquerque, NM, USA
Posts: 2,133
Liked 288 Times on 240 Posts
Likes Given: 112

Default Re: Tiny I.C. Engine

Arv,
My current spark plug is made with Corian at Georges suggestion. I will describe it in detail in a post a little later along with some photos. I made several changes, but to answer your immediate question the ground electrode is just like a standard automotive plug. It was machined on to the body blank as a straight protrusion and then bent over at assembly time. So it's just a matter of tweaking with a feeler gauge to set the gap.

Kel,
I have no visible wear on either the cam or cam follower. I used 12L14 steel for the cam and 2024 alum for the follower. The follower is polished a little bit, but the cam still shows machining marks because I did not polish it like I should have. The only wear on the engine that I know of is there is a little extra clearance on con rod big end. Con rod is 2024 alum and crankshaft is 12L14.

Gail in NM


__________________
Gail in New Mexico, USA
I would like to be the kind of person my dog thinks I am.
GailInNM is offline  
 
Reply With Quote
Old 10-19-2010, 03:49 AM   #223
kcmillin
Project of the Month Winner!!!
HMEM_SUPPORTER.png
 
Join Date: Jan 2010
Location: Bismarck, ND USA
Posts: 1,193
Liked 82 Times on 78 Posts

Default Re: Tiny I.C. Engine

Gail, Thanks for your answer.

I had the same problem with the connecting rod. I ran her hard a fast for a few tanks, cranked up the timing and held on! Well, needless to say the con rod journal was hashed. Instead of making a new connecting rod I drilled the hole a few thou oversize and then made a bronze bushing. I made it on the lathe then split it in one spot and stretched it over the con rod journal. The split's irregularities keep it in place by gripping on the aluminum connecting rod. Since then I have ran it without trouble and the con rod has no noticeable slop and runs freely.

I should note that I adjusted the torque on the con rod cap a little tighter each tank for a couple tanks until it seated properly enough to run free with the cap tightened all the way.

I should also note that I used a small side cutters to split the bushing, and did nothing further to it before installation. I am positive there is a better way.

Kel
__________________
Machinists do it with precision.

www.burleighmachine.com
kcmillin is offline  
 
Reply With Quote
Old 10-19-2010, 11:14 AM   #224
gbritnell
Project of the Month Winner!!!
 
gbritnell's Avatar
 
Join Date: Jul 2007
Posts: 2,530
Liked 552 Times on 527 Posts

Default Re: Tiny I.C. Engine

Hi Kel,
The next time you make a split bushing try this.
Take the 2 pieces of the material you are going to use (brass-bronze) and make rectangular strips out of them. Lightly tin one side of each with 50/50 solder. Flux them up and clamp them lightly together. Now heat with a small propane torch until you see the solder squeeze out from the sides. Let cool and clean up any extra solder.
Now put the bar in your 4 jaw chuck and get it on center. Turn the material to your bushing size and part off. Now just heat with the torch until it pops apart. Clean up the solder and mount the bearings. I put a small hole in one half so that I can put a pin in the cap to prevent it from spinning.
George
__________________
Talent unshared is talent wasted.
gbritnell is offline  
 
Reply With Quote
Old 10-19-2010, 01:34 PM   #225
kcmillin
Project of the Month Winner!!!
HMEM_SUPPORTER.png
 
Join Date: Jan 2010
Location: Bismarck, ND USA
Posts: 1,193
Liked 82 Times on 78 Posts

Default Re: Tiny I.C. Engine

George, WOW your brimming with good ideas. I like that method very much.

I should point out that the bushing I made was .005" thick. Would this be to delicate to solder and machine out? I could just make the bearing block hole bigger though.

THANKS!

Kel
__________________
Machinists do it with precision.

www.burleighmachine.com
kcmillin is offline  
 
Reply With Quote
Old 10-19-2010, 03:11 PM   #226
kcmillin
Project of the Month Winner!!!
HMEM_SUPPORTER.png
 
Join Date: Jan 2010
Location: Bismarck, ND USA
Posts: 1,193
Liked 82 Times on 78 Posts

Default Re: Tiny I.C. Engine

Since there has been experimentation with fuel for the Tiny I though why not propane.

Well, I just got the Tiny running on propane. Crudely I might add. I simply held the un-lit propane torch up to the carb and gave her a spin and she took off! I adjusted the speed by turning the knob on the torch. This should only be done outside because there is a lot of propane not getting into the engine. If a properly made LPG delivery system is made then the Tiny will indeed run on propane.

Just though I would add this.

Kel
__________________
Machinists do it with precision.

www.burleighmachine.com
kcmillin is offline  
 
Reply With Quote
Old 10-20-2010, 01:28 AM   #227
gbritnell
Project of the Month Winner!!!
 
gbritnell's Avatar
 
Join Date: Jul 2007
Posts: 2,530
Liked 552 Times on 527 Posts

Default Re: Tiny I.C. Engine

Hi Kel,
I don't think it would work at .005. The thinest wall I've made was about .025.
Well here's today's update. I finished the gears, cut the cam, made the cam follower, the rocker arm clevis and pushrod. It's getting close. I'm going to use a Hall sensor on it and I want to make it so I can adjust the timing a little so I'm going to pull up the Autocad and do a little design and layout. I think I'll make a little bracket that pivots on the crank and mount the Hall on this. The magnet will be mounted on a small disc outboard of the Hall sensor. I should be able to squeeze it in without much trouble.
George
Attached Thumbnails
TINY A.jpg   TINY B.jpg   TINY C.jpg   TINY D.jpg  
__________________
Talent unshared is talent wasted.
gbritnell is offline  
 
Reply With Quote
Old 10-20-2010, 01:29 AM   #228
gbritnell
Project of the Month Winner!!!
 
gbritnell's Avatar
 
Join Date: Jul 2007
Posts: 2,530
Liked 552 Times on 527 Posts

Default Re: Tiny I.C. Engine

Here's the last 2 pictures of today's set.
George
Attached Thumbnails
TINY E.jpg   TINY F.jpg  
__________________
Talent unshared is talent wasted.
gbritnell is offline  
 
Reply With Quote
Old 10-20-2010, 03:02 AM   #229
kustomkb
Project of the Month Winner!!!
 
kustomkb's Avatar
 
Join Date: Dec 2007
Posts: 1,180
Liked 63 Times on 59 Posts

Default Re: Tiny I.C. Engine


It's looking really nice George.

Can't wait to see it run. Thanks for your added design input as well.
__________________
-Kevin.

"No charge for the extra weight reduction Eh!"
My Photo's My Video's
kustomkb is offline  
 
Reply With Quote
Old 10-20-2010, 02:16 PM   #230
putputman
Senior Member
 
putputman's Avatar
 
Join Date: Nov 2008
Location: Brainerd, MN. USA
Posts: 600
Liked 100 Times on 89 Posts
Likes Given: 18

Default Re: Tiny I.C. Engine

Looks great George. You sure put out a lot of work in a short time.

I really like the way you radius all the edges. It gives it a finished look.


__________________
Regards
Arv
Brainerd, Minn. USA
******************
Think twice -- cut once ---- www.putputman.com
putputman is offline  
 
Reply With Quote
Reply


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Finished my version of Elmer's Tiny Engine TuxMan Finished Projects 8 08-17-2011 03:16 AM
My first Engine , frist Tiny and its a runner YAY! ewok Finished Projects 17 08-17-2011 03:04 AM
Teeny Tiny - My 3rd build Elmer's tiny at 1/2 scale 90LX_Notch Photos and Videos 19 03-29-2009 09:44 PM
Mighty yet tiny IC engine ! PTsideshow The Break Room 8 03-15-2009 10:19 PM
Elmer's Tiny - My 2nd Engine 90LX_Notch Photos and Videos 21 03-03-2009 03:16 AM



Newest Threads






- Top - Member List