Antique Engines and Old Iron
[Home] - [HELP] - [Forums] - [Groups] - [Classified Ads] - [Subscribe] - [Books] - [Sponsors] -

Go Back   SmokStak > SmokStak® Antique Engine Community > Scale Model Engineering
Forgot Password? Join Us!

Notices

Scale Model Engineering Steam, gas and hot air model engines, tractors, trains and accessories. Machining and milling castings.

Scale Model Engineering

Model Stroke v/s piston dia.


this thread has 6 replies and has been viewed 1448 times

Reply
 
Thread Tools Display Modes
  #1  
Old 01-15-2015, 11:58:39 PM
GarysToys GarysToys is offline
Registered
 
Join Date: Nov 2004
Location: Manheim, Pennsylvania, USA
Posts: 1,594
Thanks: 758
Thanked 2,686 Times in 526 Posts
Default Model Stroke v/s piston dia.

I just picked up a small Craftsman 109 metal lathe and a milling table and vice for a drill press. I want to start building some small model engines.

I want to start with a flame licker type. Is there any formula for the diameter of the piston, versus the stroke for these engines. Also, how do you size the flywheel and it's weight?

Also most of the models I have seen are made from aluminum. I have a lot of steel and cast iron around that I would like to use. Is there any reason I can't use these materials for the piston and cylinders.

Any help would be appreciated.
Reply With Quote
Sponsored Links
  #2  
Old 01-16-2015, 12:08:58 AM
Capt...John Capt...John is offline
Registered
 
Join Date: Aug 2013
Location: Hesperia, Michigan
Posts: 270
Thanks: 224
Thanked 75 Times in 43 Posts
Default Re: Model Stroke v/s piston dia.

Cast iron pipe works good for a sleeve. Steel for crankshafts. What size of engines are you building?
Reply With Quote
The Following User Says Thank You to Capt...John For This Post:
  #3  
Old 01-16-2015, 12:35:52 PM
Jamesk815 Jamesk815 is offline
In Memory Of
 
Join Date: Jan 2007
Location: Sandwich, Illinois
Posts: 1,181
Thanks: 4,494
Thanked 2,045 Times in 662 Posts
Smile Re: Model Stroke v/s piston dia.

You want to have a little weight to your flywheels . There are several places where you can get plans, for these engines, they are advertised even on this site . That well give you a good idea where to start. Just remember when building one, that friction is your worst enemy. Your not going to be able to do much milling on the drill press either.

Last edited by Jamesk815; 01-16-2015 at 04:40:15 PM.
Reply With Quote
  #4  
Old 01-16-2015, 01:24:23 PM
Andrew Mackey Andrew Mackey is offline
Moderator
 
Join Date: Nov 2004
Location: Rockaway, New Jersey USA
Posts: 14,208
Thanks: 1,996
Thanked 6,819 Times in 4,329 Posts
Default Re: Model Stroke v/s piston dia.

Turn of the century it was common to see bore x 2 equaled stroke on a 4 cycle engine. Later engines brought it dowm to 11/2 to one ratio. Most modern engines are about 1 to 1 bore to stroke.
Reply With Quote
  #5  
Old 01-16-2015, 03:56:55 PM
Matthew Guy Clarke Matthew Guy Clarke is offline
Subscriber
 
Join Date: Nov 2008
Location: Norwalk, Iowa
Posts: 1,866
Thanks: 969
Thanked 1,156 Times in 630 Posts
Default Re: Model Stroke v/s piston dia.

A lot of builders have told me they preference 1 1/4" bore and stroke. With a larger bore you may add stroke for looks. With lessor bore you need to keep stroke square, so 1 1/4" bore by 1 1/4" stroke.Firing chamber dictates compression. A 3/8" crank shaft is also less likely to bend. You can also use 3/16" bolts . 1/8" 5/40 is too small. A 5 3/8 " plus flywheel will give better momentum for slower running.
Every thing just seams simpler in this scale range.
Reply With Quote
The Following User Says Thank You to Matthew Guy Clarke For This Post:
  #6  
Old 01-16-2015, 04:15:02 PM
Doug Oldenburg's Avatar
Doug Oldenburg Doug Oldenburg is offline
Subscriber
 
Join Date: Feb 2008
Location: Homer, Nebraska, USA
Posts: 1,169
Thanks: 2,098
Thanked 708 Times in 406 Posts
Default Re: Model Stroke v/s piston dia.

Hey Mat........Speaking of castings & such, did you ever get around to casting those parts that I ordered last July 26 from you ? I know you said it would be awhile, so just checking again.
__________________
"So Much Iron & So Little Money"
Reply With Quote
  #7  
Old 01-16-2015, 06:30:38 PM
Heins Heins is offline
Subscriber
 
Join Date: Apr 2010
Location: Kit Carson, Colorado, USA
Posts: 2,136
Thanks: 330
Thanked 1,284 Times in 704 Posts
Default Re: Model Stroke v/s piston dia.

If you are going to build the flame licker engine, heat will travel faster in aluminum than cast iron. That is what makes the flame licker engine run.
Reply With Quote
Reply

Bookmarks


Thread Tools
Display Modes

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

F o r u m Jump

Similar Threads Chosen at Random
Thread Thread Starter F o r u m Replies Last Post
JAP 34cc model o 2 stroke pedrodepacas Small Air Cooled Gasoline Engines 2 05-17-2014 09:22:46 AM
J.A.P Model 34 2 stroke. Info needed. Rex Wellendorf Small Air Cooled Gasoline Engines 3 11-06-2011 07:49:04 PM
Model Marine Engine, 2 Stroke Air cooled, need spark help! Evan Hale OConnor Scale Model Engineering 3 04-30-2010 02:23:37 AM
Clinton 3 hp 4 stroke no serial or model number ElvisPresley Small Air Cooled Gasoline Engines 4 11-22-2009 03:39:37 PM
Model 2-stroke...almost done. NAR Scale Model Engineering 4 04-01-2008 09:05:38 PM


Use "Ctrl" mouse wheel to change screen size.
All times are GMT -4. The time now is 11:51:49 AM.

Smokstak and Enginads site search!


All use is subject to our TERMS OF SERVICE
SMOKSTAK® is a Registered Trade Mark - A Community of Antique Engine Enthusiasts
Copyright © 2000 - 2019 by Harry Matthews P.O. Box 5612 - Sarasota, FL 34277