Glow engine

Home Model Engine Machinist Forum

Help Support Home Model Engine Machinist Forum:

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
some modify : ( maybe good or not, i don't know...just thinking and doing, If wrong, I will add experience for myself )
20180725_122200.jpg
20180725_122038.jpg
20180725_122028.jpg
20180725_121952_1.jpg
 

Attachments

  • 20180725_121952.jpg
    20180725_121952.jpg
    32 KB · Views: 204
Hi all !
I have two questions:
- Can i use 4-stroke engine fuel regulator for it ?
- Fuel: How much nitro ?
Thanks.
20180727_154048.jpg
20180727_154105.jpg
20180727_154115.jpg
 
You will need two stoke model engine fuel which is methanol and oil!!! 75%methnol 25 %castor oil it will run on this but 5 % nitro will help it run better. And a good 2volt battery for the glow plug. Good luck. lol forward to the video of it running
 
I test run it, it's not running, i will unfix it and check it again, i'm wrong somewhere...
 
Try to inject /syringe with needle/ small amount of fuel straight into cylinder trough exhaust port.
This overflow sometime helps to start engine.
 
Hi guys, its pleasant to see that my boy have more brothers around the globe.
 
Not runnig?!
If you remove plug and turn shaft,move its freely?
If you put plug into head and flip prop counter clockwise,did you feel resistance by compressed air and hear popping sound?
Filament in glow plug glowing if connected to baterry?
 
Hi ixb1 !
remove plug and turn shaft,move its freely : yes
put plug into head and flip prop counter clockwise,did you feel resistance by compressed air and hear popping sound : yes
Filament in glow plug glowing if connected to baterry : yes
I think i make the clearance between the crankshaft and the font bearing to much
Untitled.jpg
 
If you put about 1/2 ml of fuel into intake valve and flip prop few times,fuel will drain from front bearing?
 
How big is shaft clearance in bearing?
 
ixb1 !
shaft clearance in bearing : 0.3 mm .
 
Last edited:
Clearance of crankshaft is too much.. you need this book, see chapter two about fits and tolerances in page number 17 (part A).
The tolerance in crankshaft/bearing in front house must be very little clearance and running without friction when the engine is new. Use the adjustable reamer to adjust the diameter in the bearing and try each time until the crankshaft goes into bearing without slack.

Download this book part A and B, print out and create a book, worth to have in your workshop. :)
https://rclibrary.co.uk/files_titles/1996/Engine_Encyclopedia_RonMoulton_partA.pdf
https://rclibrary.co.uk/files_titles/1996/Engine_Encyclopedia_RonMoulton_partB.pdf

Picture of the set of adjustable reamer.. :)
 

Attachments

  • reamer.jpg
    reamer.jpg
    28.7 KB · Views: 212
Front house bearing - 10 mm H7 = +0,000 - +0,015 = 10,000 mm - 10,015 mm
Crank shaft - 10 mm g6 = -0,005 - -0,014 = 9,995 mm - 9,986 mm

I prefer to make crankshaft first 10,000 mm when the shaft is polished with fine emery paper #500-800 or lapping ring + lapping paste for shaft if you want (+ or - not so very important in tolerance since the lathe is never 100% precision). Measure 10 mm diameter must be same in whole length of crank shaft, use emery paper if one of the part of crank shaft is too thick (must be parallel in length). Then drill the bearing house with 9,8 mm drill and use reamer to adjust the diameter, then ream into the bearing house and try each time with crank shaft until the crank shaft fit into the bearing without slack and rotate free with oil applied on.. :)
 

Latest posts

Back
Top