Mike Walters, London
Designed by Jerry E Howell
1 cylinder 4 cycle 1 inch bore 1.375 stroke
This is my second engine by Jerry and my first 4
stroke. The design is very well put together by Jerry and there is lots of
room to change the design to make it your own or to aid in ease of machining
for people with limited machines/tooling in their shop.
As almost every engine builder will testify the
rings were the most challenging part for me as I was given the wrong material
for them right from the start. I asked for cast iron and got pre hard 4140.
Not having worked with cast iron at this point I
was none the wiser, I made a minimum of 80 rings trying to get them to seal
for more than one run. The only thing that saved me was getting a cast part to
machine at work and realizing what I had been using before had cut
different than what I was machining now.
I went back got cast iron re made the rings and
cylinder head ( it was also made from pre hard ) and they sealed first try
using a variety of peoples methods mixed together. My opinion on the
difficulty of making rings has now changed , they are pretty easy when you use
the right materials.
There are some paint touch ups from final
assembly to put on and then it can go on the shelf as a completely finished
The engine runs for hours at a time every weekend
never skipping a beat and has well over 65 hours on it at this point.
I would advise anyone looking to do long runs with
this or any other type of engine to use hardened O/1 bushings and pins all
over from the start to help reduce wear.
Should anyone wish to see a video of the engine
running feel free to email me and I will send you a short clip and more
pictures of any areas you may wish to see closer.
I recommend that any novice machinist build this
engine as it is a great design.
Copyright 2004, Florida Association of Model Engineers
and engine builder as noted above,
All rights reserved.