4 Cylinder Inline Engine

[Chris Hamel]

Good luck seating your valves. Gonna be a big job

 

[rdean]

Thanks Tom but I like my engines to run nice and slow.

I made up 10 valves today so I could get 8 that I liked.
This is the way I make them.


All valves cut to length and threaded. The intake valves are shorter by about 1/4".
Why?
Because I didn't want to make any longer ones.




I have not lapped them in yet but that will have to wait for a few days as I will be resting aboard ship.

Thanks for looking
Ray

 

[rdean]

Got home yesterday all rested up and ready to go.

First item is to make a valve leakage test plate to fit this engine.
I can will work on one cylinder at a time lapping the valves until I get good results.


Testing Cylinder #3 valves.


All four done for now but I won't know just how good until the head is bolted to the engine block with a head gasket.


Thanks for looking
Ray

 

[rdean]

I use a drag knife on a vacuum table to cut my gaskets.
I would hate to think what they would look like if I did them with a scissors and knife.
Cutting two, one for a spare.


I drilled, counter bored and tapped the four spark plug holes in the head.
Then I installed the newly cut head gasket, cylinder head, and a small flywheel to check for compression..
All four cylinders give a good kick back when the the flywheel is flipped.
All good for now.

I need a proper flywheel so I found these pieces under the bench.


Here is the result.


The flywheel is 4" in diameter and 1" wide and weighs 3lbs.
That should be about right.
Now to give it a coat of paint.

Thanks for looking
Ray

 

[Chris Hamel]

Flywheel came out nice.

 

[rdean]

Thanks Chris

I made some risers to allow for the diameter of the new flywheel.



Thanks for looking
Ray

 

[rdean]

Progress
I cutout and polished the cam support blocks and installed the bearings.
Since I was on a roll I roughed out the cam shaft.


I went to the upper cam pulley next.
The cam pulley didn't have a set screw but it did have a key way. I bored the pulley hole out past the key way and made a brass bushing, pressed it in, and bored that out to match the cam shaft.



Would you believe I had a timing belt the right length. It was left over from a previous build.
It looks like my calculations for the height of the cam supports will be right on but will need to make some cams first to be sure.


Thanks for looking
Ray

 

[Chris Hamel]

Glad to hear sometimes things really do work as planned.

 

[rdean]

Four brass cam lobes with set screws.


I also made up the timing belt tensioner and set the exhaust valve timing.


Another view.


I have good compression on all four cylinders.

Happy Dance

Thanks for looking
Ray

 

[Chris Hamel]

I love the look of the overhead cam