Let's build a 4 cylinder

[crazypj]

Is the next one going to be a flat eight with two rods on each pin?

 

[rdean]

I don't think so crazypj but you never know.

This was exhaust day so let me know what you think.




Thanks for looking
Ray

 

[Boswell]

I like the rakish angle A little creative bending for equal length pipes would get bonus points

 

[rdean]

Thanks Boswell

Ray

 

[rdean]

Kind of jumped around today starting with the intake system.
I soldered some 1/8" copper 90s on the intake brass nipples.
I am still not sure exactly how the rest of the intake assembly will be made.


I then went to the electrical system and mounted all the components.


Hooked up the ground and added an on/off switch.


Rechecked the valve timing and sequence of firing. 1-3-2-4.
Adjusted the ignition timing at just before TDC and I am getting a good spark.

Thanks for looking
Ray

 

[Chris Hamel]

I really like your exhaust headers. Did you use something like Cerrobend?

 

[rdean]

Thanks Chris
I was going to use a filler but thought I would try one bend without. It worked so well I just kept on bending and I didn't even have the right size dies.
Sometimes you just get lucky.

Ray

 

[crazypj]

Are the exhaust pipes copper or brass?
Nice angles, and, you don't need equal length pipes, it's been found they don't actually improve power output very much but tuned lengths will.
Just as an aside, the first 'tuned length' exhaust system was made in the 1860's and tripled the power output. It was 108ft long for a stationary engine turning at less than 100rpm (I think in a Cornish tin mine, would have to look it up since I haven't thought about it for 13~14 years)

 

[rdean]

That's an interesting story crazypj and surprised it hepled that much.
The pipes are brass tubing 5/16 X 1/4 on the last engine I built I used brass plated tubing.
It was not fun to work with.

Ray

 

[rdean]

I have finally decided on the intake manifold. I wanted all the runners to be close to the same length and with the same amount of restriction. Here are the parts I made for the manifold.


And a few views of the finished intake and carburetor.








This is similar to what I did on my 5 cyl radial engine's intake.

I also added some brass collars at the head end of the exhaust pipes to hold them securely in place.

I will be gone for the rest of this week but I will be checking in daily.

Thanks for looking
Ray