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NickG:
Chuck,

Forgot to ask, what angle taper was on the tapered pins for the crank and were the holes normal or tapered. I will have to read through the igniter bit again to get my head around it I think.

Nick

chuck foster:
you guys are too kind with your comments and i'm glad you are enjoying this thread.

nick i think standard taper pins have a diametral taper ¼ in. in 12 in. (0.6 cm in 30 cm)

i haven't been doing much in the shop the last few days due to all the holiday function's but now that's over i hope to get some work done.

i did manage to fabricate the main bearings for this engine. now i didn't photograph all the machining step's because i think you guy's will figure thing's out from the pictures.

the first order of business was to cut out the pieces of brass that would be needed

i then soft soldered the two set's of bearing halves together. the bottom half of the bearing has a flat on the bottom and the top half is rounded as you can see in the picture

i then faced off the bearing halves in the lathe. next i center drilled and then drilled them under size. the reason for drilling under size is the fact that i have to silver solder some more pieces to the bearing halves and i will ream the holes to size after the silver soldering.

roughed out and ready for the next step

the next step was to mill little cresent shaped cut out's, this will be were the pieces get silver soldered into.

here the part's are silver soldered in place (not very good at silver soldering)

i gave the bearings a bit of a cleaning but once they are fitted to the engine they will get a complete polish

the next piece was the cylinder support rods, now nothing fancy here just a bit of turning and threading to get the job done.
the four silver rod's in the picture are the original one's that i had to copy. i made the new one's out of brass for a different look.

well that's all for today, the next pieces to make are the connecting rod and piston.

i hope this all makes sense, if not just let me know and i will try and re-write it.

chuck :wave:

Powder Keg:
Looking pretty All right Chuck!!! I really like the built up connecting rods.

chuck foster:
well i got out to the shop early today and managed to get the connecting rod almost done!

the first picture show's the original connecting rod and the piece of steel i'm going to use to make the new one is in the milling machine vise.
now i'm not going to make a connecting rod exactly like the original, i'm going to make a round rod instead of an "I" beam style rod. i think a round rod will look better with the round cylinder support rod's.

the first step is to center drill,drill and ream the bearing hole for the wrist pin. the wrist pin bearing will be a bronze bearing.

next i put the piece of steel in my lathe and started turning the middle section round

here the lathe work is done, now all i have to do is finish shaping the wrist pin end and make the wrist pin bearing and the big end bearing.

here it is sitting beside the original cast brass "I" beam rod

well now it's off to visit some of my wife's family. hope to get some work done tonight.

chuck :wave:

chuck foster:
got some time in the shop tonight and i finished the connecting rod for this engine.

i manage to get the exhaust rocker arm 1/2 done as well. the original rocker arm is the brass one.

i started work on the ignitor trip rod guide bracket. here is the original one

now this bracket has a funny twist in it as can be seen in the following picture. i was wondering how to make the twist just perfect :scratch:

so instead of getting too technical i just gripped the piece in the mill vise and twisted it with my adjustable wrench.

here it is sitting beside the original, now i left the piece unfinished because as i build the rest of the engine i will cut this bracket to fit.

i managed to finish the exhaust rocker push rod, it is a very simple piece and here it is.

it has a thread on one end to adjust the valve clearance.

and that my friends is all for tonight, tomorrows mission is to finish the exhaust rocker arm and all the ignitor trip stuff.
i'm getting excited and just can't wait to hear it run.

chuck :wave:

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