Machining the Connecting Rod for 11.7cc Two Stroke Engine

  Рет қаралды 2,375

Strittmatter Iron Works

Strittmatter Iron Works

Күн бұрын

Пікірлер: 23
@RustyInventions-wz6ir
@RustyInventions-wz6ir Ай бұрын
Very nice work sir. You made it look easy. It did turn out very nice
@flyingdream_mf
@flyingdream_mf Ай бұрын
perfect
@Preso58
@Preso58 Ай бұрын
Nice job. Regards, Preso
@grntitan1
@grntitan1 2 ай бұрын
Fixturing is the key for those fiddly parts. Turned out nice. Look forward to the next vid.
@strittmatterironworks
@strittmatterironworks 2 ай бұрын
Thank you! Hopefully I can get the next video out in a month rather than a year.
@aeroearth
@aeroearth Ай бұрын
You may well find 6061-T6 too weak for a conrod. I machine my model aero engine's conrods usually from high tensile 2024-T3 and for highly stressed conrods 7075-T6. However the 2024-T3 has a higher fatigue life thatn that of 7075-T6. Bit safer to do the rotary milling by making a mandrel to clamp the conrod and rotary milling in a rotary table set with its axis vertical. Use a paper feeler to judge when you are getting close to blending in with the shank's milled surfaces. Wrist pins from AO drill rod blank (in the USA) and silver steel in the UK/Australia/NZ hardened and tempered to dark straw and finely finished to size. Really good idea to machine the ends of the wrist pins to a radius first at just less than that of the bore. Wire circlips are an even better solution. Subscribed.
@strittmatterironworks
@strittmatterironworks Ай бұрын
Thank you! I have more 6061 than 2024. I can't see wasting my limited materials on this particular engine. My approach is, let's get it to run first! I have some 2618 for pistons but will probably use 6061. It will be interesting to see how the subpar alloys hold up. For the wrist pins in a few past engines I pressed bronze buttons on each end. I agree wire circlips would be ideal.
@erdelybela2416
@erdelybela2416 Ай бұрын
It is not the skill of an acomplished machinist that is to be envied in You, but the confidence that goes with all that knowledge, indeed the almost outlandish nerve to just create a truly scratch built model engine - such a difficult task even with plans because the tight tolerances.
@strittmatterironworks
@strittmatterironworks 29 күн бұрын
Thank you 👍
@TangentJim
@TangentJim Ай бұрын
Great Planning - Nice Holding Fixture . Two Thumbs Up -- Jim
@strittmatterironworks
@strittmatterironworks Ай бұрын
Thanks Jim! 👍
@Andrew_Fernie
@Andrew_Fernie 2 ай бұрын
Nice 👍
@gwheyduke
@gwheyduke 2 ай бұрын
Really nice work. Looks good 👍
@strittmatterironworks
@strittmatterironworks 2 ай бұрын
Thank you!
@fabientuizat1129
@fabientuizat1129 Ай бұрын
Merci !!!
@fivebob8245
@fivebob8245 Ай бұрын
6061 is not strong enough for a conrod, you need to use 2024 or 7075. It also it needs to have a bronze bush, and a hole drilled at the big end for oiling. The big end should have .002"-.003" clearance to allow for proper lubrication of the big end.
@strittmatterironworks
@strittmatterironworks Ай бұрын
Thanks. This isn't going to be a very high performance engine. Cross scavenge with piston baffle rather than schnuerle porting.
@fivebob8245
@fivebob8245 Ай бұрын
@@strittmatterironworks You may get away with 6061, but I'd still use 2024 in a sport engine half that size, especially if you're not going to bush the bottom end as 2024 is a better journal bearing against steel than 6061. The comments about big end clearance and oil holes still apply though regardless of the material you choose. The only exception would be if there was an oil hole in the crankpin, then you wouldn't need one in the rod.
@truebluekit
@truebluekit Ай бұрын
nice work. thanks for sharing👍
@yankeedoodle7693
@yankeedoodle7693 2 ай бұрын
Quality engine work is hard to find these days. Well, not any more. What size engine is this going in?
@strittmatterironworks
@strittmatterironworks 2 ай бұрын
It's 11.7cc. Plans are to put it in an rc plane. Spark ignition but might make a glow plug nitro version as well.
@dhal22
@dhal22 Ай бұрын
As an avid rc plane builder/enthusiast just this comment alone made me hit the subscribe button.
@strittmatterironworks
@strittmatterironworks Ай бұрын
Thanks! With this engine in its current configuration I definitely don't need to worry about a tail heavy plane. Its quite the chunker!
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