Homebuild petrol engine
05-06-2013, 09:45 AM
#26
RE: Homebuild petrol engine
ORIGINAL: Marinep51
Jef, I just wish I lived close to you so that I could maybe just sit in a corner and watch your work and dream of how neat it would be if I had the know how to what you are doing. I for one think it is great and since I don't have the nearness of on-hand observations I'll sit here wishing I had your skills and watch. Thanks for the post and the experience of watching the work of a true machinist.
Jef, I just wish I lived close to you so that I could maybe just sit in a corner and watch your work and dream of how neat it would be if I had the know how to what you are doing. I for one think it is great and since I don't have the nearness of on-hand observations I'll sit here wishing I had your skills and watch. Thanks for the post and the experience of watching the work of a true machinist.
Owen
Is there a college near you that you could sign up for a machine shop course?? That would be cool for you. Lots of adults go back to college in their later years to learn new skills. I went back and took computer sciences when I was 45!
AV8TOR
05-06-2013, 09:45 AM
#27
RE: Homebuild petrol engine
2024 T4 but only because i had a piece laying around, 6061-T6 would have been plenty good. despite the very thin wall sections it has a lot of built in "bracing"to keep things rigid....designs like the DA cases really do need the strength of the higher grade alloys.
05-07-2013, 11:10 AM
#28
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RE: Homebuild petrol engine
Has anyone tried to make one using a 3D printer? I see they have made a gun from one. But its mostly plastic. I understand there is a printer that uses powdered aluminum. Y could make the crankcase,cylinder and piston out of aluminum then get a steel sleeve,crankshaft and bearings.
05-11-2013, 10:48 AM
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RE: Homebuild petrol engine
Some more pictures of my work so far, first 2 holes drilled in the back plate, for the spanner , than the mounting holes of the motor , and then the holes to secure the cylinder, the first hole drilled and tapped (M4) but the second hole drilled on 28 mm instead of 30 mm, stupid of me but I've fixedas you can see on the pictures
05-11-2013, 04:22 PM
#32
RE: Homebuild petrol engine
Jef.... Very nice machining skills all the way around. Nice to see this kind of scratch building. What brand of sticks and potentiometers did you use on the transmitter?
05-13-2013, 11:32 AM
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RE: Homebuild petrol engine
ORIGINAL: av8tor1977
Love it! Keep those pics coming.
What is the turned down area on the front bearing snout for? A timing collar/ring?
AV8TOR
Love it! Keep those pics coming.
What is the turned down area on the front bearing snout for? A timing collar/ring?
AV8TOR
05-25-2013, 02:13 AM
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RE: Homebuild petrol engine
The cylinder is of Ck 45 steel , piston aluminum 7075 and the pistonrings cast iron GG25
Some pictures of the work on the cylinder
Some pictures of the work on the cylinder
05-25-2013, 06:10 AM
#44
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RE: Homebuild petrol engine
Looking very nice, but I have a question. What is the coefficient of thermal expansion between the ck-45 and 7075 Aluminum ?
05-25-2013, 07:05 AM
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RE: Homebuild petrol engine
ORIGINAL: Cyberwolf
Looking very nice, but I have a question. What is the coefficient of thermal expansion between the ck-45 and 7075 Aluminum ?
Looking very nice, but I have a question. What is the coefficient of thermal expansion between the ck-45 and 7075 Aluminum ?
But I do not calculate that , I use a clearance of 0.002" for one inch of piston diameter
Regards Jef
05-25-2013, 02:19 PM
#47
RE: Homebuild petrol engine
jef, I just started reading this very interesting thread on your engine build. Real nice work you do for sure. I was wondering about the port timing, is it the same as the engine you chose to build your own version of? I guess you may call it a "piston" port engine & not any reed valves. If you can, could you post photos of the rod as you machine it. Thanks Very Much, Capt,n
05-27-2013, 07:12 AM
#48
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RE: Homebuild petrol engine
ORIGINAL: captinjohn
jef, I just started reading this very interesting thread on your engine build. Real nice work you do for sure. I was wondering about the port timing, is it the same as the engine you chose to build your own version of? I guess you may call it a "piston" port engine & not any reed valves. If you can, could you post photos of the rod as you machine it. Thanks Very Much, Capt,n
jef, I just started reading this very interesting thread on your engine build. Real nice work you do for sure. I was wondering about the port timing, is it the same as the engine you chose to build your own version of? I guess you may call it a "piston" port engine & not any reed valves. If you can, could you post photos of the rod as you machine it. Thanks Very Much, Capt,n
the porttiming of the new engine is 130° for the exhaust ( was 110° ) , 113° for the intake ( was 100° ) , 100° for the transfers ( was 90° ) , the compression ratio is now 6,7/1 ( was only 5/1 ) , in the future there will be certainly pictures of the rod construction ,right now I can not post any picture , internal server error .You could always go and see at another construction report from me on a Dutch forum , there are pictures between of the rod constructionhttp://www.modelbouwforum.nl/forums/bouwverslagen-vliegen/175091-bouwverslag-2cc-dieselmotor.htmlRegards Jef
05-28-2013, 03:40 AM
#49
RE: Homebuild petrol engine
ORIGINAL: jef-lemmens
Hi Captinjohn , it is a piston ported engine (old school) the porttiming of the new engine is 130° for the exhaust ( was 110° ) , 113° for the intake ( was 100° ) , 100° for the transfers ( was 90° ) , the compression ratio is now 6,7/1 ( was only 5/1 ) , in the future there will be certainly pictures of the rod construction , right now I can not post any picture , internal server error . You could always go and see at another construction report from me on a Dutch forum , there are pictures between of the rod construction http://www.modelbouwforum.nl/forums/...eselmotor.html
Regards Jef
ORIGINAL: captinjohn
jef, I just started reading this very interesting thread on your engine build. Real nice work you do for sure. I was wondering about the port timing, is it the same as the engine you chose to build your own version of? I guess you may call it a ''piston'' port engine & not any reed valves. If you can, could you post photos of the rod as you machine it. Thanks Very Much, Capt,n
jef, I just started reading this very interesting thread on your engine build. Real nice work you do for sure. I was wondering about the port timing, is it the same as the engine you chose to build your own version of? I guess you may call it a ''piston'' port engine & not any reed valves. If you can, could you post photos of the rod as you machine it. Thanks Very Much, Capt,n
the porttiming of the new engine is 130° for the exhaust ( was 110° ) , 113° for the intake ( was 100° ) , 100° for the transfers ( was 90° ) , the compression ratio is now 6,7/1 ( was only 5/1 ) , in the future there will be certainly pictures of the rod construction , right now I can not post any picture , internal server error . You could always go and see at another construction report from me on a Dutch forum , there are pictures between of the rod construction http://www.modelbouwforum.nl/forums/...eselmotor.htmlRegards Jef
post | Post #: 47
Many years ago when we used to race two strokes piston porting was it. First we modified it by installing reed valve blocks then machined holes in the piston skirt to increase the intake duration. I remember altering the floor of the intake port and the roof of the exhaust, machining some of the skirt and from the top of the pistons if there was enough room all in the quest for more performance. We burned a lot of candle wax late into the night just to get ready for next race day. We also made our fair share of boat anchors as well experimenting LOL. What fun it was when something worked and everyone else was set to scrambling to find out what you did. Ah those were the days.
Dennis
06-06-2013, 11:13 PM
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RE: Homebuild petrol engine
The cylinder liner is ready and packed to put in the deep-freezer ,the cylinder is warming up on my "Aladin" , once assembled and cooled the liner gets stuck in the cylinder .
Then top and bottom of the cylinder and liner turned to the right size. Now milling the ports trough the liner , the exhaust is ready.
I have bought the piston rings instead of to make them myself because I have absolutely no experience here.
Regards andto be continued , Jef
Then top and bottom of the cylinder and liner turned to the right size. Now milling the ports trough the liner , the exhaust is ready.
I have bought the piston rings instead of to make them myself because I have absolutely no experience here.
Regards andto be continued , Jef