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Post by 190mech on Oct 20, 2018 3:56:17 GMT -5
File cabinet folders make nice thin gaskets,Ive got a good selection of shim stock,what size are you looking for?
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Post by oldgeek on Oct 20, 2018 6:53:34 GMT -5
File cabinet folders make nice thin gaskets,Ive got a good selection of shim stock,what size are you looking for? Do you mean the green file hangers, or the yellowish file folders? Probably both will work I guess. As far as shim stock goes, let me get the gasket right and then see what it needs. Stacked pepsi can shims should work if I get a thinner case gasket. |
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Post by 190mech on Oct 20, 2018 8:29:44 GMT -5
I miked them both,, .011",, have always used the manilla folders (yellowish),they seem a bit stronger than the green hanging type..  |
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Post by oldgeek on Oct 24, 2018 21:32:41 GMT -5
Over the last several days I have spent another 4 hours or so on the "flow" of the cases, cylinder and piston. Enlarging the very small boost port in the cases to better match the rather large boost port in the cylinder took up part of that time. I still want to make the epoxy ramps to help direct the flow over the crank wheels, and will also likely fill in the pits where the oil channels are and just put a nice chamfer on the holes where they exit the epoxy. There is yet another thing I noticed. One end of the transfer port on each side of the cylinder is not matched at all. The cases are opened further than the port on the cylinder is. I could either blend the entry of the port on the cylinder to match the cases, or fill in the port on the cases with epoxy. It is quite a mismatch, I need to take a picture of it. Another thing, I have not been able to check the balance factor as Alex shows in a VIDEO because I cannot seem to get a consistent weight of the con rod as he does in the video. I have tried several ways to set the con rod up to weigh it but I never read the same weight twice. The measured weight varies by a couple grams each time I weigh it. I may just skip checking the balance factor. If it vibrates bad I can always revisit. |
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Post by oldgeek on Oct 25, 2018 21:33:39 GMT -5
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Post by vlatx on Oct 26, 2018 11:52:15 GMT -5
nice work!
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Post by oldgeek on Oct 26, 2018 20:33:55 GMT -5
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Post by ryan_ott on Oct 26, 2018 20:38:05 GMT -5
Psst... gear oil!
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Post by oldgeek on Oct 26, 2018 20:51:00 GMT -5
I doubt I will make that mistake again, hopefully! |
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Post by Lucass2T on Oct 26, 2018 21:12:38 GMT -5
Make sure with those cut piston skirts your exhaust port is not communicating with the crank case at TDC.
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Post by oldgeek on Oct 26, 2018 23:09:11 GMT -5
Make sure with those cut piston skirts your exhaust port is not communicating with the crank case at TDC. Now you tell me! JK  Honestly I was not sure if that mattered or not. I did look at at that previously and it's gonna be close, but not because of the skirt trimming I did ( As I found out, It is definitely because of the skirt trimming I did). I think it is because this kit was not made for a crank with such a long stroke. The bottom of the piston skirt is pretty damm close to uncovering the exhaust port at TDC. I will try to get a picture. God I am hoping this thing is gonna work. |
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Post by oldgeek on Oct 26, 2018 23:39:25 GMT -5
Make sure with those cut piston skirts your exhaust port is not communicating with the crank case at TDC. Ya mean like that huh,LoL!  All is not lost. I have a spare piston that I have not hacked up with the dremel....yet. I knew better than doing that. I remember where Brent did it one time on a mina, but I forget everything nowdays. Lucass2T thanks for saving me the hassle of a miserable fail. At least I get another chance. |
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Post by 190mech on Oct 27, 2018 4:52:48 GMT -5
Glad y'all caught that,I scrapped an entire project a few years back when a scoot piston uncovered the Ex port due to its flat cast reliefs on the sides at TDC...
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Post by oldgeek on Oct 27, 2018 9:16:14 GMT -5
So the new uncut piston covers the exhaust port pretty good. At TDC I can see a very small sliver of light leak through at the very bottom of the skirt. I was not planning on using a base gasket with the cylinder but now I think a thin one would be best, it should push the cylinder up and help to cover the EX port just a tad better. Of course using a base gasket will change durations and squish a bit. Time to make a few checks.
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Post by 190mech on Oct 27, 2018 11:40:59 GMT -5
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