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Post by 190mech on Mar 30, 2014 19:31:36 GMT -5
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Post by 2stroked on Mar 30, 2014 20:49:15 GMT -5
Thanks 190mech, looks like just the thing for me. How much of a change from stock port timing/ power would 3mm make. That rod will be used with a pipe. I won'r be able to copy the performance of a Peace Pipe,but I am trying out a few pipe programs, and will eventualy make an expansion pipe. That rod, with a good pipe along with GOOD bearings and seals should actualy be worthy of a Polini kit.
Am I wrong in assuming that 3mm will change the power curve of the engine? I have been scared to mess with port timings yet, worried about the crank, besides how could I realy tell with a stock pipe, how much of a change what makes?
Thanks for the link John.
Thanks Brian
Chris
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Post by moofus02 on Mar 30, 2014 22:03:54 GMT -5
The 3mm longer rod doesn't change the stroke you just space the Cylinder up 3mm to compensate for the rod length your port timings will stay the same
Sent from my SPH-L720 using proboards
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Post by 2stroked on Mar 31, 2014 6:24:41 GMT -5
I thought about making the spacer when the pump arrives. Before the rod kit. Just for kicks, but will more than likely wait.
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Post by usmcdoc on Mar 31, 2014 8:11:01 GMT -5
I thought about making the spacer when the pump arrives. Before the rod kit. Just for kicks, but will more than likely wait. Many of us have ready made spacers we could get to ya..vendors also sell them...and some just use extra base gaskets. Making one would take some time and effort..and possibly a machine shop.. |
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Post by 2stroked on Mar 31, 2014 9:05:44 GMT -5
I actualy have one made of steel I use as a template for making cork base gaskets. I made it from an old vcr case.
I need to find some aluminum sheet, or just cheat and buy a spacer from someone here.
I saw on another forum that many used old washer/ dryer cases for pipe making.
I didn't think that steel was thick enough, or would it be?
Aby one have a 3mm aluminum spacer for sale?
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Post by 190mech on Mar 31, 2014 9:14:07 GMT -5
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Post by 2stroked on Mar 31, 2014 9:22:05 GMT -5
About the pipe steel, I hadn't read 190mech's tech piece yet. Now I'm realy gonna try a pipe design. Thanks a load John.
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Post by 2stroked on Mar 31, 2014 14:39:38 GMT -5
Gonna go look at a bunch a motors tomorrow. Hey, would a long case still hang in my eton frame, or does it HAVE to be another short case? I am not sure what I can get. Someone, please help, I don't want to get stuck with something I can't use. I am totaly lost on this.
Chris
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Post by 90GTVert on Mar 31, 2014 15:35:21 GMT -5
I think timing would actually change with the longer conrod even setup for the same port heights and such, but it should not be enough to worry you. I plugged it into a porting calculator... just some ballpark numbers for a minarelli... and it changed about 1/2 degree duration. You'd likely change it more than that by slight differences in the new setup's height. I think you already have a long case don't you? I've only worked on a few Beamers and it's been a while, but they all ran big 130/90/10 tires IIRC. Should be a long case if they fit those. Some short and long case info here: 49ccscoot.proboards.com/thread/999/90cc-minarelli-engine-swap-info |
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Post by 2stroked on Mar 31, 2014 17:53:20 GMT -5
Okay, props and much respect to 190mech for his inteligence,and dedication for pipe building and design. I have been trying different apps, trying to get a good chamber design, but no luck. The apps I have encountered only give segment length and pipe diameter. None of them seem to include dimensions for the trapazoid shaped pieces required for the cone shapes.
Right about now I am regreting sleeping through geometry class!lol I tried using the forums pipe tool, but my phone will not open it so manual math is needed.....DAMN!
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Post by 190mech on Mar 31, 2014 19:16:52 GMT -5
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Post by 2stroked on Mar 31, 2014 20:10:53 GMT -5
Thanks John, I did use that one too. Maybe you all get something different on a computer, but on my phobe, I get segment length, and diamiter. From there I have to find the formulas to turn tge degreed tapers into trapazoid pieces. Hell, u know more about it than I ever will! But it will be fun to try! I figure if I take my time with the math, maybe I will end up with SOMETHING functional, just nothing even close to a Peace Pipe.
Chris
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Post by 190mech on Mar 31, 2014 20:22:00 GMT -5
Ive given you cone calculator links,,if ya gotta do it the old school way like I did in the 70's,here is a pic of how to do it..;  |
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Post by moofus02 on Mar 31, 2014 20:26:30 GMT -5
Ive given you cone calculator links,,if ya gotta do it the old school way like I did in the 70's,here is a pic of how to do it..; That looks like work Sent from my SPH-L720 using proboards |
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