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Post by tsimi on Aug 4, 2018 3:12:47 GMT -5
Yeah looking really good. Did you use a regular drill to open those holes?
The belt sits really nicely on the TD. That is the Stage6 OR belt for short case right?
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Post by Lucass2T on Aug 4, 2018 3:32:57 GMT -5
Yeah looking really good. Did you use a regular drill to open those holes? The belt sits really nicely on the TD. That is the Stage6 OR belt for short case right? Yep! Used a 7mm drill for the holes and a 10mm drill to bevel the edges. The belt i used is a stage 6 R/T overrange belt for short case motors. They're a little bit shorter than the Malossi or Polini overrange belts. I was looking for something lenghtwise in between stock and malossi/polini since i use this 122mm mini overrange pulley. The s6 belt was a gamble because it may have been too long since its designed to be used with a true 128mm overrange pulley. But it's exactly the right lenght! |
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Post by Lucass2T on Aug 6, 2018 15:15:48 GMT -5
Today a package came in.  I was looking for ways to improve cooling ability on this AC motor so i can reduce capacity and in turn drag from the fan but still have enough cooling left....or something like that. So Mr. tsimi hooked me up with some 5BM cooling shrouds. He also threw in a bunch of stickers, two bracelets and the mounting hardware. Thanks man! These shrouds and fan look like a better design from the acient stock minarelli ones.  I live in a relatively cool climate so i guess i can get away with reducing the fan's capacity. After all, Minarelli motors are designed for use in warm climates like Italy and not run hot with every mild hill. Any ideas in this? I might drill one or some holes in the fans blades or maybe cut off 8 from the in total 16 blades? |
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Post by 190mech on Aug 6, 2018 16:45:21 GMT -5
Partially blocking the intake side of a squirrel cage fan lessons the velocity and the load..
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Post by Lucass2T on Aug 6, 2018 17:53:42 GMT -5
Partially blocking the intake side of a squirrel cage fan lessons the velocity and the load.. Isn't that kinda the same effect as blocking the intake of your household vacuum with your hand? The fan still tries to move the same ammount of air which is isnt there and is starting to create a vacuum (exeggerated). I guess you want the least pressure drop at the inlet compared with the outlet right? You want the fan to consume as least possible ammount of energy as possible. Same as with turbochargers...the bigger the pressure difference between the inlet and intake manifold the higher the temps and more energy is lost through temperature. I think the fan's capacity is thus big i can reduce it. By reducing it it creates less drag and in the end still creates enough flow to cool the head and cylinder. |
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Post by benji on Aug 6, 2018 22:05:54 GMT -5
Does it really need to run cooler? I've noticed that the stock fan on my Zuma cools the motor amazingly well. I've even heard that on Minarelli Motors, bigger fans actually make the motor cool too much.
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Post by Lucass2T on Aug 7, 2018 1:34:41 GMT -5
No it doesnt need to run cooler. It needs to run the same temps as normal, but with less drag from the fan.
When i fit a more effiecient system which without mods and @ a given rpm indeed runs cooler, i can reduce the cooling capacity. I can reduce capacity by reducing the fans capacity in a way it moves less air and thus reduce drag.
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Post by Lucass2T on Aug 7, 2018 14:32:11 GMT -5
Took it for a test drive. Runs good, a bit rich in the middle but nice idle and MJ is almost spot on. But after a while i saw this...  The baffle discolored quite a bit all the way from the belly to the tail pipe. What does this tell me? Something with ignition? Too advanced? Or maybe too retarded (turned the stator counter clockwise after i modded it). Help me out guys, do i need to change ignition timing? I need to take it on a 25km trip back to my place real soon. |
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Post by ryan_ott on Aug 7, 2018 15:31:49 GMT -5
I’ve never seen that my thoughts would either be too small stinger pipe but that doesn’t look to be the case or timing too far retarded sending all the heat into the pipe.
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Post by Lucass2T on Aug 7, 2018 16:17:35 GMT -5
I've only seen a blueish baffle with this guy.
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Post by 190mech on Aug 7, 2018 16:30:21 GMT -5
Turning the stator counter clockwise would advance the timing,but retarded timing will put more heat into the pipe..If your pipe just changed color,I'd put a timing light on it and see whats going on..A restriction in the silencer could cause that too...  |
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Post by Lucass2T on Aug 7, 2018 17:02:32 GMT -5
Turning the stator counter clockwise would advance the timing,but retarded timing will put more heat into the pipe..If your pipe just changed color,I'd put a timing light on it and see whats going on..A restriction in the silencer could cause that too...  Theres no restrictor in the silencer, nor anywhere else in the pipe. A timing light is always nice to have at hand. The motor ran great btw. I drove it home from my dad's which is about 25km from my place. It's a bit sluggish on the throttle which is probably a combination of a motor that needs more tuning, a too rich needle/clip position and a pipe that's simply weak in lower revs. Once it gets into the powerband it runs great. |
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Post by 190mech on Aug 7, 2018 18:24:53 GMT -5
Sluggish could be retarded timing also!
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Post by harleyracer59 on Aug 13, 2018 2:42:12 GMT -5
have you ran that pipe before? it could be running a bit rich and or theres some kind of restriction in the end of that chamber, possibly in the silencer because the colors in the stinger also.
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Post by Lucass2T on Aug 13, 2018 4:00:30 GMT -5
have you ran that pipe before? it could be running a bit rich and or theres some kind of restriction in the end of that chamber, possibly in the silencer because the colors in the stinger also. I haven't ran it before. Nor haven't run it overly rich later on. Maybe only a little rich because i had to tune t after all. Theres no restrictor in the silencer. I took it apart, cleaned it and put fresh packing inside before i first started it. But the motor runs super strong, a restrictor would have been super obvious right from the first time i took it for a spin. |
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