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Post by Lucass2T on Mar 7, 2015 4:12:01 GMT -5
COOL!Ive never seen a Gruppo B pipe before,belly diameter looks a bit smaller.Would be nice to measure and compare! Exactly! Thats the first thing i noticed too! Did a quick measure and its about 90/95mm. Im guessing it might be a 50cc pipe... Well im getting out of bed now to measure the thing properly. |
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Post by iwiketuddlz on Mar 7, 2015 5:54:38 GMT -5
Wow sweet pipe I have one simalar to it as well... Nice build
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Post by Lucass2T on Mar 7, 2015 6:12:12 GMT -5
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Post by 190mech on Mar 7, 2015 6:40:23 GMT -5
I will calculate it and report when I get back from my weekend road trip!
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Post by craisin on Mar 7, 2015 10:05:05 GMT -5
nice work
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Post by 190mech on Mar 8, 2015 19:05:37 GMT -5
Here are my findings,Head pipe(first 2 sections)1.5 degrees-305mm long
1st stage diffuser 6.5 degree
2nd stage diffuser 7.2 degree
Belly
Baffle cone 12.3 degree
This appears to be a 50-70cc pipe tuned for 11,000 max RPM's,around 185+ degrees exhaust duration,volume 3369 cc,should be a good street pipe for a mild cylinder..
Again,these calculations are for a hollow pipe with no internal baffles or screens...
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Post by Lucass2T on Mar 9, 2015 3:27:34 GMT -5
Thanks 190! I Guess this pipe matches up quite well with the cylinder i will be using. @190, is there a direct connection between headpipe diameter and potential output? I mean, my metrakit pipe has a 27mm headpipe and this TJT 25mm as well as the polini 4 race 1 have (will take dimensions of those pipe next weekend).
Does that mean the metrakit SP pipe is suited for higher output engines or maybe more-than-70cc engines?
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Post by 190mech on Mar 9, 2015 4:23:52 GMT -5
The diameter of the headpipe plays a small part.The length of the headpipe and its taper is a better indicator.Also the diffuser cone angles change a pipes character greatly.All the dimensions and angles work together in order to make a good working pipe..
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Post by 2strokd on Mar 10, 2015 9:17:42 GMT -5
Sounds like a good one! Love the new avatar pic too Lucass  |
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Post by Lucass2T on Mar 10, 2015 9:22:12 GMT -5
Sounds like a good one! Love the new avatar pic too Lucass Thanks. I started to get annoyed from my own 'non-scoot-kinda-show-off-avatar'.....you know hehehe. |
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Post by 2strokd on Mar 10, 2015 9:23:15 GMT -5
I didnt mind the CR either really  |
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Post by Lucass2T on Mar 10, 2015 15:07:18 GMT -5
Started de-rusting the pipe with the grinder because it was in a terrible (rusty) shape. Ended up with three metal splinters in my cornea  . Went to the hospital and they needed to drill them out!  DRILL THEM OUT! man...i'll never not wear my safety goggles again! |
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Post by 2TDave on Mar 10, 2015 15:53:04 GMT -5
Ouch!!! Hope you feel better.
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Post by Lucass2T on Mar 10, 2015 16:39:46 GMT -5
I do...it's healing quite quick. But it feels like someone poored a cup of sand right into my eye. Holding it open isn't that bad but when i close it the agony starts  . |
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Post by 2TDave on Mar 10, 2015 17:51:31 GMT -5
I've scratched my eye and it sucked! They did put a liquid in my eye that helped numb it but it wore off and hurt.
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. Went to the hospital and they needed to drill them out! 
DRILL THEM OUT! man...i'll never not wear my safety goggles again!
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