|
|
Post by stepthrutuner on Nov 1, 2011 21:59:36 GMT -5
I'm blinging out my scoot (yes I still have a scooter. lol.) and desire input as to a chrome pipe. The choice is between a Stage 6 Pro Replica or Technigas RSII 70 - both CE marked. I am leaning toward the the RSII 70 even though it costs a bit more. SPMoto is the vendor. It's for a 48mm TP Trophy Series sucking a 21 PHBG. I may raise the cylinder 0.5mm and ditch the head gasket. Other than that I'll just be opening up the xfer bottoms. Am I making the right call on the pipe?. :stumped: :itshere: :dunno: :popcorn:
|
|
|
|
Post by reveeen on Nov 1, 2011 23:35:23 GMT -5
Not really an "expert" but:
On page 2 of Brent's 90cc build thread (in the tech section) he has a chart up of 2 cycle timing vs. rpm. Check the timing of your engine and, using that chart, determine at what rpm the power is arriving.
Buy whichever pipe "arrives" at the same time (or a little earlier) by checking the dyno graphs on each pipe.
What you are trying to avoid: an engine (fairly mild) that "arrives" @6500 rpm matched with a pipe that "arrives" @ 9500 rpm.
|
|
|
|
Post by 90GTVert on Nov 2, 2011 7:24:50 GMT -5
|
|
|
|
Post by stepthrutuner on Nov 2, 2011 12:50:19 GMT -5
The cylinder should rev to 11,000 but I don't really like to operate consistently above the low 10s. I've modded the travel of my variator and torque driver pulleys and the revs dropped close to 1500 rpm with (if I remember correctly) the stock soft contra spring and 36g. of roller mass so I'm hoping for a cruising zone closer to 9000 and my roller mass will probably be close to 30g. or a little less.
The RSII 70 looks to have a less steep baffle taper which should support revving past the max power point of the pipe. Long pipes are da bomb for street running in my book.
|
|
|
|
Post by jmkjr72 on Nov 2, 2011 17:27:14 GMT -5
personaly i would go with the stage 6 over the rsII i know the stage 6 rocks good on a tp trophy kit you do have to be carefull if you didnt up grade the crank that pipe will rev into the kill the crank zone with that pipe
|
|
|
|
Post by 190mech on Nov 2, 2011 19:36:04 GMT -5
Reg, Without knowing the dimensions its just a guess..The stage 6 appears to have a 3 stage diffuser which is tops in making a long powerband,quality looks a bit better too..Unless you can find some real tests,all I can say is go with what tickles your fancy!!
|
|
|
|
Post by stepthrutuner on Nov 2, 2011 19:42:33 GMT -5
personaly i would go with the stage 6 over the rsII i know the stage 6 rocks good on a tp trophy kit you do have to be carefull if you didnt up grade the crank that pipe will rev into the kill the crank zone with that pipe From what I've heard Piaggios can take the revs on a stock crank up to around 12,000 no sweat. |
|
|
|
Post by jmkjr72 on Nov 2, 2011 20:01:06 GMT -5
duhhhh i was thinking hm engines
|
|
|
|
Post by stepthrutuner on Nov 2, 2011 21:52:19 GMT -5
|
|
|
|
Post by 90GTVert on Nov 2, 2011 21:59:12 GMT -5
In the header.
|
|
|
|
Post by stepthrutuner on Nov 2, 2011 22:55:04 GMT -5
That's a lot of restriction. Does that come in CE marked pipes?
|
|
|
|
Post by 90GTVert on Nov 3, 2011 7:23:12 GMT -5
|
|
|
|
Post by jmkjr72 on Nov 3, 2011 10:09:39 GMT -5
yes the euro aproved pipes have that restriction in them that is how they get approved
but every euro aproved pipe i bought has a huge red warning lable around the restriction do not remove this unless you want power
|
|
|
|
Post by stepthrutuner on Nov 3, 2011 13:54:01 GMT -5
yes the euro aproved pipes have that restriction in them that is how they get approved but every euro aproved pipe i bought has a huge red warning lable around the restriction do not remove this unless you want power  BTW, I have ordered the RS II. SPMOTOSTORE was out of the Stage 6 Pro Replica Chrome. Hope I'll be happy. At this moment I am planning on selling the Atlantis when I am happy with the cosmetics. Although I probably went against the consensus advice here I appreciate all of you guy's input. |
|
|
|
Post by 2strokd on Nov 4, 2011 7:06:06 GMT -5
Why ya gonna sell it?
|
|
