Best exhaust to use?
Pazza68
Fri May 13, 2022 10:31 am
Lurker
1971 Vespa 150 sprint
Joined: 03 Mar 2022
Posts: 4
Location: Wirral
 
Pazza68
Lurker
1971 Vespa 150 sprint
Joined: 03 Mar 2022
Posts: 4
Location: Wirral
Fri May 13, 2022 10:31 am linkquote
Hi all. I have a 150 sprint veloce. Im putting a pinasco 177cc kit on it. A pinasco race crank and flytech flywheel. What's people's recommendations on a decent exhaust to use? stainless steel if possible. Thanks in advance.
scooterist
Sat May 14, 2022 5:24 pm
Molto Verboso
71' Sprint Veloce , 05' Vespa PX150, 1978 P200E
Joined: 04 Jul 2011
Posts: 1283
Location: Tucson, AZ
 
scooterist
Molto Verboso
71' Sprint Veloce , 05' Vespa PX150, 1978 P200E
Joined: 04 Jul 2011
Posts: 1283
Location: Tucson, AZ
Sat May 14, 2022 5:24 pm linkquote
I have a 71 sprint Veloce. I tried the following on my Sprint Veloce:

1) Stock (Also the smallest in size along the Malossi)
2) Sito plus (very large and bulky with poor clearance but decent performance. Noisy)
3) Polini box (10-15% larger in size than the Malossi or stock).
4) Malossi box (the smallest in size, very compact). Noisy deep
5) SR3(SIP road 3), same size as the Polini. Not too well design because the elbow hits the ground
6) Lefty Boomstick. it clears very well under the left cowl

For power the absolute best was the SR3. I tested it over and over and over with two GPS, a tachometer and a acceleration instrument device(Dragy).

The SR3 is just well above the rest in power/torque. The second best was the Polini closely followed by the Malossi. Although the top speed did not change much the acceleration improvement was significant.



GeekLion
Sat May 14, 2022 11:42 pm
Molto Verboso
Too Many piles of Junk that need too much work and too much money
Joined: 06 May 2019
Posts: 1318
Location: PNW from LBC
 
GeekLion
Molto Verboso
Too Many piles of Junk that need too much work and too much money
Joined: 06 May 2019
Posts: 1318
Location: PNW from LBC
Sat May 14, 2022 11:42 pm linkquote
I'm happy to see your in use exhaust comparison, and it also makes me sad to see the Vespas tipped over on the ground.
scooterist wrote:
I have a 71 sprint Veloce. I tried the following on my Sprint Veloce:

1) Stock (Also the smallest in size along the Malossi)
2) Sito plus (very large and bulky with poor clearance but decent performance. Noisy)
3) Polini box (10-15% larger in size than the Malossi or stock).
4) Malossi box (the smallest in size, very compact). Noisy deep
5) SR3(SIP road 3), same size as the Polini. Not too well design because the elbow hits the ground
6) Lefty Boomstick. it clears very well under the left cowl

For power the absolute best was the SR3. I tested it over and over and over with two GPS, a tachometer and a acceleration instrument device(Dragy).

The SR3 is just well above the rest in power/torque. The second best was the Polini closely followed by the Malossi. Although the top speed did not change much the acceleration improvement was significant.
Moto64
Sun May 15, 2022 2:19 am
Molto Verboso
'64 Motovespa 150S (177) , '66 Allstate SF, '65 VBB, '66 180SS
Joined: 27 Mar 2013
Posts: 1281
Location: S.Salem, NY
 
Moto64
Molto Verboso
'64 Motovespa 150S (177) , '66 Allstate SF, '65 VBB, '66 180SS
Joined: 27 Mar 2013
Posts: 1281
Location: S.Salem, NY
Sun May 15, 2022 2:19 am linkquote
GeekLion wrote:
I'm happy to see your in use exhaust comparison, and it also makes me sad to see the Vespas tipped over on the ground.
They're just tired. Who is the guy behind the curtain ?
Jack221
Sun May 15, 2022 3:15 am
Jet Eye Master
PX221 MHR, O tuned PX200, PX172 Quattrini and some motorbikes
Joined: 14 Jun 2017
Posts: 3206
Location: London UK
 
Jack221
Jet Eye Master
PX221 MHR, O tuned PX200, PX172 Quattrini and some motorbikes
Joined: 14 Jun 2017
Posts: 3206
Location: London UK
Sun May 15, 2022 3:15 am linkquote
Pazza68 wrote:
Hi all. I have a 150 sprint veloce. Im putting a pinasco 177cc kit on it. A pinasco race crank and flytech flywheel. What's people's recommendations on a decent exhaust to use? stainless steel if possible. Thanks in advance.
Which pinasco kit? What crank stroke? What carb/inlet type? What type of riding you want to do?
Jack221
Sun May 15, 2022 3:20 am
Jet Eye Master
PX221 MHR, O tuned PX200, PX172 Quattrini and some motorbikes
Joined: 14 Jun 2017
Posts: 3206
Location: London UK
 
Jack221
Jet Eye Master
PX221 MHR, O tuned PX200, PX172 Quattrini and some motorbikes
Joined: 14 Jun 2017
Posts: 3206
Location: London UK
Sun May 15, 2022 3:20 am linkquote
scooterist wrote:
I have a 71 sprint Veloce. I tried the following on my Sprint Veloce:

1) Stock (Also the smallest in size along the Malossi)
2) Sito plus (very large and bulky with poor clearance but decent performance. Noisy)
3) Polini box (10-15% larger in size than the Malossi or stock).
4) Malossi box (the smallest in size, very compact). Noisy deep
5) SR3(SIP road 3), same size as the Polini. Not too well design because the elbow hits the ground
6) Lefty Boomstick. it clears very well under the left cowl

For power the absolute best was the SR3. I tested it over and over and over with two GPS, a tachometer and a acceleration instrument device(Dragy).

The SR3 is just well above the rest in power/torque. The second best was the Polini closely followed by the Malossi. Although the top speed did not change much the acceleration improvement was significant.
How did the jetting differ between these exhausts? An exhaust with more pull will require an up jet. That exhaust with no upjet will be under its best.
Birdsnest
Sun May 15, 2022 5:26 am
Not So Moderator
VNB vsc o9c VMA vbc VSX
Joined: 28 May 2008
Posts: 6007
Location: Hustletown, TX
 
Birdsnest
Not So Moderator
VNB vsc o9c VMA vbc VSX
Joined: 28 May 2008
Posts: 6007
Location: Hustletown, TX
Sun May 15, 2022 5:26 am linkquote
Moto64 wrote:
They're just tired. Who is the guy behind the curtain ?
He's pretty excited to be there whoever he is.
Positive
koenig blues
Mon May 16, 2022 5:27 am
Veni, Vidi, Posti
a not so normal vbb2 '64, a weirdo vbx '86, a not so normal pts100 '82 and a yellow sunshine '74 sprint
Joined: 15 Jun 2009
Posts: 5777
Location: Indo
 
koenig blues
Veni, Vidi, Posti
a not so normal vbb2 '64, a weirdo vbx '86, a not so normal pts100 '82 and a yellow sunshine '74 sprint
Joined: 15 Jun 2009
Posts: 5777
Location: Indo
Mon May 16, 2022 5:27 am linkquote
Not me either, i am to busy making my own big box exhaust



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