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Best exhaust to use?
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Pazza68
UTC
Lurker
1971 Vespa 150 sprint
Joined: UTC
Posts: 4
Location: Wirral
 
Pazza68
Lurker
1971 Vespa 150 sprint
Joined: UTC
Posts: 4
Location: Wirral
UTC quote
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 avatar
scooterist
UTC
Molto Verboso
71' Sprint Veloce , 05' Vespa PX150, 1978 P200E
Joined: UTC
Posts: 1618
Location: Tucson, AZ
 
scooterist
Molto Verboso
@scooterist avatar
71' Sprint Veloce , 05' Vespa PX150, 1978 P200E
Joined: UTC
Posts: 1618
Location: Tucson, AZ
UTC quote
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.
Forum member supplied image with no explanatory text
@geeklion avatar
GeekLion
UTC
The Dude
Too Many piles of Junk that need too much work and too much money
Joined: UTC
Posts: 2461
Location: PNW from LBC
 
GeekLion
The Dude
@geeklion avatar
Too Many piles of Junk that need too much work and too much money
Joined: UTC
Posts: 2461
Location: PNW from LBC
UTC quote
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. Crying or Very sad emoticon
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 avatar
Moto64
UTC
Ossessionato
'64 Motovespa 150S (177) , '65 VBB, '66 Allstate SF, '66 180SS, '58 LD 125 (150)
Joined: UTC
Posts: 2411
Location: S.Salem, NY
 
Moto64
Ossessionato
@moto64 avatar
'64 Motovespa 150S (177) , '65 VBB, '66 Allstate SF, '66 180SS, '58 LD 125 (150)
Joined: UTC
Posts: 2411
Location: S.Salem, NY
UTC quote
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. Crying or Very sad emoticon
They're just tired. Who is the guy behind the curtain ?
Jack221
UTC
Jet Eye Master
PX221 MHR heavily tuned, PX200 O tuned, PX181 M1XL tuned, PX166 tuned a bit and some motorbikes
Joined: UTC
Posts: 5136
Location: London UK
 
Jack221
Jet Eye Master
PX221 MHR heavily tuned, PX200 O tuned, PX181 M1XL tuned, PX166 tuned a bit and some motorbikes
Joined: UTC
Posts: 5136
Location: London UK
UTC quote
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
UTC
Jet Eye Master
PX221 MHR heavily tuned, PX200 O tuned, PX181 M1XL tuned, PX166 tuned a bit and some motorbikes
Joined: UTC
Posts: 5136
Location: London UK
 
Jack221
Jet Eye Master
PX221 MHR heavily tuned, PX200 O tuned, PX181 M1XL tuned, PX166 tuned a bit and some motorbikes
Joined: UTC
Posts: 5136
Location: London UK
UTC quote
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 avatar
Birdsnest
UTC
Not So Moderator
VNB VSC VSX Li150 C125 - (o9c vmb vse)
Joined: UTC
Posts: 9943
Location: Hustletown, TX
 
Birdsnest
Not So Moderator
@birdsnest avatar
VNB VSC VSX Li150 C125 - (o9c vmb vse)
Joined: UTC
Posts: 9943
Location: Hustletown, TX
UTC quote
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 avatar
koenig blues
UTC
Veni, Vidi, Posti
a not so normal vbb2 '64, a weirdo vbx '86, a not so normal pts100 '82, a yellow sunshine '74 sprint and one odd lady in the red
Joined: UTC
Posts: 5833
Location: Indo
 
koenig blues
Veni, Vidi, Posti
@koenig_blues avatar
a not so normal vbb2 '64, a weirdo vbx '86, a not so normal pts100 '82, a yellow sunshine '74 sprint and one odd lady in the red
Joined: UTC
Posts: 5833
Location: Indo
UTC quote
Not me either, i am to busy making my own big box exhaust
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