Hi to all.
I just got a Taffspeed MK 4 Goldline for my PX and after seeking information about it I have not found anything but generic information like in Scooter Center, SIP ...
My engine is a 221 Malossi, RD reeds and Keihin 35 AS and I wonder if you could tell me the degrees of intake and exhaust most recommended for the Taffy and your impressions and tips about it.
Thanks
Taffspeed degrees
- Terrible Taff
- Dealer
- Posts: 71
- Joined: Tue Apr 28, 2009 8:26 pm
- Main scooter: Lambretta's & Vespa's
- Location: 21 Meyricks, Coed Eva, Cwmbran, Torfaen, NP44 6TU
- Contact:
santacama wrote:Hi to all.
I just got a Taffspeed MK 4 Goldline for my PX and after seeking information about it I have not found anything but generic information like in Scooter Center, SIP ...
My engine is a 221 Malossi, RD reeds and Keihin 35 AS and I wonder if you could tell me the degrees of intake and exhaust most recommended for the Taffy and your impressions and tips about it.
Thanks
Hi there,
I have not sold any of my TAFFSPEED Mk4 Vespa exhausts since February 2010 when I when into hospital for an operation.
If you have purchased an exhaust system after that date it is a copy from Veitnam!
That aside;
You say that you have a reed valve unit fitted? Has the crankcase been opened out to remove the sealing pad area in the case?
If this has been done then you have the potential of 360 degrees of inlet period.
Use the cylinder as manufactured, with the standard stroke crankshaft 57mm not a 60mm as you are doing - it alters the transfer & exhaust timings too much!
Fit a PX125-T5 4th gear to drop the gearing so peak power output in 4th drops from 80mph to 70mph!
If not then it is very hard to pull maximum rpm in 4th.
The cylinder head needs to be reprofiled with 18cc in the combustion chamber when the piston is dropped into the head. The squish needs to be set at 1.2-1.5mm this extra volume gives you 22.5-23.5cc when fitted. (10.3>9.9 to 1 geometric compresion)
The internal tailpipe is there to reduce noise & keep the back pressure in the exhaust system.
I hope this has been of help,
Ian Frankland
Taffspeed
Tel: 07794 003276
Email: sales@taffspeed.co.uk
Ian T Frankland
Taffspeed Design Innovations
Mob: 07971 818693
Email: terrible.taff@gmail.com
Taffspeed Design Innovations
Mob: 07971 818693
Email: terrible.taff@gmail.com
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- registered user
- Posts: 119
- Joined: Mon Feb 02, 2009 8:10 pm
- Location: Sevilla (Spain)
- Contact:
l got my exhaust from a friend that got it from Scooter Center, is a good one, not a copy ....:]Terrible Taff wrote:santacama wrote:Hi to all.
I just got a Taffspeed MK 4 Goldline for my PX and after seeking information about it I have not found anything but generic information like in Scooter Center, SIP ...
My engine is a 221 Malossi, RD reeds and Keihin 35 AS and I wonder if you could tell me the degrees of intake and exhaust most recommended for the Taffy and your impressions and tips about it.
Thanks
Hi there,
I have not sold any of my TAFFSPEED Mk4 Vespa exhausts since February 2010 when I when into hospital for an operation.
If you have purchased an exhaust system after that date it is a copy from Veitnam!
That aside;
You say that you have a reed valve unit fitted? Has the crankcase been opened out to remove the sealing pad area in the case?
If this has been done then you have the potential of 360 degrees of inlet period.
Use the cylinder as manufactured, with the standard stroke crankshaft 57mm not a 60mm as you are doing - it alters the transfer & exhaust timings too much!
Fit a PX125-T5 4th gear to drop the gearing so peak power output in 4th drops from 80mph to 70mph!
If not then it is very hard to pull maximum rpm in 4th.
The cylinder head needs to be reprofiled with 18cc in the combustion chamber when the piston is dropped into the head. The squish needs to be set at 1.2-1.5mm this extra volume gives you 22.5-23.5cc when fitted. (10.3>9.9 to 1 geometric compresion)
The internal tailpipe is there to reduce noise & keep the back pressure in the exhaust system.
I hope this has been of help,
Ian Frankland
Taffspeed
Tel: 07794 003276
Email: sales@taffspeed.co.uk
Inlet is 360, squish 1,3, compression 10,5:1, short 4 gear, ...... but stroke is 60 and timig 126/186. Do you see any problem?
- Terrible Taff
- Dealer
- Posts: 71
- Joined: Tue Apr 28, 2009 8:26 pm
- Main scooter: Lambretta's & Vespa's
- Location: 21 Meyricks, Coed Eva, Cwmbran, Torfaen, NP44 6TU
- Contact:
From what you say the port timingd are there should be now issues with it all working.
Ian Frankland
Taffspeed
07794 003276
Ian Frankland
Taffspeed
07794 003276
Ian T Frankland
Taffspeed Design Innovations
Mob: 07971 818693
Email: terrible.taff@gmail.com
Taffspeed Design Innovations
Mob: 07971 818693
Email: terrible.taff@gmail.com
-
- registered user
- Posts: 119
- Joined: Mon Feb 02, 2009 8:10 pm
- Location: Sevilla (Spain)
- Contact:
Sorry Ian but I do not understand what you mean. If timings are to high I can lower the barrel 1 mmTerrible Taff wrote:From what you say the port timingd are there should be now issues with it all working.
Ian Frankland
Taffspeed
07794 003276
- Terrible Taff
- Dealer
- Posts: 71
- Joined: Tue Apr 28, 2009 8:26 pm
- Main scooter: Lambretta's & Vespa's
- Location: 21 Meyricks, Coed Eva, Cwmbran, Torfaen, NP44 6TU
- Contact:
Hi Santacama
If the port timings you have given of 126 trasfer & 186 exhaust are correct all should work well.
However from what I calculated I beleive that with the piston coming to the top of the cylinder you should have;
126 main transfers 47.0mm from gasket face to top of port
123 secondary transfers 47.5mm from gasket face to top of port
115 boost transfers 49.0mm from gasket face to top of port
186 exhaust 32.5mm from gasket face to top of port
The cylinder head installed volume set @ 23.0cc for a corrected comp ratio of 6.3 to 1
This requires the cylinder head to have a recess of 1.5mm for the squish clearance.
Set the ignition timing @ 18 degrees = 1.86mm btdc
Check my calculations with a degree disc on your engine case as not all crankcases are the same.
Remember to use a PX125-T5 36t 4th gear so that the engine will pull 4th much better.
Best regards
Ian Frankland
Taffspeed
07794 003276
If the port timings you have given of 126 trasfer & 186 exhaust are correct all should work well.
However from what I calculated I beleive that with the piston coming to the top of the cylinder you should have;
126 main transfers 47.0mm from gasket face to top of port
123 secondary transfers 47.5mm from gasket face to top of port
115 boost transfers 49.0mm from gasket face to top of port
186 exhaust 32.5mm from gasket face to top of port
The cylinder head installed volume set @ 23.0cc for a corrected comp ratio of 6.3 to 1
This requires the cylinder head to have a recess of 1.5mm for the squish clearance.
Set the ignition timing @ 18 degrees = 1.86mm btdc
Check my calculations with a degree disc on your engine case as not all crankcases are the same.
Remember to use a PX125-T5 36t 4th gear so that the engine will pull 4th much better.
Best regards
Ian Frankland
Taffspeed
07794 003276
Ian T Frankland
Taffspeed Design Innovations
Mob: 07971 818693
Email: terrible.taff@gmail.com
Taffspeed Design Innovations
Mob: 07971 818693
Email: terrible.taff@gmail.com