 |
Page last modified 19:49, 25 Oct 2011 by internetscooter
Pinasco 215From $1
Table of contents
Image from Pinasco 215 Info Also see Pinasco Lab Day where we fitted a couple of Pinasco kits and took photos. Comparsion to Standard
Below we see a dyno hp comparison between a standard PX and a Pinasco 215 with a Sito plus exhaust (Scooter:Lab Rat). The Pinasco has been bolted on but the ports have not yet been matched, more power should be expected with port matching. The configuration also includes the air filter hole as recommended by the Pinasco install instructions. In this instance the Pinasco increases rear wheel real hp from ~8.7hp to ~12.6hp and gives a good broad power range with extra RPM to wind out to higher speeds (graph is for 3rd gear).
Good PointsThe Pinasco kit is a very easy install (see Pinasco 215 Installation) and gives instant and reliable power. Ports can be matched for more power, however the kit can be fitted to a standard scooter and removed at a later date (i.e. changes can be easily rolled back to a scooter under warranty). The power is not reliant on high revs and makes for a good performing engine around town and out on the highway. Bad PointsThe kit has been altered over the years and isn't to the original design. Most notibly the piston is not the original and is adapted from another kit, which means that the Squish Band is all wrong at around 3mm (where ~1mm would desired). The excessive clearance has lead people to believe the kit was designed for a long stroke, however if a long stroke is fitted the compression is too high and spark plug clearance too low. More performance can be gained by reshaping the head (which is what Worb5 do). The kit is also probably designed for a Vespa PE (not PX), this would explain why the port does not match up exactly and there is not enough clearance for the starter cog. Both problems can be fixed, however it would be a lot nicer if these issues were fixed in a newer version of the kit. Good MaintenanceHere are some tips to keep the Pinasco running smoothly:
Tags: (Edit tags)
Files (4)
Comments (3) |
||||||||||||||||||||||||||||||||||||||||||||
Powered by MindTouch Core |
|||||||||||||||||||||||||||||||||||||||||||||
I've seen many comments through an internet search where people are indeed advocating a longer stroke, so your comment here about reshaping the head is very interesting to me. I am confused somewhat, however, about the Worb5 head [ http://www.worb5.com/shop_de_7/ ]. My admittedly imperfect knowledge of mechanical German leads me to understand that the squish band is 2.1mm with the Head gasket, and 1.6mm without the Head Gasket:
"Der Brennraum wurde komplett überarbeitet um ihn auf dem 213 er Pinasco Zylinder fahren zu können. Die tatsächliche Quetschspalte ist ca. 2,1 mm MIT 0,5 mm Kopfdichtung und ca. 1,6 mm OHNE 0,5 mm Kopfdichtung.
The Combustion chamber was completely revised in order for it go with the Pinasco 213 cylinder. The actual squish band is around 2.1 mm with the 0.5 mm head gasket, and around 1.6 mm without the 0.5 head gasket."
Aren't these gaps still too large to give good compression? (Can you get by WITHOUT the gasket?) And if these gaps are too big, then isn't this "completely revised" cylinder head by Worb5 useless (and this despite Worb5's caustic comment on the stupidity of the Pinasco supplied cylinder head: "Why this head has such a big stupid squish edge, only Mr Pinasco can say")? It seems still to need its own profiling! Interested to hear other people's views, most especially those who perhaps have used the Worb5 head.
http://www.vespalabs.org/User:Internetscooter/In_Draft/Squish_Band
The squish-band tolerance is important for concentrating the combustion around the spark plug and keeping the piston cool everywhere else.
The Pinasco has the problem that it has changed piston since its original design and therefore it sits a little lower than it should. It doesn’t actually reach the top of the cylinder. That is why it has such low compression, big squish-band gap and a long-stroke will fit in. The Worb5 head addresses the problem by reducing the volume to increase compression.
I would use the 0.5 mm gasket Worb5 recommend as maybe there are issues with the height of the spark plug or maybe compression would be too high without it. I know of someone with the Worb5 head and they have had great experiences with it (though they aren’t on Vespa Labs). Also look at the size of the squish-band in diameter; it’s not that big so an extra 0.5mm might not have much impact anyway.