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Post by vespasco on Aug 27, 2014 20:13:38 GMT
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Post by henri on Aug 28, 2014 8:41:17 GMT
there for locating dowels gaz ,ok, H
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Post by shipscat on Aug 28, 2014 9:44:14 GMT
has anyone tried to register at the pinasco site i'm unable to get it to work
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Post by vespasco on Aug 28, 2014 17:48:30 GMT
The 8 holes are for 8 nuts to clamp down head apparently to combat potential leaks
*Edit:
Heres the info....
PINASCO 225CC-235CC 8 PRISONERS FOR VESPA
Finally is back !!! After a year the touring cylinder kit for excellence is back in a new form even more powerful.
After a big work of renovation and test, Pinasco has developed the first cylinder kit for Vespa 200 with 8 prisoners, new cylinder with bigger ports, new high turbulence head.
The benefits you can get from these new changes are more power and torque keeping the reliability and low fuel consumption, a more efficient engine and no leaks from the seat of the head, thanks to the upgrade with 8 prisoners.
In addition to the central spark plug 225cc version is now available the new 235cc matched only to the crankshaft “COMPETIZIONE” 62mm stroke.
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Post by henri on Aug 28, 2014 19:14:44 GMT
must be 4 through studs an 4 into barrell ,still got 2 dowels like use too, 12 n 6 oclock stud in photo ,thought 4 was "overkill" , an gaz dowels are to locate head accurate ,must be the new "high turbulence head" has to sit right to work, 225 on a standard crank, got to be a wide bore for that i guess , H
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Post by henri on Aug 29, 2014 23:00:02 GMT
yep . pure macigkery/trickery i reckon. H
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Post by vespasco on Aug 30, 2014 9:44:52 GMT
'high turbulence',,,is that what those cut outs are for inside the head?,,some sort of whirl wind magicery trickery What cut outs inside the head? The 225cc is on a 60mm crank 235cc on the 62mm crank 69.5mm bore which is 'normal' and about as big as you can safely do on a 200 lump. |
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Post by vespasco on Aug 30, 2014 10:30:06 GMT
I must be looking at a different photo as i cant even see an internal view of the head?!
*edit
Neither can i see any locating dowels, the closest i see is a recess on top of the cylinder , ala negative squish, that the head clamps down into, (using 8 prisoners)!! eliminating the need for any locating dowels.
Could someone post a pic/link of the head youre looking at as i cant see anything youve both described. (Maybe as im using my phone)? I cant actually find any pics anywhere about the new heads!? Not even pinasco site. Probably a big secret!?!?
Or am i going mad?!?!
Very interesting thing about the grooves etc though.
Never seen that on a vespa!
Im gonna have to research some more on that one!! Sounds very interesting.
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Post by henri on Aug 30, 2014 15:57:56 GMT
in photo its just 4 bolts barrel to head ,theres no case/studs thats why holes are empty ,an if ya zoom on barrel you can see dowels an shadows of em at 6 n 12 oclock , but there being cagey n not showin the combustion chamber of head , older vesp's tried something similar with deflecter pistons ,top shaped like a ducks bill , didnt work,
if you do the maths a standard vespa with squish at 1.5mm achieves the maximum swirl/flame front velocity you want , so not convinced cutting swirley patterns in a head will improve it,with low-octane modern petrol would prob make pinking more likely , maybe on a tuned race engine runnin on race fuel ,
reckon if this kit is anygood the secret is in the 7 transfers an piston cut-outs an port timing rather than a swirly head,which thinkin about it is giving me 1 .H
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Post by vespasco on Aug 30, 2014 20:03:40 GMT
Haha.
Im not convinced that cutting swirly hieroglyphics in the squish band would be of benefit. But ive never seen such a head. It would have to be machined in to produce equal pressure i imagine. But i have seen the odd shaped pistons Henri speaks of.
I think any grooves in the head would just attract carbon deposits and start detonating.
Are there any vespas with a stock squish gap of less than 3mm?!! Maybe the T5??
It could well be a slot in combustion chamber. I dont like those tho' because i dont think they distribute the heat into the head quite as efficiently. But again ive not actually seen one.
Hey gaz. Im helping a friend of mine build a tuned mini moto powered mobility scooter. If we can find a cheap engine!! Are there any good forums or websites with advice on tuning mini moto?
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Post by henri on Aug 31, 2014 12:15:37 GMT
check out "55mph scooter" on smallframe forum ,looks fun , theres quite a few on youtube , for tuning i'd guess the racer/scratcher forums as they use pit-bikes an always want to go faster,i def want a go on that lake, wanted to kit-up mums wheelchair but dad said no,
agree with the grooves attracting carbon ,an a vespa squish is suppose to be 1.5-3mm ,but all seem to come at 3mm, def makes a difference to drop it to 1.5 ,some go for 1mm but reckon thats on edge of safety , H
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