Scooterotica

Lambretta barrel,

exhuast 180 degrees
inlet 130
transfers 117

what do ya recon.

it will run, the inlet and transfers are a little low tho for the exhaust timing so it will be a bit peaky

think 130 inlet must be a typo,sure it's not 150?
personally i'd prefer more transfer timing,but that's just me perhaps.
fred

a bit off the piston might help then

ps this is for a straightliner

if you are going sprinting mate i would say those port timings are extremely conservative, even more conservative than maggy thatcher!!!

tarmac tickler wrote:if you are going sprinting mate i would say those port timings are extremely conservative, even more conservative than maggy thatcher!!!

can you point us in the direction of somthing a bit more Nick Clegg then

190 exhaust
130 Transfer
158 Inlet

Wouldn't be over the top for sprinting

an experimentl iron barrel going on the dyno at the run to the shires this weekend..

exhaust 202
transfers 150
inlet (forgot to measure it)
gear box gt200 46/15
will post results sunday

Jazzy wrote:a bit off the piston might help then

ps this is for a straightliner

a bit off the piston will help but it would be better to work the inlet so it has more port time area
widen it and lower the inlet but leave a few mm so the piston skirt covers the port id also go with around 165 withe inlet
trouble is gonna be getting the transres up to about 130 ish