Dirty Scooters - Lambretta Li 150 series 2 restore and 64 GL malossi 221

this blog is a record of my scooter projects. The Dirty Rocket is finished for now, and I am about to begin restoring a '58 Lambretta Li150 series 2. The Dirty rocket started out as an attempt to build my ideal scooter from a rusted bare heap for as little money as possible. (The frame is a '57 VNA) now a 64 GL frame. TO FOLLOW THIS CHRONOLOGICALLY, START FROM THE BOTTOM OF THE PAGE... AND Please leave comments/ tips/ warnings!!!

Wednesday, July 26, 2006

My ear can't tune it... but a DYNO MIGHT

I sort of gave up on dialling in the carb properly. I settled on a 130 main, stock everything else. and a slightly lean idle.
Last weekend I went along with some clubmates to a motorclycle mechanics to put their scooters on a dynomometer machine. This gave them a printed graph of the power their engines produce at different rev ranges.
In the end i did put my scooter up for one run. While I manage to achieve .2 hp more than Pauls pinasco packing PX, the usefulness of the HP at 800 rpm is only really going to benefit me when I am really showing off, or trying for 120+kmh.
Considering the engine is destined for a 'sleeper' '64 GL frame, I'd consider lowering the powerband somehow to increase torque and improve two up riding.
Having a figure put on your motor has an interesting psychological effect, causing me to go home and re-install my fancy tuned pipe (SIP performance). I had this on the stock motor, but it really was for unleashing high rev power so I put it aside until the malossi kit was broken in. 1000km in, and she's ready to go.

GOOD GOD WHAT A RUSH.
The pipe unleashed a monster. I rode home thinking 'there goes another bunch of torque..boo hoo' and got it up to where I would normally change gear. There was a change of tone, almost a crisp cracking sound, and the thing just took off like a bedford van MRT has just installed Nitreous oxide into while being locked in an enemy garage... I digress..
WOW not necessarily my goal to make the powerband stronger at 7500 rpm, but definitely a result. I just want to get back on the dyno. It is kind of like a weigh-in for fat folk on crash diets.

On the Dyno graph you will see a blue line (Paul's PInasco 225) and a red line (my malossi 210 - pre exhaust pipe).
Notice at the handy rev range of 4000-6000 he has about 1.6HP more.

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