Lambretta Crankshaft/Piston height/Conrod Length Explained
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- Опубліковано 15 лют 2014
- There's a lot more that I'd like to say on the subject, but this is a brief primer on crankshaft and piston variations for the lambretta and how they are used. There's many more piston conversions available too. I didn't go into port timings, that'll be a separate video. Hope this helps explain things a little bit.
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Honourable shout to MB. We'll done Sir!
This was really useful. Good explanation on difficult subject. A lot of info. Great stuff!
Good video. Thanks.
Do one on port timings please.
I think in this case, to avoid confusion, a consistent terminology is important. For pistons: high compression height and low compression height and for rods: long and short works but I prefer to use length in mm and the diameter of the small end in mm as some popular Lambretta tunes use pistons with 18 mm wrist pins while the standard pistons used 16 mm wrist pins. Rods that are used in Lambrettas: 107 x 16 (original) 110 x 16 Yamaha, 114 x 16 and 114 x 18 (Deanspeed), 115 x 16 Yamaha (as in your video), 115 x 18 (Rotax), 116 x 16 (original TV175), 116 x 16 (various "racing" rod kits from Europe), 116 x 18 (Wiseco Hot Rods Yamaha), 120 x 18 (Rotax), all of course depending on what piston is used and the tuning done to the cylinder. Are there a lot of Lambrettas in Pennsylvania? Good twisty roads over there.
Great video. Very helpful. Thanks!
blimey ! that was an excellent tutorial thanks.
i have been trying to piece together bits of information all over the net to make sense of this and you've done it in one video.
The only topic not covered was port timings .
TV175 barrels are very scarce. If I were to use a series 2 Li150 barrel (long) bored to 62mm (175cc) and a standard series 2 Li150 crank and fit a long 116mm conrod ( TV175 pattern) and an original TV175 piston (short) how would the ports in the series 2 Li150 barrel line up with the TV175 piston ? is this a feasible combination ?
Quick question for ya
ive got a 125 series 3 conrod and a tv175 series 1 barrell and head
i ordered a conversion piston for the barrell and it ligns up the same ports and such
and gives me perfect tdc and squish is 1mm
can i use this combo or do i need to install the 175 crank w it?
thx
cornfused
How much difference to torque/revs does the length of the conrod make? is it short conrod for high revs but long conrod for torque/mid range power?
Thanks for the vid. very helpful. Still learning. I just bought the bgm 195 racetour kit. What conrod and crank would yoou recommed? I just want a little more speed. Don't want to race.
Thanks
Crank mazzachelli road race. Use the rod it comes with...I say this because its cheap and reliable. My TS225 does high 80s mph. Sits all day at 65 mph...crank cost me £120 from Glasgow Lambretta centre...
dude use a SIP race crank 107 rod 60mm stroke . you will need to add a 1mm base packer this will give you more cc and about 6 degrees more advanced port timing ..... should give you around 2 to 3 bhp more .....
What transfer port duration do you aim for?
Lambretta upgrades Ltd. In the uk cheaper than MB
good afternoon .li 150 almentar cylinder piston that forced use.