casa ss200 vs Quatrinni 210

[Ballspeed65]

Well rule out the casa and the rb as they needs revs too get the most out of them, the quatrinni seems ideal but obviously more expensive.

Does the RB 250 not have a good spread of Power? Especially the Mono with 62mm crank and 116 mm rod.

[Ballspeed65]

Well rule out the casa and the rb as they needs revs too get the most out of them, the quatrinni seems ideal but obviously more expensive.

Does the RB250 not have a good spread of power. Especially the Mono with 62 mm crank and 116 rod.

[Fast n Furious]

Bottom end carburation can be lumpy on RB's due to their port timings. They do work best with a suitable expansion pipe and a 5 speed box.

[dscscotty]

Bottom end carburation can be lumpy on RB's due to their port timings.

I'd be looking at carb setting/jetting/pipe if there was any issues with RB at low rpm, a well set up RB has a very smooth, linear power delivery, especially if the pipe is used has a good power spread,

[Ballspeed65]

Bottom end carburation can be lumpy on RB's due to their port timings.

I'd be looking at carb setting/jetting/pipe if there was any issues with RB at low rpm, a well set up RB has a very smooth, linear power delivery, especially if the pipe is used has a good power spread,

What carb and pipe combination do you think would work well?

[dscscotty]

depends on which version of RB used, 20,22 or 25, also the 25 has a couple of variants relating to exhaust port configuration, duration's and cylinder length for increased stroke etc, had some great results with chisels-CST range, also pipe design, for a good touring set up on an RB250, maybe consider a vhsh 30mm dellorto (or a 34) and a cst 6 from chiselspeed 6, really nice curve, no pre power lull, got a new AF technigas here to do some dyno work on various versions of the kit, however the current situation means this is on hold, I'll try n post up some graphs,

[Ballspeed65]

depends on which version of RB used, 20,22 or 25, also the 25 has a couple of variants relating to exhaust port configuration, duration's and cylinder length for increased stroke etc, had some great results with chisels-CST range, also pipe design, for a good touring set up on an RB250, maybe consider a vhsh 30mm dellorto (or a 34) and a cst 6 from chiselspeed 6, really nice curve, no pre power lull, got a new AF technigas here to do some dyno work on various versions of the kit, however the current situation means this is on hold, I'll try n post up some graphs,

I've had quotes from AF regarding the RB. 225, 250 & 250 mono with 62 mm crank and 116 rod.

I'd be interested to see dyno results on the technigas. On a graph ive seen somewhere on line there appears to be a slight lull low down compared with the NK and another pipe. (can't remember which)

[dscscotty]

Here's an RB20 VHSH 30mm-Chisel pipe

[Ballspeed65]

Thanks dscscotty

is that CST 6 pipe?

[nickw]

It's a shame you are doing this now because Sticky is currently writing a book/manual about the different kits on the market, quote
'As part of the forthcoming Complete Spanner’s Lambretta Kit Book I’ve been dyno testing and fitting tons of cylinder kits. In doing so I’ve encountered a few anomalies that I’ll be sharing as YouTube videos to accompany and promote the book'.

Other books are available for those that read but not about kits.

[Ballspeed65]

It's a shame you are doing this now because Sticky is currently writing a book/manual about the different kits on the market, quote
'As part of the forthcoming Complete Spanner’s Lambretta Kit Book I’ve been dyno testing and fitting tons of cylinder kits. In doing so I’ve encountered a few anomalies that I’ll be sharing as YouTube videos to accompany and promote the book'.

Other books are available for those that read but not about kits.

Yes nickw

I saw that and thought exactly the same. But I want to get this sorted sooner rather than later and this book looks like it wont be out until late in the year

[nickw]

But I want to get this sorted sooner rather than later

lol know the feeling

[dickie]

You keep saying "Quattrini covnvertion" like there's more to do than with any other kit as far as I see it there's no more to fitting a Quattrini to fitting any other high powered kit

With the Quattrini I need to have a new crank which takes the price up.
The casa can use my existing crank. (AF race)

I'm really surprised that it costs an extra £2000 to swap your crank. A good crank is circa £250, let's say an extra £50 (pessimistic) for seals and bearings, plus an extra 3 hours labour works out at about £570 an hour. Are you getting quotes from a furloughed football player?

Seriously, I'd be shopping around. Personally, I'd expect no more than an extra £500 to change your crank and you can possibly recoup some of that by selling your current crank.

[MickYork]

plus the cost of a bespoke Quattrini exhaust …… £500 ?

[bike grim]

Sip do a suitable crank For Quattrini (Either option 58 or 60 x116) for £230 and BGM, Ron Moss/Avanti or Chiselspeed and a few others do exhausts all in normal price range (Eg CST10 £350) Also TSR and Any RB exhaust apparently work with minor alteration.

[Ballspeed65]

I think I'll get a couple more quotes for the Quattrini option.
If it still comes out at around the £3,000 mark, I think I'll go with a complete Ts1 or RB engine.

[Warkton Tornado No.1]

My advice with any of the options stated would be to consider the engine builder & make sure it is somebody that you can trust.

That said, it could be relatively simple to achieve a working engine simply by fitting the components yourself, as long as you are methodical & should any doubt arise, there is this Forum. I would imagine that in your shoes, many of us would derive a fair amount of satisfaction from the build, but if it is something you would dread, then so be it.

The choice of crankshaft would be my starting point, & the longer the stroke, the better IMHO. A mate of mine has even acquired a 62 mm Tameni recently & I have yet to hear of anything adverse. His looks as though it has sufficient 'case clearance, but it needs checking. Then again, your existing crankshaft could be rebuilt. A good crankshaft builder is worth talking to @ this stage, as they are likely to be aware of options some of us are not. Another mate of mine acquired a crankshaft built by ProPorting & try as I might, I could find no fault & it runs extremely true & smoothly. Of course, "other crankshaft builders are available......."

Then it would be a case of very carefully 'dry building' the top end to achieve desired squish, compression ratio & to check port timings 'out of the box' & again, if any uncertainties arose, there is this Forum.

Matching of the transfer ports to the 'case can be done @ a later date if need be. Likewise, the exhaust port, if required.

Don't be too heavily influenced by what is 'de rigueur' when it comes to ignition or carburation, but I would imagine a light flywheel would best suit all of the kits mentioned, though probably the Quattrini more so, with it's swathe of torque.

If you are tempted to have a go yourself, then a documented build with images on this Forum will almost certainly guarantee your success.

Good Luck, whatever you decide.

[Ballspeed65]

Thanks WT No.1
Your advice is appreciated. I will most probably buy from a reputable dealer.
I would like to have a go, but I am a little impatient when it comes to trial and error. I'm one of those people that if shown physically how to do things I usually catch on. However if I am doing it from a book I don't like to go into the unknown if the consequences could end up expensive or dangerous.

[dickie]

I dont necessarily think that £3000 is ott, it just depnends what's included.

Just be careful that you're comparing like for like. for instance does one include new carb and pipe, but not the others?

[missing lynx]

As above, a big block rb or ts1 from scratch will cost you more than £3000 in parts then there's the build cost on top where as a quattrini built on your existing case at £3000 seems a good price