What's the difference between a 24/24E and 24/24G?????

[kidda]

What's the difference between these two carbs?

[vespasco]

I think ths has been mentioned recently some where on here...try a search..

Off top of my head
Venturi is shorter
Air filter is taller
Jets are shorter
Different slide
If its going in pre p range chassis check for clearance

[sime66]

..........and a different shaped outlet, isn't it?, for the odd inlet on the cases. Take a look at BigD's threads; he spent some time looking into the 24/24g for his T5 last year - where is BigD anyway?


Cancel that - I'll leave it there while I check, but it's the carb box that's different, not the outlet - I'll be back......................


..........yes, it's just the box; have a read here though, I can't be reading it all again now, but you might pick up something useful:


vespa.proboards.com/thread/4389/carb-box-leak

[kidda]

Nice 1 fellas I'll check see if it fits

[mickymidas]

Isn't the G for a T5 and E for a P range ? only slight but subtle differences, & air screws are different diameter

[henri]

yep g's for a t5 , theve a different shape to venturi/inlet i thought , H

[sime66]

They are for the T5, but it seems that a 24G can be good on a kitted scoot to; SIP says this:

Their shorter intake duct helps the throttle response of the engine and makes the SI carburettors the first choice for rotary valve engines. With an SI and the corresponding peripherals, over 20 PS are possible at the rear wheel, their cooling capacity is rather limited, however. For this reason, it is better for cylinders under strong thermal load to be driven with a bigger carburettor.

In addition to the SI 20.20 for the smaller PXs, we also offer the SI 24.24 carburettors from DELL'ORTO. These are not only used as a spare part for the PX200 they are also a decent and effective upgrade for 125/150cc models with tuning cylinders. The SI 24.24 G on the T5 has an even shorter intake duct and is configured perfectly for the 12 PS 125cc T5. Therefore this carburettor is also a popular tuning set for the 166-177cc.

They are both dia24 outlet, and it is the transition in the carb box that is specific to the odd-shaped inlet on the T5 cases. To get a good transition through the box it needs a bit of fettling anyway, so although they aren't identical, and without checking one, it seems that a 24G would fit and might be a good idea.

It also occurred to me, vespasco, that the air filter is deeper and so has a biger surface area, whch might help your air filter bodgery - if it still fits inside the carb box, which it probably doesn't with a 24E.

...that'll do; just pondering over the morning coffee.............

[kidda]

I've got a 20/20 on a PX125E and just brought a 24/24E,so will this fit or have I got the wrong one?cheers

[henri]

they are a recommended swap onto a p range but only with fettling on the transition from carb to box to inlet on cases , am not sure but memorys saying the filters the same as a p200 , bigger than a 125/150 one ,so with shorter/stumpier carb would fit in vespaco's rally a tad better maybe , the carb box an lid would be same but filter would have a larger area to breathe from , H

[sime66]

...that's sort of what I meant - the bigger filter might help vespasco, but only if the bigger filter still fitted in the box with a 24E, which is the bit I doubted. (the bigger filter fits with the shorter body of the 24G).
They all need fettling, but the box for the T5 has that wedged transition like this:



....so the outlet on the 24G isn't a problem, other than the normal fettling.

I hadn't realised the jets were shorter, but it makes sense that they would be.

[henri]

kidda , the 24/24 will be a straight swap for ya 20/20 , only fettling required if ones a pre-mix carb n tothers a auto lube , but on a stock 125 the 24/24 isnt going to give much more mph ,but will drop ya mpg , H

[vespasco]

Thanks chaps.
I have already looked into the T5 carb, (aswell as other bigger carbs) and it would give me the same problem with clearance on the Rally chassis.
I also remember i would have come across such problems as jetting...dialling in/changing jets woud be a pain as they're all different for the T5.
I also was advised that the si26 is not so easy to dial in, so again, i stuck with the si24.
Ill dig out my notes and find out exactly why i didnt go for a T5 carb..i know i definately looked into it.


Ive also seen recently seen a bigger air filter box top cover, to allow even more air in there, i think by Pinasco? Anout €50!!! But again not enough clearance on the Rally. Thats another reason for me sticking with the si24...(now si26)

If you were going to convert from stock si24 to the T5 carb (and filter etc) you would not have to mod. your air box, as the venturi will still be 24mm, so youd use the same box.

They will all physically fit but are slightly different.

Im sure people must run si24 on a 125. Not sure what jetting tho' and tbh, if its still stock then im not entirely sure how it could be much better than a well set up si20? Would be interesting to find out if it drops your mpg then happy days

Do check your gaskets and carb box to cases as they may need opening out/matching to suit the bigger 24mm carb.
Check the large hole on the bottom of the air filter also suits your carb. Ive seen some filters with a smaller hole than the venturi!!?
And of course, you can also drill the holes in the heart shape recess if they're not already