Dellorto PHVB Carb Breakdown - Do you need one? Which Tuning Parts To Buy
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- Опубліковано 6 лип 2024
- www.scooterstreet.com.au
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In this video we discuss the Dellorto PHVB in depth, including what kits and parts are available, and what parts you may need to fit and tune a PHVB on your scooter! - Авто та транспорт
I am thinking mounting that 22 PHVB on my Piaggio Zip Sp it had an 12mm stock carb and i upgrade it to an 17.5mm phva and a 70cc stage 6 streetrace kit, with the 22 i hope to get more response and performance
You certainly will, you should consider upgrading the cylinder in the near future.
I have a gilera runner 50cc not planning on putting a 70cc but i saw a sale on a 19mm carb should i get it or is it too big for a 50
Keep your money, don't buy the carby unless you go for the 70kit. Have a party instead and shout all of your friends🥳🥳🥳
I love the PHVB 22mm on my Piaggio Hexagon LXT 180 M06 engine, originally it had a PHVB 20.5mm with a 90 main jet and a 45 idle jet, when I changed the 20.5mm carburettor for a 22mm, all I had to do was replace the 95 main jet for a 90/92 main jet.
Did the 20.5 originally have a 95 MJ?
Did the 22mm Carb have much increase over the 20.5 ?
@@scooterstreetau The 20.5 had a 90 MJ originally and a 45 idle jet, the 22 had a 95 MJ and a 45 idle, I can't say that the difference between the two carburettor alone is noticeable because I also installed a stainless steel downpipe, lightened flywheel, and some other parts simultaneously, but I noticed a difference in engine temperature, I suspect that the 20.5mm is on the small side for a 180cc engine that is rated at 20,4hp.
@@frankrommerts8447 Wow, Great!✌️
Whats your opinion on the Polini CP carbs?
We have never had the carby in our hands, from the info we have read and the way they work, they look pretty good and we would like to try one.
Hi, I have an old phbg 19 on a 70 MHR. Make sense to change it with this PHVB 22? Somebody said that phbg is old style (technology and philosophy let's say) and phvb it's more modern. Sounds right the concept to you?
PHBG run Manual choke with air intake 32mm diam. Threaded for trumpet end and different types of manifold connections to suit different models.
PHVB run Auto or Manual choke with air intake 39.5mm diam. With 29mm diam. elastic/rubber manifold connection. I prefer the PHBG. or PHVA with Manual CK.
www.dellorto.co.uk/product-category/dellorto-motorcycle-carburettors-parts/complete-carburettors-dellorto-motorcycle-carburettors-parts/
I'd like to know, is there a diameter difference at the airbox end of the carb? Reason Im asking is, that I would like to run my stock airbox with my Aprilia SR50R and with 70cc sport kit, a bigger carb would give it a little bit more torque.
Yes, the larger carby has a larger diameter. The stock carby intake OD is 35mm. The PHVB 22mm carby the intake OD is 40mm so no it will not fit the stock airbox without modification.
@@scooterstreetau Do you know if theres an adapter to fit the stock airbox to, lets say a 21mm dellorto? I really like to keep my stock airbox, not a great fan of open ones.
@@EinarLerschen We also agree with keeping the standard air box😎. We use a snug fitting rubber connecting hose to join the carby and clamp it firmly, at the airbox end cut, retro fit and seal it permanently to the air box outlet, no air leaks.👍
@@scooterstreetau Thats what I thought that there are now "plug and play" solution. Thats kinda odd since the advance of a closed airbox are obvious. Finding a correct rubber hose for me is a nightmare since my local "rubberdealer" is well known for his customer service. If I walk there that I need a hose with these outer and inner diameters and it needs to be this long.... well I can vision the conversation and the end result is me not buying anything :D
@@EinarLerschen 😂, ok time to get creative. Use an old vacuum cleaner hose or something similar. We have a hardware store and we can source parts from there too. Clear hose, black hose anything you can get your hands on..
hello, I have a keeway fact evo 50, it reaches 72km / h as standard, I have this configuration in mind, the yasuni r, malossi multivar variator, and change the carburettor chewing gum, if the weight of the standard rollers is 4.5 grams aue Weight would be ideal, and later I plan to put a 19 allpro on it, and a 70 cylinder. thanks
How fast can it go with the First configuration
There's far too many variables to give you an accurate number, but I would expect roughly 85kph - 90kph if its tuned correctly.
@@scooterstreetau Thanks!
@@xaff4414 👍👍
How about Dellorto PHBL 26mm for 70cc,What do you think of it?
We don't have a lot of experience with the PHBL specifically, for 70cc cylinder 26mm sounds too big. As a gauge, the Malossi RC-One 70cc only comes with a 21mm carb - which is one of the highest power 70cc available. Our experience has been that if you go too big with the carb, you lose torque, and it becomes very difficult to tune. There's only some much air and fuel you can jam into a 70cc cylinder. Maybe with a 94cc the 26mm would be ok.
@@scooterstreetau Okay.Thank you sir for the info you provided.I do appreciated it.
@@jamilcarmelo2945 🤗👌
Bought this kit for my aprilia sr50. the 22mm carb comes with a 78 main jet. Stock is the clip on the second clip from above. You need another inlet manifold from malossi with 28mm connection(€45). my experience: I bought 3 sets of polini main jets from 60-120 to adjust this carb. it took me a lot of time to find the right jet. The airbox rubber doesn't fit 1 to 1, you need a rubber 5cm with a id of 40mm. At this point you have to be creative. Driving experience: my 70cc mhr runs way better on the 17.5mm carb, this one doesn't make high rpms, but more torque. And is uses a lot of gas
Thats right, it requires a 28mm intake manifold. We supply one with our kits as well as some simple work arounds for the airbox tube connector. It sounds like you may have a tuning issue there, we have had fairly extensive experience tuning this carb with Malossi sport, MHR Rep and MHR cylinder kits and have always experienced a fairly significant power gain. Carb tuning can be tricky, we have found most of the time a carb is very difficult to tune its because of a setup issue somewhere else on the bike (eg, wrong exhaust for the setup, ect). For power and tunability, the PHBG is a more desirable carb. We usually recommend the PHVB for customers who are steadfast in wanting an auto-choke.
@@scooterstreetau thanks for your reply. I bought the maloss 22mmi after watching several videos (and yours 😀 ) i run the mhr replica 70cc. I ended up with a 104 mail jet, air screw 45degrees open needle clip on the 4th clip from above. It was hard to find the right setting tested endless. The needle is so sharp, every time i changed it, i had to change the mainjet also.
@@peter0139 Sounds like a good setup. Regarding the needle, you shouldn't need to change the main jet when you adjust the needle. The main jet needs to be tuned to full throttle only. Once its set, the needle must be tuned totally independently of the main, purely to clean up the mid throttle range. You can get an upgraded diffuser for the PHVB which allows you to run W needles, for which there are many different tuning options. Depending on which PHVB you ordered, you may find the Pilot jet size is off for your setup.
@@scooterstreetau found i had a crack in my intake rubber. so bought a new malossi one. changed the mainjet to 118 and it is much better now. Still in testing fase, wainting on my polini jet kit 120-140 :)
@@peter0139 Nice work👍 keep on updating us.