Dell'Orto PHF32 upgrade to 36mm & manifolds in 40mm for 180?

[iLaverda]

I read a lot about the counterboring of Dell'Orto's PHF32 in this forum and in old articles about the Sulzbacher (... thanks Gert) tuning (1200 SC).

Does anybody has realization experience with the extension of the cross section and can give foto based support or recommend an address, where the job is reliable done? What else has to get changed at the carbs?

I am furthermore interested in manifolds with an external diameter of 40mm for the 180? engine. Laverda shark Andy has them listed in his catalogue but can't supply. Does there exist another place where to procure them from?

Thanks for your comments & hinds in advance
Dominik

 

[phil37]

Hi Dominik  - The 32 D/'Os can be bored to 36mm on a lathe - the counterbore to make sure the slides seat properly can be done with a special tool (see photos) - the seat for the needle jet holder can be done with a piloted milling type cutter. To make sure the backdrop of the slides clear the new 36mm bore - you can fit an adapter kit on top of carbs - Keith nairn (Laverdakeith on this forum) has my stock of them. - Hope you understand this - Keith may do job for you - but is very busy now - regards - Phil

 

[CLEMTOG]

you can buy the 36mm bore maniflds on ebay from a seller who has the name of elegog.
when I built my 36mm carbs I used three 36mm bodies from the 750 Laverda SF1/2/3, all other parts interchange including the slides.
CLEM

 

[lavgert]

Hi Dominik,
you mean Sulzbacher not Sulzberger. You can find Dellortos 32mm bored out to 36mm on every Sulzbacher 1200 SC (although not many around). Phil already told you how to do it.
I have a set of bored out Dellortos but in bad condition lying around. And I think I have some CNC made inlet stubs also, but which inner diameter are you looking for - 36mm? PM me if interested!
Ciao, Gert

 

[sfcpiet]

With the general condition of old, clapped out 32mm Dellortos, why bother enlargening them?  Total waste of time imho, as boring them isn't going to take away the worn areas and the sealing of the slide will only be worsened by the larger bore.  New instruments are available in 36mm and at least let you have a bit of fun with them before they're over the hill (again).  Other (better) option, and not much more expensive, is the swap to decent jap carbs...

piet

 

[CLEMTOG]

see item number
271157296699
on ebay
avaiklable in 32mm and 36mm
I have found that they are not 100% finished and one set I bouight needed about 6 thou taking off the stub so as to not risk a splitting carb body (easy done)
CLEM

 

[Jota Rob]

New ones can be bought about 20 miles from my house for a very good price (only slightly more than some jokers ebay them at), (3/4 of the price someone has listed a knackered set for)but you'll need a moderate amount of charm and to walk through the door of the building.

http://www.ebay.co.uk/itm/1982-1985-Laverda-RGS-1000-Triple-Carburetor-Carb-Dell-Orto-Dellorto-PHF-32-/271155089234?pt=Motorcycles_Parts_Accessories&hash=item3f221a4f52

 

[Dellortoman]

Holy crap! $935 for a set of second hand 32mm Dells 

Red should put the contents of his rubbish bin on eBay. Must be a couple of dozen sets in there.

 

[sfcpiet]

New instruments available here for under ?200 each.  As they are single carbs, a bit of work is required to make them into a triple set.  Apart from the linkages, they are then "as good as new".

piet

 

[bob]

I'm sure most of us on here have struggled at some stage to set up old worn out Dells.
I fitted a brand new pair of 36mm Dells to my Barcelona and was amazed at how easy they were to set up. Fiddling with mixture screws and jets actually has a meaningful effect instead of the vagueness you get with old carbs where you are fighting to compensate for worn slides and needles.

With old carbs you will only ever achieve an approximate setting. With new carbs you'll get precisely what you want.

 

[Jota Rob]

I was very lucky having the dyno centre within half hours drive of Dellorto UK, but it took us a good 4 hours to set the bike up, we had to change needles twice but that shouldnt happen with the standard or 36 mm set up.