36mm Dellorto settings for a race bike

Jota Rob

Jota Rob

Hero member
Location
England
Hi

I dont consider myself an expert on PHF's although I do currently have an old set of 32 with the early female fitting  Im planning on making fit a set of 36 mm dells to my 14441144cc (thanks Steve/Gert) motor.

As they will probably  be new, I would like to know:

1/ What laverda's they were fitted to
2/ Is the body the same size as 32's?
3/ What the std settings, slide, needles, needle jet, main/pilot jets etc were?
4/ Any  deviation on modified motors (obviosuly there are but anything more than jets) ?
5/ Any experience on balancing  these in cable format, ie without the lever actuation adaptors fitted, ie smaller models, moto guzzis, Ducatis etc?

Many thanks
Rob
 
Hi Rob - The 32 and 36mm bodies are almost the same - so 32's can be bored to 36. Keith has got some special kits i sold him that enable the slide's backdrop to clear bore at full throttle. Jetting etc  - std used 60 series slides - AB265 needle jet - 145 (debateable) main jets  - pilot jets from 55- 65. Can't see any problem with cable pull balancing - maybe problem if using 3 into 1 cable - may need a long trifurcator. I used to use around 160 ish main jets in my 1999 racer - but todays fuels would require different I would think. i also always used carb extensions flush fitted in back of carbs - Probably best with 38 or 40mm at your eng. size - but would add expense of course. i presume the BEARS regs would require original type carbs? - Regards - Phil
 
Hi Phil

Well I've learned already a new word, Trifurcator, you hit it on the nail. I already plan to make that once I've learned how to spell it !

I already run RS38's, PHM's are a possibility but in the interests of harmony, I shall go with PHF's. I wont be boring out the 32's, as I dont want the old type fitting.

Presumably the slide would clear a new standard PHF36 or does it use a different slide because of ?
 
Phil put 150 mains in my 36mm bored out carbs years ago still there.Not a race bike though!
 
Hi rob - yes - not sure if "trifiurcator" is a real word - but I know "Bifurcator" is!!. The 36mm bodies have an extra few mm at the top (under the top cover) to allow for the extra clearance. If bob reads this - i think he has a photo of what i'm talking about -  Why not save a few bob and make adaptors for rubber mounting - similar to some of the 500 cc series i seem to recall ? - or is room behind carbs a problem? - regards - Phil
 
.... 1444 ccm - I can't believe!

Sulzbacher Laverdas often came with 32mm Dellortos bored out to 36mm - pilot jets 60-65, main jets 165-195.

Ciao, Gert
 
Yes...should have read 1144 ...doh
I hope I wont be running 195 jets Gert, I run 130's in Mikuni Sizes, but Im not sure how the numbering system works, I dont think the jets are interchangeable unfortunately.

Phil, I have a space issue, as you know the spine tapers down towards to the seat and with the extra length, they aint going to fit, not even nearly.. Conversely mikunis with short stubs can sit quite close to the block.

Cheers Rob
 
Had a Harris 3;1 on my Jota once. Stevio threw away the Harris baffle and fabbed up a Jota end cap on it.
Needed 165s or it couldn't pull the cock off a chocolate mouse.
Went back to a standard system pronto.
 
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