the vincent i have has a pair of phillips injectors on it in place of the amals. they aren't siezed or appearing to be damaged but are an unknown quantity to me. i googled them and found reports on them from the 60's but no recent info.
are they any good? they are on a B rapide engine with lightning pattern cams (from my uncles and my last conversation in the 90's about the bike)and an open exhaust. i will require a silencer for road use and figure this will affect their calibration and don't want engine damage from bad/uneven mixture strengths. i have one AMALMonobloc and if needed will trace a second for the sake of ease of setup as i'm sure a rough base tune is an easy possibility with carbs. but, if they are a good thing (which i suspect they were as my uncle wasn't a novice mechanically and owned the bike from 67 onwards and he replaced a pair of AMAL tt's with them) i'd like to know so i can at least start it in it's present tune then adjust to suit the back pressure of a muffler. thanks for your time, glen.
I'm no expert (I think you might struggle to find an 'expert' on them!) but the only reports I have read re the Wal Phillips injectors tell tales of non-existent tickover, reluctance to run on pretty much anything other than full throttle and a singular propensity to self-ignite. I think they were more suited to speedway bikes!
I am not a big fan of Amals (well not new ones anyway) but if you've still got the one that came off the bike, like you suggested, I'd be getting another and putting them back on asap, if you want to ride the bike that is!
You'll be much more likely to tap into the wealth of knowledge in the VOC etc where there will be loads of people running Monoblocs. I suspect you may be in a minority of one of you persist with the injectors!
i believe the Monobloc is a small one and thats why it and the other missing item were replaced with the tt's. would a pair of dell'ies or mikuni's from something big be an option if the injectors won't play the game? the report i've got claims better mpg,acceleration, top whack, etc.... but how conclusive the test was is subjective. was on a standard 250 matchless that phillips installed his part on then tuned. the bike had done a little more than 140 at one stage from dads recollections though with what fuel system i don't know.
A Wal Phillips injector is just a drip tap into a venturi controlled by a butterfly.
There's no way they were ever intended for anything except a drag racer (sprinter), a grass tracker, or a speedway racer. There's no way to control throttle response off-idle, or to make it idle ... they're made for applications where you slam the throttle open and leave it wide open until you're done, at which time you shut the fuel off and stop the motor.
I'd take 'em off right now and either keep them as curios, build a vintage dragster, or sell them for a pretty sum ...
righto. got that cleared up then. i'll try finding some suitable carbs. will have parents on either side armed with extinguishers when i try it's first start then will pull them off. thank you all for your help.