#Weber f16 emulsion tubes trial

032 gap, idle mixture screws 1 3/4 out, new modified airbox to eliminate taper over the #4 carb throat, hi flow K & N filter, new dizzy cap, wire, rotor with distrib service, static timing at 12 degrees BTDC.

#Weber f16 emulsion tubes trial

With trial and error/ refurb, my current setup has BP6ES plugs with. Breather tube from head to airbox venting to atmosphere. Most everything was off-incorrect cold ht range plugs with narrow gap, timing ,idle mixture, weak idle jet for 45DCOE, air corrector jet of 200, main jet of 130, carb balance, etc. Standard Weber head but I don't know if larger valves were used. C type single groove reground cams-specs unknown. The motor is 1700 cc (rebuild 20 yrs ago, forged pistons, electronic ignition-Crane, 45DCOE Webers with 36 mm chokes)-originally made 160 hp on dyno. Hello- thought I would share my experience with Keith Franck's VP(venturi pump) tubes which replace the emulsion tubes in the main jet assembly of side draft 40/45 Webers and are an evolution of his VF firecracker tubes with holes instead of a slot.įor background my 69 Elan was a mess when I bought it 4 yrs ago, running poorly, difficult to start, uneven idle, popping on overrun, etc.

Happy Bunny now and cannot wait to get back to the French Alps and chase motorbikes.įF has been endlessly supportive via email and I heartily recommend his NF tubes but be prepared to fiddle about a bit. It may not align with some of the charts I have seen but it works. I thought I would give you my final set up which is working wonderfully.ġ700cc engine with QED 420 cams, Distributor Doctor electric ignition and Webers jetted as follows.ģ4mm chokes - Main jets 150, Air correctors 185 and Idle jets 50F8 Remember I am the silly old fool who had a 3:1 CWP made instead of faffing around throwing money at a 5 speed. The car now goes, like I said before somewhere, like a greased weasel, pulls from 1000rpm in top if I am gentle and accelerates like an electrified cheetah!! I have a really good chum who is an engineer in the classic car business and between us we fiddled with jet sizes and have now hacked all the problems. It turned out that I had not read the instructions properly!! Anyway KF was very patient and steered me in the right direction and soon I was experiencing a LOT more power but still issues with rough running at steady throttle and jerkiness at times. I was impressed with the information on the Sidedraft website and took the plunge and bought them. I thought it might be interesting to recount my experience with Keith Franks NF tubes in my Elan S3 S/E. I've tried the NF and BP tubes and found both an improvement over the standard weber e-tubes - better and more consistent through the rpm range, though admittedly by feel and I have not dyno'd or tested AFR. Most of his recent work has been to try to make the BP tubes work well for medium and large chokes, in hopes of creating a single tube design. The BP tubes were specifically designed (recently) as an improvement over the prior NF (non-frothing) tubes for small chokes after he discovered that with smaller chokes while the NF ran well they did not respond to air/dry jets changes. I'll try to grab some side-by-side photos when I'm playing with it this weekend, but what you need to know if you decide to try his bits is that Keith is constantly experimenting, tweaking and further developing to try to make more predictable and efficient air/fuel mix and flow.

He sells through a 'WebStore', and I'm pretty sure that link is on the sidedraft central group site, though it may be embedded in one if the topic discussions. TBG wrote:Mazzers - yes but where do you buy them? DĪ link to his group is in the first post in this thread.