Lotus Elan

Franck's BP emulsion tubes

PostPost by: SENC » Fri Oct 09, 2020 1:37 pm

TBG wrote:Mazzers - yes but where do you buy them? D

A link to his group is in the first post in this thread. 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.

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.

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. 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.

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.
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PostPost by: TBG » Fri Oct 09, 2020 3:01 pm

Thanks so much for your help. I have emailed him and am awaiting a reply. Seems a good idea. :D
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PostPost by: ericbushby » Fri Oct 09, 2020 3:18 pm

Thanks Henry, I had not seen that either. Much better lead than mine.
I wondered why Rob appeared to be unhelpful, sorry Rob.
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PostPost by: SENC » Sat Oct 10, 2020 1:45 pm

Keith's NF tube on the left, Weber F16 on the right. Keith's is made in 2 pieces in order to lift the fuel jet off the bottom of the well.

IMG_20201010_082854.jpg and
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PostPost by: TBG » Fri Nov 20, 2020 5:54 pm

I thought it might be interesting to recount my experience with Keith Franks NF tubes in my Elan S3 S/E. I was impressed with the information on the Sidedraft website and took the plunge and bought them. I fitted them and was very disappointed. Rough running no oomph and so on. 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 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. 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!!

Remember I am the silly old fool who had a 3:1 CWP made instead of faffing around throwing money at a 5 speed.

I thought I would give you my final set up which is working wonderfully.

1700cc engine with QED 420 cams, Distributor Doctor electric ignition and Webers jetted as follows.

34mm chokes - Main jets 150, Air correctors 185 and Idle jets 50F8

It may not align with some of the charts I have seen but it works. Happy Bunny now and cannot wait to get back to the French Alps and chase motorbikes.

FF has been endlessly supportive via email and I heartily recommend his NF tubes but be prepared to fiddle about a bit. D :D :D
Last edited by TBG on Sat Nov 21, 2020 10:07 am, edited 1 time in total.
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PostPost by: gjz30075 » Sat Nov 21, 2020 9:57 am

Not Famous Franks, but it is Keith Franck's emulsion tubes.
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PostPost by: TBG » Sat Nov 21, 2020 10:05 am

Oh I thought that they were one and the same. Sorry Franks. Of course I have been dealing with Keith. Good chap.
Have modified my previous post.
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