Lotus Elan

HypoJets and O-tubes on the way...

PostPost by: rgh0 » Thu Sep 26, 2013 11:48 am

Talk to Keith on the yahoo group sidedraft_central. He can give you the recommended starting settings for a standard twin cam using his jets and emulsion tubes and they will be an order of magnitude better than standard set up. Best thing you can do to your Webers. Made a huge improvement in my Plus 2S 130/5 :D

In my Elan I have spent hours on dynos to match the carbs to the engine developments I have done. I can justify that on a race car but hard to justify for my weekend fun car. On the Plus 2 I run a standard sprint spec engine and fitting Keith's modified jetting made a huge difference in tractability and smoothness

cheers
Rohan
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PostPost by: Johnfm » Thu Sep 26, 2013 2:14 pm

cheers all.

Email to Keith it is then.

I am going to tackle the carb strip/service kit myself shortly.

Will see how it runs with existing bits - then order and fit Keith's stuff - and drill that little 1mm hole in #4 butterfly...
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PostPost by: holywood3645 » Thu Sep 26, 2013 6:46 pm

I was following simonknee post on this topic with interest. Then he got married.... and they stopped
One things for sure, he will be back. That gets old after a while as well :shock:

James
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PostPost by: mbell » Fri Sep 27, 2013 2:30 am

I got a step up from Keith. O2 tubes and 20 thou hyper jets to run with 33mm chokes. Fitted 120 wet jets but also got 115 and 125 just encase.

I've not run it yet but I expect that he'll recommend the same for std big valve. If you have different sized chokes you may need a different set up.
'73 +2 130/5 RHD, now on the road and very slowly rolling though a "restoration"
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PostPost by: Johnfm » Sun Sep 29, 2013 8:06 pm

Cheers

I have the carbs on a bench at the moment - will measure stuff.

Will be checking cams too - but have no idea f it has big valves without pulling off the head.
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PostPost by: Johnfm » Fri Oct 04, 2013 12:57 pm

Re: sealing the chokes as mentioned by Simon - is there a thread on how to do this on DCOE2s?

How does one remove the chokes? I cannot see any retaining screw or similar. Is it an interference fit?
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PostPost by: Galwaylotus » Sat Oct 19, 2013 4:02 pm

I spent a lot of today between reading this thread and the garage checking my 40DCOE33s on the bench. It seems my throttle plates at zero turns on the idle speed screw are about a half transition hole downstream of ideal. I.m trying to get someone to get the endfloat out of my distributor and wait for the Powerspark ignition bits to arrive before I put everything back together and try it with what I hope will be an optimised standard setup. Once i have it idling correctly I'll do a proper (Keith Franck method) fuel level adjustment and install his Hypojets and O-tubes. Fascinating learning about all this and I'm hopeful that I'll end up with a smooth-running and reliable Elan!

P.S. One thing I've discovered that's a cure for old eyes is to take a good digital photo and zoom right in. It's amazing what you can see then!!
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Mechanical Engineer, happily retired!

'67 S3 SE FHC

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PostPost by: SJ Lambert » Thu May 11, 2017 9:06 pm

holywood3645 wrote:I was following simonknee post on this topic with interest. Then he got married.... and they stopped
One things for sure, he will be back. That gets old after a while as well :shock:

James



Holy HypoJets Batman, did everyone get married all at once?
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