Lotus Elan

FIA Appendix K

PostPost by: Greg Cozier » Fri Jun 06, 2014 2:08 pm

rgh0 wrote:Yeah similar rules apply here in my historic production sports car racing class that allow links to be added but springs and links to not be removed. So you see MGBs with 5 or 6 link rear end and a couple of extremely thin leaf springs there for decoration and rule compliance!!!

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Rohan


Ford Escort spring leaves were made of fibreglass, same as the Gp2 Capri RS2600 and RS3100.
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PostPost by: nmauduit » Sat May 07, 2016 1:38 pm

elansprint71 wrote:Is it feasible for someone who has a current (or even recent) set of FIA spec papers for the Elan to post them here (I have no idea how many pages this runs to).


planning to seek a period F HTP pass for my next project eventually, I have been sent the current version of form 127 and appendix K from the FIA in Geneva. They are .pdf files, 7.7Mo (37 p) and 2.5Mo (104 p) respectively, so unfortunately over the downloading size limit for the forum : one may download them from the links below, that may only remain valid 1 month after the last download.

form 127: http://dl.free.fr/gA0iniscT
appendix k: http://dl.free.fr/qRf3Za4oM

now begins the time of careful reading in hope to grasp the proper interpretation : any advice/hint will be highly appreciated, esp. on pitfalls or difficulties encountered recently...
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PostPost by: nmauduit » Tue May 17, 2016 1:29 pm

going through the form 127 to begin specifying the goals for my next project (period F racer), I end up more confused than I started :

if I read http://dl.free.fr/gA0iniscT (e.g. p 10, p 16) I see for instance
maximum valve lift 10.420mm (0.41")
maximum inlet valve head 1.562" (39.67mm)

with these limitations, is it possible to get the kind of performances one sees in action at the front of FIA period F races, or am I missing something ?
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PostPost by: rgh0 » Tue May 17, 2016 8:36 pm

mmmmmmmmm You dont suppose some people are bending the rules a little?

That never happens in racing :lol:

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PostPost by: elansprint71 » Thu Jun 09, 2016 1:11 pm

nmauduit wrote:
elansprint71 wrote:Is it feasible for someone who has a current (or even recent) set of FIA spec papers for the Elan to post them here (I have no idea how many pages this runs to).


planning to seek a period F HTP pass for my next project eventually, I have been sent the current version of form 127 and appendix K from the FIA in Geneva. They are .pdf files, 7.7Mo (37 p) and 2.5Mo (104 p) respectively, so unfortunately over the downloading size limit for the forum : one may download them from the links below, that may only remain valid 1 month after the last download.

form 127: http://dl.free.fr/gA0iniscT
appendix k: http://dl.free.fr/qRf3Za4oM

now begins the time of careful reading in hope to grasp the proper interpretation : any advice/hint will be highly appreciated, esp. on pitfalls or difficulties encountered recently...


Thanks so much for posting these two links. :-)
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PostPost by: nmauduit » Mon Dec 19, 2016 12:12 pm

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PostPost by: rgh0 » Mon Dec 19, 2016 1:32 pm

Some interesting data there especially the standard engine specifications for the B cam engine in homologation sheet 127 for which I have never seen good solid first hand Lotus data on before on such as the cam lift and timing

e.g. 22 / 62 timing and .350 cam lift

Also some inconsistent data which highlights where some of the myths have come from

e.g. Lotus have interpreted maximum valve lift in some of the sheets as the lift at which coil bind occurs and in others as the lift of the cam shaft lobe

I need to spend a few hours trying to put it all together so it makes sense to me. I am sure there are other gems buried in the data

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PostPost by: elansprint71 » Tue Dec 20, 2016 5:41 pm

Thanks again for posting these links.
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PostPost by: nmauduit » Tue Feb 20, 2018 6:46 pm

nmauduit wrote:Fia 2.0 has put the data online :


In case some of you may have not seen it, busy as myself tinkering or scraping, I've come across yet more goodies on the FIA site, including a copy of the May 64 "handling and maintenance notes for the racing version of the Lotus Elan" (S1) with all sorts of specs (including suspension settings p3) :

https://historicdb.fia.com/car/lotus-elan
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PostPost by: 661 » Tue Feb 20, 2018 8:07 pm

Interesting. That's bang up to date.
They've got the Andy Robinson cage on there.
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PostPost by: elansprint71 » Mon Mar 12, 2018 4:09 pm

nmauduit wrote:
nmauduit wrote:Fia 2.0 has put the data online :


In case some of you may have not seen it, busy as myself tinkering or scraping, I've come across yet more goodies on the FIA site, including a copy of the May 64 "handling and maintenance notes for the racing version of the Lotus Elan" (S1) with all sorts of specs (including suspension settings p3) :

https://historicdb.fia.com/car/lotus-elan



Thanks for posting!
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PostPost by: Davidb » Sat Mar 17, 2018 5:30 pm

Dry sumping approved in feb '66.
'65 S2 4844
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PostPost by: lance54 » Wed Mar 21, 2018 11:02 pm

I'm just pleased that in the states we have All-Steel Dry-Sump Twincams in our Racing Elans.

With sensible RPM they are just about unbreakable.

What I noticed in the FIA Homologation Forms in this photo...

image4.jpg and


Notice the two engines in the background. Both appear to have rounded corners on the cam cover and what appears to be a 2 piece intake runner.

This is like the very first Lotus Twincam. First seen in the press in Autocar June 1, 1962...

image1.png and


Also like the engine in Jim Clark's Lotus 23 at the 1962 Nurburgring 1000Km....the debut race for the Lotus 23.

image3.jpg and


Also notice the water outlet is on the intake side of the engine.

I wonder how many of these cylinder heads were created and if any exist today?
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