Lotus Elan

Vegantune engine info

PostPost by: Mali » Fri Nov 23, 2018 7:57 pm

Hi i wounderd if anyone could help in identifing what engine i have fitted to my se3 1968 elan se
I was told when i bought it it was a vegantune and it has vegantune stamped into the front waterpump houseing.
There is no letter L benind the n/s engine mount it has a twin cam head and the engine number is
701M6015EA ?
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PostPost by: types26/36 » Fri Nov 23, 2018 8:14 pm

The L is behind the o/s engine mount (carb side) but the 701M is just a casting number (the last blocks cast for Lotus T.C.'s.) I'm afraid it wont help to I.D. the Vegantune engine.
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PostPost by: nmauduit » Fri Nov 23, 2018 9:48 pm

I'm rebuilding a Vegantune engine, I believe they offered a range of preparation going from stage1 (possibly something like blueprinting) to maybe stage10... I had a form listing briefly the different stages, I'll try to look it up.

I would think that for the lower stages the preparation was rather mild, and based on the engine provided by the customer.

The tag on the cam cover looks like that :

img-20130915-00759.jpg and
Vegantune engine preparation
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PostPost by: Mali » Fri Nov 23, 2018 9:54 pm

Thanks for the replys its not the original engine as i got its original engine with the car but the head as had a unsucsefull repair so i think the engine must have bee purchesd outright from vegantune ?
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PostPost by: billwill » Sat Nov 24, 2018 1:55 am

Vegantune's own design has no internal timing chain it has external cogged wheels and a cogged rubber timing belt (like most modern engines).

If yours has an internal chain it is probably just a partly tuned variant of the Lotus/Ford Twin-Cam engine, done by Vegantune of Spalding.
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PostPost by: nmauduit » Sat Nov 24, 2018 10:03 am

billwill wrote:Vegantune's own design has no internal timing chain it has external cogged wheels and a cogged rubber timing belt (like most modern engines).

If yours has an internal chain it is probably just a partly tuned variant of the Lotus/Ford Twin-Cam engine, done by Vegantune of Spalding.


Mine certainly was not a highly developped unit : standard big valves, ports smoothed and chamber polished but not significanlty enlarged... camshafts had been reground (I have not identified the profile) and were timed specifically by redrilling the sprockets (standard chain distribution). Engine and head were painted in the "attractive hammer finish blue" (though some of it flaked away when I cleaned the components...)

here are some documentation I had gathered :
p1030291.jpg and
Vegantune leaflet

2007110811459636536stp60613.jpg and
Vegantune list of preparations

p1030292.jpg and
Vegantune stages

p1030293.jpg and
Vegantune stages end

p1030295.jpg and
Vegantune Stage two rally
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PostPost by: billwill » Sat Nov 24, 2018 9:57 pm

As far as I know, George Robinson started Vegantune by improving Twin Cam engines and repair/renovation of Lotus cars.

They did a complete renovation of my S3 Coupe in 1982 and again in 1983 (after I has a carb fire).

At some stage they developed their own version of the twin cam as I described above. It was called the VTA engine (I think).

Then they went on to develop an improved Elan called the Evante and spun off a new firm called Evante Cars Ltd.

Alas (as far as I know) it was both a bad time for a new sports car and the backers 'meddled' too much and Evante cars went bust taking Vegantune (Spalding) with it.

The Name and some of the resources were bought by a small motor firm in London and Veganture was reborn in Finchley which later moved to Borehamwood, but that too went bust and the name is currently owned by a member of this forum, but he hasn't been on-line here for ages.

...
Rob Morley , who used to be the main engine mechanic at Vegantune Finchley had left before the bust and operates as Protune Racing Ltd in Potters bar. He knows lots about those Vegantune engines. I still ask him to do any of my tricky engine work.
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PostPost by: tvacc » Sat Nov 24, 2018 11:10 pm

I really don't know where my car fits into all this. All I know is the motor very clearly has a Vegatune cam cover on it. It I pretty much a standard TwinCam, It has cams, bored out to 40 over. Been that way since I bought it in 1986.

I have freshened it up 3 times with new rings and bearings but it has been very resistant to wear and strong. one time I just did not know how the Accusump worked and I lost oil pressure at an autocross at a Lotus Owners Gathering. I put in new bearings after that. Then when I bought the car back in 2004 from selling it in 1993, I went through the motor again as I needed to change the waterpump (put on a Bean cartridge front cover) so why not check it out and refresh it.


My car was a running chassis from Spyder, with the Spyder guys in the USA (Lee) putting a body on it in the early 80's.


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PostPost by: nmauduit » Sun Dec 02, 2018 4:34 pm

here are photos showing the shade of blue the Vegantune engine was painted in, head before cleaning and block during reassembly (head is due tomorrow from the machine shop, I'm not sure how much of the paint will remain... )

p1050328.jpg and
Vegantune head painted "attractive hammer finish blue"


p1050342.jpg and
Vegantune block painted "attractive hammer finish blue"
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PostPost by: Craven » Sun Dec 02, 2018 5:58 pm

Very characteristic of Vegantune, camshafts turned down between the lobes. Why did they do that.
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PostPost by: nmauduit » Sun Dec 02, 2018 6:10 pm

Craven wrote:Very characteristic of Vegantune, camshafts turned down between the lobes. Why did they do that.


I have not measured the profile, the lift is about 9mm iirc : will replace them with Q420 cams.

Also the sprockets where drilled for a specific timing (will replace them with adjustable sprockets)
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PostPost by: billwill » Sun Dec 02, 2018 8:18 pm

Just for interest, here are a couple of pictures of a Vegantune VTA engine.

vtenginea400.jpg and
VTA engine


vtengineb400.jpg
VTA engine
vtengineb400.jpg (65.09 KiB) Viewed 246 times
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