Author Topic: Lotus Europa 16V Gordini  (Read 41107 times)

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Offline Mecky

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Re: Lotus Europa 16V Gordini
« Reply #195 on: Wednesday,June 29, 2022, 09:01:16 AM »
I think you can “under-drive” the alternator and get it turning much slower by fitting a larger alt pulley.  Don’t really need that much charging.

Silicone hoses are slippery.  Rubber holds on better.  Does your connection have a retaining bead?
I have 13.9 V without light, fan, wipers and that stuff. With every consumer, the voltage goes down by 0.2 or 0.3 V. That's why I tried to keep the alternator revs at the original level. Most important consumer of electricity in my car is the electric water pump. But maybe it's not a bad idea to lower the revs a bit.

Regarding the retaining bead, it used to have one, but I had to cut it, because it came too close to the camshaft pulley. Now, I will add one again on the shortenend tube, that's for sure.

The Europa Twin Cam came 2nd in his class behind an Elan, which is another 6 seconds per lap faster. That's almost insane. But both these Twin Cam powered cars are running bigger bore (or stroke?) engines with 1700 cc.

Offline Mecky

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Re: Lotus Europa 16V Gordini
« Reply #196 on: Thursday,June 30, 2022, 01:25:43 PM »
Here are some photos of the three Lotus Europas in the Spa Summer Classic paddock. It was the first time for me to meet other Europa racers. The yellow TC is freakin fast and does 2:59 min lap times. The owner Malcom Johnson told me that his car has 180 HP and around 620 kg of weight. He uses four piston front brakes and two piston rear brake calipers, both from AP racing. The windshield was made from lexan. Thus, series mods going on there.

The light green Europa TC seem to have been a little bit unlucky this weekend and was only able to do a 3:19 min. But I'm sure, this car is capable of lapping significantly faster.

My Renault powered Europa is forced to whey a minimum of 740 kg by the regulations and the engine puts out 162 HP. My weekend was troubled by several problems with brake, cooling and wrong choice of tyres, just to name a few. Thus, my best time of 3:15 min was also far away from good. The sum of my all-time best sector times at Spa add up to 3:10 min, but I'm optimistic that I'm able to get in the 3:05 min range, if I'd be able to run trouble-free and with enough practice. I have never run trouble-free at Spa in the past, thus my sector records have still a lot of room for improvement.

Offline jbcollier

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Re: Lotus Europa 16V Gordini
« Reply #197 on: Thursday,June 30, 2022, 01:47:39 PM »
The regs in your series are bat-crap crazy.  A Europa TC can weigh less than a Renault powered one?  Later cars get stickier tires?  Find a different series!!!

Offline Mecky

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Re: Lotus Europa 16V Gordini
« Reply #198 on: Friday,July 01, 2022, 03:20:02 AM »
Hi jb,
sorry for confusing you. The other two Europas race in different racing series', but at the same event. The yellow one races in the British Classic Sports Car Club, the green one in the Dutch NK GT & Touring Car Cup and I am racing in the BELCAR Historic Cup. I'm not familiar with the regulations of the other competitions, but these three cars have to comply to three different sets of rules.

That's why the yellow Europa is allowed to be lighter than my car. I guess, a British series embraces light British sports cars a bit more than a continental racing series does. In continental Europe they want to even out the field for the mostly steel-bodied cars, so that the British do not come over the channel and humiliate the competition. If he'd join my series, he'd have to increase his weight up to 810 kg, because he has 1700 cc and that's the minimum weight of the 2 litre class. The light green Europa is allowed in my series, too. But he'd have to increase his weight up to 740 kg, just like me.

Offline Mecky

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Re: Lotus Europa 16V Gordini
« Reply #199 on: Thursday,August 03, 2023, 01:36:36 AM »
In May, I competed again in the BELCAR Historic Cup in Zolder, Belgium. On Thursday, I did a test session in the afternoon, where little issues were sorted out (e.g. adjusting the clutch). Friday was the day for technical scrutineering and a thorough check-up of the car.  :welder:

On Saturday, I qualified for 26th place on the grid out of a total of 40 starters and 2nd place in class. Unfortunately, my lap time of 1:59.947 min was 1.8 seconds behind my personal best time of the previous year. This is especially annoying because the new Quaife limited slip differential was supposed to improve the lap time. But analysis of the sector times clearly shows that the Quaife works fine. The problem was the engine. It did not produce the same power as last year. The top speed was about 4 km/h worse and the revs reached before the braking points also indicate a engine power deficit. I lost the lion's share of the 1.8 seconds (1.6 seconds) in the first two sectors of Circuit Zolder. These are the sectors without particularly tight corners. The tightest corners are both in the third sector. There, the inside rear wheel lost traction when accelerating out with the differential open. With the Quaife, this problem is solved. My iteration showed that the limited slip diff alone brings a benefit about 5 - 6 tenths of a second per lap.

In the first race on Sunday, there was a crash in turn 1 right after the start, which some drivers had to avoid. The leader in my class had to brake and I was able to take the lead. Unfortunately, I couldn't hold on to this lead for long and ended up driving a lonely race. Opponents, I drove circles around in 2022, left me behind this time. The power deficit of the engine seemed to have gotten worse after qualifying. I finished the race 25th overall and 2nd in class.

In the second race, I noticed after a few laps that something was wrong with the water temperature and stopped the car in the pits. The findings are now clear: loss of coolant through a damaged cylinder head gasket. The cylinder head got damaged, as well.  :deadhorse:

So I am now having a new engine built-up by an Alpine specialist in Germany. Unfortunately, the 2023 season is now over for me. The engine won't be ready in time for the last race of this year. To take advantage of the long break, I'm also having a shorter ring and bevel gear specially made for my 395 five speed gearbox. Then I finally have shorter gearing. Right now, my top speed (5th @ 7500 RPM) is 232 km/h. On the German Autobahn, where you can go straight for 5 km, that may be OK. But on race tracks, which have straights of not more than 900 m, that's just rediculous. At least when you only have 160 horsepwer. With my new ring and bevel gear, the top speed will come down to 212 km/h. This change to the gearbox is not the best possible solution, but in relation to a completely new straight-cut gearbox, I get about 90% of the benefit for about 50% of the costs.

Hopefully, by 2024, I will finally be able to drive a full season and regularly compete for class wins.  :pirate:
 :ttiwwp:

Offline jbcollier

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Re: Lotus Europa 16V Gordini
« Reply #200 on: Thursday,August 03, 2023, 07:05:00 AM »
Racing is 110% effort for 90% discouragement and 10% elation.  I hope your new engine does them job.

I would love to hear about your new pinion shaft and ring gear!  Who? What? Where? How much? !!!

Offline BDA

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Re: Lotus Europa 16V Gordini
« Reply #201 on: Thursday,August 03, 2023, 07:07:49 AM »
What a bummer to lose your engine like that. Hopefully next year you’ll be set up for a long successful season!

Thanks for the great pictures BTW! The car looks great!

Offline Mecky

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Re: Lotus Europa 16V Gordini
« Reply #202 on: Friday,August 04, 2023, 03:14:11 AM »
Racing is 110% effort for 90% discouragement and 10% elation.  I hope your new engine does them job.

I would love to hear about your new pinion shaft and ring gear!  Who? What? Where? How much? !!!
You are right JB. I'm really into this project since the beginning of 2020 and it has cost me around 30k € since then. The planned upgrades for 2024 will add another 10k on top of that. The results so far: Many disappointments, less than 10 hours of net driving time on track, one great weekend and one class win. It roughly translates into the 90:10 ratio, which you mentioned.

Regarding the gearbox upgrade, I found out about a company in Bremen, Germany, called Tandler Racing Drives. It's a gear wheel factory, which expanded their business to manufacturing of special gears and gearboxes for historic (racing) cars in small numbers or even one-offs. That's a smart move, as historic car guys often have a lot of money and are willing to throw it at people, who can deliver what they request.
Right now, I'm waiting for a quotation. The ballpark figure is around 4500 € without tax. I had to send them parts of my gearbox, so that they can take measurements from the samples. Then, they will convert that information into new parts. The ratio, I'm aiming for, is 8:33, instead of my old 9:34. That will reduce my top speed by 20 km/h and should bring a big leap forward in acceleration terms.

The other upgrade, I'm planning in the moment is about aerodynamics. The engine and gearbox stuff will consume most of my spare money with ease. Thus, my only available resource left is time. And in the aero area should be some room for improvement, which only requires a few things from the local hardware store, a fair amount of research and some manual labour.
My racing series allows a front spoiler for every car and rear aerodynamic divices only, if homologated. Thus, at the rear is nothing for me to gain, as the Europa has no homologated aero equipment. But at the front, I want to add a splitter, in order to reduce lift and maybe get some more load in the front wheels, especially under braking. The splitter should look like a mix of the two Europas, which are shown below. The aero will not be as sophisticated as the grey & yellow Europa. I'm not allowed to use side skirts and a snorkel like this car has. But hopefully, my solution will look a bit nicer than the splitter on the black Europa. I used to have the TC front spoiler on my car, but after it was removed by accident, I didn't notice any difference, thus now I want to go a step further with the front end aero.

Offline Kendo

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Re: Lotus Europa 16V Gordini
« Reply #203 on: Friday,August 04, 2023, 10:52:04 AM »
Your mention of Tandler Racing Drives makes me think of the 365 transmission fifth gear, and whether a group buy would bring the price down much. I'd buy a spare gear for one tenth the price you mentioned, if Tandler could make, say 10 of them for 1/10th the price. Dreaming, I know.

One of the Richards made a very nice looking front splitter. I don't have a link to his post, but have the pictures if that post can't be found.

Offline Richard48Y

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Re: Lotus Europa 16V Gordini
« Reply #204 on: Friday,August 04, 2023, 02:22:15 PM »
I have been contemplating completion of the air dam a PO began on my car.
Then taking a mold from it.

Offline jbcollier

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Re: Lotus Europa 16V Gordini
« Reply #205 on: Friday,August 04, 2023, 10:17:10 PM »
Please keep us updated on how the ring/pinion works out.  I just spent a $1K getting a 4spd 352 pinion shaft converted to 5spd.  A new pinion would be stronger, I'm sure.

Regarding 365 5th gear spares, Hewland has all the specs and is willing to make another batch.  Unfortunately, a batch is something like 200 units and no one has deep enough pockets for that, so far.  It is possible, or at least it has been done, to fit a 395 5th, rear cover and shift linkage to a 365.  Those parts are available used but not so common these days either.

Offline Mecky

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Re: Lotus Europa 16V Gordini
« Reply #206 on: Thursday,August 17, 2023, 10:47:40 AM »
Hi jb,

i received the price for bevel- and ring gear. 5195 € for one set and 3320 € for two sets.

That leads to my question: Is there anybody out there, who wishes a shorter gearing for their Renault 395 gearbox? We could do a collective purchase order.

Offline jbcollier

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Re: Lotus Europa 16V Gordini
« Reply #207 on: Thursday,August 17, 2023, 11:45:09 AM »
Sounds about right for that kind of one-off machining.  Sadly, I can’t join you in this endeavour as I’m going the other way to a taller ratio.

Offline Mecky

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Re: Lotus Europa 16V Gordini
« Reply #208 on: Thursday,August 24, 2023, 12:21:35 AM »
Sounds about right for that kind of one-off machining.  Sadly, I can’t join you in this endeavour as I’m going the other way to a taller ratio.
Hi JB, which ratio are you aiming for? I could try and ask, if they would be able to make two different ratios from the same raw / half-finished materials. Maybe that could also reduce the price per piece by a significant margin.

Offline jbcollier

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Re: Lotus Europa 16V Gordini
« Reply #209 on: Thursday,August 24, 2023, 05:56:06 AM »
Thanks but I have already had a 352 shaft modified to take the 5 spd extension.