Resto project done right

[Bainford]

I have read somewhere that the deck lid vents were redesigned/relocated when the rear sail panels were cut down for the TC variant, so as to maintain their function with respect to the slightly altered aerodynamics.

As for effectiveness, maybe it's time for a yarn test. Curiosity is piqued, now. Once mine is making noise again, I'm going to give this a try. I'll report back, but it won't be until spring at the earliest, so don't hold your breath.

[Rosco5000]

Looking at the pictures of this car and others.  I have seen the water deflector installed when people have changed to aftermarket filters on the weber cars as rain will soak the air filters if a deflector isn't in place.

That is a wonderful looking car!  I hope mine comes out that nice one day.
R

[BDA]

I did a yarn test on my TC. The yarn went straight up from the boot lid vent at about 30 mph. I also have louvers next to the license plate that were intended to be exhaust for my oil cooler. The yarn there was ambiguous. There was no real strong direction there (I probably maxed out at 50 mph in my test). Sometimes the yarn would go in a bit and sometimes out a bit.

[GavinT]

As for effectiveness, maybe it's time for a yarn test. Curiosity is piqued, now. Once mine is making noise again, I'm going to give this a try. I'll report back, but it won't be until spring at the earliest, so don't hold your breath.

I'd be interested to see that yarn test when you get around to it.
I found that with the rear boot / trunk removed, the air seemed to go out through the rear grill of the S2.

There's also something odd going on at the rear. On the S2, many people complain about exhaust gases "dirtying up" the rear bumper. I can only guess the exhaust swirls about on exit.
Of course, on a TC, the exhaust exits lower down.

[BDA]

Here's the video of the yarn attached to the boot lid vent grille: https://www.youtube.com/watch?v=aqHFg4q7jxA

If you want, I'll upload the video of the yarn attached to the louvers on the back of my car but I suspect an S2 would be quite different.

[Lou Drozdowski]

I did a yarn test on my TC. The yarn went straight up from the boot lid vent at about 30 mph. I also have louvers next to the license plate that were intended to be exhaust for my oil cooler. The yarn there was ambiguous. There was no real strong direction there (I probably maxed out at 50 mph in my test). Sometimes the yarn would go in a bit and sometimes out a bit.

BDA...Excellent test, hope these diagrams better explain your dancing purple yarn!

[BDA]

As I said, I added louvers next to my license plate to exhaust air that was supposed to go through the engine compartment and into my oil cooler mounted underneath the trunk tray and out through a duct to the louvers. I was counting on a low pressure area to help draw the air.

It turns out that I was wrong and the airflow in the back of the car seems to be driven by the low pressure area behind the rear window and on top of the boot lid.

There was a airflow or air pressure graphic of a Europa (IIRC S2) but I haven't been able to find it quickly. If somebody finds it, it might be useful to post it here.

[Lou Drozdowski]

BDA...Is this what you were looking for?

http://lotus-europa.com/manuals/misc/aero/Europa%20Aerodynamics.htm

[BDA]

Yes!! 

[Dilkris]

For future reference, is it possible to redirect the comments under "Resto project done right" (maybe from Friday, October 30, 2020, 12:55:15 AM) to a new thread "Engine Vents and Air flow" - there is some really interesting  info here on this subject and I just thought it would make it easier to find in a future search.     

[dakazman]

  very nice done.

   This was sort of a walk down memory lane and current my current snags. Question, was the  Gearbox overhauled?  A/C additions naturally would need a larger source of power as JB posted .
 Location of AC ducting, not a fan.
 Shifter could have used an upgrade also.

  Montune does a fantastic job on all his builds and I for one a fan. I wish they had a shop here in Florida.

  Dakazman 
   

[Chuck Nukem]

I believe the rear deck lids are interchangeable between the various Europas.

Overall they are, but there is a slight difference on the crown of the rear lip of an S1/S2 vs TCS and it is noticeable.

[dakazman]

   Chuck what about 4 vent holes  vs 2 ?
Dave

[Chuck Nukem]

   Chuck what about 4 vent holes  vs 2 ?
Dave

Yes 4 vent being S1/S2 and 2 vent being TC. Credit to JR73 as he pointed it out to me, but the corners of the rear lip that meet the sills are more curved on the 4 vent lids where the TC has a straighter profile.

[BDA]

The grilles on the S1 and S2 are screwed on where the grilles on the TC are glued.