V6 Supercharger Reference Guide

[scc.131.fe]

Hey All,

After spending some time searching existing posts for the following info, I'm hoping the moderators would consider pinning a 'sticky' topic within the "Supercharged 3.5L" forum category that gathers detailed specs and references for the V6 supercharger.

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"It's an Eaton R1740 compressor section in an Edelbrock housing made specifically for Lotus. The R1740 is a roots style with 4 lobes, 160deg twist." (Thanks @Porter)
Eaton TVS R1740
Main Eaton TVS Page
- Although some folks have also referenced "1750" when quoting from Emira promotional material...?

Here is a video showing assembly of what appears to be a similar (probably non-Lotus spec) Eaton/Intercooled unit from Edelbrock.
- Nice to see how the intercoolers fit in (similar to Audi 3.0L setup).
- Also nice to see where the bypass valve is, and maybe (just maybe), people will stop calling the bypass valve actuator the "throttle linkage"
Assembling an Edelbrock Supercharger

Edelbrock housing part number or kit number (for parts reference)?

Is this Edelbrock kit identical to an Evora implementation?
- If so, which Evora(s)?

Any Evora-based DIY links for upper cover or entire SC removal/reinstallation?

B&C supercharge parts catalogue
(Thanks @Rudi)

Thread for Painting the supercharger cover

Part numbers for cover and gasket: (thanks @Time2Fly )
Cover 8891348489
Gasket A132E0169F

Upper cover bolt type?
- Torque specs for the cover bolts should be 10nM (thanks @VL3X)

Gasket/seal part number for housing to manifold?

Housing-to-manifold :
"Supercharger to intake manifold is 10Nm
It all starts on page 42-15 of the service manual." (Thanks @Time2Fly )
- bolt type or p/n?

Supercharger Oil specification?

Eaton/Edelbrock/Lotus recommended oil change interval?

Oil plug part number?
- torque spec?

Is this unit vacuum or electrically controled for the bypass valve?
- I'm guessing vacuum, since the actuator appears to have a chamber (bean pot) similar to the Edelbrock assembly video above

Is there a position sensor on the bypass valve? If so, is there a code reader / diagnostic tool that allows viewing or logging of the bypass valve position?

Stock pulley sizes?

Stock SC belt part number?

More supercharger stuff, just for fun:
Engineering Explained - Supercharger Type Comparison
Eaton TVS animation with a very different bypass and intercooler setup
FCP Euro SC oil change on an Eaton
Motor1 Article with some history: Rise and Fall of the Supercharger
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I'll continue searching and updating as I find details, but please post any replies with specs and references if you have them on-hand, and I will incorporate the data in the main post.

 

[VL3X]

Great idea @scc.131.fe! Hopefully others can chime in with more information.

 

[VL3X]

Torque specs for the cover bolts should be 10nM (same as the oil pan bolts).

Here's a shot with the supercharger and charge cooler with the cover removed:

 

[scc.131.fe]

Great idea @scc.131.fe! Hopefully others can chime in with more information.

Thanks. Added the FCP Euro oil change video link (similar Eaton).

 

[Pugwash]

Here it is in situ with the cover removed.

 

[Rudi]

Ich war auf der Suche nach einem Ersatzteil für die Abdeckung des Kompressors und habe dieses hier ... Nur ohne V6-Emblem gefunden

Ich hoffe, Emira hat die gleiche Größe wie das Exige-Cover ...

Ersatzteilnummer für Dichtung und Abdeckung im Link


EXIGE-ABDECKUNG

Parts Shop - Bell and Colvill

Parts Shop - Bell and Colvill are selling and servicing cars from its showrooms.

parts.bellandcolvill.co.uk

 

[scc.131.fe]

@VL3X , No edit button on the initial posting any more, but wanted to add the following:

Thread for Painting the supercharger cover

Part numbers for cover and gasket: (thanks @Time2Fly )
Cover 8891348489
Gasket A132E0169F

 

[VL3X]

@VL3X , No edit button on the initial posting any more, but wanted to add the following:

Thread for Painting the supercharger cover

Part numbers for cover and gasket: (thanks @Time2Fly )
Cover 8891348489
Gasket A132E0169F

Hm, you should still be able to edit your post... Not sure why the button isn't showing for you. I went ahead and added this info to the first post.

 

[Rudolph]

* * * * *
DIY painting of supercharger cover.........
Back in 2021, I did the same thing myself with my new Evora GT 410 Sport IPS...it was relatively easy but probably a bit of work........as I said at temperatures of 60-70 degrees C. it holds up shrink varnish and clear varnish top layer flawless.......I've already driven several thousand miles on it......as nice as it was a few years ago. (See report below)
By the way, the old / black cover does not have a clear varnish coating, which means that the exposed aluminum "LOTUS" oxidizes over time......the new red shrink varnish lid is protected forever.
Tip: You can easily reuse the compressor lid gasket as it seals completely again.

Previous Black wrinkle paint cover

Red wrinkle paint sprayed cover

1) Took off the cover ......the steel / plastic gasket can be reused conform the Lotus importer.
2) Sanded the (black) cover slightly between the LOTUS trade mark and the rest of the cover with a kind of "scotch-brite" sanding pad
3) Cleaning with brake cleaner fluid
4) Several layers with red wrinkle paint VHT SP 204......also over the Lotus trade mark
5) Baked in kitchen oven 1 hr at 110 degr. C.
6) Carefully scraped off the still soft paint off the Lotus trade mark with a kind of wide Stanley knife blade; works asthonishingly easy and clean, without scrapes.
7) Sanded / polished the blank aluminium with min. 400 grit paper on flat block sanding hand tool
8) Several layers of 2 component (2K) matt clear coat.......the Lotus alu trade mark now is covered against corrosion and the entire cover better against moisture; wrinkle effect remains.
PAINTS:
* ) VHT Wrinkle Plus™ Coatings -- High Heat Coatings
* ) Eastwood 2K Aerospray Clear Coat Matte & High-Gloss (MATTE FINISH !) (for USA; for Europe VHT)

VHT Farben & Lacke

VHT Lacke und Farben

www.vht-shop.de

 

[73JPS]

- Also nice to see where the bypass valve is, and maybe (just maybe), people will stop calling the bypass valve actuator the "throttle linkage"

Hope springs eternal, however recent “data“ suggests nobody is getting the message

 

[MPD]

love it and definitely plan to paint as well. I just need to find out the color code for magma in order to paint it closer to color of the car

 

[Time2Fly]

@scc.131.fe
supercharger to intake manifold is 10Nm

It all starts on page 42-15 of the service manual.

 

[scc.131.fe]

@scc.131.fe
supercharger to intake manifold is 10Nm

It all starts on page 42-15 of the service manual.

Thank you sir, added to the original post. Also added a Motor1 article on the history of the supercharger (far from exhaustive, but some interesting historical bits):
Rise and Fall of the Supercharger

 

[Racer X]

I had a Corky Bell designed Lysholm supercharger kits that I installed on my NA Miata in the 90’s. That car was quick!

 

[VL3X]

Upper cover bolt type?

Anyone get this yet? Looking for the supercharger bolt spec.

 

[silent cilantro]

service manual says M6x20 and M6x40. The 2 center ones are 5mm allen and the ones around the cover are normal 8mm hex

 

[VL3X]

service manual says M6x20 and M6x40. The 2 center ones are 5mm allen and the ones around the cover are normal 8mm hex

View attachment 46925

Awesome, thanks!

 

[Time2Fly]

Does the gasket need to be oiled when you replace it?

 

[saknibs]

I just painted my cover and I did not re-oil the gasket when I put the cover back on. I did not clean the gasket either, so whatever oil was on it remained. I did clean the underside of the supercharger cover, covered it with paper and taped it around the edges.

Some thoughts on the crinkle paint. I was going to use regular VHT red, but my friend with a Modena 360 commented that the crinkle paint on his valve covers looked really good and it does. I did not achieve a factory like result. I did get uneven wrinkling. I tried more coats and multiple sessions with a heat gun, but it did not change. Maybe the humidity was too high. The can says 60% max, my shop was at 64%. At a casual glance, under the glass cover, it looks good. I might strip it and start over someday ...

Speaking of stripping, if you want to strip off the original black you will need aircraft stripper. I tried regular paint stripper and the original paint was impervious to it. I decided to put primer over the black, then the red crinkle paint.

I wiped the LOTUS logo with a lightly oiled paper towel before painting. The paint was easy to remove after I let it cure for 3-4 hours. I wet sanded it after 48 hours. When you sand the logo, wet the entire cover first. Blackened water will run everywhere from sanding. When you are done sanding, you can just rinse away the residue. If you don't pre-wet, you will have to use detergent and a tootbrush to get the black residue out of the wrinkles/crinkles (like me).

Best of success if you try it. Despite the medium quality result I'm still thrilled every time i look at it.

 

[MPD]

Thanks for the tips, hopefully will be doing this soon