Turbo Plenum Spacer Group Buy - Page 2 - LotusTalk - The Lotus Cars Community
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post #21 of 211 (permalink) Old 04-16-2016, 08:32 PM
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Quote:
Originally Posted by pete inno View Post
Pardon my ignorance, but I read the prior posts and other thread and did not see what benefit this spacer provides. Can someone enlighten this dumb old boatman.

Thanks.
See posting #325 here https://www.lotustalk.com/forums/f164...ml#post4721449
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post #22 of 211 (permalink) Old 04-16-2016, 10:03 PM
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Thanks Mr D. The thread on the lotus forum was quite informative.
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post #23 of 211 (permalink) Old 04-17-2016, 08:32 AM
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Here is another graph illustrating idea of "bigger is better".

By adding this "spacer", the weight of the plenum will increase.

If you don't have it already, do not forget to add a plenum support/stay. Otherwise, your manifold may develop cracks.

If you decide to go bigger, you can get two 1" spacers and seam weld them together. May require dipstick tube bending and a new stay.
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post #24 of 211 (permalink) Old 04-17-2016, 09:47 AM
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Count me in for the Group Buy.

Also, I imagine that, given MrD's warning that without a plenum stay/support, part of the "Group Buy" could (should?) included an added aluminum [?] plenum support/stay, as illustrated in MrD's pic.

Either including attachment hardware in Stainless (naturally) for the plenum support/stay (or just having MrD chime in with the specs ), perhaps along with a drawing of where to attach it would really "round out" the package.

Cheers,

Scott
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post #25 of 211 (permalink) Old 04-17-2016, 02:45 PM Thread Starter
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Those that are committing, so far to the buy:

Total of 10 so far!!

Tom Mieczkowski = mieczkow
1989 Turbo Esprit

Jim = Lotus4s
1995 S4s

fsrowsell
Deer Lake

Sanj x2

Don = CarSalesman
Esprit S4s

Scott = greentengu
1986 Turbo Esprit HCi

Kenny = MidLifeZ
Dallas Tx

Andrew = quadcam
Flo-rida

Redfox
UK, I think. Spells it colour :-)

Last edited by Jcslocum; 04-22-2016 at 07:22 AM.
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post #26 of 211 (permalink) Old 04-17-2016, 03:48 PM
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post #27 of 211 (permalink) Old 04-19-2016, 09:45 AM Thread Starter
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Quote:
Originally Posted by greentengu View Post
Count me in for the Group Buy.

Also, I imagine that, given MrD's warning that without a plenum stay/support, part of the "Group Buy" could (should?) included an added aluminum [?] plenum support/stay, as illustrated in MrD's pic.

Either including attachment hardware in Stainless (naturally) for the plenum support/stay (or just having MrD chime in with the specs ), perhaps along with a drawing of where to attach it would really "round out" the package.

Cheers,

Scott
I have no ability to make the stay without a drawing and then there is no guarantee that I can get it made. The spacer is easy with the water jet process but to make it with the bend.I can try to draw it in CAD and get it sent if someone can get me the dimensions that allows me to get a rough quote for the same qty as spacers.

I will spec out the exact bolt hardware too.
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post #28 of 211 (permalink) Old 04-19-2016, 12:15 PM
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Thanks for the answers, but it made me think of a few more, I'd really like to know about.
As I read it on the other thread, for example #325, the smaller (standard) plenum volume benefits low pull, with having a peak in VE in lower rpm's. And the bigger volume in the plenum chamber with the added 1" spacer, makes the increase in VE move the peak in pull up to the upper rpm band.
Is that correct?

How does that change help street driving?
Or, is this only for added top end power, at the possible cost of some low end pull?

The next I am wondering about is the injection and the ecu on the SE/S4/S4s cars.
Does that have the ability to adjust itself with the standard jets and programming, to the higher volume Vp with the added spacer? I must be sure, that I won't starve the engine, for example!

Note, that the engine in the UK is very highly uned, with a totally different engine setup and completely userprogrammable injection system; not anything like the standard ecm and standard system/jets etc. So what is the benefit on a standard engine? (not the highly tuned one at over 460hp)?

Finally, if the spacer is beadblasted, will it be on all surfaces, or only on some, like the outer circumfery? Can gaskets in paper as standard used, make it tight enough?

Very interesting, and I hope to get the answers, so if positive, I will add myself on the list too.

Kind regards,
Redfox.
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post #29 of 211 (permalink) Old 04-19-2016, 12:37 PM
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You can add me to the list.

I'm content with beadblasted or standard smooth aluminum finish, whichever route you go.

Andrew
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post #30 of 211 (permalink) Old 04-21-2016, 07:49 AM Thread Starter
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I can answer some of your questions.

The plenum does not make any difference to the air/fuel ratio by its larger size. No adjustments needed to the injection or carbs. It just adds volume to help each cylinder breathe more evenly which will add to smoothness and power.

The standard gaskets will be fine. The spacer at 1" thick will be very stiff and not add any flexibility or weakness to the gasket function. Clamping force will be that same and just by using longer bolts, the clamping force will be more stable. Believe it or not.

If the decision is to get them blasted, it would be done all over.

We have not discussed shipping yet, as they would be shipped to me and then I would use 2nd hand Amazon boxes to re-ship. I have a blast cabinet in the shop so instead of paying to have them blasted, I may be able to do it before shipping.

If you have the room for a 2" spacer or even more, these can be stacked up with gaskets between to seal them. Just longer bolts needed. I got a price for another poster on a 1-1/2" spacer and it was $435 for 1 piece. Not econimical at all.
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post #31 of 211 (permalink) Old 04-21-2016, 11:04 AM
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Count me in for 1 spacer.
I'll paint it myself in the correct colour.
Redfox.

Last edited by redfox; 04-21-2016 at 11:52 AM.
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post #32 of 211 (permalink) Old 04-22-2016, 08:40 AM Thread Starter
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That makes 10 total now.

This will be about $125 each plus shipping.

15= $118 each.
20= $115 each
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post #33 of 211 (permalink) Old 04-23-2016, 08:10 AM
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Hi,

Count me in for one also.

Just send me the details.

Rich Flowers
'79 JPS #040
'95 S4s ...SHF63000
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post #34 of 211 (permalink) Old 04-24-2016, 03:20 AM
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Add me in

87 Hci
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post #35 of 211 (permalink) Old 04-24-2016, 05:02 AM
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I am Redfox, and I am in Denmark. 1990 SE.

Cheers.
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post #36 of 211 (permalink) Old 04-24-2016, 05:14 PM
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Add another for me, i.e. TWO
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post #37 of 211 (permalink) Old 04-24-2016, 06:21 PM Thread Starter
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I will do a full update in the morning. How long do we wait to place an order?

UPDATE 04/26/2016

Those that are committing, so far to the buy:


Total of 15 so far!!

Tom Mieczkowski = mieczkow
1989 Turbo Esprit

Jim = Lotus4s
1995 S4s

fsrowsell
Deer Lake

Sanj x2

Don = CarSalesman
Esprit S4s

Scott = greentengu
1986 Turbo Esprit HCi

Kenny = MidLifeZ x2
Dallas Tx

Andrew = quadcam
Flo-rida

Redfox
DENMARK Could be a Brit, says cheers and Spells it colour :-)

Rich = Flowersjr
PA

Tremluf
Virginny

Eric = EW 89SE
in 47408

Ianarm77
Colorado

Last edited by Jcslocum; 04-26-2016 at 05:19 AM.
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post #38 of 211 (permalink) Old 04-25-2016, 05:56 PM
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Ooh, just saw this.
If its not to late Ill take one.
Eric in 47408
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post #39 of 211 (permalink) Old 04-25-2016, 08:08 PM
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Add me on the list for 1 bead blasted. Thanks!
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post #40 of 211 (permalink) Old 04-26-2016, 05:25 AM Thread Starter
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I added both of you to the list.

Now that we have 15, I will figure out the ordering process. The cost differential between 15 @ $118 and [email protected] $115 isn't worth waiting to secure more parts, unless the jump in before the order is placed.

I'm not the manufacturer but a guy who wants this and has access to these vendors and the willingness to run with it. I will get the totals calculated and ask each to pay in advance, including shipment. Once all have paid, I will place the order, 16-20 days for delivery, and get them sent.

Jon
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