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EFI runner diameter
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firepower354
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PostPosted: Tue Apr 22, 2014 6:27 am    Post subject: EFI runner diameter Reply with quote

I have 2 sets of steel EFI ends, one set (roughly) 23.5mm ID and one set 27.5mm ID. I'm cutting the 2>1 parts off to fab a long-runner setup. Does any one know why there was such a difference in the sizes?
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Weezle
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PostPosted: Tue Apr 22, 2014 6:54 am    Post subject: Re: EFI runner diameter Reply with quote

firepower354 wrote:
I have 2 sets of steel EFI ends, one set (roughly) 23.5mm ID and one set 27.5mm ID. I'm cutting the 2>1 parts off to fab a long-runner setup. Does any one know why there was such a difference in the sizes?


I have intakes from a FI bug that are much smaller ID than that. What type of car are they from? I think mine are 18mm ID
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miniman82
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PostPosted: Tue Apr 22, 2014 1:08 pm    Post subject: Reply with quote

They probably realized the small tubes were a choke point and made them bigger, but even the later cast aluminum Mexi EFI stuff is too small for all but a mild 1915.
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theKbStockpiler
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PostPosted: Tue Apr 22, 2014 2:30 pm    Post subject: Reply with quote

I believe I have set of 1975 type I's

Part number 043133213A +GF+125117A

and they measure:

I.D of branch ends (27.5)mm

I.D of single inlet to branch ( 32.3) mm

O.D of branches ( 30.25)mm
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Weezle
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PostPosted: Sat May 03, 2014 5:43 am    Post subject: Re: EFI runner diameter Reply with quote

Weezle wrote:
firepower354 wrote:
I have 2 sets of steel EFI ends, one set (roughly) 23.5mm ID and one set 27.5mm ID. I'm cutting the 2>1 parts off to fab a long-runner setup. Does any one know why there was such a difference in the sizes?


I have intakes from a FI bug that are much smaller ID than that. What type of car are they from? I think mine are 18mm ID


I was wrong, the rubber tube that connect the manifold to the plenum has an inside diameter of 1.25" so way more than 18mm
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clonebug
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PostPosted: Sat May 03, 2014 8:09 am    Post subject: Reply with quote

The German intake from the plenum to the endpieces is 1 3/8ths inch outside diameter.
Mario was able to push a little over 200 hp through them with a turbo.

I just eliminated the German plenum on mine and built my own intake using 1 5/8ths inch tubing.

Image may have been reduced in size. Click image to view fullscreen.


You could use 1 7/8ths and just clear the alt stand but it introduces many headaches with an endpiece with a smaller inlet and using a reducing coupler.
Basically there is no place to slide the coupler out of the way to pull the intake so you have to pull an end piece to remove the intake.
I can't pull an endpiece without pulling the shroud...........see where I am going????......I cant pull the shroud without pulling the Buggy body....... Rolling Eyes
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66brm
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PostPosted: Sat May 03, 2014 9:24 pm    Post subject: Reply with quote

clonebug wrote:


I can't pull an endpiece without pulling the shroud...........see where I am going????......I cant pull the shroud without pulling the Buggy body....... Rolling Eyes


Thinking out of the box here, .....why don't you just drop the engine out the ass end? It is a buggy after all..?
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clonebug
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PostPosted: Sat May 03, 2014 9:38 pm    Post subject: Reply with quote

66brm wrote:
clonebug wrote:


I can't pull an endpiece without pulling the shroud...........see where I am going????......I cant pull the shroud without pulling the Buggy body....... Rolling Eyes


Thinking out of the box here, .....why don't you just drop the engine out the ass end? It is a buggy after all..?


As you can see my Buggy body hangs pretty low in the back.

Image may have been reduced in size. Click image to view fullscreen.


It doesn't help I am an old Fart and can't bend as well as I used to.

I told myself when I started my turbo project that i would NOT cut the body in the back to add anything nor make it easier and so far I have stuck with that.

I am running out of room though...... Confused

There is no way that engine would come out with the body on.

It only takes an hour or so to get it ready to pull and now with the FI wiring added it takes a little over two hours.
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vwracerdave wrote:

Take a good long look in the mirror and report back on what you see.


Paul.H wrote:
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Water/Alcohol Injection
Audi TT intercooler
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66brm
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PostPosted: Sat May 03, 2014 9:51 pm    Post subject: Reply with quote

clonebug wrote:


I told myself when I started my turbo project that i would NOT cut the body in the back to add anything nor make it easier and so far I have stuck with that.

I am running out of room though...... Confused

There is no way that engine would come out with the body on.

It only takes an hour or so to get it ready to pull and now with the FI wiring added it takes a little over two hours.


Fair enough, I still feel there isn't any reason why the engine wouldn't come out although I know what you are saying about limited space, I recently helped a friend widen a Manx copy by about 4" total, and extended the back about the same to fit larger rear tyres under the fenders and dual carbs under the fiberglass with space for linkages and filters etc
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firepower354
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PostPosted: Sun May 04, 2014 6:21 am    Post subject: Reply with quote

I'm going for a sort of cross between the "Cross Fire" and a Type 4, with 4 long runners merging in to a common plenum, on Type 1, under the hood and not too outlandish looking. The 1" or 1-1/8" tubes should sneak through just fine. 74 Super Beetle is the car.




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theKbStockpiler
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PostPosted: Sun May 04, 2014 8:23 am    Post subject: Reply with quote

Are you going to use two throttle bodies like a crossfire? Confused
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firepower354
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PostPosted: Sun May 04, 2014 9:06 am    Post subject: Reply with quote

theKbStockpiler wrote:
Are you going to use two throttle bodies like a crossfire? Confused



No, common plenum 4>1 and progressive 2v carb, is the plan. It's a SoCal/TX car, so I'm thinking there will be less issues with atomization than in my frozen tundra. A couple of heat sources, long/narrow runners, snug quench, it should run OK in the warm country.
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PostPosted: Sun May 04, 2014 9:18 am    Post subject: Reply with quote

I think the factory manifold can keep up with the factory end-manifolds so I assume you want to tune the length of the runners for a specific rpm range? I have seen used single 2 barrel carb setups (non progressive) for sale in the samba classifieds that had provisions for the preheater tubes? Surprised I get the crossfire comparison now. Very Happy
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firepower354
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PostPosted: Sun May 04, 2014 1:11 pm    Post subject: Reply with quote

Yep, 4 long runners, all the way to the plenum.
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