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45 dcoe setup?
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2010/2/26 10:17
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I would like to get a few opinions on what people would install in a set of twin 45 dcoe 13 webers.
Currently they run
F16 emulsion tubes
145 main fuel
185 air correctors
50f9 idle jets

Here are the details of the engine
Early series l20b with 89mm bore and z24 piston with 15cc dish
Z24 crank with 96 mm stroke.
Rods are unknown but assumed z24
U67 head nitride 44mm inlet valves and 37 exhaust valve
230 pound double valve springs
74 works wade high lift cam. Which has been advanced slightly to try and bring it on earlier.
Ports have been matched to a datrally manifold
The compression chamber has been relieved to assist with flow.
The head was cc'd and the compression ratio was very close to exactly 10.5-1.
Currently it is producing peak power at 5800, advised not to hold rpm over 6200 due crank may snap. So I would say that's the redline.

It was dynoed with this setup and was described as a safe tune, I'm just interested in what others think as I have already had a few different opinions of what I should be looking at changing.

Posted on: 3/16 9:29
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73 coupe with L20B 2.4 Stroker
4door sedan with L20B on LPG
Project- 68 1600 with FJ20
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Re: 45 dcoe setup?
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You forgot to list the venturi size. The most important tuning piece

With those jets it probably has 36mm.and is running slightly rich which is safe. You might be able to go slightly smaller on the main jets to increase fuel economy with no loss of power.

Posted on: 3/16 9:52
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Re: 45 dcoe setup?
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Thanks, they were 38mm when dynoed.
Aux venturis 4.5

Posted on: 3/16 9:55
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73 coupe with L20B 2.4 Stroker
4door sedan with L20B on LPG
Project- 68 1600 with FJ20
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Re: 45 dcoe setup?
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If I'm reading my Weber book correctly, for a 2.4 liter at 5800 rpm it is recommended to use 40mm venturis.

Posted on: 3/16 10:03
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Re: 45 dcoe setup?
No life (a.k.a. DattoMaster)
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Im running 32in my single dcoe on l18 with similar head work. Definately needs bigger but ask randy. Id guess 40 may be a bit big even.
38 produced your hp and its safe tune. Id get it handling better in the rear for your time slip. Less wheel spin more traction.
Caltracs maybe???

Posted on: 3/16 10:45
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Re: 45 dcoe setup?
No life (a.k.a. DattoMaster)
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my rough calcs say about 100kw/135bhp at the wheels max from 38mm chokes. 145main jets match that expectation as well. As does punching your mph (95) and the weight of my old L20 1200 (850kg/1870lb) into a calculator.

That's a very healthy L series. It takes a VERY good cylinder head to make more than that, and the MOST you can reasonably expect while running 45mm carbs is 155bhp. The amount of $$ outlayed for that next 20bhp would be pretty scary I think. Unless you've got lots to spend, I say just enjoy it the way it is - it's got very good grunt and will be alot of fun!

Posted on: 3/17 3:36
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Re: 45 dcoe setup?
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Thanks for the comments, its exactly what i am looking for. I'm not looking to get that much more power out of it but am looking to learn about how dcoe webers operate and to see what we can produce out of what i have by refining the tune while i see first hand what effects changing parts have on it. i have picked up a small selection of jets etc and a friend has a quality AFR meter and we will see what happens.

Thanks.

Posted on: 3/18 3:55
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73 coupe with L20B 2.4 Stroker
4door sedan with L20B on LPG
Project- 68 1600 with FJ20
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