Weber DCNF 40 Carb
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- Joined: January 26th, 2011, 3:27 pm
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Weber DCNF 40 Carb
Hi,
Does anyone have specs. or pics. of an adapter to match a DCNF to a standard Fiat TC manifold? I've heard that this is an improvement over the 34DMSA carb I'm using now. The engine is a slightly modified 1756. The current intake manifold does not have a provision for heated water from the engine. I've also installed Alquati 24/1 cams, gasket matched the intake, and a header with free flowing exhaust.
Thanks,
Jon
Does anyone have specs. or pics. of an adapter to match a DCNF to a standard Fiat TC manifold? I've heard that this is an improvement over the 34DMSA carb I'm using now. The engine is a slightly modified 1756. The current intake manifold does not have a provision for heated water from the engine. I've also installed Alquati 24/1 cams, gasket matched the intake, and a header with free flowing exhaust.
Thanks,
Jon
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Re: Weber DCNF 40 Carb
no and for good reason, the DCNF is for transverse units. It's to to with the float chamber orientation.
FWIW (in stating that) I am frequently told, 'well I run IDFs transverse and they work oK,' or 'I use DCNF on a RWD setup and they work OK.'
And when I ask if they ever suffer fuel starvation they say, ' yes but it isn't too bad.'
So be it, what can I tell them??!!
G
FWIW (in stating that) I am frequently told, 'well I run IDFs transverse and they work oK,' or 'I use DCNF on a RWD setup and they work OK.'
And when I ask if they ever suffer fuel starvation they say, ' yes but it isn't too bad.'
So be it, what can I tell them??!!
G
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- Location: Iowa
Re: Weber DCNF 40 Carb
Thanks for checking in Guy, I've heard of an adapter that turns the carb 90 deg. That is why I came here to get good advice.
Jon
Jon
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Re: Weber DCNF 40 Carb
Jon,
I will email you Jim Scurria contact info, He ran this setup as well as I. I don't like the adapeter I have it is too thin and dosn't seal well.
Ted
I will email you Jim Scurria contact info, He ran this setup as well as I. I don't like the adapeter I have it is too thin and dosn't seal well.
Ted
74FP SCCA 124 spider
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Re: Weber DCNF 40 Carb
Hi,
>no and for good reason, the DCNF is for transverse units. It's to to with the float chamber orientation.
I think he wants to use it as a single carb on a 124, so it would be oriented the correct way, East-West :-)
The adapter can be a simple piece of aluminum, about 10-15mm thick, with 2 sets of holes drilled, one to bolt it on the
manifold, and one for the carb.
bye,
Csaba
Auto Ricambi, LLC
>no and for good reason, the DCNF is for transverse units. It's to to with the float chamber orientation.
I think he wants to use it as a single carb on a 124, so it would be oriented the correct way, East-West :-)
The adapter can be a simple piece of aluminum, about 10-15mm thick, with 2 sets of holes drilled, one to bolt it on the
manifold, and one for the carb.
bye,
Csaba
Auto Ricambi, LLC
GC book #288
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Re: Weber DCNF 40 Carb
Csaba,
Thanks for checking in. I have e-mailed Jim and mounted the carb. I'm currently trying to work out a stumble off idle. Any thoughts?
Jon
Thanks for checking in. I have e-mailed Jim and mounted the carb. I'm currently trying to work out a stumble off idle. Any thoughts?
Jon
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Re: Weber DCNF 40 Carb
Jon,
I has been a long time since I tuned a DCNF, but I would look at the accelerator pump sizing. That, and the idle jet.
bye,
Csaba
I has been a long time since I tuned a DCNF, but I would look at the accelerator pump sizing. That, and the idle jet.
bye,
Csaba
GC book #288
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- Posts: 7
- Joined: January 26th, 2011, 3:27 pm
- Location: Iowa
Re: Weber DCNF 40 Carb
Csaba,
I've gotten the idle jet sizing worked out by using Pat Braden’s method. I currently have 45 jets in the carb. I tried 40's in it and that made it way too lean.
I'm going to try a 45 accelerator pump jet next to see if I can prolong the pump shot. I looked into the carb as I accelerated it by hand, and I feel like the fuel was not transitioning from the idle circuit through the pump shot into the main circuit smoothly.
I also feel like the main circuit is not vaporizing the fuel enough, so my next step is to increase the size of the air correction jets. It now has 180 airs in it. I'll go up to 200 next etc.
Let me know what you think and if any of my logic is flawed.
Thanks,
Jon
I've gotten the idle jet sizing worked out by using Pat Braden’s method. I currently have 45 jets in the carb. I tried 40's in it and that made it way too lean.
I'm going to try a 45 accelerator pump jet next to see if I can prolong the pump shot. I looked into the carb as I accelerated it by hand, and I feel like the fuel was not transitioning from the idle circuit through the pump shot into the main circuit smoothly.
I also feel like the main circuit is not vaporizing the fuel enough, so my next step is to increase the size of the air correction jets. It now has 180 airs in it. I'll go up to 200 next etc.
Let me know what you think and if any of my logic is flawed.
Thanks,
Jon
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