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Weber Tuning
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http://www.clubcobra.com/forums/weber-tuning/)
| talos |
12-02-2024 06:34 AM |
Electric Fuel Pump 4 Webers
I am in the final process of converting my Ford FE 427 dual quads over to 48 ida webers. From what I can see I have to can my Mallory 140 series fuel pump/regulator. 12 psi pump which is to hard or impossible to get down to 3 psi even with a regulator on a dead head system. I would like to know a good fuel pump/regulator to use on a dead head application for webers.
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| KarlzEE Bebout |
12-02-2024 09:04 AM |
There are specific regulators that will restrict your pressure down to the required 3-5# range. I think mine is a Holley.
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| talos |
12-02-2024 09:09 AM |
If you ever get the Holley Number? Most of the regulators I looked at do not like 12 psi input and bring it down to that range. The Holley 12-804 maximum inlet pressure is 7 psi. That's why I thought I would have to get a different pump. I will look too. Thank You
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| PaulProe |
12-02-2024 07:27 PM |
From experience, don't cheap out on the regulator. It is a task to get the pressure down to the 3-4 psi range and cheap ones claim they will but won't
I used an Aeromotive Low Pressure High Flow regulator. They make a couple
Paul
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Unless you are racing, you really do not want to be much over 3.5 psi. In race you can get away with a little over 4 psi because you are running at WOT most of the time. As Paul said, get a good pressure regulator.
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| talos |
12-05-2024 03:33 AM |
Just as a follow up: My Mallory 140 series fuel pump has an external bypass adjustment screw with locking nut. I was able to bring the fuel pressure down to 6 psi from 12 psi. I then used a Mallory 4207 regulator to further bring the psi down to 3 psi and less if needed. Dual 3/8" outlets with a pressure gauge outlet.
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| priobe |
12-07-2024 07:35 PM |
2nd that on the Aeromotive regulator, I have use 13202 regulator with a Arromotive fuel pump.
Also, I would not run a deadhead style fuel system.
I have IDAs and run a return style system with no issues.
Also, I would balance your carbs on the bench and set your floats visually.
This made a huge difference and provided consistency
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One of the most critical things you have to do is make sure that the linkage it tight (no slop) and pulling equally. You can only do that once the carbs are installed on the engine and it is all mounted in the car. Bench testing will get it close, but you have to have it in the car and pulling on the throttle pedal to fine tune the linkage. Any inconsistency in the throttle assembly will cause a lot of grief and you may be chasing the wrong problem (i.e., changing chokes, jets, etc.).
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| talos |
12-07-2024 08:24 PM |
It was a little harder to do, but I have set the floats on my 10' angle intake, on the car, with a pierce manifold PM1516 float gauge and balanced them with the syncrometer in two ranges. So far no issues. But if I do in the future, I have the info you have provided. Thank You
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| priobe |
12-08-2024 05:54 AM |
There is a lot of wealth and knowledge here about these carbs.
I prefer the wet gauge as I feel it is the most accurate in comparison to the tool you mentioned. Just my opinion.
Keep in mind, these carbs are race carb for the track, if you are trying to tune for drivability then this will go beyond the steps of just following instructions. I have found that you will get very intimate with these carbs in order to tune them for spirt drivability and still have good drivability.
The journey is not short.
Wet gauge
https://pmbperformance.com/products/...a-height-gauge |
Perhaps this is a dumb question, but does the wet gauge work with IDFs as well as the IDAs? Seems like it would...
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| Eljaro |
12-09-2024 06:07 AM |
I have been using a Carter Rotary Vane in line Fuel pump with my Weber setup. I also have used an Aeromotive ultra low pressure fuel pressure regulator #13222 which is very precise and stable, and worked withe a dead end setup. Remember that the Webers need about 0.3 Bar fuel pressure and the Holley does not do it right and output pressure starts to wander about after a while.
In case you might be interested I am selling my 8 Stack Weberv 48IDA intake for an FE engine , which includes the Carter electric fuel pump and the Aeromotive regulator. Look it up in the for sale section. Its yours for 3300€.
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| priobe |
12-09-2024 06:46 PM |
Quote:
Originally Posted by PDUB
(Post 1526393)
Perhaps this is a dumb question, but does the wet gauge work with IDFs as well as the IDAs? Seems like it would...
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I’m sorry I do not know.
If it fits, I don’t see why not. |
| Riverside racer |
12-18-2024 04:50 PM |
I decided to look at what the high end weber fitted Italian cars used. And after chatting to mechanics the fuel regulator was Malpassi and a vane not pulsating pump. I use a Carter vane style pump and malpassi regulator for the SBF.
4x45 DCoe's on a crossram inlet manifold and never a problem
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| talos |
12-18-2024 11:10 PM |
I looked at the Malpassi, which has 1/8" npt single fittings. I opted out for the Aeromotive due to the fact that it has (1) ORB-06 inlet port and (2) ORB-06 outlet ports with a 1/8" NPT gauge port. To be honest I tried the Mallory 4207. It seemed to work fine, but I finally put the Aeromotive on due to the quality. Thank You for your input.
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| D1Z427 |
12-20-2024 10:52 AM |
Quote:
Originally Posted by Riverside racer
(Post 1526462)
I use a Carter vane style pump and malpassi regulator for the SBF.
4x45 DCoe's on a crossram inlet manifold and never a problem
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Is that the P4600HP pump? Many people have complained about all types of electric fuel pumps in dead head configuration, even the Carter. There is a small check ball inside that pump that bypasses the fuel to the inlet thereby recirculating when the engine is not drawing anything like at idle. Apparently, some cavitation possibly involving overheating the fuel can create an air pocket in that circuit and then the fuel pressure drops and it can be hard to get out of that loop even when under fuel demand. The pump appears to work out for some people and others have issues. Hard to decide what to do |
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