Bypass regulator for carbs, Looking for recommendations |
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Bypass regulator for carbs, Looking for recommendations |
bbrock |
Jan 10 2019, 08:08 PM
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#1
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914 Guru Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains |
What's a good bypass regulator for dual carbs? Thinking I might just stick with the stock fuel pump if it still works since I already have it and will be running a return line. Otherwise, I'll get a Carter. Seems there are a lot of crappy regulators out there so I'd like to make sure I get something reliable.
Thanks. |
sithot |
Jan 10 2019, 09:00 PM
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#2
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Member Group: Members Posts: 446 Joined: 25-October 06 From: Virginia Member No.: 7,090 Region Association: None |
What's a good bypass regulator for dual carbs? Thinking I might just stick with the stock fuel pump if it still works since I already have it and will be running a return line. Otherwise, I'll get a Carter. Seems there are a lot of crappy regulators out there so I'd like to make sure I get something reliable. Thanks. Aeromotive |
johnhora |
Jan 10 2019, 09:01 PM
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#3
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Senior Member Group: Members Posts: 866 Joined: 7-January 03 From: Derby City KY Member No.: 107 Region Association: None |
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MarkV |
Jan 10 2019, 09:46 PM
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#4
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Fear the Jack Stands Group: Members Posts: 1,493 Joined: 15-January 03 From: Sunny Tucson, AZ Member No.: 154 Region Association: None |
Running a high pressure pump and a regulator seems like added complication with extra lines that could leak or cause a fire.
Someone here recommended this one to me: https://www.cbperformance.com/product-p/3193.htm It is internally regulates and installs in the stock location. I have had it for years... its quiet, reliable and not very expensive. |
yeahmag |
Jan 10 2019, 11:56 PM
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#5
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Advanced Member Group: Members Posts: 2,421 Joined: 18-April 05 From: Pasadena, CA Member No.: 3,946 Region Association: Southern California |
I second the CB pump.
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sithot |
Jan 11 2019, 05:40 AM
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#6
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Member Group: Members Posts: 446 Joined: 25-October 06 From: Virginia Member No.: 7,090 Region Association: None |
I second the CB pump. I agree there are bad regulators but Aeromotive isn't one of those. A low pressure pump is ideal. I removed my PMO setup after acquiring an NOS Bosch pump as used on the early LWB carbureted 911’s and 914-6. Pressure is perfect and it uses an internal return to the tank. Stoddard sells these but they are not cheap. Carter, Holley, Pierburg and others are decent choices. You do get what you pay for in this market. When I went from PMO's to Webers there was a lot of back and forth with Paul Abbott at Performance Oriented who I consider to be the preeminent Weber expert. We discussed regulators, pumps, AFR meters and other minutia. In the end the Bosch pump went in exactly where the CIS pump came out and since the plumbing was already there (I had previously upgraded it) the swap was easy. |
Mark Henry |
Jan 11 2019, 07:36 AM
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#7
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
Running a high pressure pump and a regulator seems like added complication with extra lines that could leak or cause a fire. I guess every FI car in the world needs to be scrapped because they're all ticking time bombs. (IMG:style_emoticons/default/rolleyes.gif) |
jd74914 |
Jan 11 2019, 08:29 AM
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#8
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Its alive Group: Members Posts: 4,776 Joined: 16-February 04 From: CT Member No.: 1,659 Region Association: North East States |
I second the CB pump. I agree there are bad regulators but Aeromotive isn't one of those. (IMG:style_emoticons/default/agree.gif) (IMG:style_emoticons/default/agree.gif) This is a certainly a case of you get what you pay for-Aeromotive makes a quality product. |
bbrock |
Jan 11 2019, 10:33 AM
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#9
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914 Guru Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains |
Thanks for all the feedback so far. Anyone know anything about Malpassi regulators? They keep popping up in searces for Weber carb regulators. Looks like they are Eye-Tal-Yun to match my carbs and more found in Europe than over on this side of the big water. Still not cheap, but less than the comparable Aeromotive model. They have a bonus of coming with 8mm fittings. Curious if anyone has experience with them.
(IMG:http://www.914world.com/bbs2/uploads_offsite/www.officinamalpassi.it-20845-1547224435.1.jpg) http://www.officinamalpassi.it/en/carburet...044-detail.html |
Mark Henry |
Jan 11 2019, 11:56 AM
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#10
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
I didn't care for them, couldn't get down to 3.5lbs with a carter LP pump, but I didn't try the bypass version. |
MarkV |
Jan 11 2019, 01:24 PM
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#11
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Fear the Jack Stands Group: Members Posts: 1,493 Joined: 15-January 03 From: Sunny Tucson, AZ Member No.: 154 Region Association: None |
Running a high pressure pump and a regulator seems like added complication with extra lines that could leak or cause a fire. I guess every FI car in the world needs to be scrapped because they're all ticking time bombs. (IMG:style_emoticons/default/rolleyes.gif) Fuel injected cars require high pressure, carbed cars obviously do not. Just seems like a recipe for a problem to try to make a 20+ psi pump put out 3.5 psi. Doesn't take much pressure to overcome the needle and seat in a carburetor.... that and you can buy a carb pump for less than $100. (IMG:style_emoticons/default/confused24.gif) |
bbrock |
Jan 11 2019, 03:09 PM
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#12
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914 Guru Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains |
Running a high pressure pump and a regulator seems like added complication with extra lines that could leak or cause a fire. I guess every FI car in the world needs to be scrapped because they're all ticking time bombs. (IMG:style_emoticons/default/rolleyes.gif) Fuel injected cars require high pressure, carbed cars obviously do not. Just seems like a recipe for a problem to try to make a 20+ psi pump put out 3.5 psi. Doesn't take much pressure to overcome the needle and seat in a carburetor.... that and you can buy a carb pump for less than $100. (IMG:style_emoticons/default/confused24.gif) When used in a bypass system set to 3 psi with return line, there is never any high pressure in the line regardless of the pump used. An EFI pump simply moves more fluid where a little is bleed off to make 3 psi for the carbs and the rest is returned to the fuel tank. There are a few other threads discussing pros and cons of recirculating vs. deadhead systems for carbs. After reading the great info here and elsewhere, I've decided a recirculating system is the way I want to go. Once that decision was made, retaining my stock pump becomes a viable option, but regardless of the pump I choose, I'll need a bypass style regulator. (IMG:style_emoticons/default/beerchug.gif) |
larryM |
Jan 12 2019, 03:01 PM
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#13
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emoze Group: Members Posts: 891 Joined: 1-January 03 From: mid- California Member No.: 65 Region Association: Northern California |
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bbrock |
Jan 12 2019, 10:34 PM
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#14
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914 Guru Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains |
Unfortunately it looks like Holly's bypass style regulators are designed for a target pressure of 7 psi. The lowest pressure any of them can do is 4 psi. Otherwise, I think they'd be a great option. |
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