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Post a reply to the thread: SBC HEI voltage
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Bear in mind about the fuel pressure gauge Gary. Many give a lower reading as they warm up so it's possible to adjust the pressure up too high on the regulator and get a flooding situation. Adjust it cold and see what happens. At this stage you can run a really low pressure to get the car basically right and then creep up on the adjustment as it becomes driveable.
Originally Posted by 32chris
irrc it was a red top facet pump
Thanks Chris, TBH I never looked at it, I just installed it! Running two filters, one before the pump & one in the engine bay, I'll fit the pressure regulator, change the oil & plugs & report back.
Red top is a decent pump but can pump up to 8psi. I would think it highly likely that it's blowing an Edelbrock needle valve open. I would run the regulator with that set up and wind it down to 5psi on the gauge. One thing to bear in mind if you use the small liquid filled gauge....The reading drops as the engine warms up! Set it up cold and you should be fine. If you use an Edelbrock carb you can run a slightly higher cfm than the Holley so I think the 600 will be fine.
One other check. Are you using the original fuel tank? Plenty of filtration, preferably two stage? If it's pulling dirt up to the needle valve then you will get constant problems.It's surprising on a street car how little fuel volume is needed under normal circumstances. I run twin Edelbrocks on my coupe and have accidently left the pump off a few times. It's quite some way before the thing splutters!
irrc it was a red top facet pump
Agree with Steve, does rather seem that the fuel is leaking in all the time as your oil level increased = too high pressure.
I think your first job is to establish just what fuel pump you have!
Thanks folks. Vince, I was running a gauge & regulator on mine, but it looked awfull so I removed it & the car ran the same, but seems to have declined over the last few months. I'll put it back on & bypass the ballast wire to give 12volts & see what difference it makes.
I changed the oil just before Xmas & got out 1.5 times what went in!!!!
Fuel pressure wise Im using a holley blue top pump and regulator is set at 4.5-5 psi (i seem to remember it was you that told me to lower mine) ive had to put a permenant gauge on mine as every now and then the reg seem to allow full flow 8+ psi and push past the floats and overflow the carb (i mean overflow as in out the top of carbs and over both sides of the engine while driving or sitting at lights)
I think it's all been said really. If it's a GM HEI it needs 12v. You also need to know what fuel pump you have and what it's output pressure and volume is. Is it an injection pump?. A 600 carb will work on that engine without being that rich. I ran one for some time and it was crisp and responsive and co was fine. CFM size does not neccesarily relate to mixture strength and certainly does not lead to a mixture as rich as yours. If it's that rich you may want to change the oil once you get it sorted as well.
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