Does anyone know if this carb have a power valve? And if so, does it pop when you have a backfire? What's the max fuel pressure that it should be run at? Thanks
Holley 5200 questions....
- Thread starter daves66nova
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It's the same as a weber DGV so it doesn't ahve the typical holley power valve. Run the fuel pressure around 3-4 psi but it'll run on 2-6 psi. 6 might be a little too much.
Does the power valve pop when you get a backfire?
I am looking at the exploded view of one now and it doesn't look like it has a power valve. Fair number of vac actuated diaphragms on it though.
Originally Posted By: daves66nova
Does the power valve pop when you get a backfire?
It doesn't have a holly power valve, did you read my post? These don't blow out.
Here's a IPB
http://www.docstoc.com/docs/13763751/5200-Holley-Carbuetor-Kit-Rebuild-Instructions
Does the power valve pop when you get a backfire?
It doesn't have a holly power valve, did you read my post? These don't blow out.
Here's a IPB
http://www.docstoc.com/docs/13763751/5200-Holley-Carbuetor-Kit-Rebuild-Instructions
Originally Posted By: tom slick
Originally Posted By: daves66nova
Does the power valve pop when you get a backfire?
It doesn't have a holly power valve, did you read my post? These don't blow out.
Here's a IPB
http://www.docstoc.com/docs/13763751/5200-Holley-Carbuetor-Kit-Rebuild-Instructions
I did read your post,but it does have a different type of power valve.I think i figured it out.On the bottom of the fuel bowl is a spring and plunger.Someone that might of rebuilt the carb installed it in reverse.Instead of the spring under the plunger,they put the spring on top of the plunger.
Originally Posted By: daves66nova
Does the power valve pop when you get a backfire?
It doesn't have a holly power valve, did you read my post? These don't blow out.
Here's a IPB
http://www.docstoc.com/docs/13763751/5200-Holley-Carbuetor-Kit-Rebuild-Instructions
I did read your post,but it does have a different type of power valve.I think i figured it out.On the bottom of the fuel bowl is a spring and plunger.Someone that might of rebuilt the carb installed it in reverse.Instead of the spring under the plunger,they put the spring on top of the plunger.
I can't recall any carburetors without power valves or other auxiliary enrichment devices.
Sorry, it was a bit of mis-communication. I am saying it doesn't have a "holley" power valve so they don't have the typical problems a holley has with power valves. In my experience a Weber DGV doesn't blow the power valve out if you get a backfire.
Looking at the diagram posted by Tom Slick, the "power valve" is Reference No. 39. This is a bit different enrichment valve than that used on a typical Holley 4bbl.
Man,this is weird.I have to stab the throttle around 3 times to get it started,but once the engine is on for a while,the headers will start to glow some,all 4 at the same time,same amount of glow.What the heck is going on?Is it set lean,but after it's running,it's rich,maybe due to it needing a fuel regulator?
Whats the timing?
I installed this carb a few months ago and it would turn on and idle very well,though i never drove because of no tags.Once i took it out to drive,It ran great for a block or 2,then it seemed like it started to flood.I took off a 3/8" vacuum plug and it seemed to start rather rough.I was able to drive it home revving it.A few days later is when i found out about the spring and plunger installed wrong.Now, i have to pump it a few times to even start it.My timing is set at factory spec,i forgot what it is at the moment.The vacuum was very good when it idled good,around 44".
anyone?
Well, i got to thinking and i'm wondering if i close off the 2nd port off the fuel pump,the return line,would that help a little so it won't be so lean now
Weird, after messing with it for a while ,the engine seems to be running like new now.Even drove it for a good while and no more problems.
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