FE Power Forums
FE Power Forums => FE Technical Forum => Topic started by: tomsfe64 on December 15, 2017, 12:02:23 PM
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got my 427 hi riser 2 carb engine running with 2 holly 600 carbs. its running way too rich and these carbs dont have replaceable secondary jets. its only getting about 330 hp at 5k. i think 1200 cfm may be too much ? would quick fuel 450's be a better choice ?
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Wrong direction. It wants more - not less. A pair of 750s
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1500 cfm?
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I don't see why the 600's can
t work. Would need more info on where it is so rich.
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its running rich the whole rpm range. got a oxy sensor on chassis dyno. these carbs dont have removable secondary jets. the tuner says he cant lean it
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To big carbs runs lean, not rich and another carb
don't doubles the flow
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Then get tuning parts for the back end:
http://www.jegs.com/p/Quick-Fuel/Quick-Fuel-Billet-Secondary-Metering-Plates/750660/10002/-1
You can also modify stock metering plates for jets, lots of info on the web.
I run two 600 Eds on a 302 - actually had to bump fuel up 4% on both primary and secondary of both carbs to get best MPH on the track. No reason a pair of 1850s can't work well. Seems to me except maybe for idle depending on the air bleeds, should be close to lean out of the box with stock jetting. Make sure you are not feeding fuel from unknown sources like cross leaking metering block to main body gaskets or power valve gaskets. Also consider that you do not have "1200 CFM" on the engine. You've basically got 600 CFM until you wind that bugger up. Would you run a 600 vacuum secondary on a 4 cylinder motor - sure, no problem and should not necessarily be fat out of the box. Have run a 600 DP on a 302 for several years, ran great. You've got two 4 cylinder motors with a common block - or a big motor with a bitty 600 DP on top of it.
Holley 450s are mechanical secondary carbs without a rear accelerator pump - run away. Would just make for more problems IMHO.
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Can a 427 high riser motor only make 330 horse power, I mean you should be able to make 400 by accident
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got my 427 hi riser 2 carb engine running with 2 holly 600 carbs. its running way too rich and these carbs dont have replaceable secondary jets. its only getting about 330 hp at 5k. i think 1200 cfm may be too much ? would quick fuel 450's be a better choice ?
Twin 600 carbs should be fine for a 427. Not sure why you can't tune the carbs, if you have a screwdriver you should be able to tune them. You can drill the secondary plates or buy new ones. It isn't rocket science, just holes in a plate. Smaller carbs might work better if it is a mild street motor but the 600's should work.
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oh well. i guess i will ask some chevy guys what to do. not much help here.
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All the right answers are here. Go to an adjustable secondary plate so you can change jets, or go to bigger carbs. Don't get hung up on the cfm numbers, the engine will take what it needs. Ford used 600+ cfm carbs on their dual 4 setups, with a factory 425HP 427. They ran great. Carl's Ford Parts sells reproductions of those factory carbs, by the way...
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Fuel pressure too high? Blown PV?
There’s nothing wrong with the size of the carbs and the engine could actually use more.
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Leaking float ?
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oh well. i guess i will ask some chevy guys what to do. not much help here.
Tom---With all due respect, I believe your comment above suggests, perhaps, getting off on the wrong foot. You have a significant mass of information/suggestions above, and your comments suggest you DO need help. The plates inside the secondary bowls can be changed, or drilled, and plates set-up for replaceable jets are also available. It seems to me that your local help is likely a bit deficient in knowledge also. Please accept what's said, above, as gospel. It comes from some VERY knowledgeable sources.
My '64 427, new, came from the factory with a pair of 540s.
KS
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oh well. i guess i will ask some chevy guys what to do. not much help here.
That will end up with you with an LS instead of actual tuning information.
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Your "tuner" can't figure out why your fuel pressure is too high or your float leaks so you chose to be rude to the people here willing to help you?
Whatever dude... good luck
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oh well. i guess i will ask some chevy guys what to do. not much help here.
Why is it when someone asks a question and they don't get the answer they THINK is right, they get mad and threaten to use chevy guys to help make power?
My 462ci FE runs stock jetted 1850's and makes 625 hp at 6500 rpm.
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I have a neighbor who runs 2 edlbrokes on a 440 in a A1oo who can`t seem to get them right. He tells me I don`t have a clue to adjusting carbs, but he`s taken his truck to every who knows what there doing and his truck still runs richer than topfueler. He can`t understand how mine starts without running the battery down like his does when its hot and heat soaked. I watched him try to start it at a cruze in this summer and they had to jump start it. He told me I was going to have trouble because it was hot out. Guess what mine rolled over about 6 times and was running. He`s one of those that throws money at stuff and expects it to run out of the box because he read it some place. Listen to the guys on this forum we all have had carb issues at one time or another. We offer advice but your not giving us enough info that we need to sort your problem out.
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I've had rebuild kits (quick fuel) for 600 Holleys with the wrong secondary metering block gaskets. They look & fit perfect, but will drop gas from the transition slots & run rich as hell. If those carbs were rebuilt, I would check on that.
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>I have a neighbor who runs 2 edlbrokes on a 440 in a A1oo who can`t seem to get them right
LOL, the Eds are pretty sensitive to basic adjustment. On mine, I set each for the exact same transition slot exposure, about .020. Then use a vacuum gauge to set each idle mix separately to as close to the exact same vacuum as possible. Then hook the linkage so that each moves exactly together (not progressive on my setup but probably could be used like that) and the linkage set to just slip on/off without moving the primary throttles. With the linkage hooked up, back off the stop on the rear carb and let the front curb idle set the idle speed for the pair. Touchy, idles and runs well when set right. If it's off a bit you get the rupp-rupp like it's got a big cam LOL. Fun for car shows, PITA to stage the car on the track.
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oh well. i guess i will ask some chevy guys what to do. not much help here.
WHAT ?