NOT sure if I posted this in correct place .But I recently added some granatelli exhaust cut outs to my 54 . It's gt a 355sbc / 700r4 -3:73 10 bolt ONLY 1500 miles on build everything NEW . Any how ,I had an issue with dieseling Thought i would empty tank run some race fuel thru ( in case of carbon problem) .Was using 91 Octane(which I saw many 350 sbc owners complain of same problem) .I ran my fuel out ,filled with 93 Octane. NOW with full tank ,I punched it & it lights off great but around 2-3rd gear it coughs/pops & mostly sputters like it running out of gas . Today it happened (with cutouts open) , when I threw it in neutral( and closed cutouts) it calmed down & kept running . I nursed it home & when I got close WACKED THROTTLE (With cutouts open) & again NOSED over like out of gas ? My initial thought was edelbrock carb ,not keeping up with demand , then checked MSD distributor for being loose ( its tight) . I have a check list I'm going to go through : quickfuel choke adjustment( hanging up) , fuel filter, Plugs ,TIMING .Everything is damn near NEW I never really let loose on it since getting on the road . DID a turnpike 45 minute haul & quick turn around to see how far I can go without issues (NO PROBLEM THEN ) . Now I got issue , anybody have this problem with cutouts ? I believe it's a timing issue myself , but would live to put car on a dyno and punch it to see what's REALLY GOING ON ? ANY IDEAS THOUGHTS ?? LMAO !! ONLY THE DIE HARD HAMBERS MADE IT THRU THIS FAR!! LOL THANKS TO ALL OF MY BROTHERS EITHER WAY!! HAVE A GREAT DAY HAMBERS!!!
My timing light took a **** ,so that's Mondays priority .Not sure about timing specs on custom built engine tho ? The whole engine / trans/ rear are ALL NEW rebuilds . 1500 miles on all . It's been driven very tame for 1500 ,but NOW with cutouts I'm getting into a bit more & trying longer runs to work out issues . I will post timing . Almost wonder if it's good to put car on dyno & see everything at once but the cost is like $800-$1000 I just saw . ONE STEP AT A TIME .
If you let up on the gas as if you were shifting a stick and hit it again does it go? Back in the 70's I had a 57 Panel truck with a real stout 327 with a dual 4 Corvette intake and carbs and electric pump on it. It would pull like a maniac and fall on it's face about the time I needed to shift and pull again and fall on it's face again on the 2/3 shift. I found out that one of the fittings that the guy had put it together with was a natural gas fitting with a small orifice. I fixed that and it ran great and pulled though the gears as long as you were brave enough to stay in it. If you didn't change tanks and or change to a 3/8 line that 5/16 fuel line on a 54 might not handle the needed flow at higher speeds at full throttle. Plus I'd go from one end of the fuel line to the other looking for restrictions such as kinked or smashed lines Dieseling or pre ignition after you shut the key off is usually due to timing or idling too fast. If the cam wants a higher idle speed you may have to add an idle solenoid that kicks on when the key is on but lets the idle speed drop down low enough that the engine doesn't diesel when you shut the key off. That and go buy or borrow a ******** timing light.
THANKS FOR REPLY! It's a 700r4 ,but ONLY when I punch it 2-3rd is when it sputters ( like I'm out of gas ) .I quick threw it in neutral & closed cutouts( toggle sw) & it settled down ,( popped a little ,but ran fine after I sat for a couple minutes) .Went home with cut outs closed ,ran fine ( no jumping on throttle) . BUT close to home ,opened up cutouts & walked it & it coughed like " OUT OF GAS" .Shut switch off & cruised home .Problem is WOT ,no problem at cruising or idle , barely Idles ( lumpy cam sound) . IM SORRY ,THIS IS MY ***** or MAYBE ITS THE OTHER WAY AROUND ,LOL !!
Tom ,I'm gonna hit highway , ( NO CUT OUTS) & SEE how she does . FULL throttle , p***ing gear , the whole nut .This will separate cut out s .Then head to get timing light & see where timings at . Good reason to go fast for the day !
What are you running for a fuel pump, and what is the fuel pressure? Give us every gorrey detail about the fuel system and ignition system.
The thing you need to determine; is your problem fuel or ignition. I fought a Bronco one time that I was sure was running out of fuel on acceleration. It finally quit and wouldn't restart, but while I was testing it fired up and ran (that threw a monkey wrench in the diagnostic process). Turned out to be a weak coil. Under load it didn't put out enough voltage to keep the plugs lit. Other than swap-tronics, the best way to test a coil is with a scope.
Well it all started trying to run tank down, to put higher octane to eliminate dieseling problem 9q Octane . Then in traffic she died . Started 3x ,but that was it . Then when git to gas station , put 93 ( premium ) in . Then tested fuel gauge ( good ) .Now time to Drain a little ( watch fuel gauge) But when I got into it. Bog ,sputter , ( like out of gas) . KILLED exhaust cutouts & it finally came around sitting & Iding . Baby d home . Walked 1 x close to home & same thing , wants to die ( like NO GAS) !??
No ,new tank ,new line .All metal from tank to mechanical Edelbrock pump .then AN hose from pump to Quickfuel 680ss carb .
Bad fuel pump? Or look for something like a rotted gas hose (****ing air) since the problem is erratic-ish. My car has a stout 355 with the 5/16" fuel line. It pulls hard up to 5500 and flattens out. I need to go with a 3/8" line otherwise it performs well.
Yeah I have 3/8" line .My first thought was edelbrock mech pump not able to keep up with the demand .Gonna start with visual , Choke , plugs ,vacuum lines & timing .Run it without cutouts open , seemed to only do it with cutouts open ,that's what's got me scratching my head .thanks for that idea!
Are your fuel lines routed anywhere near the exhaust cut-outs you installed? Correct fuel pressure is important, but also check the fuel volume as well. If there's a restriction somewhere the pressure may still look good but the volume can drop.
Yes they are inside frame rail .And cutouts dump is 2-3" away . I could wrap the fuel line with some heat shield I got.
Don't forget that cutouts change the airflow characteristics of the engine. If your base exhaust is restrictive and carbs jetted for that setup then when the cutouts are opened the carb will be pulling more air and may run out of fuel/ go lean. After a spirited run with the cutouts open what do the plugs look like?
Thanks ,That is going on the check list as well as vaporlock for cutouts being close to fuel line . So far only checked choke linkage bind ( ground the billet airliner for full clearance . Ran engine ,fuel 6psi at cold start .after running and bringing up to temp ,gauge read 2 psi . NOT fluid filled.Ordered Aeromotive fluid filled gauge with equalizer vent to get correct fuel psi reading .Problem with sending unit ,so draining tank & checking that too .Gauge good. But that's another story. Tank/fuel/ filter , probly while tank down ,pull edelbrock pump & check diaphram .if good then ****on up & go to fuel psi check ,wrap heat protective cloth around fuel line ,then to timing ,carb .floats looked filled half in gl*** of Quickfuel 680ss carb.
Methodically test the fuel system. Check volume by removing the line between fuel pump and carb, putting it in a container and cranking the engine. Disable the spark while doing it so no fire. Should get a pint or so of fuel in 15 sec of good cranking. Then check pressure (although you already know it'll pump 6#). The volume really matters, and may start out pumping great then fall way off after a few seconds...means a restriction (filter?) , pump or line problem (kink?). One step at a time .
ROGER THAT! But also I need to remember that the thing ran fine at cruising 35- 60mph ,not a hiccup. But when I nailed it from the green ( with cutouts open ) that's when it fell on its face after 2nd gear it was like NO FUEL (spit & sputter) .I got out of it,closed cutouts and coasted & it returned to idle on side of road .let it idle a bit ,put back into gear & home we went about 5-6 miles without any problems ( cutouts closed) .I said HMMMM WTF do we got goin on here . Previously it had a dieseling problem ( wanted to run after key shut off ) that was on 91 octane . I ran it outta gas & filled with 93 octane . Then had the problem described above . Maybe I didn't mention the whole story ,but I thought I did.Car is up in air & ready for checks .MAN I APPRECIATE ALL THE IDEAS & HELP CHECKS FROM YOU GUYS!! THANK YOU VERY MUCH !! HOPE TO NAIL THIS PROBLEM AND CLEAR OUR HEADS FROM IT.
We will see ,when new gauge gets here. Not sure where I got the gauge it jumps around ,then settles at 6# ,but like I said after warmed up .......read 2# ,if that readings right ,there's no filter and its a stock 54 tank with gravity feed ( line come right outta tank & along frame to edwlbrock mechanical pump ,up to earls billet filter ( little black thing) .to gauge,then Carb. One said maybe when I punched it ALL the fuel sloshed back in tank & you voided the line of fuel. The tank was pretty full ,so I don't know about that. Wish you car was that fast ,but I doubt it .
I believe the stock caps are vented ,you CANNOT loosen they are either locked on or unlocked to which they will fall off . This was on another forum " As stated all 50s cars had vented caps. On occasion a radiator cap would be subs***uted and all kinds of problems would develop."
Does sound like the pump going bad. I've had them go in and out while driving instead of just completely quiting. Sure makes you scratch your head until you can watch the fuel pressure. On a side note the cutouts will make it run leaner as previously mentioned. I've got a gl***pack on my truck and just pulling it off without adjusting the carb makes it run like a bag of ****. May want to tune it with the cutouts open then it should run ok either way.
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