Re: Alky and timing
[Re: earthmover]
#2106547
07/08/16 10:42 PM
07/08/16 10:42 PM
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Joined: Jan 2003
Posts: 684 St. Charles, MO.
Slingshot383
mopar
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mopar
Joined: Jan 2003
Posts: 684
St. Charles, MO.
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Just start there, and once the fuel is right, tune for best mph.
1994 Undercover Chassis 125" altered
stack injected big block, soon blown and injected
Member of The Torque and Recoil Club
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Re: Alky and timing
[Re: earthmover]
#2107105
07/10/16 01:14 AM
07/10/16 01:14 AM
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Joined: Jan 2003
Posts: 10,008 Frostbitefalls MN (Rocky&Bullw...
gregsdart
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,008
Frostbitefalls MN (Rocky&Bullw...
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I agree, start at 35 degrees, tune the fuel system, then see if it will run the same with 34 or 33 before going beyond 35. I run 34 with 15/1 compression ,alky, 528, 440-1 heads.
Last edited by gregsdart; 07/10/16 01:15 AM.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Alky and timing
[Re: earthmover]
#2108193
07/11/16 10:03 PM
07/11/16 10:03 PM
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Joined: Feb 2008
Posts: 714 Central TEXAS!!!!
sr4440
super stock
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super stock
Joined: Feb 2008
Posts: 714
Central TEXAS!!!!
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I have done a bunch of MFI engines and have found that most people run way more timing and fuel then they need to for max power.
FYI i have a b-1 head 512 and run 32 degrees
Joe
Without Data, you’re just another guy with an opinion.
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Re: Alky and timing
[Re: WedgeFED]
#2108894
07/12/16 06:55 PM
07/12/16 06:55 PM
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Joined: Aug 2007
Posts: 2,449 nc
earthmover
OP
top fuel
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OP
top fuel
Joined: Aug 2007
Posts: 2,449
nc
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Plugs will tell you all you need to know... Use a new plug somewhere in motor(any cylinder will work) for each fuel or timing change. It makes it much easier to read. Got bigger problems now ..changed my old have a 12 qt. Pan put in 10 qts Rotella t6 drain oil in have about 12 13 qts rest is alky..I'm bout done with this lol but new with it at the same time
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Re: Alky and timing
[Re: B1HEAD_USER]
#2108975
07/12/16 09:08 PM
07/12/16 09:08 PM
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Joined: Jan 2003
Posts: 5,762 Hot Rod Ridge
FastmOp
master
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master
Joined: Jan 2003
Posts: 5,762
Hot Rod Ridge
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Run Delo oil till you get it lined out, only out 25 bux for 2 gallons
Last edited by FastmOp; 07/12/16 09:19 PM.
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Re: Alky and timing
[Re: earthmover]
#2109004
07/12/16 09:59 PM
07/12/16 09:59 PM
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Joined: Jan 2003
Posts: 10,008 Frostbitefalls MN (Rocky&Bullw...
gregsdart
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,008
Frostbitefalls MN (Rocky&Bullw...
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Start lean at idle, adding fuel till it will not hesitate when you crack the throttle below the temp you want to race at. I lean my motor out for warmup till the exhaust temps get up to 950/1000 degrees. That won't happen till the motor starts to warm up a little, I see about 500 leaned out on a cold start and keep leaning it out as it warms. After a run I make sure the motor is hot enough to clear water and fuel out of the oil, somewhere over 180 to 210.
Last edited by gregsdart; 07/12/16 10:01 PM.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Alky and timing
[Re: sccuda]
#2109006
07/12/16 10:09 PM
07/12/16 10:09 PM
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Joined: Aug 2007
Posts: 2,449 nc
earthmover
OP
top fuel
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OP
top fuel
Joined: Aug 2007
Posts: 2,449
nc
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What percentage of leak down did you set the Barrel Valve to? 22 percent ran fine
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Re: Alky and timing
[Re: earthmover]
#2109045
07/12/16 10:53 PM
07/12/16 10:53 PM
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Joined: Feb 2008
Posts: 714 Central TEXAS!!!!
sr4440
super stock
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super stock
Joined: Feb 2008
Posts: 714
Central TEXAS!!!!
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I use a leak down for 2 things, get a starting point and finding out where i ended up at. That being said, I would start the car up and use the fuel shut off valve to lean it out until it reached operating temp. Then once you are at operating temp, put the lean out in normal run position. Now you need to shorten the linkage between the barrel valve and throttle linkage a couple of "flats". now you going to "wack" the throttle to see if the engine still responds. If it does then lean a couple more flats and repeat until it stumbles. once it stumbles add flats until it doesn't, then add two more flats and you are set. Now check your leak down for future reference. if at any time the idle gets to high, use the throttle blade to close the air gap. the idle screw is for idle speed, the barrel valve is to set the idle A/F ratio. DO NOT USE THE BARREL VALVE TO SET YOUR IDLE SPEED.
some notes, each engine has a different leak % due to pump size, idle check valve pressure and of course cam. i also have customers bring their own leak down gauge, they all read different.
one more thing, can you post a pic of your engine? mostly want to see where the fuel lines are running.
Last edited by sr4440; 07/12/16 10:58 PM.
Without Data, you’re just another guy with an opinion.
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