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Author
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Topic: Hesitation on take off - RPMs at idle?
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mach1driver
Journeyman Posts: 48
From: charlotte nc
Registered: Aug 2004
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posted 03-05-2005 02:43 PM
   
I am experiencing a slight hesitation when i floor it from a dead stop. I had a similar problem before, and the guy who built my engine said it was a vacuum leak. I saw him tighten down the hose to fix the leak,we drove it, and it was fine. I checked the hose and it is still fine. I noticed if I set the idle higher, the hestiation is not as bad. I am idling now at around 900 rpms, parked. Any guide lines around idle rmps?72 mach 1
351c
holly 600 cfm
crane cam 268
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Fastymz
Moderator Posts: 18403
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 03-05-2005 02:47 PM
Set idle back to where it was.
Try going up on the nozzle/squirter about two sizes.------------------
oddly obsessed with big scoops on little Mustangs 65 coupe 351w C4 Big Boss 429 hood scoop,8" 3.40 TracLoc. My Pics
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sprcoop
Gearhead Posts: 330
From: Tucson, AZ usa
Registered: Jan 2000
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posted 03-05-2005 11:12 PM
Ron, please believe that I am not questioning your evaluation since I am like Schultz on Hogans Heros, "I know nothing". I just want to understand the logic. If it had the problem, then a vacuum leak fix fixed it, then it came back, how does that lead you to believe that a larger squirter will fix it? It ran fine with the squirter that is in it after the vacuum leak was fixed. I am putting together my first motor and will no doubt be asking all these questions in about a month when I fire it up. Just trying to understand. Thanks.------------------
Jerry Cooper
Candy Apple Red, 66' Coupe, Wide Ratio Toploader
9" 3.10 peg leg now, soon to be Traction Loc
302 Block on the Engine stand
Soon to be 300+ HP
15" Styled Steel Wheels
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exlocal
Gearhead Posts: 134
From: hacienda hts., CA, USA
Registered: Dec 2004
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posted 03-06-2005 12:48 AM
Accelerator pump arm adjustment under the primary bowls. Worn throttle shaft holes in base plate of carb. Both of these were my problems on my 600. Due to my setup, (four speed manual), 1000 rpms is the minimum mine will idle well but car shakes a lot due to lumpy idle. My best idle is 1200 rpms, no shaking at idle. ------------------
reliving youth [This message has been edited by exlocal (edited 03-06-2005).]
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Fastymz
Moderator Posts: 18403
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 03-06-2005 04:47 PM
quote:
Originally posted by sprcoop:
Ron, please believe that I am not questioning your evaluation since I am like Schultz on Hogans Heros, "I know nothing".
We both in the same place. 
Always question that what you don't agree with or understand.
I was just responding to him,
"I am experiencing a slight hesitation when i floor it from a dead stop" this is what helped with my 600vs holley. Going up a size in the nozzle made that go away.
As for the hose that had a vacuum leaked, I'm guessing it was a PCV hose.
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oddly obsessed with big scoops on little Mustangs 65 coupe 351w C4 Big Boss 429 hood scoop,8" 3.40 TracLoc. My Pics
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