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Author
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Topic: When do you know to jet up or down
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Fastymz
Moderator Posts: 18703
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 06-12-2003 03:33 PM
   
I have a alittle stumble when I let off the gas.
The car starts and runs good.Except when I acc,or let off the gas.Below 3000rpm the seems to stumble just a very alittle,and then again if I let off the gas.I was thinking about jetting up.I have checked and adjusted the idle mixture and the floats and accel, rod. The plugs only have color and the 1st thread. ------------------
SCOOP
oddly obsessed with big scoops on little Mustangs 2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
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ukracer
Gearhead Posts: 151
From: South Wales UK
Registered: Apr 2003
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posted 06-12-2003 03:42 PM
From the symptoms you describe (if I understand correctly) you need slightly more accelerator shot to cure the stumble on acceleration and a little less jet to cure the over-rich stumble as you roll off the gas. I'm sure more replies are on their way!
Cheers, Martin.
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capri man
Gearhead Posts: 6417
From: doerun, ga.
Registered: Nov 2000
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posted 06-12-2003 03:45 PM
ditto martin, what size squrter do you have now ron??------------------
mike r
racing is real
everything else is just a game.
81 capri-7.51 @89mph 1/8
1.54 60 ft.
http://prestage.com/site/site_display.asp?SiteID=141
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Fastymz
Moderator Posts: 18703
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 06-12-2003 04:09 PM
#31 now Mike,I tired a #35 squiter it seem to make it worst.But I'll try it again.
So bigger squiter and smaller jets?
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SCOOP
oddly obsessed with big scoops on little Mustangs 2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
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ukracer
Gearhead Posts: 151
From: South Wales UK
Registered: Apr 2003
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posted 06-12-2003 04:26 PM
If the bigger squirter made it worse *on acceleration* then try a smaller squirter. Too lean AND too rich can both give a stumble so do not always assume that it must be lean. HTH
Cheers, Martin.
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Fastymz
Moderator Posts: 18703
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 06-14-2003 03:11 PM
So far all I've done is lower the front floats alittle and raise the rear alittle.It seems to have helped for some reason.
I'll try a smaller and larger squirter next and see which one makes the car run better.
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Rustang
Gearhead Posts: 733
From: Clarion PA
Registered: Nov 2000
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posted 06-16-2003 05:03 PM
Last summer I took the 750 vac secondary carb off my old Windsor race motor and stuck it directly on my truck's 460. It had a heck of a miss when I first nailed the gas. Everyone told me "more pump shot for that big block". I did and that didn't help. Finally one of my buddies watched the truck from behind when I nailed the gas. There was a poof of black smoke...too much pump shot! So I went from number 35 to something like 26-28 and lived happily ever after  (BTW a #31 squirter does sound big for your combo)------------------
'68 mustang 351 clevor- 10.92@124
'67 Stang, 351W -11.18@118
'69 351C Torino-14.90@100
'78 Pickup 351W-15.56@88
'79 Pickup 460 ET=??
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Fastymz
Moderator Posts: 18703
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 06-16-2003 05:15 PM
I'll try a smaller one and see what happens.Thanks for the info. ------------------
SCOOP
oddly obsessed with big scoops on little Mustangs 2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
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Fastymz
Moderator Posts: 18703
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 07-05-2003 07:31 PM
Just an update I went with the #28 squiter.The motor pulls better below 2500rpm then ever.I can be going along at 5-10mph and floor it.And it will leave about 10 feet of rubber.It never did that before.I also lower the front floats alittle and raise the rear alittle.It seems to have helped for some reason.
There is no more stumble and the car runs better.
BUT,Above 4000rpm it still feels like theres something missing.Like it should have more power there.I'll start working on my timing next.Work just takes up all my time any more.Now if only my wife would get a better paying job so I could stay home all the time. 
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SCOOP 2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8" 3.40 TracLoc. https://mustangsandmore.com/ubb/Fastymz.html
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Ryan Wilke
Gearhead Posts: 2060
From: Stanton, Michigan 49707
Registered: Oct 2000
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posted 07-06-2003 09:36 AM
quote:
Originally posted by Fastymz:
....Work just takes up all my time any more. Now if only my wife would get a better paying job so I could stay home all the time.
....so then you could play with the 30-40K$ of sponsor $$ you'd get from her boss every 6-months; and company-provided a dually-crew cab & A/C'd box trailer to haul the race car back n' forth in....then your life would....have other challenges to face. SCOOP, Life is good. Don't waste time wishin' it was something else.... ..now go supertune on that Stanger of yours!  Good Luck!
Ryan
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Fastymz
Moderator Posts: 18703
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 07-06-2003 04:21 PM
quote:
Originally posted by Ryan Wilke:
....then your life would....have other challenges to face. SCOOP, Life is good. Don't waste time wishin' it was something else.... ..now go supertune on that Stanger of yours! Good Luck!
Ryan
Ryan no worrys about me wasting my time.I try to use all my time having fun.Your darn right life is good.
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SCOOP 2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8" 3.40 TracLoc. https://mustangsandmore.com/ubb/Fastymz.html
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