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  Jet size? Other problem?

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Author Topic:   Jet size? Other problem?
stang106
Gearhead

Posts: 707
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001

posted 04-01-2002 05:15 PM     Click Here to See the Profile for stang106   Click Here to Email stang106     Edit/Delete Message   Reply w/Quote
I thought I would tune my old 302 a little better since it will be a few months until I get my 351W finished, and Roger may be using it after that. The problem is it is running really rich, the exhaust pipes always black, plugs black. The motor is a very worn out 302 from a '74 Granada with a cast 4V intake and a Holley/Motorcraft carb I rebuilt that looks about 550-600cfm. The primary jet size I think is 61. The jets have 61 and an upsidedown 2 after it stamp on. They do look a tad smaller than #64 jets, which are the smallest in my jet box. I was thinking about going 8-10 jets smaller to start with but if the jets are already #61 do I have another problem?
Thanks, Dave

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SteveLaRiviere
Administrator

Posts: 30756
From: Saco, Maine
Registered: May 99

posted 04-01-2002 06:44 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
I doubt it's a jet problem, stock carbs are usually pretty lean. I'd check the float level and condition. As a matter of fact, I'd replace the float anyway as long as you are rebuilding it.

------------------

'70 Mustang Mach 1 M code 351C 4V/FMX/3.25 open
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip

MCA Member # 47773

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stang106
Gearhead

Posts: 707
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001

posted 04-01-2002 07:12 PM     Click Here to See the Profile for stang106   Click Here to Email stang106     Edit/Delete Message   Reply w/Quote
I have already rebuilt the carb including a new needle assembly. The float is original and is adjusted so there is just a trickle of gas coming out of the plug hole at idle.
I am still thinking the #61 jets are too large for the low compression, smog cammed, worn out motor. Anyone else?
Dave

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V8 Thumper
Gearhead

Posts: 2950
From: Orange, Ca. United States of America
Registered: Dec 2001

posted 09-07-2002 05:33 PM     Click Here to See the Profile for V8 Thumper   Click Here to Email V8 Thumper     Edit/Delete Message   Reply w/Quote
How old is the air filter? That's a 10" diamater choke butterfly if its loaded up (restrictive). You could try one step hotter spark plugs too

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stang106
Gearhead

Posts: 707
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001

posted 09-07-2002 08:15 PM     Click Here to See the Profile for stang106   Click Here to Email stang106     Edit/Delete Message   Reply w/Quote
WOW, you guys dug up an old post! That motor is now in Roger's '85 T-Bird with full length headers and good exhaust. Roger said that the float is sunk so we have some more work to do; also I was going to richen the primary jets for him now. A week ago Roger blew a head gasket and while the heads were off I did a quick port job as it needed new valve seals anyway. Thanks anyways,
Dave

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'70 ragtop Stang
351W - 13.70 @104.

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stang106
Gearhead

Posts: 707
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001

posted 09-07-2002 08:20 PM     Click Here to See the Profile for stang106   Click Here to Email stang106     Edit/Delete Message   Reply w/Quote
Steve,
I should have listened to you (read from you?) from your original reccomendation. One thing I do know is that there is a heck of alot I need to know!
Dave

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'70 ragtop Stang
351W - 13.70 @104.

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