|
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
   
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
IP: Logged |
SteveLaRiviere
Administrator Posts: 30756
From: Saco, Maine
Registered: May 99
|
posted 04-01-2002 06:44 PM
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
IP: Logged |
stang106
Gearhead Posts: 707
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001
|
posted 04-01-2002 07:12 PM
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
IP: Logged |
V8 Thumper
Gearhead Posts: 2950
From: Orange, Ca. United States of America
Registered: Dec 2001
|
posted 09-07-2002 05:33 PM
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 
IP: Logged |
stang106
Gearhead Posts: 707
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001
|
posted 09-07-2002 08:15 PM
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------------------
'70 ragtop Stang
351W - 13.70 @104.
IP: Logged |
stang106
Gearhead Posts: 707
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001
|
posted 09-07-2002 08:20 PM
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------------------
'70 ragtop Stang
351W - 13.70 @104.
IP: Logged |
Mustangsandmore Forums
UBBFriend: Email This Page to Someone! 
