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Author
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Topic: stock vs aluminum intake
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thedave66
Gearhead Posts: 244
From: mountain home, idaho
Registered: Sep 2001
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posted 03-06-2002 10:58 PM
   
2 questions. I just put a edelbrock performer intake on my car and damn it woke it up. But it seems like it may be running rich now. Does opening up the intake richen up a carb? I'm thinking on jetting down again but want to make sure. second, why is it on the origional intake the very last water passage is blocked off? That seems kind of odd to me. dave
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Fastback68
Gearhead Posts: 1564
From: Sucat, Paranaque, Philippines
Registered: Jul 99
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posted 03-07-2002 12:06 AM
quote:
second, why is it on the origional intake the very last water passage is blocked off? That seems kind of odd to me.
The explanation I've heard (and I'm curious if the experts will agree) is that engines headed for cold climates had the passages blocked off, but those in hot places had them opened. I have a blocked passage on each side, and I'm wondering whether I should open them up.
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V8 Thumper
Gearhead Posts: 3267
From: Orange, Ca. United States of America
Registered: Dec 2001
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posted 03-07-2002 08:14 AM
quote:
Originally posted by thedave66:
I'm thinking on jetting down again but want to make sure. dave
A set of headers will lean it right back out again  What carb are you running?
Has your mainfold vaccum dropped? Tried a simple idle mixture adjustment?
Greater plenum/runner volume will provide more efficient cylinder fill, which if your carb was borderline over-jetted before, could be acting rich now. Are ALL 8 plugs all black and sooty? Running stock ignition? Last one, I promise: What is your timing totaled out at? [This message has been edited by V8 Thumper (edited 03-07-2002).]
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thedave66
Gearhead Posts: 244
From: mountain home, idaho
Registered: Sep 2001
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posted 03-07-2002 05:32 PM
already got headers  Timings set for about 10 degrees, stock ignition with vacuum advance. Don't know if the vacuum has dropped, i'm running a edelbrock 600 leaned 2 stages with the purple secondary springs. Thats all I can think of at the moment. dave
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V8 Thumper
Gearhead Posts: 3267
From: Orange, Ca. United States of America
Registered: Dec 2001
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posted 03-07-2002 08:04 PM
...and it's still rich? hmmmmmm...Time to do a plug read... Running rich at idle, under power, or WOT? You are moving alot more a/f volume through that motor now, maybe more than that breaker-point distributor can keep up with... may need more ignition zap. Purple springs? I'm not familiar with that color code... what "Hg rating do they have?
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thedave66
Gearhead Posts: 244
From: mountain home, idaho
Registered: Sep 2001
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posted 03-07-2002 09:12 PM
i can't remember off the top of my head but they're the third lowest of the spring kit. So i'm thinking 5 perhaps? I'm going to try jetting down the secondaries, see how that works, and go from there. dave
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Moneymaker
Administrator Posts: 19611
From: Lyons, IL, USA
Registered: May 99
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posted 03-08-2002 12:25 PM
The intake would NOT richen it up. If anything it would be the opposite. Try the mixture screws and check the float levels. ------------------
Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
US Class Nationals link
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V8 Thumper
Gearhead Posts: 3267
From: Orange, Ca. United States of America
Registered: Dec 2001
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posted 03-08-2002 03:00 PM
quote:
Originally posted by Moneymaker:
The intake would NOT richen it up. If anything it would be the opposite...
The Man has spoken... disregard all of my bs! Alex, can you go deeper with this?
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Fastymz
Moderator Posts: 10683
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 03-08-2002 03:15 PM
Dosen't an after market intake allow more air in the runner do the larger area.I know on my car,wth the stock intake it ran to rich with the carter carb.I added the RPM inake and headers and ext.And it seems to be running just right,never changed the jets or rods. SCOOP ------------------
65 coupe,1969-351w,RPM intake,Carter625,shorty headers,2.5 exhaust, Flowmasters,C4,open 8" 2:80,Big Boss 429 hood scoop,Crager SS,Black Suede.
MEM#1240 https://mustangsandmore.com/ubb/Fastymz.html
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Moneymaker
Administrator Posts: 19611
From: Lyons, IL, USA
Registered: May 99
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posted 03-08-2002 11:18 PM
It is more efficiant due to larger and longer runners, and therefore will create a stronger signal to the carb. That will cause the carb to want to pull more fuel than it is currently jetted to deliver. OK? ------------------
Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
US Class Nationals link
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