Holley 4160 750cfm
Thread Starter
Racer
Joined: Mar 2006
Posts: 313
Likes: 0
From: Fairfield PA
In the EDL book the rod/jet graph changes are like 4% steps. So I got some online calculator for area of a circle. then it is just simple math. The area of the jet hole minus the area of the stepped metering rod is the amount of flow. The rod has two diameters the larger is the lean cruise high vacuum holding the rod piston down. When vacuum goes away, the spring lifts the piston/rod to its smaller diameter causing a richer condition.
So figure out the existing area of your two stepped rod and the area of your jet. So if you are rich you can look through the rod and jet chart and make very fine adjustments when you do the math for area of flow for both cruise and under power.
I replaced my Vettes 1411 after ten years of extreme heat and abuse. The venturi wall cracked and flooded my motor
So figure out the existing area of your two stepped rod and the area of your jet. So if you are rich you can look through the rod and jet chart and make very fine adjustments when you do the math for area of flow for both cruise and under power.
I replaced my Vettes 1411 after ten years of extreme heat and abuse. The venturi wall cracked and flooded my motor
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
I made the wrong assumption that it was new 1411 and you couldn't get it going.
My 1411 looks perfect because you can't really see the hair line crack. the aluminum casting just gave out from many years of heat expansion cycles.
I removed the choke and had a few other mods like the 90 degree fuel inlet
My 1411 looks perfect because you can't really see the hair line crack. the aluminum casting just gave out from many years of heat expansion cycles.
I removed the choke and had a few other mods like the 90 degree fuel inlet
Burning Brakes
Joined: Dec 2003
Posts: 1,004
Likes: 7
From: Adelaide South Australia
11Jake.... Interesting that you appear to be happy with AFR of 14 to 15 
IMO that is extremely lean?
My afr's are set to 12.5~12.8 which I consider a safe street tune.
Maybe that's why I'm down from claimed power ?
ps, sorry about thread stealing .... :o
IMO that is extremely lean?
My afr's are set to 12.5~12.8 which I consider a safe street tune.
Maybe that's why I'm down from claimed power ?
ps, sorry about thread stealing .... :o
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Close to 14.7 is perfect for cruising down the freeway. Max power at WOT should drop to near 12.2
Thread Starter
Racer
Joined: Mar 2006
Posts: 313
Likes: 0
From: Fairfield PA
Ozzy Tom if you are running 12.5 12.8 you are so rich that you are almost off the readding on my A/F meter. 14.7 readding is exactly what gkull said, good for cruising and you want a little richer when WOT.
Burning Brakes
Joined: Dec 2003
Posts: 1,004
Likes: 7
From: Adelaide South Australia
I am assuming your quote of AFR ~ 14.7 is whilst cruising, NOT at WOT .... correct?
In which case that's fine. My misunderstanding.
cheers
tom
Thread Starter
Racer
Joined: Mar 2006
Posts: 313
Likes: 0
From: Fairfield PA
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Thread Starter
Racer
Joined: Mar 2006
Posts: 313
Likes: 0
From: Fairfield PA
Update:
I installed the Holley this weekend. What a HUGE difference over the Edelbrock carb. I haven't even fine tuned the holley carb. and it outperforms the edelbrock. Without fine tuning the carb it is really close to 14.7 reading on my A/F meter, running just a little rich right know. It idles smoother and runs great a WOT. Only problem I have is the Holley carb. does not have a option to hookup the hose for the PCV. I installed a fitting in the aircleaner but it is not pulling enough vacuum at idle on the PCV valve and it has a slight odor. Anyone else have this problem? If so what was your fix?
I installed the Holley this weekend. What a HUGE difference over the Edelbrock carb. I haven't even fine tuned the holley carb. and it outperforms the edelbrock. Without fine tuning the carb it is really close to 14.7 reading on my A/F meter, running just a little rich right know. It idles smoother and runs great a WOT. Only problem I have is the Holley carb. does not have a option to hookup the hose for the PCV. I installed a fitting in the aircleaner but it is not pulling enough vacuum at idle on the PCV valve and it has a slight odor. Anyone else have this problem? If so what was your fix?
Le Mans Master
Joined: Apr 2006
Posts: 5,403
Likes: 95
You might want to pick up a HLY-20-13 spring kit secondaries may
be opening later then they should be. www.summitracing.com.
be opening later then they should be. www.summitracing.com.
1406, 1813, 4150, 750, acceleration, adjustments, carb, double, edelbrock, eldelbrock, hesitation, holley, hp, massive, pumper, stumbles
