Post Your Max Wedge Combos

[Frustration]

Mainly looking for tuneups for factory cross ram with Edelbrock/Carter-style Carbs. Currently we run a '63 Plymouth Fury. 426 + .060, 12.2:1, Lunatti Solid Roller (.680 lift). Automatic with 4.56:1 gear. 9 1/2" converter (Dynamic). Cal Trac setup with adjustable shocks set on second tightest setting. 90-10 shocks up front on stock suspension. Best ET 10.81 @ 125.1 MPH.

Running 750 CFM Carters. 107 primary jets with 73-47 rod. Secondary .089 and .082. Since we don't run original max wedge carbs, they are turned 90 degrees on our mainfold. I'm wondering if i have the secondary jets on the correct side now (.089 Throttle Side)?

I got away from my original tune-up, but I believe I'm sneaking back up on it. The car only 60 foots in the mid 1.5's on a good day. Lately it's been even worse. Wondering what you can advise to pick up down low, or at the top end. Thanks as always. Tom

 

[Oldreddodge]

Gotta post some pics

 

[NSS Guy]

I run 2 eddy 750's (1407) on a factory crossram. Jetting is primary jets-107 rods-7147
secondary jets- 93/93. My combo is 499ci, little ez heads, 620 roller cam, 8" ati 5500, 4.30 dana, and full TTI exhaust. Car can run 10 teens, but slow it to 10.50 for NSS index.

 

[Frustration]

I run 2 eddy 750's (1407) on a factory crossram. Jetting is primary jets-107 rods-7147
secondary jets- 93/93. My combo is 499ci, little ez heads, 620 roller cam, 8" ati 5500, 4.30 dana, and full TTI exhaust. Car can run 10 teens, but slow it to 10.50 for NSS index.

View attachment 816033 View attachment 816034

Thank you for that. I read in the Mopar engine book that the secondary jets should be .082 and .089...this for a stock combo. I'm more radical than stock, and suspect an increase in secondary jets would pick up the MPH.

 

[cjd1963]

The Super Tricks really set it off...will be putting mine back on too! It looks great!

 

[bobs63wagon]

Mainly looking for tuneups for factory cross ram with Edelbrock/Carter-style Carbs. Currently we run a '63 Plymouth Fury. 426 + .060, 12.2:1, Lunatti Solid Roller (.680 lift). Automatic with 4.56:1 gear. 9 1/2" converter (Dynamic). Cal Trac setup with adjustable shocks set on second tightest setting. 90-10 shocks up front on stock suspension. Best ET 10.81 @ 125.1 MPH.

Running 750 CFM Carters. 107 primary jets with 73-47 rod. Secondary .089 and .082. Since we don't run original max wedge carbs, they are turned 90 degrees on our mainfold. I'm wondering if i have the secondary jets on the correct side now (.089 Throttle Side)?

I got away from my original tune-up, but I believe I'm sneaking back up on it. The car only 60 foots in the mid 1.5's on a good day. Lately it's been even worse. Wondering what you can advise to pick up down low, or at the top end. Thanks as always. Tom

I am only putting my 63 Maxwedge back together now. I was told by another Maxwedge racer that the original 447 carbs had staggered jetting because the carbs starved for fuel under hard acceleration, so they increased the jetting to compensate. So now with your combo not sure if staggered jetting is needed. I bought used Edelbrock 1405's to use the big tops from them on my 447"s. I found the correct drill bit and tap and we drilled out the top to accept another fuel inlet to avoid some of the issues under acceleration. So now I will have the large tops and two fuel inlets for each carb from my regulator. Some racers are taking out the metering rods and I wish I could remember what the extra secondary piece is called (to early in the morning). They are making them lighter (drilling or grinding not sure) to get faster throttle response.

 

[33 IMP]

Turned 90° ? How does that work? Are you using str14 throttle linkage? Or do you mean 180° ? Are your primaries to the inside, the front (str14) or the outside (factory)?
I have a pair of 3705 that need restoration, but i was using 4762s's, carter competition series (no choke, ever). It was a few years ago, and i dont remember the jetting, I'd have to pull them apart to look.
My tuning wouldn't help anyway, you are faster now than i was.

 

[Mike Gaines]

My Max Wedge in 1963. I have no idea what the jets were in the carbs. I just ran it...lol. Best ET was around 12.1xx at 115.xx back in 1963.
I do remember that I set the timing at 8 degrees before top dead center.

 

[Frustration]

Photo is old, but it's the same setup. Carter Comp Series Carbs. I put .089 jets in the secondaries last night. Car didn't even want to run. I have the yellow springs in the metering rod holes. Any input as to which springs are being used...? Jim? I was told a long time ago that you can loosen the tops of the metering rod orifice and turn it sideways, then tighten it back down. That way you can see if the rod is in the up or down position while the car is running. I wonder if my springs are too loose and that's giving me the fatter setup on the primary side before it's needed. Any input is appreciated.

 

[NSS Guy]

I run the stiffest springs with the 7147 rods, not sure of color maybe silver.. You may want to use a vacuum gauge and adjust the idle mixture screws, baseline would be 1 1/2 turns out. You could also use the vacuum gauge to try and sync. carbs.
Nice engine!

 

[stage3]

Any input as to which springs are being used...? Jim? I was told a long time ago that you can loosen the tops of the metering rod orifice and turn it sideways, then tighten it back down. That way you can see if the rod is in the up or down position while the car is running. I wonder if my springs are too loose and that's giving me the fatter setup on the primary side before it's needed.

the way i tuned mine was loosen the screw on the cover plate,and at idle the rods should be down,and instant up when u crack the throttle,i believe i was using the pink springs(litest),but your cam will determine that,mine was a .650 roller.sometimes it cam be hard to determine the exact spring because of vacuum charateristics of various cams,,that system is from dvorac's max wedge tuning manual.

 

[Frustration]

Thanks Jim and Stage 3. Jim, I have changed the fuel lines since the above photo. Hated them from the start, so I made my own hard lines. I love that kind of project. I'm heading out to the garage to mess with this thing now. I'm surprised that the .089 jets I put in the secondaries made it run poorly at idle. They shouldn't really be in the mix at that point. My combo was spot on with the one you described above, except for the secondary jets. I'll tweak it some more. Hoping to get out again in the next couple of weeks. Much appreciated.

 

[NSS Guy]

Secondary jetting should have no effect at idle. Take the tops off and double check floats. Also fuel psi is critical, 5.5-6psi is all you need.

 

[33 IMP]

@bobs63wagon , you do know those 3447 carbs are worth a fortune right? Last i checked, people were asking $1600 a pair. I would consider putting them back to stock, and running a couple eddies, but thats just me.
Great luck with your project, I'm trying to get a 62 wagon i know of, to put my max in.

 

[Frustration]

Jim, The needle and seat on one of the carbs was stuck. There was no booster shot, basically making the car run on one carb. I didn't have a spare, but I wanted to put our spare Edelbrocks on for a while. I switched my entire combo from the Carters to the Eddies and ran .089 jets in the secondaries (starting there, but have sets to go up to your .093). It started and seems to run great. Hoping to get to Cecil County Saturday to run a "United Nostalgia Stock and Super Stock" event. It's supposed to be in the mid to upper 70's Saturday. More to come, but I'm confident we'll improve on our 11.81 best. Tom

 

[Frustration]

I run 2 eddy 750's (1407) on a factory crossram. Jetting is primary jets-107 rods-7147
secondary jets- 93/93. My combo is 499ci, little ez heads, 620 roller cam, 8" ati 5500, 4.30 dana, and full TTI exhaust. Car can run 10 teens, but slow it to 10.50 for NSS index.

View attachment 816033 View attachment 816034

When I changed from the Carter Carbs to the Eddi's, I don't seem to get wide-open throttle. I think the linkage in your photo looks to be a lot longer than mine. Do you remember if you had to modify a stock setup for Eddi's? I seem to remember hearing that somewhere.

 

[33 IMP]

Yep the linkage arm lengths are different on an eddie and a carter. We definately talked about that a while back, I'll see if i can find the thread.

 

[moobster]

When I changed from the Carter Carbs to the Eddi's, I don't seem to get wide-open throttle. I think the linkage in your photo looks to be a lot longer than mine. Do you remember if you had to modify a stock setup for Eddi's? I seem to remember hearing that somewhere.

The throttle arm on the eddys is longer than the arms on the 3705's. you would have to move the holes outwards to fix it at the bell crank, or move the holes in on the throttle arm on the carbs. The secondaries should start to open when the primaries are at 3/4 open.
The staggered jetting is to help correct inefficiencies inside the manifold. When you change these jets try to keep the same, % difference, between them. You can also stagger jet/ stagger rod/ stagger spring, the primaries, but in doing so keep the fatter jet/rod/spring on the throttle side same as the larger secondary jet is always on the throttle side.

 

[33 IMP]

I found it. YOU were the op, @Frustration !
"Max wedge throttle linkage help needed" in the 62-65 thread.

 

[Frustration]

I'd love to know how you found that! Never seems to work for me. Thanks. I'll read it over now.