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Intake!

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Scuzzy
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Intake!

Post #1 by Scuzzy » Mon Oct 28, 2013 12:42 am

Hello all-Scuzzy here n I spent some $ n wondering if I Messed up? Bought a New Offenhauser Dule-Port n had n a 66 C6AF L 1.12 n plannin on Running it on my 300, I have found out I would B better off with a 1.08, Can I use the 1.12? can I Jet it to Work? Needs a Kit but Jumped on it when it was Avalible becouse it is what I wanted. Any Addvice on what to do will B apresiated! If I can Jet it to work what is the Proper Jets? I got a Srod to Run n a 3.50 Rear Gear! Thanks, Scuzzy

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Re: Intake!

Post #2 by Harte3 » Mon Oct 28, 2013 9:45 am

Run the jets that came in it and adjust if needed after driving for a while. There is no one-size-fits-all "proper" jets to start with as not all engines are created equal...manner of driving, condition of engine, and a host of other variables are not the same for every engine.
'83 F150 300, 0.030 over, Offy DP, Holley 4160/1848-1 465 cfm, Comp Cam 260H. P/P head, EFI exhaust manifolds, Walker Y Pipe, Super Cat, Turbo muffler, Recurved DSII, Mallory HyFire 6a, ACCEL Super Stock Coil, Taylor 8mm Wires, EFI plugs.

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THE FRENCHTOWN FLYER
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Re: Intake!

Post #3 by THE FRENCHTOWN FLYER » Mon Oct 28, 2013 10:38 am

Are your carbs 4-barrels? A DP intake manifold requires a 4-V carb.
FORD 300 INLINE SIX - THE BEST KEPT SECRET IN DRAG RACING

Scuzzy
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Re: Intake!

Post #4 by Scuzzy » Mon Oct 28, 2013 11:36 am

Ya I got the 4100 1.12 but think I need the 1.8, the 1.12 is a 600 CFM Carb n the 1.08 is a 400 CFM n Offenhauser Recomends a 400 CFM so just thinking the 1.12 4100 is too Big but I wanted a D.P. instead of n Opin Plenim that didnt have any Power till over 2000 RPM, Got it now so just gona try what I got! I allso got the Fulley Exsaust Manifolds n thinkin of the Chevy Rockers-79 300, Thanks, Scuzzy

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Re: Intake!

Post #5 by woodbutcher » Mon Oct 28, 2013 6:03 pm

:hmmm: Hi Scuzzy.Just a thought here,and if I am wrong,FTF can fire up the flamethrower and roast me like a turkey.Why can`t you do a"NASCAR" on the manifold.Use a restrictor plate.
Should`nt be too hard to do.
Good luck.Have fun.Be safe.
Leo
"People never lie so much as after a hunt,during a war,or before an election".
Otto von Bismarck

Baron Von Ottomatic
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Re: Intake!

Post #6 by Baron Von Ottomatic » Mon Oct 28, 2013 6:26 pm

It isn't the ideal size but should work fine. Try it and see. If a carb is jetted right on for one engine it shouldn't be far off on any other engine, within reason.

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Re: Intake!

Post #7 by Scuzzy » Tue Oct 29, 2013 2:03 am

Hello All, Scuzz agin! Thanks for the Imput! I am gona try what I got-cant see that much difrence in a 400 n a 600 CFM! If nothing elce I can Jet it Down But dont think I will B the First to run a 600 CFM Carb on a 300! Thanks agin! Scuzz

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THE FRENCHTOWN FLYER
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Re: Intake!

Post #8 by THE FRENCHTOWN FLYER » Tue Oct 29, 2013 10:45 am

Don't confuse jet size with cfm ratings. Try it as is as was previously mentioned.
FORD 300 INLINE SIX - THE BEST KEPT SECRET IN DRAG RACING

Harte3
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Re: Intake!

Post #9 by Harte3 » Tue Oct 29, 2013 12:31 pm

"...1.12 4100 is too Big..." Not necessarily.

"...But dont think I will B the First to run a 600 CFM Carb on a 300!" That is correct. A number of folks run 600s. AbandonedBronco is running/testing a Holley 650 cfm spread bore having run a 600 cfm Holley and a 390 cfm Holley on one of his Broncos. i think he is still running a 600 cfm Holley on his other Bronco. F-250 restorer is quite knowledgeable on Autolites and Qjets and is running/testing a Summit branded 600 cfm carb at this time.

It is somewhat of a misconception to view the maximum flow capacity of the carb as too big or too small. Your engine will run on only the primaries a big part of the time. Generally, one won't see the secondaries begin to open until around 2500 rpm to 3000 rpm (on vacuum secondary or air-flap operated carbs) and not attain full opening even at the highest rpm under WOT.
'83 F150 300, 0.030 over, Offy DP, Holley 4160/1848-1 465 cfm, Comp Cam 260H. P/P head, EFI exhaust manifolds, Walker Y Pipe, Super Cat, Turbo muffler, Recurved DSII, Mallory HyFire 6a, ACCEL Super Stock Coil, Taylor 8mm Wires, EFI plugs.

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Re: Intake!

Post #10 by BIG 6 farmer » Tue Oct 29, 2013 2:08 pm

I agree with all here, both carbs. should work fine. But obvious the smaller one would be more responsive at lower speeds. I worry more if you don't heat the bottom of Intake Manifold, you will play heck getting it to run right if you don't. :nod: If you live in a cold climate, pull heated air off Exhaust Manifolds for Carb. to suck. :thumbup: That is a must for winter driving.
83 F 150 SB 4x4 300 six NP 4speed - - 1950 IHC L162 (1&1/2 ton?) - 87 & 88 T-Bird Turbo Coupes - 2000 Triumph Tiger , 76 Honda GL 1000 , & other toys and parts (& junk) -

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Re: Intake!

Post #11 by Scuzzy » Tue Oct 29, 2013 8:00 pm

Seen a Plate that was originaly on a BigBlock with a 4100 that Apears to have a Tube through it to run Water through n asoom that would work 4 Heat under my Carb? I am gona Run an Offy DP n Fuley Ex. Manifolds so got no way to Heat from EX. , Scuzz

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Re: Intake!

Post #12 by Harte3 » Tue Oct 29, 2013 8:27 pm

Offy DPs and Cs both have provision for heat to the manifold...it's the area under the carb where a stock exhaust manifold was intended bolt up. Pretty easy DIY project and have been cussed and discussed here and on the FTE site many times. AbandonedBronco and F-250 restorer have both posted pictures of the ones they have made.
'83 F150 300, 0.030 over, Offy DP, Holley 4160/1848-1 465 cfm, Comp Cam 260H. P/P head, EFI exhaust manifolds, Walker Y Pipe, Super Cat, Turbo muffler, Recurved DSII, Mallory HyFire 6a, ACCEL Super Stock Coil, Taylor 8mm Wires, EFI plugs.

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THE FRENCHTOWN FLYER
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Re: Intake!

Post #13 by THE FRENCHTOWN FLYER » Tue Oct 29, 2013 9:20 pm

Image

You can also tap heat from the exhaust manifolds with a simple "stove" (like dryer duct).
FORD 300 INLINE SIX - THE BEST KEPT SECRET IN DRAG RACING

F-250 Restorer
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Re: Intake!

Post #14 by F-250 Restorer » Thu Oct 31, 2013 8:31 pm

The autolite C6af L originally came on a 352. The 4100 is a great carb. The only problem with them is they are 50+ years old, and have been rebuilt untold number of times, and parts have been changed and there is no master set of serial numbers--that I know of--a person can check to see if you have the correct parts. I assume those books/guides died with Jon from Pony Carbs.

It should have .048 jets. Mine ran best with .046 jets primary. I'll be very surprised if you can even get the secondaries to open. I'd run .050--.052's in the secondaries if you can even get them to open. I say that b/c they are operated by vacuum which flows through the air horn, and it is a persnickety system. Yes, persnickety!

If you have one of those heating plates between the carb and manifold use it. Check Allcarb for jets. Mike's carbs sells them too, but his are hand drilled with a machine burr around the orifice.

**Note: If you can hold the throttle shaft and move it slightly up and down with the carb absolutely stationary, then it needs to have bushings installed and if you don't have it done it will drive you batty trying to get it to run right.

**Note #2: The smaller 1.08 venturi 4100 is 480 cfm, not 400 cfm, as you mentioned. Also, just because you want need a 1.08, be aware there are two vastly dissimilar designs of the 1.08: small block and big block designs. You want the small block design that came on a 289. Run the numbers on website mustang tek to check and know.

**Note #3: The kits usually don't come with the accelerator pump diaphram. It costs extra.

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Re: Intake!

Post #15 by Scuzzy » Sun Nov 03, 2013 2:49 am

Thanks 250 Restorer n All Outhers, Tought my alot about the 4100, I knew I wanted to run a 4100 n bought a 1.12 when it was avalible, I bought it on E-Bay n Probly got in too big a Hurry, but its a Good Clean Carb n looks to be Runnable as it is-Know I probly gota Kit It But will try it n see how n what I got, Probly gona Buy a Kit off E-Bay but there is so many on there n so many difrent prices n just want to Buy as Compleat a Kit as I can. Just gathering Parts right now for a Spring TearDown n back up but would like to have everything here n ready. Thanks agin! Best ting I ever did was Join this Sight! U All R Great! Scuzz

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