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Tractor Pulling Discussion Forum

Which Carb is Best?

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Hank MO

07-16-2004 05:57:03




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I need to replace the carburetor on my tractor and would like to get the best performing one I can (within $'s). It's about a 1 1/2 - 1 5/8 throttle bore, updraft. I've found some Zenith, Stromberg, Tillotson and Marvel Shebler models that I think will fit. My question to you all is based upon your experience which of these manufacturers makes the best carb? Or can you point me to a better source for a carb?
I'm not trying to start a carb war on this site, just looking for educated opinions. I'm not a puller either (not yet at least) and am looking for a work tractor setup. I figure you guys will have the most experience in this sort of performance upgrade.
Thanks.

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ChadS

07-16-2004 22:39:35




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 Re: Which Carb is Best? in reply to Hank MO, 07-16-2004 05:57:03  
It has nothing to do with what brand is best, it is what works for your engine, not the nieghbors down the street who has the same tractor, your engine. Certain factors are needed to guestimate the proper carb. Most junk the stock carb, and put on the big one, HA! Loss of power, unless it it is a high dollar stroker. Tell u what, u want experienced answers, tell us more about what u have, then maybe, just maybe, we can get a grasp on what you are dealing with. I know this sounds rash,, but it is like shooting pool with a rope on that one. Been working on all of the above carbs at one point or another, Details, please, make model, stock or modified, compression readings, fuel specs, you want experienced advice, you may found it if you are lookin hard enough. ChadS

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Hank MO

07-19-2004 04:59:55




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 Re: Re: Which Carb is Best? in reply to ChadS, 07-16-2004 22:39:35  
ChadS,

Point taken. Ford 8N Funk, 6 cylinder 226 flathead engine. 100% stock, right now. Compression 6.8 : 1 (specified not measured). 90 octane gas (maybe higher in the future). Engine runs well right now, but is VERY choked for air in and exhaust out (as most flatheads are).

I'm looking to flip the manifolds to run exhaust straight up and change to updraft carb. Stock carb is the Holley 847 (downdraft). I've seen a Stromberg and Zenith that would appear to bolt up to existing system, and a Marvel Schebler, Tillotson, and Zenith that would bolt up with minor mods (I don't have model numbers). Right now I'm trying to relieve the breathing problem this engine suffers from. The stock 847 has more than enough fuel supply for the current setup (i.e. it's easy to run too rich).

Future work(?): electronic ignition, longer connecting rods (not more than 8 or 9 compression), port and polish head/block. No intention to build a high dollar stroker. Cams and cranks are not likely available, and don't want to pay high $ for custom jobs.

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ChadS

07-22-2004 06:06:24




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 Re: Re: Re: Which Carb is Best? in reply to Hank MO, 07-19-2004 04:59:55  
I hear ya, My brother in law has a Massey 101 with a crysler flathead 6. I have tried 3 different models sizes of carbs on it, from an IH shebler, a Smaller Zenith, but, to no avail, the original carb a Shebler, was the best for it. it is just over 300ci, and has a torque curve that wont quit. From what I have learned, they breathe in a slightly different mannor, and the smaller carbs work on them. I dont have the part number off it at the moment, but it has a very long throat on the carb, but it is small in diameter, A few guys around here,, have both versions of the funks conversion, V8, and 6, sweet looking machines,, Always wondered if a 302 would bolt into one of these tractors,,,,, ,, Most advice I would give you is to check compression, see waht you are dealing with, under 200 psi, use a better octane fuel, and rejet the carb,, now u mentioned that u can get plenty of fuel,, is this from the stock carb, or did u modify it to flow? The chrysler,, is simular to the ford 6, in running characteristics, I classify these engines along with the wisconsin engines as far as parts design, they have lite rods and pistons, so no torque gain from them, hp,, fine tuned, lets say with 150psi, you are looking at 45-55 hp, but it will be a good strong HP, just due to mods u have done. Electronic igntion,, yes, do it, if they make the kit for it, when u do this, you lose the condensor,, and that alone doubles the coil output to the plugs. MSD can run with points to act as the trigger, use no condensor, the points are the trigger, the MSD takes over the rest. Way better starting,, and it seemed to smooth out the fuel jetting. Before, it could not take fuel enrichment, it would foul the plugs, since, opening up the plug gap, and the MSD, it will take the fuel it gets set at on the dyno. ChadS

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Hank MO

07-23-2004 05:14:28




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 Re: Re: Re: Re: Which Carb is Best? in reply to ChadS, 07-22-2004 06:06:24  
Thanks! You can get a kit to bolt a 302 onto one of these. Check out this site... he's bolted on a lot more than that!
Link

The Holley 847 downdraft is bone stock... or at least I havn't done anything to it yet. I believe they also used this carb on the V8 flatheads. Most people who modify the V8's have a number of intake manifolds to chose from to run any carb setup they want (I've seen 6 single barrel downdrafts!!!). Anyway for my 226 I wouldn't need that, just looking for a good updraft to replace it with.
I can get more than enough fuel, but I think that's cause I'm currently starved for air. When I resolve all my breathing problems I think a carb similar to the 847 will be acceptable. My breathing problems are: exhaust reduced from 2.5" manifold outlet to 1.25" exhaust pipe. Two sharp 90 degree bends in exhaust pipe. Intake restricted by "farmer fixit" intake setup. (old "pan" on top of carb must have rusted out and gotten removed, was rigged to work after that) Anyway intake is roughly equivelant to 1" ID pipe run about 2' with several bends. Not to include the oil bath air filter.
Ford claimed 95 hp at ~2300 rpm, and 180 lb/ft at 1500 rpm... but that's a factory claim. No doubt in my mind its not running that now. It is running much stronger than 4 cylinder 8N no doubt in my mind.
Yes, light rods and pistons. I havn't opened the engine to see if it can be bored from stock 3.3" to 3 5/16", which would allow me to use the abundance of pistons available for the flathead V8's! Don't know how close my piston is to the top of the jug and rod clearance with the jub, but if I've got some room for a longer rod I can bump up compression easily that way.
If the Pertronix kit is available (electronic ignition) that's the way I'll go, if not thanks for the info on the MSD.
My understanding of the real holdup from keeping this tractor from pulling good is gearing / tires. If I get some larger diameter and width tires (i.e. max allowable) then I'll have to run the engine at low rpm to keep from going over speed limit. Rear differential is 6.66 to 1 and I don't know of a way to make this higher on this tractor. Also don't know of any gear changes available to the transmission to lower the gearing. Custom stuff costs $'s and then it may not work out just right. My Funk may be resigned to spending all it's days brushogging my fields. Does that real good though!
Thanks for the assistance.

Hank

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ChadS

07-30-2004 22:16:19




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 Re: Re: Re: Re: Re: Which Carb is Best? in reply to Hank MO, 07-23-2004 05:14:28  
Could any other rear end parts be used to beef up the rear ends? ChadS



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