aftermarket carb???

feel the need to change or modify your mutt? This is the place to discuss it.

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Re: aftermarket carb???

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Re: aftermarket carb???

Postby moose53 » July 13th, 2010, 1:07 am

I've mixed jet fuel and diesel in my truck and it worked pretty well.... I wouldn't put gasoline in there though.

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Re: aftermarket carb???

Postby sherwan_88 » July 13th, 2010, 1:31 pm

There is a tried and tested method of increasing diesel performance which is Lpg Fumigation. 4-5k US. Works miracles but quite expensive..
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Re: aftermarket carb???

Postby rickf » July 13th, 2010, 4:37 pm

You can also do nitrous injection in a diesel. There are many ways to improve performance in a diesel. The methods vary depending on whether you have manual injection, computer controls and injectors, (Ford Powerstroke) Etc.. The basics apply to all engines be it diesel or gas of LPG. More fuel plus more air equals more power. Where you run into problems is with engine mechanical integrity. Will the head gaskets hold the additional pressure? Will the exhaust gas temperature melt the pistons? Can the bottom end stand up to the pounding? It is pretty easy to get more power in a diesel but the block and heads are the limiting factor usually. Moose, you want to be careful with the jet fuel since it is closer to kerosene than to diesel. Kerosene has very little lubricity, it is actually a damn good solvent and will destroy the injection pump and injectors in a hurry. I assume you are mixing it into the fuel in the winter. Keep in mind that winter diesel which is used in all of the northern states in the winter is a blend of #1 and #2 diesel so it is already thinned at the pump. Also, the cetane rating is substantially lower for kerosene and jet fuel. Even winter mix is lower cetane. Ever notice how much MPG you lose in the winter? I consistently lose 3 MPG in the winter and get it back in the spring, every year.

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Re: aftermarket carb???

Postby raymond » July 13th, 2010, 5:09 pm

The best way to deal with fuel gelling in the winter is to pretreat #2 diesel with a pour point depressant. You don't loose power or mileage.
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Re: aftermarket carb???

Postby sherwan_88 » July 14th, 2010, 1:36 pm

rickf wrote:You can also do nitrous injection in a diesel. There are many ways to improve performance in a diesel. The methods vary depending on whether you have manual injection, computer controls and injectors, (Ford Powerstroke) Etc.. The basics apply to all engines be it diesel or gas of LPG. More fuel plus more air equals more power. Where you run into problems is with engine mechanical integrity. Will the head gaskets hold the additional pressure? Will the exhaust gas temperature melt the pistons? Can the bottom end stand up to the pounding? It is pretty easy to get more power in a diesel but the block and heads are the limiting factor usually.
Rick


Older diesels (Pre 90's) were very comfortable with upgrades and modifications, though the newer one's are far more easier as you can tinker with the electronics and get it to put out more, but put in something unknown to it and its a swan. While the older one's were made out of steel and could handle the pounding and little electronics so a lot could be done there, the pump could be modified easily especially the inline ones. I have a Nissan diesel, its gutless in terms of acceleration but I'm sure when i pulled out the mutt for the very first time out of a mud field where the guy (from whom i bought it) had parked, the wheels, gearbox and engine were locked up with rust. I pulled it all the way (20 miles) to the workshop without even noticing i was dragging a 1.25 ton vehicle.
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Re: aftermarket carb???

Postby jim4164 » February 1st, 2017, 1:22 am

I use my mutt up in the Sierra over 6,000 feet and up to 9,000 feet. It runs somewhat rich and I'm wondering how to adjust the Zenith carburetor to lean out the mixture for high altitude running. There doesn't seem to be a needle valve that can be adjusted. Does any one out there have ideas for a solution?
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Re: aftermarket carb???

Postby Horst » February 1st, 2017, 2:10 am

Had the same issue on our two trips into the French and Italian Alps. Always running rich. Other than adjusting the idle mixture, which of course is also affecting mid range too, there are no other adjustments. I guess the only chance you have is changing out the main jet into a smaller one. Depends on what carbuertor version you have. If it is the pre-emission version, you could use the jet from an emission (later model) carb. As far as I remember, it is one size smaller as the emission carb is running leaner. The spring for the accelerator pump is also differently calibrated.
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Re: aftermarket carb???

Postby rickf » February 1st, 2017, 2:25 pm

There are two main jet sizes, 28 and 30. They are supposed to be in the 13660B and 13660 respectively but I have found them in both. I have the blueprints for the carbs, there are a couple other jets that can be modified but it is not worth it unless you live there all the time or you keep a separate carb for high altitude running. I am just now getting back on the computer after my back surgery and the time on is limited so I will look those prints up when I can.
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Re: aftermarket carb???

Postby jim4164 » February 1st, 2017, 4:53 pm

Thanks, Horst. I keep my mutt up in the Sierra at my camp during the warmer months and store it at a friend's place down in the Topaz Lake area during the colder months. The camp can get up to 20 feet of winter snow accumulation and that could bury and crush the vehicle if it's not removed to a safer parking place. Your information is very helpful and I appreciate the details you can supply. I live in the Los Angeles area and won't be visiting the mutt until early Spring. Then I'll see if I can identify the specific carburetor I have. Sorry to hear about your surgery and hope your recovery will be swift and sure.

Symptoms of Rich Running: My impression of what I suspect is a too rich carburetor setting results from driving it last summer, its first season at the camp. It idles smoothly at low RPM. It also runs fine at normal driving speeds. When driving very slowly or starting from a stop, the engine bogs down and stalls when I attempt to accelerate. It will start again only if I hold the throttle wide open while cranking the starter. Then it takes a few seconds of exercising the throttle to clear out the engine, some smoke being evident from the exhaust, after which it will settle into a nice slow idle. To avoid bogging I have learned to move off from a stop using more throttle and initially slipping the clutch. It would be nice to eliminate the slow speed bogging.
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Re: aftermarket carb???

Postby rickf » February 2nd, 2017, 3:51 pm

That sounds to me like a very common problem being the accelerator pump has gone bad. With it in neutral can you stab the gas pedal and have it immediately jump to high rpm? If not then the pump may be the culprit. At high altitude and a vacuum operated accelerator pump you will have a little less of a shot but I have never heard of it causing flooding. 6-9K feet should not affect the acceleration to the point of flooding, unless the float is set too high. I know many of these vehicles that have run very high altitudes with very little issues besides poor mileage and a bit of smoke at wide open throttle.
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Re: aftermarket carb???

Postby jim4164 » February 2nd, 2017, 4:33 pm

That sounds like good news, Horst! I'd still like to see the carburetor drawings, just in case. Also, If the accelerator pump is bad (sounds like a good guess) how do I fix that pump, or must it be replaced? If you are located in Europe you must be near the Alps where you would have seen mutts operating normally at very high altitudes.
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Re: aftermarket carb???

Postby rickf » February 2nd, 2017, 8:37 pm

You are mixing me up with Horst. I have the drawings and they are not going to show much more than what I am telling you. Horst has driven his mutt over the Alps on their annual ride for the last several years so he will be able to give you a lot of information. PM me an e-mail address for the drawings and as I said, I am just barely back on my feet so you will have to give me time on that.
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Re: aftermarket carb???

Postby jim4164 » February 3rd, 2017, 12:00 am

Please accept my apology, Rick. I'm new at this and lost track of with whom I was corresponding. Thanks for clarifying this communication. I'll send you a PM with my e-mail address.
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