whats that mean then...it was rebuilt like 4 months ago...but maybe the jets are bad???
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| mpg investigation https://www.slantsix.org/forum/viewtopic.php?t=23103 |
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| Author: | DusterBuster [ Tue May 08, 2007 1:36 pm ] |
| Post subject: | mpg investigation |
still tryin to get to the bottom of the 8 mpg..and i was wondering on a holley 1920..is the gas suppose to spray or stream in...cause i took a look at mine and it streams into the engine..just asking i don't know jack squat about carbs. thnks |
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| Author: | oldgoat83 [ Tue May 08, 2007 1:42 pm ] |
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Should be spray. |
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| Author: | DusterBuster [ Tue May 08, 2007 1:43 pm ] |
| Post subject: | |
| whats that mean then...it was rebuilt like 4 months ago...but maybe the jets are bad???
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| Author: | Doc [ Tue May 08, 2007 1:47 pm ] |
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More likely.... whoever rebuilt it was "bad".  DD |
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| Author: | DusterBuster [ Tue May 08, 2007 1:49 pm ] |
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well heck..that suck  i guess its time to drop more money into the money pit lol
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| Author: | oldgoat83 [ Tue May 08, 2007 2:01 pm ] |
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I might suggest you do some research on carburetion. There are lots of places online, including here about the subject. Get a general idea of what's supposed to happen. Then buy a new rebuilt kit and try it yourself. I have no experience diagnosing carburetor problems. But as Doc seems to have suggested, it might not have been done right the first time. But that doesn't mean the carb is a total loss. And if you do try it yourself, take pictures like I did. (See link in sig.) |
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| Author: | dakight [ Tue May 08, 2007 2:05 pm ] |
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At north of $3.00 a gallon you'll pay for whatever you put into the carb in pretty short order. Whatever you do though, don't go to a parts stroe and buy a reman carb. |
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| Author: | Aggressive Ted [ Tue May 08, 2007 2:25 pm ] |
| Post subject: | Rebuilt Holley 1920 |
Doc suggested that I switch from the Holley 1945 to a Holley 1920. I rebuilt a used 1920 and am now getting 22 miles per gallon with a #58 jet. That includes stop and go driving and freeway. Next step, I will try a #57 jet. With a #60 jet I was getting 20 miles per gallon. |
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| Author: | icaneat50eggs [ Tue May 08, 2007 2:38 pm ] |
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Also, your carb stream could be oldgoats spray, that may not be your problem. |
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| Author: | oldgoat83 [ Tue May 08, 2007 2:52 pm ] |
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Meehhehehehe |
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| Author: | icaneat50eggs [ Tue May 08, 2007 5:52 pm ] |
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That was left wide open, huh. 
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| Author: | Davey [ Tue May 08, 2007 6:05 pm ] |
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I'm no ace mechanic, but I have put rebuild kits in three carburetors in the last 4 years, and have had good success with all three. I did a pair of single throat rochesters on a corvair I was messing with, and I did the single throat carter (i think, may have been a roch) on a 66 cheby c10. All three ran great after I did them. Suggestions here are good ones...take pictures of anything you even THINK you won't remember like linkage routing etc. Take your time and be meticulous and methodical. If it is running about right before you do it, count the turns it takes to seat the idle air screws before you remove them, so you can put them back like they came out, at least as a starting point. If it runs before you start, and you put everything back like it was, at least it'll run when you finish...then you can tune it. Davey |
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| Author: | Rug_Trucker [ Tue May 08, 2007 6:31 pm ] |
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do these have power valves that are suseptable to backfire damage like the old Holley 4bbls were? 
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| Author: | DusterBuster [ Tue May 08, 2007 11:22 pm ] |
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well since the odds are in the favor of rebuild what kit is suggested for the best rebuild? |
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| Author: | Sam Powell [ Wed May 09, 2007 4:41 am ] |
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There are many issues in addition to your fuel that will effect fuel mileage. There are many good threads here that will show up with a search. But, my favorite, and typically ovelooked one is to check the ignition wiring from the battery, through the bulkhead connector, throught he instrument panel, ignitionswitch, and then back through the bulkhead connector to the ballast resister. Even if all your main ignition componenets are in great shape, if the wiring is bad, it wil not run right. That ignition wiring is full of old connectors that build up resistance that drops the voltage, and a Mopar Electronic ignitionwill not run well with less than top voltage. Just check the voltage at idle on the red wire from the alternator, and then check it on both sides of the ballast resistor. One side should be about the same as the alternator, while the other is the low side and will read about 8 V. If the high side drops more than .5 volts, you wil see an improvement in MPGs when you clean up the connectors. The easiest thing to do is replace them with new ones. That being said, it is probably a good thing to get your carb working right also. Back when my slant was a stock 2bl set up, I tried a STromberg 2bl from an old 318. It ran like a bat out of hell with this carb, but the fuel economy dropped from 22 to 15 MPG's so the fuel can definately effect this too. That is a handsome car. Keep it around for awhile. Sam |
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