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Post by reddust on Apr 22, 2007 20:54:28 GMT -5
i have a fluttering or skip in my motor and i cant find why. we set the timing and bought brand new plugs. the wires dont look bad. there is no heat damage or cuts on them. the skip doesnt happen until i get into higher rpm ranges. does anyone know what is causing this?
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Post by rpm/mullis on Apr 22, 2007 21:20:58 GMT -5
[glow=blue,5,500] I had two problems like this last season. The first time was a bad coil, the second time a fitting on the fuel cell came loose. [/glow]
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Post by reddust on Apr 22, 2007 21:23:57 GMT -5
now the motor sounds really strong idleing. just when it goes to higher rpms. how do check the coil? i dont know much about engines at all. any advice will help
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Post by DOCTOR FIELDS on Apr 23, 2007 9:15:13 GMT -5
What type of coil are you running? Stock or aftermarket? I had an MSD Blaster coil starting jumping fire from the coil wire to the + - terminals. Took us awhile to figure out what was causing the miss.
Your problem could also be in the distributor, do you have a spare you could bolt in?
Don't count out the carburetor and fuel system either. Are you running too lean / too rich? What type of fuel line do you have, is it possible the fuel line is kinked and collapsing under high pressure?
Just some options to check. Let us know what you find out.
Stephen Fields
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Post by reddust on Apr 23, 2007 16:37:03 GMT -5
i am running a msd coil. how do i tell if it is jumping terminals? i dont think i have a spare distributor. i have to go back to the shop and check. i was told not to mess with the carb because it was set perfect to the motor. i am running a 72-74 jet on a holley 500. i havent even check anything with the fuel line. i am goin to go check out all this stuff tomorrow and see what comes of the whole situation. you guys are a ton of help even if youre not right. i havent even thought of any of these potential problems. thanks guys
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Post by rad15E on Apr 23, 2007 19:49:23 GMT -5
hey reddust,i would check everything fields was talking about,but one other thing if your distributor has not had the advance blocked it may be changing the timing to much,one other thing i also run a 500 holley and the jets you were talking about are way to big for mine,check the color on you plugs good luck hope this helps
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Post by reddust on Apr 23, 2007 19:52:51 GMT -5
what color should the plugs be? i took the car out for practice and the timing was off a little and it filed the plugs. i put new plugs in. the color doesnt look abnormal. what do you mean the distributor having the advanced blocked? how do i fix this. im new and know nothing about motors. yall are goin to have to dumb this down for me
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Post by thebest on Apr 24, 2007 23:06:21 GMT -5
Take the vacuume line off the distributor. go down 2 jet size's in the carb. take the distributor springs off the centrificall weights, weld it in place. set the timming 36 degrees should take care of the problem. spark plugs should be light brown, darker means richer = slower, white is lean , lean is mean = faster . i run mine all most white more like yellow. too lite could burn a piston. Keep a good eye on the plugs they will tell you a lot.
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Post by DOCTOR FIELDS on Apr 25, 2007 7:27:21 GMT -5
I don't know about 36 degrees.. That seems a little too high. About the only "true" way of setting the timing is experimenting on a chassis dyno, but not everyone has that kind of money or time. If you're running a stock rod engine you'll want to set it at around 32 - 34 degrees, personally i wouldn't go any higher. If you have a long rod engine, you'll want to set it just a tad lower at 30 - 32 degrees.
Plugs should be light brown like (thebest) said, if they're black you're too rich, white too lean.
Start by checking your spark plugs and go from there. Don't change alot at once because you won't know what fixed it if you change everything mentioned.
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Post by thebest on Apr 25, 2007 19:14:36 GMT -5
36 degrees is where i have my long rod kit set at, but i turn a lot of rpms, every motor is not the same some likes timming some don't. You have keep a close i on the plugs they will tell you if your timming is too high or not enough or too lean or too rich Just as feilds has said watch the plugs.
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Post by reddust on Apr 26, 2007 17:04:13 GMT -5
my plugs are kind of dark. what do i need to do? explain it please cause im kind of new to working on motors
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Post by rad15E on Apr 26, 2007 20:15:41 GMT -5
reddust you need to check the plugs after a couple of laps on the track to get a good reading,if you check them after its been idleing for a while you won't get a true reading ,if they are still dark have at good carb guy to check the jets so you'll no where to start
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Post by thebest on Apr 26, 2007 21:37:46 GMT -5
If you can get your car up to as close as you can to operating speed or as close as possible and push the clutch in and shut the car off and coast to where you can check your plugs not just one, pull them all if they are still as dark as when you started out then go down 2 jet sizes being smaller numbers,and keep getting smaller until you get them as close too hey or straw yellow as possible. light brown if you get nerve's. How to change the jets take the four screws out or 5/16 ths bolts out and take the bowl off you will see two small screw type brass looking with numbers on them these are the jets. Hope this helps.
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Post by reddust on May 25, 2007 13:43:04 GMT -5
right now i have dropped to a 70 jet. plugs are still dark. i guess i need to keep going down. thanks everyone for their input. i am having a blast racing. i dont care if i finish up front or not. this is awesome.
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