carb tuning info and links



Re: carb tuning info and links

Postby elisalvador » July 18th, 2014, 8:57 am

thanks grumpy ill read through links and ill test the power valve tonight
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Re: carb tuning info and links

Postby elisalvador » July 21st, 2014, 11:29 pm

ok I closed the idle screws while engine was running and car died.so that means power valve is not leaking?. carb came with .072 jets,,, I switched them to .069 engine idled better, vac gauge read 20 in vac and it was steady , if I snap the throttle I can hear the carb choking leaning out and once in a while it will sneeze through the carb only when I snapp the throttle but if I slowly open the throttle it will not sneeze nor tumble. I need to buy new plugs to see whats going on with the new jets sizes, but this has made me stumble... I have spark and timing is dead on. I am using a vac advance and its at 12 deg at idle .thanks grumpy any help would be appreciated
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Re: carb tuning info and links

Postby grumpyvette » July 22nd, 2014, 8:38 am

elisalvador wrote:ok I closed the idle screws while engine was running and car died.so that means power valve is not leaking?.
NO! THAT IS A TOTALLY DIFFERENT CIRCUIT

carb came with .072 jets,,, I switched them to .069 engine idled better, vac gauge read 20 in vac and it was steady , if I snap the throttle I can hear the carb choking leaning out and once in a while it will sneeze through the carb only when I snapp the throttle but if I slowly open the throttle it will not sneeze nor tumble. I need to buy new plugs to see whats going on with the new jets sizes, but this has made me stumble... I have spark and timing is dead on. I am using a vac advance and its at 12 deg at idle .thanks grumpy any help would be appreciated


that sounds suspiciously like the. power valves diaphragm is leaking, or the accelerator pump cam, is wrong, for the application, or the accelerator pumps not working correctly, or the squirters are plugged, in any case the symptoms point to the most likely cause is the float levels may be set higher than ideal, and the power valve needs to be replaced with a 9.5, as its probably leaking fuel at idle but not kicking in fuel correctly when the vacuum falls
GRUMPY??? Are there any differences between the Holley 4150 and 4160 series carbs?


here they explain it well
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https://www.youtube.com/watch?v=ILhfE3yC5Vo
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4150
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4160
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https://www.youtube.com/watch?v=OlzzGDdbKUc

https://www.youtube.com/watch?v=inuxfloUT8k

https://www.youtube.com/watch?v=cwa_DylnJVg

https://www.youtube.com/watch?v=HtsfgxnyN6o

https://www.youtube.com/watch?v=L39HI8qW59E

https://www.youtube.com/watch?v=P7GX82ljmxg


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http://www.amazon.com/Holley-Carburetor ... lley+carbs
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read these carefully

viewtopic.php?f=55&t=1790

viewtopic.php?f=55&t=1639

viewtopic.php?f=55&t=1115
IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!
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Re: carb tuning info and links

Postby elisalvador » July 22nd, 2014, 9:32 pm

alright I found out what was wrong with the engine. I bought new plugs new power valve, swapped out the power valve and replaced the plugs, started engine and it was running perfect, but it was doing the same thing it would sneeze and back fire and partial throttle. so I had another carb laying around swapped the carb with a 650 cfm and with .064 jets, tuned it installed and it ran a little better... it will sneeze a little almost nothing I forgot to attach the down shift linkage for the trans , I revved the engine and it got stuck on the linkage so engine was stuck at 3500 rpm :o ,,for at least 3 seconds, I hurried up and shut the engine off, I adjusted the linkage,, went to restart the engine and I hear a very loud shotgun noise and engine never started.. I look under the vehicle and I find both mufflers are literally blown ,,, now this mufflers are the stock ones, so I restarted the engine , and I no longer had any problems engine revved up good no hesitation no stumble, good vacuum and good power and this time engine did not die when in gear,,, so im concluded the mufflers were 80% or more clogged until they couldn't handle It and exploded that my friend was pretty funny ,,, and yet nerve wrecking ,,, but thanks grumpy for helping me out hope u enjoyed the repair :D
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Re: carb tuning info and links

Postby Indycars » July 23rd, 2014, 7:55 am

elisalvador wrote: went to restart the engine and I hear a very loud shotgun noise and engine never started.. I look under the vehicle and I find both mufflers are literally blown ,,, now this mufflers are the stock ones, so I restarted the engine , and I no longer had any problems engine revved up good no hesitation no stumble, good vacuum and good power and this time engine did not die when in gear,,, so im concluded the mufflers were 80% or more clogged until they couldn't handle It and exploded that my friend was pretty funny ,,, and yet nerve wrecking ,,, but thanks grumpy for helping me out hope u enjoyed the repair :D


I guess it's true what they say ..... if you can't get it out (exhaust), you can't get it in (fuel & air) !

I image your face might have looked like this when it exploded!

Image


Rick
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Re: carb tuning info and links

Postby elisalvador » July 23rd, 2014, 9:26 pm

that's about right :lol:
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Re: carb tuning info and links

Postby elisalvador » October 7th, 2014, 9:12 am

hi guys,,, I figured ill give you guys another update, after installing new mufflers, car ran great, for about 30 mins, then there was a loud tick noise, coming from drivers side, removed the valve cover and seen a loose rocker arm , this has poly locks, theres no way it could've got loose, so I tightened it back up , test drove now car ran bad , the noise came back removed cover and rocker was loose again , it turned out the cam lobe was wearing down,,, and causing all these headaches ,,, so now back to a rebuild ,
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Re: carb tuning info and links

Postby grumpyvette » October 7th, 2014, 9:19 am

yeah! I hate it when you think you see the day light at the end of the tunnel,
only to find its an oncoming train about to run over you ,with new problems,
but unfortunately its far to common working on older cars
IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!
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