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  #16 (permalink)  
Old 12-13-2012, 05:57 PM
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Quote:
Originally Posted by stroker385 View Post
thanks for the input on the harmonic balancer , i will definately try that.the timing cover has the tube like thing for timing at 12:00 but it also has a dial on right side 2:00 and none hit at all,so ty i appreciate the tip.i will do that im a back yard mechanic and i mean back yard its cold out there .i did adjust the air on metering blocks ,i turned them out another 1/4 each and the engin picked up and smoothened out .im about to road test and see what happens. i also pulled the vac adv from dist and plugged it and then shifted it and same thing ,hard shift,could this converter be locked up? it is 7 yrs old
Don't be afraid to turn the idle mixture screws more than 1/2 turn- give them what ever turns they need to get the idle speed as high as you can get it- this is the best setting.

This is usually done by counting the turns until the screws are lightly seated then turn them both back out the same amount, judging by how many turns it took to lightly seat them. Then adjust from there.

Lower the idle speed if needed by using the regular curb idle speed screw as you adjust the mixture screws. Both idle mixture screws should be within 1/2 turn of each other when you're done.

If you have a vacuum gauge you can use that to adjust the mixture screws. Set them to give the most vacuum at idle. There should be more info and videos, etc. on this out there.

If the tranny is shifting at a too-high rpm and is shifting harsh or banging the gears, the vacuum modulator could be bad, or the line to it leaking. The detent cable may be out of adjustment if it's hooked up. Or you may have a shift kit/valve body mods that are causing too-firm shifts. It's not the TC being locked, though.

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  #17 (permalink)  
Old 12-13-2012, 07:04 PM
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the intake is a performer ,edelbrock and the pcv is run from front of carb to drivers side valve cover this has oval track valve covers so they have the 3 inch tubes for the breathers,so im running 1 breather and the pcv is in the other .
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  #18 (permalink)  
Old 12-13-2012, 07:18 PM
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right now the air mixture screws on the carb are both 2 full turns out im not sure what stock setting is ,there is no metering block on the rear ,just the front
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  #19 (permalink)  
Old 12-13-2012, 07:48 PM
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i am also told this cam wont come in till 3500 rpms
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  #20 (permalink)  
Old 12-13-2012, 08:11 PM
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who told you the cam wont come on until 3,500 RPM? and how did they decide that?

most medium cams are equal to stock cams at the low range and make more power on top
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  #21 (permalink)  
Old 12-13-2012, 09:05 PM
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Quote:
Originally Posted by stroker385 View Post
right now the air mixture screws on the carb are both 2 full turns out im not sure what stock setting is ,there is no metering block on the rear ,just the front
There is no stock setting there is a beginning setting so the vehicle will start and run and then you adjust from there to get your best idle and vacuum signal like Cobalt told you!

Jester
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  #22 (permalink)  
Old 12-13-2012, 09:32 PM
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i am also told this cam wont come in till 3500 rpms
Positive-displacement or "Roots-type" superchargers tend to produce massive power at low rpm and taper off higher in the rpm range; from Idle to about 5500 Rpm on a low boost engine which is usually on the street or a weekend warrior!

You converter and cam don't come in till late and are wasting all your torque your putting out at your lower RPMs with a roots supercharger. Right off idle an engine with a Roots supercharger will typically have nearly full boost and massive power. This power increase will be fairly constant throughout the RPM range. Till it reaches an rpm point that the supercharger begins to lose efficiency!

Turbos are the other way around! low boost at idle and as rpm comes up boost increases to high rpm so you need high stall speeds and cam's that come in late!

jester

Last edited by painted jester; 12-13-2012 at 09:41 PM.
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  #23 (permalink)  
Old 12-14-2012, 05:35 AM
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to answer vinnies question ,i was told that the cam thats in this motor starts building power at 3500 rpms .it wont turn tires out of the gate very well but when she comes out of first into second she will break those 35's loose. it has a real lumpy idle,probably doesnt answer your question .but im sure you know a whole lot more about these things than i do .i really appreciate all you guys help.im gaining ground ,and am very greatful for all your responses , im gonna take another crack at the idle mixture screws today
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  #24 (permalink)  
Old 12-14-2012, 09:08 AM
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When you adjust the mixture screws be sure the engine is fully warmed up. If you adjust them with the engine colder than normal, the idle mixture will be too rich once it warms up all the way.
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  #25 (permalink)  
Old 12-16-2012, 08:18 AM
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i pulled old distributor and replaced it with a used 1 and now my shift issue has gone ,i dont know what that would of had to do with it if any at all.im gonna go back to the idle mixture screws and start again
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  #26 (permalink)  
Old 12-16-2012, 11:33 AM
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Originally Posted by stroker385 View Post
i have a 305 that a guy built for a street stock and the only thing i did to it was put new valve seats and springs and retainers on it .it has a 460 lift solid lifter cam ,not sure about duration and ,im having trouble with popping out carb around 3000 rpms, i had the valve covers off and checked rockers ,i adjusted intake to .018 and the exhaust at .020 and still have popping ,sounds like she is running on about 6 cyls just before it gets to 300 she wants to go,and then it breaks down .it has a new holley 600 on it and was running great. i got a 305 harmonic balancer for it and when i tried to time it ,the marks are no where even close.any help would be nice ,ty ,bud
While you had the valve covers off, did you check the amount of travel on the valves?
A bad cam lobe will cause exactly what you describe.
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  #27 (permalink)  
Old 12-17-2012, 06:57 AM
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i didnt check them ,i really hate this solid lifter cam anyways but im not that knowledgable as to what to replace it with, i like the rough idle and the power this truck has when running right,my stroker ,they put a rv cam in it for low end tork when i was mud racing it and it didnt have the rough idlle,now its just a street truck
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  #28 (permalink)  
Old 12-17-2012, 12:23 PM
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Quote:
Originally Posted by painted jester View Post
Positive-displacement or "Roots-type" superchargers tend to produce massive power at low rpm and taper off higher in the rpm range; from Idle to about 5500 Rpm on a low boost engine which is usually on the street or a weekend warrior!

You converter and cam don't come in till late and are wasting all your torque your putting out at your lower RPMs with a roots supercharger. Right off idle an engine with a Roots supercharger will typically have nearly full boost and massive power. This power increase will be fairly constant throughout the RPM range. Till it reaches an rpm point that the supercharger begins to lose efficiency!

Turbos are the other way around! low boost at idle and as rpm comes up boost increases to high rpm so you need high stall speeds and cam's that come in late!

jester

I don't know how !!!!! But I posted this on the wrong thread LOL

Sorry Jester
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  #29 (permalink)  
Old 12-17-2012, 01:40 PM
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im glad cause i was confused ,lol
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  #30 (permalink)  
Old 12-17-2012, 04:11 PM
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im glad cause i was confused ,lol
LOLJester
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