|05-27-2013 07:03 PM|
Stpd Carb, stupid tuner.....(me)
650 works fine....no smoke, pulls hard....
For now the 750 sits.....will worry about another time.
Thanks again F-Bird....appreciate the help.
|05-26-2013 09:41 PM|
Transfer slots squared
Now sitting on my shelf....
Got pssd off and threw on my 650DP and will see how that works in the morning on my way to work.
idle is much snappier, mixture screws 1.5 turns out.
Haven't driven it till the morn.
If it isn't any better then I will have to go deeper I guess.
Thanks for the help with it and I will report back tommorow.
|05-26-2013 05:21 PM|
I give up.....runs perfect, it could pass for fuel injection at this point, its snappy everywhere, no bogs or stumbles and pulls clean from every rpm......
Smokes and smells....behind me, cruising speed, its clean....but idling in the lane way, smokes, accelerating, smokes....def dark, def fuel....
|05-26-2013 01:20 PM|
OK, got a new vacuum guage, reset transfer slots front and rear, started over with mixture screws,
Vacuum is 18 in park, 15 in gear, mixture screws are very sensitive to tiny changes, they are both a little over 1.5 turns out.
Idle seems stable and has snappy response. Still very smelly exhaust, no smoke at idle now.
Going to go drive it now and see what i have.
Fine, I concede, I will pick up tune up parts this week lol....see if it helps.
|05-25-2013 09:39 PM|
No, Carb isn't flooding at all, it starts, it shuts off, it doesn't diesel or do anything unusual. Throttle response is now good across the board with no more stumbles or bogs.
Other then once the floats were set right I then had a lower idle.
This will allow me to open the secomdaries up and get front to back even.
Yes, the ignition is new, but its not "brand new" it was on the car last season with no issues. This is only become an issue since I switched over to the Holley.
I'm going to rest the transfer slots tommorow and see what changes. I didn't realize that having the rear closed and front open too far could cause any drivabilty concerns other then at idle.
The baseplate and metering blocks are over 20years old....not much drive time on anything but still old.....so maybe there's more to it then anything I'm doing or not doing.
Will try in the am and see if it helps.
|05-25-2013 07:55 PM|
Slight wake up call here, remember when I had said it idled to high with the rear transfer slots exposed? Well with the floats set right that isn't the case, I can idle it down to a stall using the idle screw. So currently I have the rear slots closed but now I can actually open them up and get front and rear squared.
Will improper transfer slot exposure effect idle rich condition?
Will improper transfer slots effect things anywhere else? Just wanted to know if this could be my cause of my rich everywhere condition.
|05-25-2013 04:29 PM|
Will drill 2 blanks to 0.062 and replace the 75's with them and go from there.
Ignition is stock HEI, but directly from GM...and has less then 2000k on it.
So I'm not sure what ignition issue I would have that is causing a rich condition?
I may still have an old msd 6A kicking around....if so is it worth installing on such a mild motor?
|05-25-2013 02:19 PM|
70 idle, 31 main on the primary,
28 idle and 25 main in the secondary.
But these bleed sizes will be richer across the board compared to what I'm currently running.
Right now I'm 75 idle, 36 main and
36 idle and main on the secondary
Bigger is leaner correct?
I was shocked to see the difference float level made.
I was going to start with opening up the fronts to 80 and 40
Secondaries to 42 on both primary and secondary
This should lean it out a bit for idle and high speed bleeds.
I have read to try and get it to a point where it has a lean surge while cruising, then go back a bit in bleed size.
What do you think?
Or should I try and take some jet out of it first? With the floats wrong I wasnt getting an accurate test before so I could go back and try 68/76 again and see how it feels and how the plugs look.
|05-25-2013 01:10 PM|
OK, so small update. Switched the secondary iab's to 36's. So front are 75 for the high speeds and 36 for the idle, rears are all 36. That didn't change much, this morning set the floats again, and I guess I wasn't setting them with it warmed up enough. Once up to temp the rear would be more then a trickle out of the sights. So I lowered it a bunch, now giving the car a good nudge some will dribble out. This has cured a few things.
1: it no longer bogs anywhere, even cruising in OD at 1600rpm it will pull clean.
2: it no longer stumbles when turning and accelerating.
3: it doesn't stall when i pound on the brakes.
4: when it got hot, it would idle high, 1100 in park, 800 in gear. Now it was too low, but no longer effected by temp. In had to increase it to get back to 900 in park, 600rpm in gear. Much more stable as well.
Still chasing a very rich condition. Driving around town and any moderate and up throtlle input brings black smoke from the exhaust.
Only once, but it was weird, it would want to just shut off. Pulling to light, it would just want to shut off. Had to 2 foot it to keep it running. The fuel level was very low, less then an 8th of a tank, so maybe it suffers a pressure drop at that point? I got gas and it didn't do it again.....yet.
And all in all it actually feels stronger, which I have no idea why an improper float level would effect, but it does....with 327 gears and an OD it an absolute animal on the highway....I have buried the speedo in a heartbeat out on the country highway where I live....and it still keeps pulling. Kinda neat
The stock 750 bleeds were actually richer based on size then the current ones. So I have 10 blanks now, I'm going to use what I'm running as a starting point and start opening them up a bit at a time and see if I can eliminate the smoke and rich condition. Im not sure if i should open the high speeds up, or just the idle bleeds. Or all of them in small steps. Indomt believe its a jet issue, I'm running 70/80's in it now and any less in the primary and it develops a lean surge condition.
So that's my novel, I'm sure nobody has time to read it all and add input....but I need to write stuff down to get a grasp of things so this is my way to do that.
|05-20-2013 12:02 PM|
The proform body comes with,and I bought for the Holley, an extra set of 36's for the secondary outers when used with 2 corner idle like mine. I was concerned that these would richen the idle up way too much and never actually drove it I don't think when i had them in there. I just stayed with the 75 outers on the primary and secondary, and 36's on the inners. It takes about three seconds to swap them over tho so maybe I will try that this afternoon. My blanks are at work and were closed today so can't do much else for now.
|05-20-2013 10:00 AM|
|05-17-2013 10:43 PM|
|bygddy||70/78 seems to show the best results with the plugs, and no more black smoke when I jump on it. It does now have a tip in stumble, almost like a lean bog for a second....may try changing the pump cam to #2 position and see how it works.|
|05-17-2013 05:28 PM|
|bygddy||Oh and vacuum is rock steady at 20 in park, 15 in hear. Does not move at all. Mixture screws are very responsive. 1 and 1/4 out on each side.|
|05-17-2013 05:27 PM|
|05-17-2013 10:31 AM|
|ap72||a wideband won't help you at all on your idle. In fact it can make things worse as they do NOT give an accurate reading at idle, use your vacuum gauge.|
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