|
Re: ideling in ear problem
[Re: mopfried]
#982300
04/28/11 10:59 PM
04/28/11 10:59 PM
|
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
dartman366
I Live Here
|
I Live Here
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
|
couple of thing's,,initial timing, are you using a mechanical advance or just not using the vac diaphragm, also if that all check's out then you might want to switch to a smaller air bleed in the idle circuit to richen it up a little. 
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
|
|
|
Re: ideling in ear problem
[Re: mopfried]
#982302
04/28/11 11:52 PM
04/28/11 11:52 PM
|
Joined: Jul 2008
Posts: 394
md
wicked
enthusiast
|
enthusiast
Joined: Jul 2008
Posts: 394
md
|
I think you hit it when you said converter is tight.
Last edited by wicked; 04/28/11 11:59 PM.
|
|
|
Re: ideling in ear problem
[Re: Dunnuck Racing]
#982305
04/29/11 09:37 AM
04/29/11 09:37 AM
|
Joined: Apr 2005
Posts: 1,322
Michigan
crlush
pro stock
|
pro stock
Joined: Apr 2005
Posts: 1,322
Michigan
|
Quote:
Sounds like you may need more initial timing.Try putting a couple more degrees in it and see if it improves,if so you might need to limit the mechanical advance and crank up the initial timing. 
Keith
 what he said
|
|
|
Re: idleing in gear problem
[Re: mopfried]
#982306
04/29/11 09:44 AM
04/29/11 09:44 AM
|
Joined: Jul 2007
Posts: 531
Virginia
JimG
mopar
|
mopar
Joined: Jul 2007
Posts: 531
Virginia
|
Quote:
If I raise the float level really high (did by mistake) it seems to help.
Besides what's already been suggested, check the relationship between the throttle plates and the transition slot at idle. The fact that raising the float level improved the situation leads me there.
No more than a "square" of t-slot should be exposed at idle. Much more, and you run the risk of partially idling on the main circuit, which is far more sensitive to float level.
As previously stated, ithe IABs are on the outside. If that 750 doesn't have screw-in air bleeds, you can partially block them with a small piece of wire, just for a test. Check the blade/t-slot relationship before you do that, though. And if you're still thinking you need more initial timing, do that before you do anything to the carb.
|
|
|
Re: idleing in gear problem
[Re: mopfried]
#982308
04/29/11 10:14 AM
04/29/11 10:14 AM
|
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
joedust451
super gas
|
super gas
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
|
Quote:
Thanks. I will bump the timing and if that dont do it I will check the slots. I dont think the cam is big enought to need a looser convertor.
Yes your right, that cam is mild & should be fine with a 2-2200 stall, Play with the timing 1st., make sure all the ignition is in good shape too, & check for any vacuum leaks.
|
|
|
Re: ideling in gear problem
[Re: mopfried]
#982315
05/02/11 11:44 PM
05/02/11 11:44 PM
|
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
joedust451
super gas
|
super gas
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
|
Quote:
I have advanced the timing all over the place, retuned the carb idle screws and idle speed. I think its too rich. it seemed better when the engine was cool. I can plug one of the primary idle bleeds an it slowes down, plug both of the and it almost dies. As far as the transfer slots go I had the timing up high enough the idle screw was barely turned. i backed off the secondary idke screw until it was shut.... nothing seems to help. The converter is tight.
idle at 1000 1100 and it drops into gear hard.
Make sure the IABs are not stopped up, spray all 8 with carb cleaner, check the plugs & make sure they are not foiled at this point, i'll bet they are, You will play "hell" trying to get it tuned if they are  , install a fresh set, then play with the timing, I still say that cam is mild, tuned in, it should hold around 12 in. of vacuum, we ran one in a mild 360 with a stock type converter & 3.91 gears, the RPM would only drop around 300, the torque was outstanding & it was a tire fryer, If all else fails, you may need to open up the primary IABs around .003", if you need any more help, feel free to PM me. 
|
|
|
Re: ideling in gear problem
[Re: mopfried]
#982317
05/04/11 10:04 AM
05/04/11 10:04 AM
|
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
joedust451
super gas
|
super gas
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
|
Quote:
I tried cleaning the idle bleeds and no help so I pulled the carb and checked the idle slots. They looked OK. I found the secondary shaft pretty loose. Probably enought to cause a vacuum leak. I had checked that with carb cleaner but it didnt show bad. My thought was to compare idle passages in the meteing block to another. Since the shaft was so loose I just put the BG 850 DP back on. It dosent seem to run as rich but still stalls when I drop it in gear... I have a Mallory unilite dist.... I put it in and guess what, the stalling quit? I dont understand. I know the total timing is way high. I will fix that tonight. Thank God for start retard!
Sounds like your just having a timing problem, you don't have enough int. timing, Is that Mallory adj., if so, i'd be setting it up around 16* int., 36* total all in around 24-2600. Once you get the bugs worked out you'll see i'm right about that cam, it will idle with a very mild converter.
|
|
|
Re: ideling in gear problem
[Re: joedust451]
#982318
05/04/11 10:18 AM
05/04/11 10:18 AM
|
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
Too Many Posts
|
Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
|
Quote:
Quote:
I tried cleaning the idle bleeds and no help so I pulled the carb and checked the idle slots. They looked OK. I found the secondary shaft pretty loose. Probably enought to cause a vacuum leak. I had checked that with carb cleaner but it didnt show bad. My thought was to compare idle passages in the meteing block to another. Since the shaft was so loose I just put the BG 850 DP back on. It dosent seem to run as rich but still stalls when I drop it in gear... I have a Mallory unilite dist.... I put it in and guess what, the stalling quit? I dont understand. I know the total timing is way high. I will fix that tonight. Thank God for start retard!
Sounds like your just having a timing problem, you don't have enough int. timing, Is that Mallory adj., if so, i'd be setting it up around 16* int., 36* total all in around 24-2600. Once you get the bugs worked out you'll see i'm right about that cam, it will idle with a very mild converter.
Convertor is fine, you need to understand what intial timing is and total timing. It needs more intial and then you have to limit total timing. That will fix it for sure. Basic tuning.
|
|
|
Re: ideling in ear problem
[Re: Dunnuck Racing]
#982319
05/04/11 10:18 AM
05/04/11 10:18 AM
|
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
Too Many Posts
|
Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
|
Quote:
Sounds like you may need more initial timing.Try putting a couple more degrees in it and see if it improves,if so you might need to limit the mechanical advance and crank up the initial timing.
Keith
|
|
|
Re: ideling in ear problem
[Re: Challenger 1]
#982320
05/05/11 10:06 PM
05/05/11 10:06 PM
|
Joined: Jan 2006
Posts: 587
IL . usa
cjs69mope
mopar
|
mopar
Joined: Jan 2006
Posts: 587
IL . usa
|
BG Demon carbs are designed to work with at least 20 deg of initial timing . just keep that in mind if you tune by what people tell you to set the timing at you will never figure it out yourself .
just turn the timing up until you get the best vacuum .
that is where i would leave the initial and adjust the advance from there to limit timing .every motor is differant.
Keith black has done tests and found that very little hp was recognized when advancing past 34 total timing .
with pump premium 93 36 38 could be risky . on a iron head motor .
1969 Dodge Charger
1969 Dodge Superbee
|
|
|
|
|
