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Re: Mixing premium with purple gas (110). Help me out here.
[Re: Dodgem]
#594808
01/27/10 01:30 PM
01/27/10 01:30 PM
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Joined: Mar 2003
Posts: 15,493
the boonies
aarcuda
I Live Here
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I Live Here
Joined: Mar 2003
Posts: 15,493
the boonies
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that cam will run about 6-8" vacuum at idle. and the so the 3.5 is about right. thats what i used to run when i ran it in my 340.
It's got a cop motor, a 440 cubic inch plant, it's got cop tires, cop suspensions, cop shocks. It's a model made before catalytic converters so it'll run good on regular gas.
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Re: Mixing premium with purple gas (110). Help me out here.
[Re: aarcuda]
#594809
01/27/10 01:33 PM
01/27/10 01:33 PM
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Joined: Mar 2003
Posts: 15,493
the boonies
aarcuda
I Live Here
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I Live Here
Joined: Mar 2003
Posts: 15,493
the boonies
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what distributor and ignition system are you running? i hadan old dual point distributor that would ping all the the time. went with an electronic and ecu and that cured a lot oof my trouble.
Also, could be the jetting is lean. I have always noticed the vacuum drops immediately to pretty much 0 when you step on it so the PV most likely is doing whats its supposed to.
If the timing is good, and no vac adv like you said, then the jetting is next
It's got a cop motor, a 440 cubic inch plant, it's got cop tires, cop suspensions, cop shocks. It's a model made before catalytic converters so it'll run good on regular gas.
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Re: Mixing premium with purple gas (110). Help me out here.
[Re: aarcuda]
#594811
01/28/10 11:46 PM
01/28/10 11:46 PM
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Joined: Mar 2003
Posts: 4,931
Tri-Cities, Washington
VITC_GTX
OP
master
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OP
master
Joined: Mar 2003
Posts: 4,931
Tri-Cities, Washington
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Quote:
what distributor and ignition system are you running? i hadan old dual point distributor that would ping all the the time. went with an electronic and ecu and that cured a lot oof my trouble.
Also, could be the jetting is lean. I have always noticed the vacuum drops immediately to pretty much 0 when you step on it so the PV most likely is doing whats its supposed to.
If the timing is good, and no vac adv like you said, then the jetting is next
I'm running a MP electronic distributor that has been recurved by FBO. Using the FBO coil and box as well.
Jets are 73/84 which I thought was quite a bit above stock.
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Re: Mixing premium with purple gas (110). Help me out here.
[Re: Dodgem]
#594812
01/28/10 11:49 PM
01/28/10 11:49 PM
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Joined: Mar 2003
Posts: 4,931
Tri-Cities, Washington
VITC_GTX
OP
master
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OP
master
Joined: Mar 2003
Posts: 4,931
Tri-Cities, Washington
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Quote:
In a big block I set the idle up to 900 or 1000 and run a 5.5 or even a 6.5 you only need 1.5 numbers under your in gear idle vacuum.
If it's pulling good vacuum on the highway and yo give it 1/3 throttle and it stays above 3.5 you enrichment circit does not work and it will be lean. likely the same problem off the line.
The car doesn't sound right at 1000 rpm idle. I like the low rumble of the 750-ish idle.
I thought the PV has to be about half of what the gear idle was, I can go as high as 1.5 below gear idle?
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Re: Mixing premium with purple gas (110). Help me out here.
[Re: RapidRobert]
#594815
01/29/10 09:08 AM
01/29/10 09:08 AM
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Joined: Feb 2003
Posts: 12,675
Columbia, CT
moper
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 12,675
Columbia, CT
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IMO, there's no way it should ping with that combo. Have you ever checked the timing curve that FBO gave you? Funny thing about pinging... Once it starts, it self propogates.. So you can't stop it unless you back off the throttle. So the trick is to not let it start. What gearing and convertor do you have in the car?
Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
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Re: Mixing premium with purple gas (110). Help me out here.
[Re: Dodgem]
#594818
01/29/10 11:19 AM
01/29/10 11:19 AM
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Joined: Mar 2003
Posts: 4,931
Tri-Cities, Washington
VITC_GTX
OP
master
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OP
master
Joined: Mar 2003
Posts: 4,931
Tri-Cities, Washington
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Quote:
Yea you can go 1.5 numbers below your IN GEAR idle vacuum. 1/2 is for real mild cams 16 to 20 in gear vacuum!
Try a 5.5 or 6.5 you will like it!
Yeah, from memory I have about 7-8 inches of vacuum.
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had same issue, stepped up power valve and problem gone. I also have very low vac. at idle around 5.0-5.5