Re: Car stinks at idle, too rich?
[Re: GTXX]
#1021613
06/27/11 11:54 PM
06/27/11 11:54 PM
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Joined: Jun 2003
Posts: 9,225 Charleston
sixpackgut
Drag Week Mod Champion
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Drag Week Mod Champion
Joined: Jun 2003
Posts: 9,225
Charleston
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make sure your throttle blades are set correctly then adjust your intial timing to suite your idle rpm needs
Gen 3 power 6.22@110, 9.85@135 Follow @g3hemiswap on instagram
performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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Re: Car stinks at idle, too rich?
[Re: LAR_414]
#1021619
06/29/11 12:36 PM
06/29/11 12:36 PM
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Joined: Jan 2003
Posts: 5,444 Indiana
YO7_A66
master
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master
Joined: Jan 2003
Posts: 5,444
Indiana
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Can a power valve "open" at idle? Yes, if the vacuum is below the PV rating.
Can it provide additional fuel at idle? No, as long as the motor is idling on the idle circuit. --------------------------------------------------------------------------------------------------------------------------
The power-valve circuit is completely separate from the idle circuit. If you have less vacuum at idle than your power valve is rated, then yes the power valve will open. BUT, the engine will not receive any additional fuel until the main circuit begins to flow fuel out of the boosters. If your engine is idling high enough that you are no longer on the idle circuit, and you still have less vacuum at this rpm than your power valve rating, then you may be feeding your engine with additional fuel thru the power valve.
1970 YO7 A66 [Canadian Export] F8 Challenger 340 (Currently in shop for stroker assy.)
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Re: Car stinks at idle, too rich?
[Re: LAR_414]
#1021621
06/29/11 12:53 PM
06/29/11 12:53 PM
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Joined: Jan 2003
Posts: 5,444 Indiana
YO7_A66
master
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master
Joined: Jan 2003
Posts: 5,444
Indiana
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Larry, I am agreeing with you. !!!!!!!!! My first two written lines just gives the facts for someone who is curious. My paragraph explains how bad it would have to be in order for it to happen.
1970 YO7 A66 [Canadian Export] F8 Challenger 340 (Currently in shop for stroker assy.)
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Re: Car stinks at idle, too rich?
[Re: LAR_414]
#1021623
06/29/11 01:03 PM
06/29/11 01:03 PM
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Joined: Aug 2003
Posts: 43,315 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,315
Bend,OR USA
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Quote:
I just don't like the idea of de-educating people by leading them on "theories" that are just that. In the real world, things happen different.
A lot of people keep saying that the PV is messing up your idle. STOP saying that!!!!! Let the Chevy guys tell eachother that! Educate our Mopar guys that this is completely the wrong way to look at an idle problem.
In "theory" it could affect it, but like I said, it would require so many factors and "out of tune" carb issues that you would never even entertain that "talk".
DUDE, you are so wrong on this Have you ever tuned a motor that had a big cam in it, 250 + degrees at .050 Or better yet how about one of the Mopar Purple shaft 284 cams in any motor Power valve opening affects the idle on a motor with a big cam that has less than 8 inches idling in gear at or below 1200 RPM Not trying to start a fight or disrespect you but when you make comments on here that can be misleading then someone needs to step up and set the record straight
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Car stinks at idle, too rich?
[Re: Cab_Burge]
#1021625
06/29/11 01:17 PM
06/29/11 01:17 PM
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Joined: Jun 2003
Posts: 9,225 Charleston
sixpackgut
Drag Week Mod Champion
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Drag Week Mod Champion
Joined: Jun 2003
Posts: 9,225
Charleston
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Quote:
Quote:
I just don't like the idea of de-educating people by leading them on "theories" that are just that. In the real world, things happen different.
A lot of people keep saying that the PV is messing up your idle. STOP saying that!!!!! Let the Chevy guys tell eachother that! Educate our Mopar guys that this is completely the wrong way to look at an idle problem.
In "theory" it could affect it, but like I said, it would require so many factors and "out of tune" carb issues that you would never even entertain that "talk".
DUDE, you are so wrong on this Have you ever tuned a motor that had a big cam in it, 250 + degrees at .050 Or better yet how about one of the Mopar Purple shaft 284 cams in any motor Power valve opening affects the idle on a motor with a big cam that has less than 8 inches idling in gear at or below 1200 RPM Not trying to start a fight or disrespect you but when you make comments on here that can be misleading then someone needs to step up and set the record straight
Cab, we could have argued about this last night when i was in the mood but you ignored it. now the post is deleted.
Gen 3 power 6.22@110, 9.85@135 Follow @g3hemiswap on instagram
performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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Re: Car stinks at idle, too rich?
[Re: LAR_414]
#1021626
06/29/11 02:17 PM
06/29/11 02:17 PM
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Joined: Jan 2003
Posts: 5,444 Indiana
YO7_A66
master
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master
Joined: Jan 2003
Posts: 5,444
Indiana
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""To have an engine actually IDLE with the Main Circuit on would require the blades to be open so far that the idle speed would probably be 3000rpm!"" I agree that on some model of carbs, the main circuit may not be activated until the 3000rpm level. Heck, mine does not activate until around the 3400rpms now that I have delayed it. But since this problem is all over the internet and some people are having this issue, maybe some carb brands or some carb models do have the main circuit starting in the lower rpm range that may be causing the pv to be activated at a higher than normal idle rpm. I am not trying to de-educate, I am only trying to point out that there might be a problem that some of us do not have to contend with (you and I for example) due to our existing parts. EDIT: This is interesting reading for everyone: http://www.innovatemotorsports.com/forums/showthread.php?t=17859 I am wrong, apparently it is not the main circuit that causes the issue. ""an open power valve at idle will cause the level of fuel in the main well to rise thus causing the IFR to flow more fuel.""
Last edited by YO7_A66; 06/29/11 06:29 PM.
1970 YO7 A66 [Canadian Export] F8 Challenger 340 (Currently in shop for stroker assy.)
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