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07-24-2007, 01:19 PM
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Super Moderator
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Join Date: May 2001
Location: Fresno,
CA
Cobra Make, Engine: KMP 184/482ci Shelby
Posts: 14,448
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Not Ranked
Rob...I'm running (and have been since new in 2003) a Holly 850DP on the 482.
No problemos whatsoever, street or track.
__________________
Jamo
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07-24-2007, 02:24 PM
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Banned
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Join Date: Jan 2003
Cobra Make, Engine:
Posts: 1,085
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Quote:
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Originally Posted by Jamo
Rob...I'm running (and have been since new in 2003) a Holly 850DP on the 482.
No problemos whatsoever, street or track.
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Can you cruise at 1500 RPM? |
07-24-2007, 02:38 PM
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Senior Club Cobra Member
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Join Date: Mar 2002
Location: God's country,
ME
Cobra Make, Engine: Original ERA 427sc, Powered by Gessford
Posts: 2,678
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Not Ranked
Rob-
The inability to cruise at 1500 rpm is more likely a function of your cam than your carb. I imagine your motor probably has a pretty big cam in it- in all likelihood it probably won't run smoothly until 2000 rpm or so regardless of what carb you have on the motor.
But that being said, a smaller carb will have better throttle response than a bigger carb. IMO, if you do a lot of street driving and are not worried about hp in the 6k rpm range, putting a 750 on is not a bad idea and will likely increase low rpm throttle response, but you will lost some top end hp. It is all a give and take.
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Replica is not a dirty word.
"If you can't be a good example, then you'll just have to be a horrible warning."
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07-24-2007, 03:15 PM
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CC Member
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Join Date: Sep 2006
Location: Tampa,
fl
Cobra Make, Engine: Kirkham #473 427 every option, Keithcraft aluminum FE 482 ci. Mass Flo FI. Tremec TKO 600.
Posts: 260
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Not Ranked
A sure fix
Put fuel injection on it and it will run like a top. 14-15 mpg and 900-1000 rpm idle. Never misses a beat.  |
07-24-2007, 03:39 PM
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CC Member
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Join Date: Dec 2001
Location: San Diego,
CA
Cobra Make, Engine:
Posts: 2,979
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If you are getting 14-15 mpg with that 482 FE you aren't sticking foot in it far enough.
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Remember, It's never too early to start beefing up your obituary.
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07-24-2007, 05:57 PM
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Super Moderator
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Join Date: May 2001
Location: Fresno,
CA
Cobra Make, Engine: KMP 184/482ci Shelby
Posts: 14,448
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Not Ranked
Quote:
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Originally Posted by rsimoes
Can you cruise at 1500 RPM?
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Barely...for the reasons Chappie states (da cam). Good throttle response though from about 18-19k, and no hiccups.
__________________
Jamo
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07-24-2007, 07:13 PM
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My throttle response is actually awesome. But, it's got lots of hick ups if just cruising below 2000, but at 2000 and up, smooth as glass. I guess it's the cam, but it does make 661 HP at 6000 and 670 ft-lbs at 4500, so I guess that's just what it is. And no, I don;t use the 661 HP, but I cruise a lot. hhhmmm. 
Okay, so the only problem really is that stall issue under g's. I will play with the float level some more and see if it has any affect. The idle dropped to 500 today, so I will bump it back to 1000 and go from there. 
Boy, I thought carbs were simple.  |
07-24-2007, 07:25 PM
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Super Moderator
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Join Date: May 2001
Location: Fresno,
CA
Cobra Make, Engine: KMP 184/482ci Shelby
Posts: 14,448
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Yup...I'd say you're ok given the big cam. Something else to consider...I'm running a WR toploader versus your five speed. Everything needs to work together...gearing, carb, cam, etc.
Center your efforts on the stalling. You've received good info/ideas from folks here. If I were you, take a carb guy out with you and try to recreate the stalling.
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Jamo
Last edited by Jamo; 07-24-2007 at 07:28 PM..
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07-24-2007, 10:16 PM
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CC Member
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Join Date: Dec 2001
Location: San Diego,
CA
Cobra Make, Engine:
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Quote:
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Originally Posted by rsimoes
The idle dropped to 500 today, so I will bump it back to 1000 and go from there. |
Did it do this on it's own?
That could be a clue.
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Remember, It's never too early to start beefing up your obituary.
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07-24-2007, 11:23 PM
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CC Member
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Join Date: Nov 2003
Location: Fresno,
CA
Cobra Make, Engine: Shelby CSX 4766 (Vegas Built) with 482 Aluminum Pond motor
Posts: 814
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Not Ranked
Yep!
Quote:
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Originally Posted by Chaplin
Rob-
The inability to cruise at 1500 rpm is more likely a function of your cam than your carb. I imagine your motor probably has a pretty big cam in it- in all likelihood it probably won't run smoothly until 2000 rpm or so regardless of what carb you have on the motor.
But that being said, a smaller carb will have better throttle response than a bigger carb. IMO, if you do a lot of street driving and are not worried about hp in the 6k rpm range, putting a 750 on is not a bad idea and will likely increase low rpm throttle response, but you will lost some top end hp. It is all a give and take.
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My motor now will idle no problem at 1000 rpm's and will not stall however it does not run smooth at under 2500 rpms. The reason is the cam. 630 lift.
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Morgan LeBlanc
Fresno CA
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07-25-2007, 04:39 AM
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Quote:
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Originally Posted by xlr8or
Did it do this on it's own?
That could be a clue.
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Yep, it did. .. |
07-25-2007, 05:24 AM
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CC Member
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Join Date: Feb 2007
Location: Raytown,
mo
Cobra Make, Engine: FFR Coupe SOLD.Current 66 Mustang
Posts: 962
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do you have any room to ad an extention to your float overflow tube on your carb we did it to check fuel slosh,we race d on a highly banked track30degrees+100+mph and that pesky fuel was coming out and going back down the carb we lowerd our fuel below the glass and that fixed it. of corse it was just barely below but it made a diff.good luckWB
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07-25-2007, 09:04 AM
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An inconsistant idle could be many things. I was having that problem and it turned out to be the distributor. The mechanical advance wasn't returning all the way on an intermittent basis so it would idle high until it sat for a bit then would start dropping as the timing returned to normal. Might want to check the timing on the car before and after going for a run as well as watching the advance with the timing light to see if it resets as the RPM drops. Might want to pull the cap and rotor to check the springs on the advance.
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Remember, It's never too early to start beefing up your obituary.
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07-25-2007, 03:08 PM
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Senior Club Cobra Member
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Join Date: Jan 2005
Location: VALLEY FORGE,
PA
Cobra Make, Engine: SUPERFORMANCE w DOUG MEYER ENGINE
Posts: 1,958
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What do the plugs look like?
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07-25-2007, 05:53 PM
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Banned
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Since this is way more stuff than I know, I made an appointment with a local shop that will dyno tune the car this Friday. I'll let you know how it turns out.
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07-25-2007, 06:10 PM
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Senior Club Cobra Member
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Join Date: Mar 2002
Location: God's country,
ME
Cobra Make, Engine: Original ERA 427sc, Powered by Gessford
Posts: 2,678
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Rob-
Just as an fyi. Unless they install the jet extensions and/or vent whistles on the carb, the dyno tune session will not cure your stalling problem on hard braking.
__________________
Replica is not a dirty word.
"If you can't be a good example, then you'll just have to be a horrible warning."
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07-25-2007, 06:16 PM
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CC Member
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Join Date: Jul 2005
Location: Bartlett,
Ill
Cobra Make, Engine: Everett-Morrison LS1
Posts: 2,448
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You have a drivability problem--it will not be solved on the dyno--they will run it stationary from 4500-6500 rpm---you need to drive it from an idle to 2500
Jerry
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07-25-2007, 07:08 PM
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Banned
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I told the guy that the last thing I want is more power. I told him that I want drivability from idle to 4500 RPM and that the stalling needs to be addressed first. I think I have two separate issues. We'll see what happens. I apreciate all of the feedback.
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07-25-2007, 09:49 PM
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Super Moderator
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Join Date: May 2001
Location: Fresno,
CA
Cobra Make, Engine: KMP 184/482ci Shelby
Posts: 14,448
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Not Ranked
Rob...just remember: Whatever is broke can be fixed on these things.
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Jamo
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07-26-2007, 05:43 AM
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CC Member
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Join Date: Feb 2007
Location: Raytown,
mo
Cobra Make, Engine: FFR Coupe SOLD.Current 66 Mustang
Posts: 962
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ya no we had those floats with that were special made with the corners cut off, now they are very common ther black not metel, so when the fuel moves to the left or right it doesnt raise the level anyone else ever usedm??
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