Re: Sluggish 440 w/509 MP cam.
[Re: dulcich]
#475503
09/21/09 05:17 PM
09/21/09 05:17 PM
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Joined: Jan 2003
Posts: 2,165 Inver Grove Heights MN
74RR
OP
top fuel
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OP
top fuel
Joined: Jan 2003
Posts: 2,165
Inver Grove Heights MN
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Quote:
Generally, yes it will be much more responsive with a DP. You want to run some converter with that cam too, and headers and gear. -dulcich
Convertor is a Dynamic 10" Headers are Hedman cheapies and gearing is 3:91. Thanks.
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Re: Sluggish 440 w/509 MP cam.
[Re: 74RR]
#475508
09/21/09 06:20 PM
09/21/09 06:20 PM
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Joined: Jan 2003
Posts: 931
dulcich
super stock
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super stock
Joined: Jan 2003
Posts: 931
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Quote:
Quote:
Generally, yes it will be much more responsive with a DP. You want to run some converter with that cam too, and headers and gear. -dulcich
Convertor is a Dynamic 10" Headers are Hedman cheapies and gearing is 3:91. Thanks.
Only thing missing then is the double pumper. What intake? Even with low compression, it should roast the tires all the way through first with that combo.
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Re: Sluggish 440 w/509 MP cam.
[Re: Viol8r]
#475509
09/21/09 07:36 PM
09/21/09 07:36 PM
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Joined: Feb 2005
Posts: 5,221 Branson, Mo.
joedust451
super gas
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super gas
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
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Quote:
Initial Timing?
I 2nd. this, most likely your dist. needs recurved.
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Re: Sluggish 440 w/509 MP cam.
[Re: Mr.Yuck]
#475513
09/22/09 08:04 AM
09/22/09 08:04 AM
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Joined: Sep 2004
Posts: 2,093 oberlin, Ohio
Rapid340
top fuel
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top fuel
Joined: Sep 2004
Posts: 2,093
oberlin, Ohio
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I would consider two things (in this order).
1) check/recurve distributor for about 18-20 degrees initial timing, 38 total.
2) if still unhappy, advance the cam to 102-103.
1971 Factory Appearing Duster 340 11.000 @ 122 mph
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Re: Sluggish 440 w/509 MP cam.
[Re: gch]
#475515
09/22/09 11:32 AM
09/22/09 11:32 AM
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Joined: Feb 2005
Posts: 5,221 Branson, Mo.
joedust451
super gas
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super gas
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
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I've run a few .509s, i wanted the sound of that cam, but the 1st. thing i did was raise the compression with some decent FTs, either KB237s or TRW 2255s, my 1 dart i installed a TM7 & 850dp., had 3.91s, Cheapie 4500 stall, MP dizzy, MSD box, drop the cam dot to dot on all of them, had the int. timing around 16-17*, total was 38* & light springs, they all ran great, always had to run MTs, street tires never had a chance. Those cams do like compression/timing & stall.
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Re: Sluggish 440 w/509 MP cam.
[Re: joedust451]
#475516
09/22/09 11:51 AM
09/22/09 11:51 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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This is normal for a 440 with too low a static ratio for the cam, and a cam that is very poorly made. What are the cylinder pressure readings? Blaming the carb is a hip-shot answer. Carb has nothing to do with it at this point, and vacuum carbs work off engine demand. If the enigne is wheezing, it wont work and tossing more fuel via accelerator pump at it wont help in the least.
Sorry, I edited it.. I missed a "4" in 440...lol
Last edited by moper; 09/22/09 11:55 AM.
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: Sluggish 440 w/509 MP cam.
[Re: gch]
#475517
09/22/09 03:17 PM
09/22/09 03:17 PM
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Joined: Jan 2003
Posts: 24,562 Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
I disagree on the throttle response with the vacuum secondary. Take a big cam with poor low speed response and slam it with a double shot of gas.BOG. I think the vacuum secondary would offer better response down low.He may need a different spring in the secondary to fine tune it. Advancing the cam a few degrees and running 15-18 initial timing should make a huge difference.
I should say that cam and a low compression engine and a vacuum isn't great. I had one on my old 73 440/509 combo. All it wanted to do was dump gas at w/ any PV. I just couldn't get it right. I went with a thermoquad and it really woke up the performance.
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Re: Sluggish 440 w/509 MP cam.
[Re: Mr.Yuck]
#475518
09/22/09 05:27 PM
09/22/09 05:27 PM
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Joined: Jan 2003
Posts: 4,296 Chicago, IL
TonyS451
master
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master
Joined: Jan 2003
Posts: 4,296
Chicago, IL
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I too have witnessed first hand how poorly a 509 cam will work without the right mix of parts. Your gear is fine, but that cam likes every bit of a 3800 stall (and then some). It will also wake up with 20+ degrees of initial and 36-38 total timing. The vacumm secondary carb will work, but the dp will be snappier when in proper tune. That cam can make some good power when all your ducks are in a row.
2 kids and a dog
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