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Re: Made changes! No Faster! Me Confused ???
[Re: 493_DART]
#1638055
06/27/14 12:56 AM
06/27/14 12:56 AM
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Joined: Aug 2003
Posts: 4,679
On the parachute mount
n20mstr
master
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master
Joined: Aug 2003
Posts: 4,679
On the parachute mount
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I always have my converter made....with the cam specs,most my question is this,you guys that swap cams and pick up, do you restall the converter ? IF NOT then you really don't know.....you can't just swap cams and compare. Often it's the Whole package....
Last edited by n20mstr; 06/27/14 12:59 AM.
....BAD A$$ STREET CAR.....
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Re: Made changes! No Faster! Me Confused ???
[Re: Monte_Smith]
#1638056
06/27/14 01:06 AM
06/27/14 01:06 AM
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Joined: Dec 2006
Posts: 3,667
Arizona
Chris'sBarracuda
master
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master
Joined: Dec 2006
Posts: 3,667
Arizona
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Quote:
All those changes allow you to pump more air through your air pump(engine) PROVIDED that it can. The cam is the cork, While the parts are CAPABLE of moving more air, the cam won't let them.
Monte
 ^^^^ This, but it's not what you wanted to hear.. 
Chris.. 
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Re: Made changes! No Faster! Me Confused ???
[Re: Chris'sBarracuda]
#1638057
06/27/14 02:31 AM
06/27/14 02:31 AM
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Joined: Aug 2003
Posts: 43,193
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,193
Bend,OR USA
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OP, when some changes don't make sense on the results there is usually a reason for the no change results  I like to make sure of the basics first like the fuel supply, shift points,RPM drop on teh shift(converter effeincy) header length and so on. Can you fatten the carb. up enough to slow the car down in the 1/4 mile? If not look at the fuel supply, if so look try shifting it sooner or later and look at the RPM drop on the shift into high gear. If the converter won't let the RPM drop below 4500 RPM no matter when you shift it look at trying another one of your other converters that you know will let the RPM drop enough to get it close to 4000 RPM on the gear change   Let us know what you do and find out  BTW, what RPM are you shifting at now? What is the RPM drop on the shift?
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Made changes! No Faster! Me Confused ???
[Re: Cab_Burge]
#1638058
06/27/14 05:45 AM
06/27/14 05:45 AM
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Joined: Jan 2003
Posts: 10,006
Frostbitefalls MN (Rocky&Bullw...
gregsdart
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,006
Frostbitefalls MN (Rocky&Bullw...
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Sometimes performance can be off for something that is taken for granted, like valve springs. If they aren't doing the best job, the car will be off quite a bit. Sometimes the needed springs are much bigger than recommended by the cam grinder, or just plain better springs. I found that to be true with a good sized roller years ago. It turned out the springs were the problem to the tune of .11 in the 1/8th mile. Those springs were up to spec, but a bad design that others had had problems with as well. Resonance frequency and spring weight is something often overlooked.
As far as critiquing the cam, that's part of the deal when you ask why a combo isn't working.
What density altitude was your best run at?
Last edited by gregsdart; 06/27/14 06:01 AM.
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Re: Made changes! No Faster! Me Confused ???
[Re: gregsdart]
#1638059
06/27/14 05:54 PM
06/27/14 05:54 PM
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Joined: Aug 2010
Posts: 167
mi
dirty magnum
member
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member
Joined: Aug 2010
Posts: 167
mi
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Re: Made changes! No Faster! Me Confused ???
[Re: dirty magnum]
#1638061
06/27/14 08:45 PM
06/27/14 08:45 PM
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Joined: Feb 2006
Posts: 474
Alberta, Canada
451Guy
OP
mopar
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OP
mopar
Joined: Feb 2006
Posts: 474
Alberta, Canada
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Cab - I shifted it at 7000 and the rpm dropped to 5500 - 5600. I have tried shifting it higher but it did no go any faster so there was no reason to still shift it up there. I have never tried shifting it lower.
Greg - The springs have about 35 runs on them since Dwayne Porter did the heads. I did not even consider them to be an issue. The car run good so I never really considered going there.
I had also thought about changing the carb but the one I have runs so good I have procrastinated on spending that money.
I do realize that a bunch of my stuff is left over or reused from my previous engine but unfortunately buying all new stuff for a new engine is not an option. I realize that this means my combination is not optimum.
Like Monty said maybe I have to put a cam in it to get all the other stuff to work.
Thanks again for the input
Thanx 451 Guy
512 cu in 71 Demon Super Street Car - NO LONGER - Broke Crank
Best ET 9.57 @ 139.96
451 cu in Pump Gas - 71 Demon Super Street Car
Best ET 9.99 @ 136.80
512 cu in 69 Charger R/T
Best ET 11.39 @ 118.11
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Re: Made changes! No Faster! Me Confused ???
[Re: Chris'sBarracuda]
#1638062
06/27/14 09:32 PM
06/27/14 09:32 PM
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Joined: Jan 2003
Posts: 3,871
Smyrna, South Carolina
STEFF
master
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master
Joined: Jan 2003
Posts: 3,871
Smyrna, South Carolina
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Quote:
Quote:
All those changes allow you to pump more air through your air pump(engine) PROVIDED that it can. The cam is the cork, While the parts are CAPABLE of moving more air, the cam won't let them.
Monte
^^^^ This, but it's not what you wanted to hear..
Chris..
I was thinking the same thing........not the answer the o.p. wanted to hear. Unfortunately, the most important part of the induction system wasn't changed. A cylinder head change should never be considered without a cam change to compliment the new heads.
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Re: Made changes! No Faster! Me Confused ???
[Re: racerx]
#1638064
06/27/14 11:42 PM
06/27/14 11:42 PM
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Joined: Jun 2009
Posts: 644
Minnesota
Barnstorm
mopar
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mopar
Joined: Jun 2009
Posts: 644
Minnesota
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If that combo could 60ft 1.25-1.30 it would be a 9.40 car...speed isn't bad.
The little old lady from Pasadena is back!
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Re: Made changes! No Faster! Me Confused ???
[Re: 451Guy]
#1638065
06/28/14 04:38 PM
06/28/14 04:38 PM
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Joined: Nov 2004
Posts: 6,890
North Alabama
Monte_Smith
master
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master
Joined: Nov 2004
Posts: 6,890
North Alabama
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Quote:
Cab - I shifted it at 7000 and the rpm dropped to 5500 - 5600. I have tried shifting it higher but it did no go any faster so there was no reason to still shift it up there. I have never tried shifting it lower.
Greg - The springs have about 35 runs on them since Dwayne Porter did the heads. I did not even consider them to be an issue. The car run good so I never really considered going there.
I had also thought about changing the carb but the one I have runs so good I have procrastinated on spending that money.
I do realize that a bunch of my stuff is left over or reused from my previous engine but unfortunately buying all new stuff for a new engine is not an option. I realize that this means my combination is not optimum.
Like Monty said maybe I have to put a cam in it to get all the other stuff to work.
Thanks again for the input
One other thing here.......that is a LOT of rpm drop on the shift. Two things........one, either you are turning the motor WAY too hard for that camshaft, or the converter is too tight at the shift to make it drop so much rpm.......Does the motor accelerate good AFTER the shift, or does it just lay on the converter
Monte
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Re: Made changes! No Faster! Me Confused ???
[Re: Sport440]
#1638070
07/01/14 08:32 PM
07/01/14 08:32 PM
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Joined: Jan 2003
Posts: 10,006
Frostbitefalls MN (Rocky&Bullw...
gregsdart
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,006
Frostbitefalls MN (Rocky&Bullw...
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Quote:
That 512 has no use for that 6200 stall vert. Put the 5200 back in it if you have it.
The cams not terrible IMO, but could use some more lift and a 110 lsa.
Based on your Dyno chart, the Vert change would be the biggest bang for the buc. No bucs if you still have the old one.
Once he gets this deal sorted out and puts a good cam in it, it will want 7100 to 7200 shift points, and will tolerate a 6500 flash converter very well. More than a couple of us have found lose really flys. I just spent $1500 to find out my 6600 stall is a LOT faster than the new 5600 stall I put in it. I shift at 7100. My peak torque is around 5300.
Last edited by gregsdart; 07/01/14 08:33 PM.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Made changes! No Faster! Me Confused ???
[Re: gregsdart]
#1638071
07/02/14 07:14 PM
07/02/14 07:14 PM
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Joined: Feb 2006
Posts: 474
Alberta, Canada
451Guy
OP
mopar
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OP
mopar
Joined: Feb 2006
Posts: 474
Alberta, Canada
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Please find attached a copy of the cam card. Hardcore - I am in total agreement with you! I was not expecting anything from the head change. I had this exact conversation with Dwayne Porter when I ordered the heads. Neither one of us thought they would make much of a difference. My SR's flowed awesome but they leaked everywhere. Dwayne's prediction was that the car would not ET any quicker but it may MPH a little quicker. He proved to be correct. Monty - I will check my play back tach. I made a couple quick hits at the last race and then it went in the trailer. Lance - I may take you up on that. But I will buy it! I don't have much luck with borrowed stuff 
Thanx 451 Guy
512 cu in 71 Demon Super Street Car - NO LONGER - Broke Crank
Best ET 9.57 @ 139.96
451 cu in Pump Gas - 71 Demon Super Street Car
Best ET 9.99 @ 136.80
512 cu in 69 Charger R/T
Best ET 11.39 @ 118.11
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Re: Made changes! No Faster! Me Confused ???
[Re: B3422W5]
#1638073
07/02/14 08:45 PM
07/02/14 08:45 PM
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Joined: Feb 2006
Posts: 474
Alberta, Canada
451Guy
OP
mopar
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OP
mopar
Joined: Feb 2006
Posts: 474
Alberta, Canada
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When I bought the cam Scott was providing tons of cams for members here with great results. Over all I am very happy with the cam. It replaced the Indy R2 cam that I had in it that was a valve train killer! Car ran better also. I have now had the chance to deal with Dwayne on a bunch of stuff and I would not hesitate to go with a cam that he spec'd. We will see. Cams are like women. Everyone likes em a little different
Thanx 451 Guy
512 cu in 71 Demon Super Street Car - NO LONGER - Broke Crank
Best ET 9.57 @ 139.96
451 cu in Pump Gas - 71 Demon Super Street Car
Best ET 9.99 @ 136.80
512 cu in 69 Charger R/T
Best ET 11.39 @ 118.11
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