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Re: Whats holding me in the 109 MPH range [Re: Dartcuda] #456609
09/01/09 08:55 PM
09/01/09 08:55 PM
Joined: Aug 2007
Posts: 498
El Dorado Ca
6
65signet Offline
mopar
65signet  Offline
mopar
6

Joined: Aug 2007
Posts: 498
El Dorado Ca
I have friend runs just a 340 with eddys OOTB in an A body runs 11.70s bigger cam than what you run, but a lot less cubes.


1965 Plymouth Barracuda 273 M/SA
1970 Plymouth Duster 360/904 10.60s with J heads
Re: Whats holding me in the 109 MPH range [Re: Brian Hafliger] #456610
09/01/09 09:03 PM
09/01/09 09:03 PM
Joined: Oct 2003
Posts: 3,698
NE Oklahoma
V
Von Offline
master
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Joined: Oct 2003
Posts: 3,698
NE Oklahoma
Quote:

[unless it's a real street car, a nice 4500 converter would do wonders but it'll be crap for the street.





Why

Sorry to get offtrack but why do most people say a high stall converter is junk on the street???

The TA 8inch (5k flash off the footbrake)in my stuff drives around town very close to a stock converter. In fact the guy at the local muffler shop backed my car off of the rack and asked me if I had a stock 'vert in it. No, I replied, just a quality converter.


72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72. Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
Re: Whats holding me in the 109 MPH range [Re: dizuster] #456611
09/01/09 09:15 PM
09/01/09 09:15 PM
Joined: Jan 2003
Posts: 6,591
Canton, Ohio
S
Sport440 Offline
master
Sport440  Offline
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Posts: 6,591
Canton, Ohio
Quote:

Quote:


The cam is wrong, the intake is wrong, and the convertor is wrong...for starters.






I don't see it like that at all...

The cam matches the intake, which matches the converter, which matches the compression ratio, which matches the original intent of the car... it's a street car.

No doubt a 416" E-headed combo could be faster, but I don't think it's all that far off with the parts you have. It's a very reliable, low RPM, street combo.

However as everyone has said, there are certainly oppertunities to make the car faster. More cam, looser converter, porting the heads, etc... will all do wonders for the ET/MPH, but the drivability will be sacrificed.

These 4" crank motors seem to love carb, so I don't think putting a 750 on it would help. Especially since it doesn't have any HP/MPH at the big end. A smaller carb may help the bottom end, but not the top end.

If you wanted to keep it streetable, I would start with an intake, and a low gear set for the 904 (if it doesn't have one already). The lack of plenum volume in that intake is definately not helping. The low gear set would be a bandaid for the lack of converter stall speed too.

Those two things should pick it up without hurting the drivability at all, and neither one is all that pricy to do...

My ...





As currently set up I think its running pretty good and as it should. With some simple changes as mentioned it can easily be faster. I would probably change out the intake and vert first. mike

Re: Whats holding me in the 109 MPH range [Re: 65cuda] #456612
09/01/09 09:51 PM
09/01/09 09:51 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
Master
MR_P_BODY  Offline
Master

Joined: Jun 2003
Posts: 52,972
Romeo MI
Stroker motors love duration... you have more CI and
your still trying to get the volume of air/fuel through
a small intake so if you keep the valve open longer
its going to help. Its either port work and a intake
to get the fuel/air there in the shorter time(your currant
cam) or lengthen your time for filling the cyl with
your currant set up(duration)

Re: Whats holding me in the 109 MPH range [Re: 65cuda] #456613
09/01/09 09:51 PM
09/01/09 09:51 PM
Joined: Jan 2003
Posts: 2,511
Tampa , Fl
MoparJoe Offline
super gas
MoparJoe  Offline
super gas

Joined: Jan 2003
Posts: 2,511
Tampa , Fl
Needs more cam/converter and intake, One of my friends runs the same basic combo and runs 105-106mph in the 1/8, he was running 99-100mph 1/8 119-120mph in the 1/4 with a E-head 340.

The latest motor is most of the old motor- heads/intake/carb etc with a 4" crank and different cam, less duration but .040" more lift.

Re: Whats holding me in the 109 MPH range [Re: Von] #456614
09/01/09 10:33 PM
09/01/09 10:33 PM
Joined: Jan 2003
Posts: 27,421
Balt. Md
3
383man Offline
Too Many Posts
383man  Offline
Too Many Posts
3

Joined: Jan 2003
Posts: 27,421
Balt. Md
Quote:

Quote:

[unless it's a real street car, a nice 4500 converter would do wonders but it'll be crap for the street.





Why

Sorry to get offtrack but why do most people say a high stall converter is junk on the street???

The TA 8inch (5k flash off the footbrake)in my stuff drives around town very close to a stock converter. In fact the guy at the local muffler shop backed my car off of the rack and asked me if I had a stock 'vert in it. No, I replied, just a quality converter.





I agree with that. I use a Dynamic 9.5 street/strip converter and it works great on the street. It will flash about 4200 at the track but drives around like a normal converter on the street. With the technolgy now a days in converters I see people driving 8 to 10" converters on the street all the time so yes he can run more stall and still drive it on the street.


And by the way thats a very nice looking Duster you have. Ron

Last edited by 383man; 09/01/09 10:34 PM.
Re: Whats holding me in the 109 MPH range [Re: 383man] #456615
09/01/09 10:39 PM
09/01/09 10:39 PM
Joined: Jan 2003
Posts: 4,616
Kissimmee Fl.
D
dusturbd340W5 Offline
master
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D

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Posts: 4,616
Kissimmee Fl.
Quote:

Quote:

Quote:

[unless it's a real street car, a nice 4500 converter would do wonders but it'll be crap for the street.





Why

Sorry to get offtrack but why do most people say a high stall converter is junk on the street???

The TA 8inch (5k flash off the footbrake)in my stuff drives around town very close to a stock converter. In fact the guy at the local muffler shop backed my car off of the rack and asked me if I had a stock 'vert in it. No, I replied, just a quality converter.





I agree with that. I use a Dynamic 9.5 street/strip converter and it works great on the street. It will flash about 4200 at the track but drives around like a normal converter on the street. With the technolgy now a days in converters I see people driving 8 to 10" converters on the street all the time so yes he can run more stall and still drive it on the street.


And by the way thats a very nice looking Duster you have. Ron




I would have no problem at all driving around the street with my TA 8"


70 duster full chassis super pro 416 CNC Indybrock heads 727 w/brake

best so far 1.212 60 6.219 in 1/8 at 110.88 9.768 at 137.81 1/4
Re: Whats holding me in the 109 MPH range [Re: 65cuda] #456616
09/01/09 11:05 PM
09/01/09 11:05 PM
Joined: Jan 2003
Posts: 1,072
The Sunny Shuswap
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dodgefarmer Offline
super stock
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Posts: 1,072
The Sunny Shuswap
First thing that I'd try is pulling the muffs.

Randy

Re: Whats holding me in the 109 MPH range [Re: dodgefarmer] #456617
09/01/09 11:14 PM
09/01/09 11:14 PM
Joined: Aug 2003
Posts: 43,309
Bend,OR USA
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Cab_Burge Offline
I Win
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Posts: 43,309
Bend,OR USA
Quote:

First thing that I'd try is pulling the muffs.

Randy


I don't see any posts showing the exhaust sytem or the fuel system. you say it goes faster on the ET but the MPH stays the same, you can't fix what you don't know is wrong. I would do one or the other first, either try jetting the carb. up to see if you can slow the 1/4 MPH down by making it fat, if it doesn't slow down fix the fuel system now If it does slow down by jetting it to rich try leaning it down until it slows down and try removing the exhaust at the track on the same day that you have already made some runs, one or two. BTW, what size and type of exhaust and mufflers are you using? I owned and raced a car that would pick up .84 EY and 8.5 MPH by removing the side pipes and turbo mufflers Let us know what you do and the results please I think the best way to learn, especially on race cars, is with the hands on approach of doing it yourself TEST,test and tests some more


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Whats holding me in the 109 MPH range [Re: 65cuda] #456618
09/02/09 12:02 AM
09/02/09 12:02 AM
Joined: Mar 2008
Posts: 883
Affton MO
Q
qwkmopardan Offline
super stock
qwkmopardan  Offline
super stock
Q

Joined: Mar 2008
Posts: 883
Affton MO
What can a 416 do?

This car has a 418, not a 416, and still using ported production cyl. heads from a 1973 360 maxi-van, 587 castings, and a relativly small flat tappet cam, .590-.590 X 276-276. Mis-matched components can kill the HP and TQ output. This combo has gone 9.68 at 135+ With a 1.261 60FT. Car weighs around 3050lbs.





This one is a 408 with similar heads as the Demon but car weighs Over 4100lbs and has a full exh with 4 mufflers. Cam has only .527 lift and 262 at .050. It has near 15000 miles on it now and still goung strong. Best 1/4 mile pass on this car is 11.600 at 116mph. Both of these cars have nicely ported Victor 340 intakes. The "300" has a 9" J converter and the Demon has an 8" converter.


Re: Whats holding me in the 109 MPH range [Re: qwkmopardan] #456619
09/02/09 12:39 AM
09/02/09 12:39 AM
Joined: Jan 2003
Posts: 6,591
Canton, Ohio
S
Sport440 Offline
master
Sport440  Offline
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S

Joined: Jan 2003
Posts: 6,591
Canton, Ohio
Nice work, you know what your doing.!! mike

Re: Whats holding me in the 109 MPH range [Re: Cab_Burge] #456620
09/02/09 06:22 AM
09/02/09 06:22 AM
Joined: Feb 2005
Posts: 4,321
Prospect, PA
BSB67 Offline
master
BSB67  Offline
master

Joined: Feb 2005
Posts: 4,321
Prospect, PA
Quote:

Quote:

First thing that I'd try is pulling the muffs.

Randy


I don't see any posts showing the exhaust sytem or the fuel system. you say it goes faster on the ET but the MPH stays the same, you can't fix what you don't know is wrong. I would do one or the other first, either try jetting the carb. up to see if you can slow the 1/4 MPH down by making it fat, if it doesn't slow down fix the fuel system now If it does slow down by jetting it to rich try leaning it down until it slows down and try removing the exhaust at the track on the same day that you have already made some runs, one or two. BTW, what size and type of exhaust and mufflers are you using? I owned and raced a car that would pick up .84 EY and 8.5 MPH by removing the side pipes and turbo mufflers Let us know what you do and the results please I think the best way to learn, especially on race cars, is with the hands on approach of doing it yourself TEST,test and tests some more








The OP is right in that the mph is off for what he has. His combination, as is, should make at least 1 hp/cu.in. That would put him at 115 mph assuming a 3500 lb race weight. Here is what I would check:

1. Good fuel pressure through the traps
2. Is there a plugged muffler.
3. Make sure you don't have a junk converter. Cheep converter will slip a bunch up top and give away a bunch of mph.

Then

Keep tuning, and go to Edgewater in the late fall

Let us know how it goes

Re: Whats holding me in the 109 MPH range [Re: 65cuda] #456621
09/02/09 07:42 AM
09/02/09 07:42 AM
Joined: Jan 2005
Posts: 3,699
Newport, Mi
Evil Spirit Offline
master
Evil Spirit  Offline
master

Joined: Jan 2005
Posts: 3,699
Newport, Mi
I find it amusing that in 31 posts that there has been suggestions of changing carbs, cams, converters, etc. and no one has even mentioned TIMING . Should need about 15* initial, and about 35* total as a good starting point, with good cap, wires, etc., and a MSD or other quality ignition system. Since the MPH and ET are close, it's down on power, and poor ignition or wrong timing is a good place to look. Damper timing marks correct? I think it's a lot cheaper to finish the basic tune than throw parts at it, but thats just me.


Free advice and worth every penny...
Factory trained Slinky rewinder.........
Re: Whats holding me in the 109 MPH range [Re: Evil Spirit] #456622
09/02/09 07:43 AM
09/02/09 07:43 AM
Joined: Aug 2007
Posts: 1,564
St. Clair Shores, Michigan
bigsbigelow Offline
pro stock
bigsbigelow  Offline
pro stock

Joined: Aug 2007
Posts: 1,564
St. Clair Shores, Michigan
Quote:

I find it amusing that in 31 posts that there has been suggestions of changing carbs, cams, converters, etc. and no one has even mentioned TIMING . Should need about 15* initial, and about 35* total as a good starting point, with good cap, wires, etc., and a MSD or other quality ignition system. Since the MPH and ET are close, it's down on power, and poor ignition or wrong timing is a good place to look. Damper timing marks correct? I think it's a lot cheaper to finish the basic tune than throw parts at it, but thats just me.







Ryan "Bigs" '73 Duster (BLKDUST) - Black, 100% factory sheet metal, flat hood, 346 cid, J Heads, and a bench seat. http://s268.photobucket.com/albums/jj1/bigsbigelow/ Best to date: 12.40 @ 109 mph
Re: Whats holding me in the 109 MPH range [Re: bigsbigelow] #456623
09/02/09 07:47 AM
09/02/09 07:47 AM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
Master
MR_P_BODY  Offline
Master

Joined: Jun 2003
Posts: 52,972
Romeo MI
Quote:

Quote:

I find it amusing that in 31 posts that there has been suggestions of changing carbs, cams, converters, etc. and no one has even mentioned TIMING . Should need about 15* initial, and about 35* total as a good starting point, with good cap, wires, etc., and a MSD or other quality ignition system. Since the MPH and ET are close, it's down on power, and poor ignition or wrong timing is a good place to look. Damper timing marks correct? I think it's a lot cheaper to finish the basic tune than throw parts at it, but thats just me.










At some time you have to ASSUME that they have checked
the basics before they start asking for help....
at least thats my opinion

Re: Whats holding me in the 109 MPH range [Re: MR_P_BODY] #456624
09/02/09 08:48 AM
09/02/09 08:48 AM
Joined: Jan 2005
Posts: 3,699
Newport, Mi
Evil Spirit Offline
master
Evil Spirit  Offline
master

Joined: Jan 2005
Posts: 3,699
Newport, Mi








At some time you have to ASSUME that they have checked
the basics before they start asking for help....
at least thats my opinion






Yeah, Mike, I know. I just thought it was funny that no-one mentioned the cheapest thing that can cost HP.


Free advice and worth every penny...
Factory trained Slinky rewinder.........
Re: Whats holding me in the 109 MPH range [Re: dizuster] #456625
09/02/09 09:46 AM
09/02/09 09:46 AM
Joined: Jan 2003
Posts: 11,729
Portage,michigan
B
B3422W5 Offline
I Live Here
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Portage,michigan
Quote:

Quote:


The cam is wrong, the intake is wrong, and the convertor is wrong...for starters.






I don't see it like that at all...

The cam matches the intake, which matches the converter, which matches the compression ratio, which matches the original intent of the car... it's a street car.

No doubt a 416" E-headed combo could be faster, but I don't think it's all that far off with the parts you have. It's a very reliable, low RPM, street combo.

However as everyone has said, there are certainly oppertunities to make the car faster. More cam, looser converter, porting the heads, etc... will all do wonders for the ET/MPH, but the drivability will be sacrificed.

These 4" crank motors seem to love carb, so I don't think putting a 750 on it would help. Especially since it doesn't have any HP/MPH at the big end. A smaller carb may help the bottom end, but not the top end.

If you wanted to keep it streetable, I would start with an intake, and a low gear set for the 904 (if it doesn't have one already). The lack of plenum volume in that intake is definately not helping. The low gear set would be a bandaid for the lack of converter stall speed too.

Those two things should pick it up without hurting the drivability at all, and neither one is all that pricy to do...

My ...





You will note, that when i made my comments,(1st post in the thread) he was complaining about how the car ran, and had made no mention of it being a street car, just why it was only going 109.. I still say my advice is sound.

BTW, My little brother has a 9.5 compression 360 that runs 11.40's and i suspect we will get it to go a good bit quicker(flat tappet, 3325 pounds)so i dont think i was talking out of school that this guys car, even at that compression could go mighty close to 11 flat if all the components were correctly matched. I would bet money i could make a 416 at 10 to 1 do that, at his weight.


69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, low 10.30’s 1/4
1.41 best 60 foot
6.56 at 104.17



Re: Whats holding me in the 109 MPH range [Re: B3422W5] #456626
09/02/09 11:30 AM
09/02/09 11:30 AM
Joined: Feb 2003
Posts: 12,675
Columbia, CT
M
moper Offline
I Live Here
moper  Offline
I Live Here
M

Joined: Feb 2003
Posts: 12,675
Columbia, CT
OP stated trap mph. I asked for trap RPM of the engine. I think before everyone re-designs this engine to match theirs/a freinds/a guy they read abouts.... more has to be known. Do you have the incrementals for 60', 300', 600', 1000'? Going to the track and making changes that improve are great. Tracking those changes and comparing the results is where the racer comes out and the street guy falls back.


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.
Re: Whats holding me in the 109 MPH range [Re: B3422W5] #456627
09/02/09 11:36 AM
09/02/09 11:36 AM
Joined: Feb 2003
Posts: 515
Dayton, Ohio
6
65cuda Offline OP
mopar addict
65cuda  Offline OP
mopar addict
6

Joined: Feb 2003
Posts: 515
Dayton, Ohio
Thanks you guys so much good info. yes i did the basics. i have been changing the timming. it is at about 20 all in it's 36-37. i was running a 750 vac sec. it ran a 12.30 with that carb. i just last week pulled all the stock fuel lines and ran 3/8 all the way. i put the 950 back on and i pulled the sec. PV and put 86s in the back and upped the prim. to 80s thats when it ran a best of 12.05. i am going to drop the muffs tomorrow night and take the jet kit with me. also let my wife drive she is at least a 100# less than me. i have been switching carbs back and forth 950 and 750. then put the 750 and air cleaner on for shows. also i did all the work myself i built the motor and did the paint and body. racing is new for me. i always just had show cars. but my wife and i are liking this race thing. i can see i will need two race cars at this pace. we have to argue to see who gets to drive. the muffs are flowmasters with an h pipe turn downs in front of the 8 3/4. headers are headman streets 1 5/8 tubes.

5457376-P1230023.JPG (47 downloads)

65 Cuda 360,3.23 SG-13.97 @99.4, 88 D100, 2000 Kota Qcab, 71 Duster 416 11.84 @110., 73 Imp ,(2)72 & (1)71 Dart Swingers
GarysMocars Legendary Dealer
Re: Whats holding me in the 109 MPH range [Re: B3422W5] #456628
09/02/09 01:28 PM
09/02/09 01:28 PM
Joined: Jan 2005
Posts: 3,635
Oakland, MI
D
dizuster Offline
master
dizuster  Offline
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D

Joined: Jan 2005
Posts: 3,635
Oakland, MI
Quote:



You will note, that when i made my comments,(1st post in the thread) he was complaining about how the car ran, and had made no mention of it being a street car, just why it was only going 109.. I still say my advice is sound.





Sorry I didn't mean that as a shot at your advice to pick the car ET/MPH up. You're advice was spot on to do that.

I just meant to say the parts weren't mis-matched to each other, or the original intent of the car.

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