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How good are the P7 engines for drag racing?
#1212125
04/08/12 12:39 AM
04/08/12 12:39 AM
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Joined: Jun 2008
Posts: 577
Arkansas
Adrielp
OP
mopar
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OP
mopar
Joined: Jun 2008
Posts: 577
Arkansas
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Pros, cons and such. Thanks!
Adriel Paradise
Substation Design Engineer III
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Re: How good are the P7 engines for drag racing?
[Re: S/ST 3040]
#1212132
04/08/12 08:46 PM
04/08/12 08:46 PM
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Joined: Feb 2009
Posts: 1,532
off the grid
340B5
pro stock
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pro stock
Joined: Feb 2009
Posts: 1,532
off the grid
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I really like the sound of that thing. Would have thought more rpm.
Some of the parts can be had for a song. So what is the expensive part? (downside)
Yeah, it's got a smallblock.
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Re: How good are the P7 engines for drag racing?
[Re: 340B5]
#1212133
04/08/12 08:53 PM
04/08/12 08:53 PM
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Joined: Jul 2006
Posts: 4,595
On the south side of Nowhere
S/ST 3040
master
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master
Joined: Jul 2006
Posts: 4,595
On the south side of Nowhere
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Quote:
I really like the sound of that thing. Would have thought more rpm.
Bob was granny-ing it on the new car. (car, suspesion, brakes, engine, rear, etc.)
It dropped a valve headed for the water box the next round.
Just from memory, I think it went 5.83 @ 114 MPH
He would have been shifting it @ 9000+
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Re: How good are the P7 engines for drag racing?
[Re: 23T Hemmee]
#1212135
04/09/12 01:35 AM
04/09/12 01:35 AM
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Joined: Feb 2005
Posts: 5,207
Menomonee Falls
DemonDust
master
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master
Joined: Feb 2005
Posts: 5,207
Menomonee Falls
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I'd like to think they preform very well. I've had a best of 109 mph 6.934 in the 1/8 on glare ice. And that was with a brand new setup. Still working on it.. Getting rid of the leaf springs and putting ladder bars in. I'm hoping to get it to the asphalt a few times this summer and see how it does. R5P7 in a duster 1/8 mile ice drag strip
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Re: How good are the P7 engines for drag racing?
[Re: Adrielp]
#1212136
04/09/12 03:07 AM
04/09/12 03:07 AM
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Joined: Jan 2003
Posts: 6,142
Melbourne , Australia
LA360
master
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master
Joined: Jan 2003
Posts: 6,142
Melbourne , Australia
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For an all out drag racing application you would start with a set of raw castings that you would send to someone like CFE or Slawko (I know these two companies have done development on these heads)
They are a very good, well engineered engine that can perform well. I do think that a oval track head with a drag racing specific camshaft could also run a decent number also. You won't be running anything under 6500-7000 in stall speed, in an all out application is it going to be closer to 8500-9000.
An all out engine is going to cost plenty of $$$, you're not going to get any change out of $60-80K
Alan Jones
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Re: How good are the P7 engines for drag racing?
[Re: LA360]
#1212137
04/09/12 03:50 AM
04/09/12 03:50 AM
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Joined: Sep 2005
Posts: 769
Europa, Estonia
Georg
super stock
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super stock
Joined: Sep 2005
Posts: 769
Europa, Estonia
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Going to swap my Charger with Valiant soon and prepare to install my R5/P7 into it.
Ofcorse this Valiant dont have best tranny for R5 motor ( PowerGlide with 6500 RPM torque converter ) but car is pretty light....so we will see later this summer hopefully how it works out
Outlaw Plymouth Valiant
R5/P7 Powered by Liuzzo Racing
COMP Performance Group dealer in Baltic
Premium Performance
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Re: How good are the P7 engines for drag racing?
[Re: LA360]
#1212138
04/09/12 11:00 AM
04/09/12 11:00 AM
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Joined: Jan 2010
Posts: 588
Franklin, TN
23T Hemmee
mopar
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mopar
Joined: Jan 2010
Posts: 588
Franklin, TN
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Quote:
An all out engine is going to cost plenty of $$$, you're not going to get any change out of $60-80K
Maybe that much in Oz with all of the shipping charges you guys have to endure, but my friend in the dragster has less than $20K in his and almost $6K was in the Engler Fuel Injection, and dry sump system. I forgot to mention, they don't have have any provision for wet-sump oiling, so dry-sump is a necessity.
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Re: How good are the P7 engines for drag racing?
[Re: 23T Hemmee]
#1212139
04/09/12 11:53 AM
04/09/12 11:53 AM
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Joined: Jan 2003
Posts: 11,713
Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,713
Portage,michigan
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The best( and about only) example of a P7 motor drag racing on this forum was my buddies 68 Dart he raced all summer, year before last.
68 Dart 3000 pounds with driver
904
Old busch restrictor plate motor. Small 248/258 roller cam, compression was at about 12 to 1.
He used old w2 2 inch headers he made work
4150 carb, forget how big.
Car went low 9.40's at 142-143 MPH, probably put 50-60 passes on it, then sold the motor to one guy, and the car to another.
So with probably not the " best" p7 motor to use, he still got it to fly.
With bigger cam and more compression i have no doubt it could have threatened the 8's. Those heads are just darn good.
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, 10.40 @127 1/4
1.41 best 60 foot
6.60 at 103.90 1/8
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Re: How good are the P7 engines for drag racing?
[Re: B3422W5]
#1212140
04/09/12 12:13 PM
04/09/12 12:13 PM
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Joined: Feb 2005
Posts: 5,207
Menomonee Falls
DemonDust
master
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master
Joined: Feb 2005
Posts: 5,207
Menomonee Falls
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Quote:
The best( and about only) example of a P7 motor drag racing on this forum was my buddies 68 Dart he raced all summer, year before last.
Wow, a little arrogant there.. Just cause I don't race asphalt, I'm not good enough to be an example??? I'm glad your BUDDY is the only one GOOD enough to be taken into consideration in this forum... Just another example of all you clicky azzholes on here... IF you don't drag race assphalt you're no good...
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Re: How good are the P7 engines for drag racing?
[Re: DemonDust]
#1212141
04/09/12 12:18 PM
04/09/12 12:18 PM
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Joined: Jan 2003
Posts: 11,713
Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,713
Portage,michigan
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Quote:
Quote:
The best( and about only) example of a P7 motor drag racing on this forum was my buddies 68 Dart he raced all summer, year before last.
Wow, a little arrogant there.. Just cause I don't race asphalt, I'm not good enough to be an example??? I'm glad your BUDDY is the only one GOOD enough to be taken into consideration in this forum... Just another example of all you clicky azzholes on here... IF you don't drag race assphalt you're no good...
Last i checked this is a drag racing forum. I wasnt trying to be arrogant, just stating a fact, he actually raced one a whole season. Only person i know who has done so.
Lighten up dude, i didnt say he was good, bad or indifferent, just said he raced it, and posted his basic combo and what it ran.
Your ice racing deal has zero to do with this forum, unless they changed it from drag racing.
I have posted on here for 10 years, go pack sand.
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, 10.40 @127 1/4
1.41 best 60 foot
6.60 at 103.90 1/8
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Re: How good are the P7 engines for drag racing?
[Re: B3422W5]
#1212143
04/09/12 12:31 PM
04/09/12 12:31 PM
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Joined: Feb 2005
Posts: 5,207
Menomonee Falls
DemonDust
master
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master
Joined: Feb 2005
Posts: 5,207
Menomonee Falls
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Quote:
Quote:
Quote:
The best( and about only) example of a P7 motor drag racing on this forum was my buddies 68 Dart he raced all summer, year before last.
Wow, a little arrogant there.. Just cause I don't race asphalt, I'm not good enough to be an example??? I'm glad your BUDDY is the only one GOOD enough to be taken into consideration in this forum... Just another example of all you clicky azzholes on here... IF you don't drag race assphalt you're no good...
Last i checked this is a drag racing forum. I wasnt trying to be arrogant, just stating a fact, he actually raced one a whole season. Only person i know who has done so.
Lighten up dude, i didnt say he was good, bad or indifferent, just said he raced it, and posted his basic combo and what it ran.
Your ice racing deal has zero to do with this forum, unless they changed it from drag racing.
I have posted on here for 10 years, go pack sand.
Are you kidding me?? I know it's a drag racing forum you frickin Douche. How is drag racing on ice not drag racing??? Please tell me sir why I don't qualify? Sorry my 7 years isn't good enough for your 10.. Once again you go with I'm bigger and better then you...
And I have 3 seasons drag racing on mine... 
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Re: How good are the P7 engines for drag racing?
[Re: produster]
#1212144
04/09/12 12:32 PM
04/09/12 12:32 PM
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Joined: Jan 2003
Posts: 11,713
Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,713
Portage,michigan
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Quote:
The one down fall I have heard on these motors is the valve stem size and running a bigger spring pressure for bigger cam for drag racing. But I know they, valve guides can be made bigger.
I think that is the biggest down fall of these motors for drag racing. A cam change, better intake, bigger carb, a little off the head to up the compression and you can look in upwards of 1000hp. If given the time and effort you could have a killer set up.
Only issue is the limited amount of trans stuff. Jesse is the only one I know doing some sort of adapter.
When my project is a little more firm I will reveal what I am doing and let the nay sayers tear it apart.
Bondo Bob also does adaptors, My buddy used one of his and it worked flawlessly.
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, 10.40 @127 1/4
1.41 best 60 foot
6.60 at 103.90 1/8
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