MoparFins

Techical Discussions => Tech- - Engine => Topic started by: Steve on March 11, 2009, 08:23:07 PM

Title: Theory question to become reality
Post by: Steve on March 11, 2009, 08:23:07 PM
Specs
 
Magnum Engine 5.2 vs 5.9
 
5.2 (318)   220 HP  300 Ft Lb Torque  Intake Valve: 1.88"   Exhaust Valve:  1.60"
5.9 (360)   245 HP  335 FT LB Torque  Intake Valve: 1.88"   Exhaust Valve   1.62"
 
My current Cam is a 236 Int/242ext duration  This is a 500 to 5000 RPM Street Cam
 
OK  Looking at all this, it looks like it would be no problem.  Just a slight exhaust valve difference.
 
So
 
I acquired a 5.9 Magnum Complete, cheap.  Have been hunting all over for one.  When I last talked to EBugger, he said the car is screaming for a 360.  Maybe it is.  I have been saying the HP to weight has been a bit light all along.  I am estimating the Polaraco 5.2 to be in the 250 HP range.
 
What I am thinking of, instead of the blower is building the 5.9 block to new again and adding the right cam.  Then looking at the breathing it has, maybe going to a 4 BBL throttle body with the MPI injection.  Then maybe a computer system.  ODP2 possibly.
 
This is what I want to do
 
I would like to get into the 300 HP range, without dropping a lung.  I am going to try to maintain my MPG at the same time.  I have heard it could possibly go up.
 
I can use the same heads.  Everything else on the 5.2 I can reuse.  The Hughes Intake is an example.  I have a set of Hedman headers on it too.
 
I need some help choosing the right cam to do the job.
 
Help me choose the right cam.
 
 
 
 
Title: Theory question to become reality
Post by: Stitcherbob on March 11, 2009, 10:18:33 PM
I nominate Velcro as the official motor mount of the Polaraco!

Title: Theory question to become reality
Post by: Stan Paralikis on March 12, 2009, 03:46:22 AM
Download the Comp Cam Camquest software.  It's usually right on the money.

 Link to free cam selection software (http://www.compcams.com/Camquest/)


Title: Theory question to become reality
Post by: Steve on March 12, 2009, 07:56:48 AM
Thanks Stan I didn't know they had that.
 
I am totally ignorant to Cam Shafts
 
 
And Bob. . . You never did anything like this so keep your trap shut
Title: Theory question to become reality
Post by: Snotty on March 12, 2009, 08:59:21 AM
Hey, I heard Bobby uses velcro all the time, so leave him alone!!
 
(http://www.moparfins.com/forum/smileys/smiley2.gif)
Title: Theory question to become reality
Post by: Stan Paralikis on March 12, 2009, 09:22:59 AM

Quote from: POLARACO
I am totally ignorant to Cam Shafts
It's a long thingy that goes around and around and bumps some stuff up and down....
(http://www.moparfins.com/forum/smileys/smiley2.gif)

Title: Theory question to become reality
Post by: Stitcherbob on March 12, 2009, 09:36:17 AM

 
 
[/QUOTE]


I seem to remember that the Magnum swap was my idea.....while you were futzing around with that laptop on the Gold Fury's EFI system....and the Hughes manifold was my suggestion.....sheesh

Title: Theory question to become reality
Post by: Arlen Vander Hoff on March 12, 2009, 11:58:33 AM
I didn't think there was that much difference in the HP between the two.
Title: Theory question to become reality
Post by: James Brown Jr, on March 12, 2009, 12:26:51 PM
yea but isn't there a torque differance???
Title: Theory question to become reality
Post by: Steve on March 12, 2009, 01:06:41 PM
Quote from: stitcherbob
Quote from: POLARACO
 
 
 
No I had that idea for a long time before you brought it up.  I just finally did it.  But then again, other than changing oil, I have been under the hood in a very long time either.  That means it was done.
 
But the trunks not. (http://www.moparfins.com/forum/smileys/smiley9.gif)
Title: Theory question to become reality
Post by: Steve on March 12, 2009, 01:12:37 PM
Quote from: ardog
I didn't think there was that much difference in the HP between the two.
 
Well there isn't much.  Remember, it's still 40 more cubes bigger.
 
According to the software I got, (Thanks Stan) if I use what I already have on the motor, and the right cam, I can easily get it over the 300 HP range.
 
Since there is practically no difference in the exhaust valves, I see no problem reusing my heads.  Maybe a little bit of porting.  I have headers on it, the right exhaust system and the Hughes Air Gap intake.  The only other thing I can do is go to a 4 Barrel air intake vs. the 500 CFM 2 Barrel.  It looks like all I need to do is build a block and choose a different cam.  I could probably get close to 300 out of this motor.  But as said, many times, "There is no replacement for displacement"