5,2 Magnum... Plenum and other things to look out for.
#1306725
09/18/12 11:47 PM
09/18/12 11:47 PM
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Joined: Jan 2003
Posts: 12,043
State of Confusion
hp383
OP
Just a normal tag again
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OP
Just a normal tag again
Joined: Jan 2003
Posts: 12,043
State of Confusion
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I recently picked up a 92 Dakota with a 5.2 Magnum.
I know (vaguely) of the plenum issues, but not the best solution to repair.
What are the suggested parts to use on this, and do I fix it now before it goes bad, or if its lasted this long, no worries?
What other issues might these be know for? And best solutions to avoiding trouble?
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Re: 5,2 Magnum... Plenum and other things to look out for.
[Re: hp383]
#1306729
09/19/12 03:08 PM
09/19/12 03:08 PM
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Joined: Mar 2007
Posts: 3,277
West Coast, USA
jbc426
master
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master
Joined: Mar 2007
Posts: 3,277
West Coast, USA
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I'm working on freshening up a 2001, 90k mile 5.9 Magnum to replace the Slant 6 in my 1968 Barracuda convertible. I got a different cam, springs, retainers, valve seals and timing set from Hughes Engines; and replaced the rod bearings and front and rear main seals while it's on the stand. Eventually, I will put in a stroker kit and upgrade the heads and intake, but for now I picked up Hughes's plenum repair kit with all the gaskets hose etc. I gasket matched the intake ports in the heads and intake and modified the internal runners in the stock beerkeg manifold as done on by the guy in this link. Mine didn't have the center divider so it was quick and easy. http://dodgeforum.com/forum/2nd-gen-ram/145873-kegger-intake-mod-diy.htmlI'll have some more questions too for those who have tread this path before with the whole fuel injection hook-up and reflash along with the 45rh surgury/ swap etc. I blame Steve aka Autoxcuda (as seen here at Spring Fling a few years ago) for instigating this latest series of upgrades....He was just having too much fun with that car of his down at Mopar day at Willow Springs, which by the way , they are doing again this year before Fall Fling.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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Re: 5,2 Magnum... Plenum and other things to look out for.
[Re: jbc426]
#1306730
09/20/12 09:35 AM
09/20/12 09:35 AM
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Joined: Jan 2006
Posts: 8,162
USA
360view
Moparts resident spammer
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Moparts resident spammer
Joined: Jan 2006
Posts: 8,162
USA
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Quote:
http://dodgeforum.com/forum/2nd-gen-ram/145873-kegger-intake-mod-diy.html
I have long wondered if instead of cutting off some of the length of the stock beer barrel
A hole could be added part way down the runner instead.
The air would then decide
Which inlet to enter.
Don't laugh about
"the air deciding which path to take"
Because Ford engineers found that actually happened
And they eliminated an internal runner flap valve
That had been designed into their original intake manifold design.
The Magnum V8 total runner length
which combines
manifold runner
plus length of the cylinder head intake port up to the backside of the intake valve
is said by Long time Chrysler engineer
Willem Weertman
to be 18 inches,
And appears to resonate in the 3400 to 3600 rpm range
Which makes sense
If you look at the 1992 Magnum 5.2 rpms of max torque and max horsepower.
http://www.amazon.com/Chrysler-Engines-1922-1998-Willem-Weertman/dp/0768016428
I quote the
18 inches by Weertman
Because it is hard to know how to measure it yourself
... Do you measure
the top, middle or bottom
of the quite rectangular runner passage as it makes its arching path?
A Magnum being set up for acceleration
Needs resonation in the 4600 to 5000 rpm range
With header lengths to match.
The towing duty iron V10 had 25 inhes which allowed resonation at 1700 rpm.
My fuzzy memory is original 5.7 Hemi was
27 inches
but I dont know the current 2013 dual path lengths.
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Re: 5,2 Magnum... Plenum and other things to look out for.
[Re: 360view]
#1306732
09/20/12 11:01 AM
09/20/12 11:01 AM
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Joined: Mar 2007
Posts: 3,277
West Coast, USA
jbc426
master
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master
Joined: Mar 2007
Posts: 3,277
West Coast, USA
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Quote:
Quote:
http://dodgeforum.com/forum/2nd-gen-ram/145873-kegger-intake-mod-diy.html
I have long wondered if instead of cutting off some of the length of the stock beer barrel
A hole could be added part way down the runner instead.
The air would then decide
Which inlet to enter.
Don't laugh about
"the air deciding which path to take"
Because Ford engineers found that actually happened
And they eliminated an internal runner flap valve
That had been designed into their original intake manifold design.
The Magnum V8 total runner length
which combines
manifold runner
plus length of the cylinder head intake port up to the backside of the intake valve
is said by Long time Chrysler engineer
Willem Weertman
to be 18 inches,
And appears to resonate in the 3400 to 3600 rpm range
Which makes sense
If you look at the 1992 Magnum 5.2 rpms of max torque and max horsepower.
http://www.amazon.com/Chrysler-Engines-1922-1998-Willem-Weertman/dp/0768016428
I quote the
18 inches by Weertman
Because it is hard to know how to measure it yourself
... Do you measure
the top, middle or bottom
of the quite rectangular runner passage as it makes its arching path?
A Magnum being set up for acceleration
Needs resonation in the 4600 to 5000 rpm range
With header lengths to match.
The towing duty iron V10 had 25 inhes which allowed resonation at 1700 rpm.
My fuzzy memory is original 5.7 Hemi was
27 inches
but I dont know the current 2013 dual path lengths.
Kevin over at at Hughes was telling me they've done a lot of flow bench testing with the beer keg manifold in the past. They found that every inch removed from the runners raises the resonance peak about 200 rpm.
He told me gasket matching the the intake and head would probably give me a noticible power increase, more so than any other mods inside the manifold including cutting the runners back as shown in the link.
Regarding cutting another opening to the port. It may work, who knows, but it seems like it would interupt the flow and reduce the velocity of the exsisting air flow in the port causing turbulence and slower flow.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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Re: 5,2 Magnum... Plenum and other things to look out for.
[Re: coronet1966d]
#1306734
09/20/12 06:09 PM
09/20/12 06:09 PM
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Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
70Cuda383
Too Many Posts
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Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
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Quote:
the only gains found on this intake are above 4000 RPM and if you have a dakota,ram,durango they redline at 5000-5500. 1500RPM of top end gains dont outweigh the torque losses down low. on one my dakota street driven the stock keg intake is alot more responsive not to mention the M1 costs a fortune
Ok. sure. an M1 all by itself, with no other mods, isn't really worth the cost of the intake. However, there isn't really any low end loss. when your motor makes more torque than the tires can hold, it doesn't matter if your making 300 ft lbs or 350 ft lbs...when the tires break loose, anything more is wasted in smoke.
regardless, look at my post--re-read it. I said "if you plan on making other mods, then start with the intake now"
**Photobucket sucks**
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Re: 5,2 Magnum... Plenum and other things to look out for.
[Re: 70Cuda383]
#1306736
09/21/12 08:34 AM
09/21/12 08:34 AM
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Joined: Aug 2003
Posts: 2,682
Clinton Twp. Michigan
coronet1966d
master
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master
Joined: Aug 2003
Posts: 2,682
Clinton Twp. Michigan
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Quote:
Quote:
the only gains found on this intake are above 4000 RPM and if you have a dakota,ram,durango they redline at 5000-5500. 1500RPM of top end gains dont outweigh the torque losses down low. on one my dakota street driven the stock keg intake is alot more responsive not to mention the M1 costs a fortune
Ok. sure. an M1 all by itself, with no other mods, isn't really worth the cost of the intake. However, there isn't really any low end loss. when your motor makes more torque than the tires can hold, it doesn't matter if your making 300 ft lbs or 350 ft lbs...when the tires break loose, anything more is wasted in smoke.
regardless, look at my post--re-read it. I said "if you plan on making other mods, then start with the intake now"
ive got an M1 for sale as soon as i take it off my truck 
hughes FI air gap 
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