Re: 2.25" Magnum Manifold Power Potential
[Re: GOT6PAK]
#2420622
12/18/17 09:34 PM
12/18/17 09:34 PM
|
Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
|
Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
|
I'm running em on the stock car. No idea on power output but they are shaped well & you have a pair of the early ('92/early '93) large outlet ones. there is a youtube vid on porting em out with acid & the gain was significant.
live every 24 hour block of time like it's your last day on earth
|
|
|
Re: 2.25" Magnum Manifold Power Potential
[Re: GOT6PAK]
#2420664
12/18/17 11:00 PM
12/18/17 11:00 PM
|
Joined: Jan 2005
Posts: 12,419 Kalispell Mt.
HotRodDave
I Live Here
|
I Live Here
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
|
I don't think its a matter of potential so much as it is an issue of how much are you losing over some decent headers. Even a stock 5.9 magnum shows huge gains (like 20hp)going from even the best manifolds to a TTI header.
You have the best manifolds but even they are not nearly as good at making power as headers. The more powerful the engine the bigger difference it will make.
If your asking what is the most power you can make with those restricting the engine I would say with enough cubes, cam, compression, good heads, carb, intake... you might be able to force 550hp thgough them. Of course that same engine is probably gonna make 650+ with decent headers.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
|
|
|
Re: 2.25" Magnum Manifold Power Potential
[Re: GOT6PAK]
#2420708
12/19/17 12:17 AM
12/19/17 12:17 AM
|
Joined: Oct 2003
Posts: 21,345 Marysville, O-H-I-O
70Cuda383
Too Many Posts
|
Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
|
I think 275-300 rwhp is about the limit you're gonna get with the magnum exhaust manifolds. I do know of a guy who did 430 rwhp, but that was with a LOT of spray.
as close of an apples to apples comparison between the 2, a Dakota with tuning and a performance intake, stock exhaust manifolds and a cat back system made 237 rwhp. same combo with mid-length spin-tech headers made 253 hp.
But, beyond that point, when one starts doing heads, cams, strokers, etc. the spin-techs really start to shine, or rather, highlight the restriction of the stock manifolds.
Of course, all this was on modern EFI Dakotas with Magnum heads too. The Magnum outflows most of the regular production LA heads out there.
**Photobucket sucks**
|
|
|
Re: 2.25" Magnum Manifold Power Potential
[Re: GOT6PAK]
#2420803
12/19/17 03:22 AM
12/19/17 03:22 AM
|
Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
|
Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
|
with more thought I ain't sure if it was magnum manis but I had kinda thought that but in any case it was regular iron & the soak time wasn't too long & what impressed me was the cross section area they gained. EDIT lookup "Acid Porting Cast Iron Manifolds" & the vid is 3 minutes & 18 seconds long to confirm you have the right one. they said 16% more volume & I tried to post the address but it would not take.
Last edited by RapidRobert; 12/19/17 03:52 AM.
live every 24 hour block of time like it's your last day on earth
|
|
|
Re: 2.25" Magnum Manifold Power Potential
[Re: poorboy]
#2420999
12/19/17 04:18 PM
12/19/17 04:18 PM
|
Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
|
Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
|
Gene that sounds like you might be able to answer a Q I have with that, they just changed the rules from 2.5" ex pipes to 2". how much power might that cost us? Iron manis. big magnum on dr side/68-70 340 HP on pass side (both have ~2&5/16 outlets).
live every 24 hour block of time like it's your last day on earth
|
|
|
Re: 2.25" Magnum Manifold Power Potential
[Re: GOT6PAK]
#2421049
12/19/17 05:42 PM
12/19/17 05:42 PM
|
Joined: Jan 2005
Posts: 12,419 Kalispell Mt.
HotRodDave
I Live Here
|
I Live Here
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
|
dogdays is right on, flow has a lot less to do with it than the pulse pull effect from headers. Heck you could run no exhaust after the port at all for the ultimate flow but it still wouldn't make the power that good headers would. This is why when that magazine article years ago compared all the manifold from 273 junk to 340 gold there was barely a difference in power from the best to worst but headers added about 25hp on a basically stock 5.9 magnum.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
|
|
|
Re: 2.25" Magnum Manifold Power Potential
[Re: GOT6PAK]
#2421245
12/20/17 12:38 AM
12/20/17 12:38 AM
|
Joined: Aug 2005
Posts: 6,003 Salem
Grizzly
Moparts Proctologist
|
Moparts Proctologist
Joined: Aug 2005
Posts: 6,003
Salem
|
" I just don't want to deal with headers so this is the route I want to go and want to build my motor to suite."
Can you clarify this point?
A truck has plenty of room to work in, I regularly see headers in the local classifieds for like 50 or 100 dollars, ground clearance is a non-issue, and matching up exhaust is easier.
I'm not understanding what is putting you off headers?
Mo' Farts
Moderated by "tbagger".
|
|
|
Re: 2.25" Magnum Manifold Power Potential
[Re: GOT6PAK]
#2421300
12/20/17 02:36 AM
12/20/17 02:36 AM
|
Joined: May 2004
Posts: 891 Southern California
GOT6PAK
OP
super stock
|
OP
super stock
Joined: May 2004
Posts: 891
Southern California
|
poorboy, that's great info. I've always wanted a stroker. I don't mind leaving a little HP on the table and not have to deal with header clearance and other issues. Can't wait to see the results.
dogdays, more great info. I didn't know that about pulse tuning. I agree there's no magic number, I think I was just looking at it the wrong way. I'll just see what I get when the combo goes together. I'm sure I'll be happy.
FurryStump, I'd be happy with 400HP at the flywheel, so I should be good lol!
360view, I thought that was weird too using the same side manifolds...Must have been some reason, I just don't know what.
jerseybud, I think that would be a neat comparison!
Grizzly, trucks seem like they have a ton of room, but not in the frame area. Drivers side you're fighting automatic shift linkage, trans kick down linkage and the frame. Manifolds eliminate all that plus I'll just about never have to touch them again. My truck is dropped about 5-6" and running 17's so it does sit low, another reason for more clearance.
|
|
|
Re: 2.25" Magnum Manifold Power Potential
[Re: GOT6PAK]
#2421347
12/20/17 09:06 AM
12/20/17 09:06 AM
|
Joined: Jan 2006
Posts: 8,162 USA
360view
Moparts resident spammer
|
Moparts resident spammer
Joined: Jan 2006
Posts: 8,162
USA
|
http://www.mazda.com/en/innovation/technology/skyactiv/skyactiv-g/Mazda says a Tr-Y header with the tube length down to the 2nd Y join of 600 mm (23.6 inches) has several benefits Back in 1994 Mike Leach made for Magnum 5.2/5.9 V8s TriY headers that Mopar Performance put their name on that had a combined tube length to the second Y close to this. How much does this help? In 2012 when Mazda could NOT fit this 4-2-1 header into the Mazda3 engine compartment space then available, but had the other SkyActiv changes on the engine, static compression ratio in the USA sold model was 12 to 1. In 2013 when they could fit the 4-2-1 header in, static compression ratio was raised to 13 to 1. Overseas where gasoline Octane rating of regular grade is higher than the USA AKI of 87, Mazda raises the static compression to 14 to 1
Last edited by 360view; 12/20/17 10:11 AM.
|
|
|
|
|