HP repop manifolds
#347799
06/15/09 12:05 PM
06/15/09 12:05 PM
|
Joined: Jun 2006
Posts: 12,066 (Central) PA
Runner2go
OP
I Live Here
|
OP
I Live Here
Joined: Jun 2006
Posts: 12,066
(Central) PA
|
Maybe this should go in Q&A... But since it's a Restoration item, and most of the resellers lurk here... I'll start here. My question is this... (based on what FAST guys are doing with them) Are all of the current Repo HP Manifolds "Exact" reproductions internally? Here is why I ask... I have spent years in the boating world, where cast iron exhaust manifolds are the norm. However over the years several aftermarket companies, like GLM, began to manufacture improved replacements These replacements incorporated internal casting changes that were far superior to the original designs, yet looked exactly the same externally. (Some even cast them in Aluminum) Eventually the original manufacturers also implemented the same internal changes allowing for improved exhaust flow across the board. From what I've read, the FAST guys have figured out how to make the stock exhaust "Flow Better". So, my question is... Has anyone incorporated any of those "changes" into the internal casting of the new Repo HP Manifolds? If not, why not? I would think there would be a strong market for anything with improved flow, just like the marine counterparts. Just wondering. thx
1966 383, 4-sp Charger 38yrs 1970 440+6, 4-sp Road Runner 36yrs 1974 360, auto Challenger 25yrs,in Family 41yrs 2003 Ram 2500 QCLB 4x4 Cummins HO 2010 5.7L R/T 6sp Challenger - Mopar10 2018 392 Daytona Charger
|
|
|
Re: HP repop manifolds
[Re: Dave Watt]
#347806
06/15/09 10:03 PM
06/15/09 10:03 PM
|
Joined: May 2005
Posts: 6,446 NJ-USA
HPMike
master
|
master
Joined: May 2005
Posts: 6,446
NJ-USA
|
Quote:
One of the top FAST racers claimed there was very little HP gain from Extrude Honed exhaust manifolds.
Dave
Shhhh! They are a sponsor!
MB
|
|
|
Re: HP repop manifolds
[Re: HPMike]
#347810
06/16/09 12:19 PM
06/16/09 12:19 PM
|
Joined: Apr 2005
Posts: 15,134 Kelowna, B.C. Canada
DPelletier
I Live Here
|
I Live Here
Joined: Apr 2005
Posts: 15,134
Kelowna, B.C. Canada
|
Quote:
Just finished this build.
Stock untouched manifolds. "Mild" FAST build.
596 HP. 607 lb/ft trq.
Point is EH is a surface preparation. It does nothing in the way of "hogging out". Little of the parent metal is removed. And after a short time of run in, the manifold gets a coating of surface rust and carbon buildup, so any gains in surface prep quickly vanish. Then add to that fact that you still need to run it through a stcck type 2.5" exhaust system. Better than nothing. perhaps, but don't expect much.,,,
Well said (and nice work BTW ). Everyone I've talked to said the exact same thing. Of course I'm doing a Pure Stock build so it isn't allowed anyway.
There are relatively HUGE differences in the rest of the exhaust system, though. The difference between the factory 2 1/4 compression bent pipes vs. a high quality 2 1/2 inch mandrel bent system is huge compared to extrude honing the manifolds. Then there are the mufflers............
Dave
1970 Super Bee 440 Six Pack
1974 'Cuda
2008 Ram 3500 Diesel
2006 Ram 3500 Diesel
2004.5 Ram 2500 Diesel
2003 Ram 3500 Diesel
2006 Durango Limited
[url] http://1970superbee.piczo.com [/url]
|
|
|
|
|