are hooker sidepipes right for me
Thread Starter
Instructor
Joined: Jan 2006
Posts: 228
Likes: 1
From: Warwick New York
are hooker sidepipes right for me
I am building an 470 horse small block 400. I am thinking of putting 1 3/4 hooker headers with sidepipes with the small block 2 1/2 to 4 mufflers. Any body out there have any input.
Race Director
Joined: Apr 2000
Posts: 17,676
Likes: 201
From: Who says "Nothing is impossible" ? I've been doing nothing for years.
Thread Starter
Instructor
Joined: Jan 2006
Posts: 228
Likes: 1
From: Warwick New York
i was just looking on summit and i thought i found hooker headers sidepipes with 1 3/4 primary tubes. I thought they would be better for me then 1 7/8s but I went back and checked and i was wrong there was only 1 7/8. is that too much primary for my engine/
Last edited by captl27; Feb 20, 2009 at 10:55 PM.
Le Mans Master
Joined: Apr 2007
Posts: 7,353
Likes: 72
From: Graceland in a Not Correctly Restored Stingray
Keep in mind that the extra length of the sidemount primaries (46") somewhat offsets the effects of larger diameter. If you're looking to precisely locate peak torque you may need to contact someone like Stahl, but the Hookers work out for a good many of us. As it is, the BB version (2.125" x 45" primaries) projects to put my next 427's peak right where I want it, but I doubt I'd go with any other pipes anyway.
TSW
TSW
Le Mans Master
Joined: Apr 2007
Posts: 7,353
Likes: 72
From: Graceland in a Not Correctly Restored Stingray
Here's a primer on how headers effect torque as good as any you'll likely find short of an engineering text. I've seen other more complex formula for deducing theoretical peak torque RPM in which velocity isn't a fixed value nor many variables assumed/dismissed, but the basic equation illustrated within this article should suffice for all but the most precision of work.
http://www.carcraft.com/techarticles...ics/index.html
More difficult than estimating the peak torque RPM is to quantify how the body of the curve is effected above and below the peak torque RPM by primary volume. As this requires a plethora of variables be taken into account, IMHO one is better off getting Desktop Dyno or better (read, "expensive") simulation software rather than daring to attempt such with pencil and paper.
TSW
edit - Just to note, I ran the CarCraft formula on my 427 combo and found it varied somewhat high from results yielded thru Engine Analyzer Pro sims. There are more involved formula I've played with a bit that were pretty close to EA Pro's projections, and I'll post up if I find one of them that's readily translated.
http://www.carcraft.com/techarticles...ics/index.html
More difficult than estimating the peak torque RPM is to quantify how the body of the curve is effected above and below the peak torque RPM by primary volume. As this requires a plethora of variables be taken into account, IMHO one is better off getting Desktop Dyno or better (read, "expensive") simulation software rather than daring to attempt such with pencil and paper.
TSW
edit - Just to note, I ran the CarCraft formula on my 427 combo and found it varied somewhat high from results yielded thru Engine Analyzer Pro sims. There are more involved formula I've played with a bit that were pretty close to EA Pro's projections, and I'll post up if I find one of them that's readily translated.
Last edited by TheSkunkWorks; Feb 21, 2009 at 10:44 PM.
Thread Starter
Instructor
Joined: Jan 2006
Posts: 228
Likes: 1
From: Warwick New York
so you (the article) is telling me that normally the 1 7/8 primary is big for my engine but since the primary tube is extra long this make the hooker header more compatable with my engine.
Le Mans Master
Joined: Apr 2007
Posts: 7,353
Likes: 72
From: Graceland in a Not Correctly Restored Stingray
Basically, bigger diameter primaries mean higher peak torque RPM, but longer primaries mean more area under the torque curve below the peak and less above it. Consider diameter as more or less the fulcrum of the torque curve and the length as tipping the curve one way or the other on that fulcrum.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Thread Starter
Instructor
Joined: Jan 2006
Posts: 228
Likes: 1
From: Warwick New York
Thanks for the help I have been reading some of the other threads and most guys that have them seem to say they work for them or at least they did not do any harm.
Last edited by captl27; Feb 22, 2009 at 08:12 AM.
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
They look right, they sound right, they perform very well, what's not to like? Im using them with Max Flow inserts on my 500 HP 383.
Check here:
http://forums.corvetteforum.com/c3-t...-carlisle.html
Check here:
http://forums.corvetteforum.com/c3-t...-carlisle.html
Race Director
Joined: Jun 2000
Posts: 10,046
Likes: 675
From: FL
I like them a lot. I don't have a back to back comparison since I had the motor rebuilt and swapped to a slightly smaller roller cam when I installed the sidepipes.
Car still pulls hard, can smoke them off the line (3.27 first in the Tremec), and sounds great with STS baffles. Honestly, I can cruise with the radio on and they are not even too loud unless I floor it.
I just see them as an excuse to build a bigger motor. Decision is just whether I go for a budget (realtively) 383 build or a 400 based on the new Dart block. Decisions, decisions.
Car still pulls hard, can smoke them off the line (3.27 first in the Tremec), and sounds great with STS baffles. Honestly, I can cruise with the radio on and they are not even too loud unless I floor it.
I just see them as an excuse to build a bigger motor. Decision is just whether I go for a budget (realtively) 383 build or a 400 based on the new Dart block. Decisions, decisions.
