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#1 |
![]() Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Did a plenum for someone.....they went to 63mm TB so they asked me to open up the Plenum to TB and Air Horn.......
Besides moving to 63MM I went in and smoothed out the all the trasitions some ported and unported pics: Unported ![]() Ported ![]() Unported ![]() Ported ![]()
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 Last edited by LGAFF; 12-12-2011 at 09:54 PM. |
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#2 |
![]() ![]() Join Date: Feb 2010
Location: Pendleton, IN
Posts: 3,904
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LOTS OF WORK!
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1988 KOH Prototype EX5023 sold 1990 ZR-1 #444 Convertible 1990 ZR-1 Black #966 1991 ZR-1 Quazar Blue #296 1957 Duntov SS Project |
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#3 |
Join Date: Mar 2010
Location: Fort Worth, TX
Posts: 396
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Nice work Lee. How much does that run?
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#4 |
![]() Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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I threw it in with the port job....
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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#5 |
![]() Join Date: Dec 2004
Location: Jacksonville, FL USA
Posts: 4,645
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uoooooh smooooooth !
![]() nice flow ya got there mister! ![]()
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1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member |
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#6 |
![]() Join Date: Jan 2007
Location: Florida
Posts: 241
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Was that increase to 63mm just for the porting. I know Aaron Scott stopped putting 63m throttle bodies on his portings because the HP gain was near zero. Did I miss something here?
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#7 |
![]() Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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This person needed a rebuild due to an issue so he upgraded through someone......I just followed up on the request...its worth a few HP...smoothing should help...I was a skeptic, but a Mercury smoothing the airhorn actually showed a modst increase. They apparently had an engine on the dyno and did step by step mods for HP
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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#8 |
![]() Join Date: Feb 2011
Location: San Marcos CA
Posts: 1,802
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I kind of wonder at what hp level the 63mm throttle body is beneficial. I guess you might get a couple of hp from smoothing the sharp edges on a stocker- maybe, but I'd have to think you might benefit on a 500 hp engine more.
Has anybody done much testing on different combos? |
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#9 |
![]() ![]() Join Date: Jun 2005
Location: pittsburgh
Posts: 4,633
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i remember reading, maybe incorrectly, that the pirate car didn't have any gains from a 63mm tb
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It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B" |
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#10 |
![]() ![]() Join Date: Nov 2007
Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri
Posts: 6,493
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Transitioning the edges won't hurt, for sure. But, it seems to be quite abrupt still.
A topic for an FBI pizza night: I've been pondering something with a smoother and less abrupt transition; more in keeping with the 4% guideline (some use) for port transitioning. What I envision is more along the lines of a pair of internal funnel-like tubes. They would extend from the "big" ports and merge along a knife edge and morph to fill the shape of the horn at the inlet oval. Borrowing a term from another discipline, "impedance matching" is the goal: The less abrupt the change, the better for flow. OK, it isn't an original idea. If you get a chance to look into the rectangle inlet of a supersonic fighter e.g., an F-15 or the like, and you'll see what I'm talking about. My point is, "bumps" in the air stream, like rocks on the bottom of a shallow stream of water, cause pressure waves that extend way beyond the shape of the intrusion. Concept: ![]() I have no idea if it would be worth the trouble to build, but it might be something to experiment with. Just a thought. P.
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Good carz, good food, good friendz = the best of timez! 90 #1202 "FBI" top end ported & relieved Cam timing by "Pete the Greek" Sans secondaries Chip & dyno tuning by Haibeck Automotive SW headers, X-pipe, MF muffs Former Secretary, ZR-1 Net Registry Last edited by Paul Workman; 12-14-2011 at 06:37 AM. |
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