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#21 | |
![]() Join Date: Apr 2007
Location: Lake Bluff, IL
Posts: 2,067
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2016 Long Beach Red Z06 #10281 "POPS Z" 1995 Polo Green #409 "WARP TEN"--Haibeck 350/510 package, 4.10s, Hurst, Stock Exhaust with QTP Cutouts --Sold but still running strong 1993 Quasar Blue #161 "HIL KING" --Sold but still running strong, now with more than 120,000 miles 1967 Marlboro Maroon/Saddle Corvette Coupe 300 hp/4-spd --Sold a long time ago ZR-1 Net Registry Founding Member #95 NCM Lifetime Member Favorite Quote--Attributed to Mickey Thompson: "Too Much Horsepower is Almost Enough" |
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#22 |
Join Date: Nov 2018
Location: Washington
Posts: 98
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This is how I keep my secondaries open at all times after removing the vacuum actuators.
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#23 | |
![]() ![]() Join Date: Nov 2007
Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri
Posts: 6,493
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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 |
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#24 |
Join Date: Nov 2018
Location: Washington
Posts: 98
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I used a 1/4'' threaded rod and flattened one end using a hammer then drilled a hole in it for the linkage pin to slip into. Loctite on the inboard nut might be a good idea. I used a nylon lock nut on the outside.
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#25 |
![]() Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,152
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I like your solution and either locktite or a hole to pint he outer nut from backing off (like the crown nut setup for hubs (crowned nut is not really needed but the pin idea would work well)
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
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#26 |
![]() ![]() Join Date: Nov 2007
Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri
Posts: 6,493
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The obvious advantage to doing what you have done (used a modified bolt to hold the SPTs open) or a zip-tie as many have done, is the ease at which it can be reversed at a later date.
However, maybe for the sake of discussion, in my research on laminar flow and reversion caused by obstructions, I opted to remove the SPTs and the throttle rod entirely and plug the (now) empty bearing recess with a (Dorman) freeze plug. Admittedly, I have no "before and after" data to document the improvement to be had by so doing - that and extending the tapering of the IH runner down to the injector boss - but intuitively I feel it helps (just like smoothing the outside radius of the curves in the intake runner has in the porting fundamentals). But, increasing the porting modification beyond 36mm (in one fashion or another) has been shown to be beneficial to many of the porting schemes (including mine which are now @ 37.5mm).
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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; 06-22-2020 at 12:52 PM. Reason: error |
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#27 | |
![]() Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,152
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
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#28 | |
![]() ![]() Join Date: Nov 2007
Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri
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Note of interest: Someone correct me if I'm wrong, but I believe this gen-III motor was (IIRC) installed in a car owned by Graham Behan (former engineer for Lotus and Lingenfelter before going out on his own).
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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; 06-23-2020 at 06:17 AM. |
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#29 |
![]() Join Date: Feb 2013
Location: New Concord Kentucky
Posts: 179
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Paul, et al
Engine made 528 hp Ken owns the car that this engine was installed in. I will put more info on the fb page, including video Graham |
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#30 | |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,697
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Graham, what cams did u use for this?
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
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