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#11 |
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Join Date: Apr 2017
Location: Tampa, Florida
Posts: 95
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#12 |
Join Date: Feb 2016
Location: Carterville Illinois
Posts: 846
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I maybe wrong, isn't the LT5 the only engine before or since that was ever outsourced by GM? I could see that as a reason...
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#13 | |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,696
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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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#14 |
![]() ![]() Join Date: Jun 2005
Location: pittsburgh
Posts: 4,633
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because the lt5 was designed mostly by lotus and built by meccruiser
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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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#15 |
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Join Date: Apr 2017
Location: Tampa, Florida
Posts: 95
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I understand but why did GM out source the LT5? Why didn't GM or Chevy build the LT5 in Michigan or wherever they were building GM motors for other Chevy cars like the Camaro, Firebird, Monte Carlo, etc?
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#16 |
![]() ![]() Join Date: Jun 2005
Location: pittsburgh
Posts: 4,633
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because they didn't know how to build a high rpm 4 cam engine. they wanted to try and slap 4 cam heads on an l98 and that didn't work.
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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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#17 |
![]() Join Date: Feb 2012
Location: Ledyard,CT
Posts: 8,118
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They had four cam race engines in the 1960's!
Last edited by BigJohn; 09-19-2017 at 06:52 AM. |
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#18 |
![]() Join Date: Nov 2011
Location: Dunbarton NH
Posts: 7,361
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I also understand there would be too few of them for GM to set up shop.
Plus, who knew aluminum engines better than Mercruiser. |
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#19 | |
![]() ![]() Join Date: Nov 2007
Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri
Posts: 6,493
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MM was very successful building all-aluminum engines that were designed to run for extended periods at WOT. Initially, MM already had the manufacturing technical advances unique to precision manufacturing of aluminum engines as well as the trained personnel with the expertise to build these special motors to the extreme tolerances these motors would demand - already in place,. It was a good fit...and the "REST IS HISTORY". An important footnote to the LT5 was the DOHC V8 developed by Oldsmobile which appeared as the Northstar in the Cadillac and variants of it continued to the Aurora as the L47 V8s. These 4-cam, DOHV motors were expensive to build and expensive to implement on a large scale. As result, GM reverted back to the cheaper and much improved OHV motors, (thanks to the development and lessons learned from the LT5) for all of their gasoline V8 vehicle applications.
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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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#20 |
Join Date: Oct 2015
Location: Toronto
Posts: 545
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Mike and I took our Z to a Corvette car show in Whitby, Ontario last Saturday. Surprisingly, another Z showed up but it was in really rough shape. We were able to park our car sideways so you had a good view of the LT5 as you walked up to it. We had a lot of admirers and talked to a lot of other Vette owners about the car. None of them had ever seen the LT5 before or the ZR-1 for that matter.
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