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#1 |
![]() Join Date: Sep 2010
Location: Currituck, NC
Posts: 246
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I've been chasing my bubbies heater problem in his 93. Last option was to pull the thermostat and check the feed line to the core. BINGO...it was clogged!
Now here's the strange part: the thermostat has two bypass springs and neither one is long enough to hold the disc in position. The one on the left is from my wifes 91 that I replaced years ago when I replaced the water pump. The one on the right is from his 93. Wondering if anyone else has seen anything like this? Could it be some sort of test part associated with the cars original history? The car was an early 93 production (#17) that went to a test engineer and has emissions exempt decals under the hood along with coolant temps written with grease pencil on the surge tank.
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:cheers: [B][COLOR="seagreen"]Shrek[/COLOR][/B] [SIGPIC][/SIGPIC] |
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#2 |
![]() Join Date: Sep 2010
Location: Currituck, NC
Posts: 246
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:cheers: [B][COLOR="seagreen"]Shrek[/COLOR][/B] [SIGPIC][/SIGPIC] Last edited by Shrek; 09-23-2020 at 07:43 PM. |
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#3 |
![]() Join Date: Sep 2010
Location: Currituck, NC
Posts: 246
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I spoke with Marc H. a few days ago about this double bypass spring and he couldn't recall ever seeing any others like it.
Guess I'll label and put it on the shelf with my stash of used LT5 stuff. If anything It should make for good conversation when a bunch of us old guys are sitting around in the garage telling ZR-1 lies/stories. ![]()
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:cheers: [B][COLOR="seagreen"]Shrek[/COLOR][/B] [SIGPIC][/SIGPIC] |
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#4 |
![]() Join Date: Apr 2007
Location: Lake Bluff, IL
Posts: 2,065
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Yeah Shrek--here's what it will be like....Bob
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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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#5 |
![]() Join Date: Aug 2015
Location: Pittsburgh, PA
Posts: 152
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Haha, excellent, I actually did laugh out loud!
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Roger 1990 ZR-1 #2699 Black on Black 15,000 miles Full-time secondaries, 4.10 gears, C-beam plates, ported top end |
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#6 |
![]() Join Date: Sep 2008
Location: Mullica Hill, New Jersey
Posts: 2,578
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as did I.
Marty |
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#7 |
![]() Join Date: Jun 2005
Location: CenCoast California
Posts: 899
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Well...I'll be damned.
![]() Someone modified that 'stat with an extra spring to hold the bypass closed and force more flow through the radiator at higher RPM. Not a bad idea if the car has an all aluminum radiator but not such a good idea if it has a production radiator with crimped-on plastic side tanks. I had an all-aluminum, Fluidyne radiator in Barney when I owned it and I always wanted to reduce the amount of coolant which is bypassed at high RPM in the interest of reducing ECT at high-RPM/high-load. Rather than upping the bypass spring pressure on the thermostat, I was going to try restricting the bypass flow though the hose the actually bypasses coolant around the radiator. I was going to do this with a restrictor. I actually had obtained a Delrin rod of the right O.D. and was going to drill various sized, smaller holes in it and put that restrictor in the bypass hose. I was going to combine the restrictor with a slightly higher system pressure. But... like a lot of things, I never got around to doing it before I sold the car.
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Hib Halverson Technical Writer former owner 95 VIN 0140 current owner 19 VIN 1878 Last edited by Hib Halverson; 09-26-2020 at 08:32 PM. |
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