06-30-2015 | #61 | |
Join Date: May 2007
Location: Westminster, Maryland
Posts: 3,689
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Re: LT5 Cooling and Radiators
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I believe that a stock C4/LT5 with a stock radiator and fans that has no debris in the air flow path will operate in the normal temperature range. If you make any modifications that increase power, you will have to modify the cooling capability to keep up. Or, as a minimum you will have to ensure that the air flow through the radiator is not reduced by debris. Jim Last edited by QB93Z; 06-30-2015 at 09:29 AM. |
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06-30-2015 | #62 |
Join Date: Aug 2009
Location: South Dakota/California
Posts: 3,797
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Re: LT5 Cooling and Radiators
Here in Central Valley CA predicted 107 deg today with 100 deg every day through July 14 (then 109 deg on July 15). Will get lots of Engine Coolant System Testing done using Ron Davis Radiators next couple weeks in what I would call extreme Ambient Temperatures
Got Engine Coolant temperatures up to 220 deg F yesterday in 100 deg ambient racing around (No Traffic) and in traffic (idling in traffic and 100 mph on Test Road) and at higher rpms without paying attention to what I call (conservation of Engine Coolant Temperatures). Engine Coolant Temperatures quickly dropped over 15 deg once I collected myself and this with AC Full On (fan speed 10). The Engine Coolant Temperatures actually dropped a bit just idling in traffic after I was done fooling around You may think 220 deg F is HOT but in a Stock Radiator Fan System, the Radiator Fans would not even come on yet (My Radiator Fans were ON with Haibeck Chip and 180 deg Thermostat) If you are NOT looking at Digital Engine Coolant Temperatures using the HVAC System, the Temperature Gauge needle is a tad under half or at half at Engine Coolant Temperatures around 200 deg F and a tad over half at Engine Coolant Temperatures around 220 deg F. Each Engine Coolant Temperature Gauge will be just a tad different. HVAC Display Digital Engine Coolant Temperatures in Deg C....... Push/hold up and down buttons each side of Fan Speed Center Button until you get 00. Then push Fan Speed Control Button UP to right of Fan Speed Center Button until you get to 16. Then Push Center Fan Speed Button to Read Engine Coolant Temperatures in Deg C. Approximate C to F 85 C is 185 F 93 C is 200 F 100 C is 212 F 104 C is 220 F 110 C is 230 F 120 C HOT.....do not operate at 250 deg F (TURN AC OFF). Also...no one has mentioned except HIB (who uses water coolant and a water wetter only) that if you do not use antifreeze mixture your coolant System could boil over at 212 deg F (a bit higher Engine Coolant Temperatures with a good radiator cap which maintains 15 psi Coolant Pressures). NOT GOOD In regard to Loosing Coolant vice Heating Coolant to HOT temperatures. It has been said that as long as you do not loose the Coolant and the Water Pump is NOT Airlocked (like concern for low oil level in oil pan but as long as you have oil pressure) you will NOT destroy the LT5 Engine
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Left Clickable links -Solutions- LT5 Modifications/Rebuild Tricks Low Mileage ZR-1 Restoration 1990 Corvette (L98) Modifications LT5 Eliminated Systems LT5 Added Systems LT5/ZR-1 Fluids 1995 LT5 SPECIFIC TOP END REBUILD TRICKS Last edited by Dynomite; 06-30-2015 at 11:10 AM. |
06-30-2015 | #63 | |
Join Date: Aug 2014
Location: Kansas City, MO
Posts: 838
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Re: LT5 Cooling and Radiators
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Looking for a ZR-1 1985 Yamaha RZ350-NOT STOCK 1971 Yamaha AT1-Middle of a restoration |
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07-04-2015 | #64 | |
Join Date: Aug 2009
Location: South Dakota/California
Posts: 3,797
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Re: LT5 Cooling and Radiators
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Regarding Thermostats........Just as a comparison, I have checked several Stock Thermostats which ALL seem to open at 170 deg F as compared with Marc Haibeck's and Jerry's 180 deg F Thermostats which open AT 180 deg F. Some run 160/165 deg F Thermostats which once the Thermostat is fully open would not make a difference on the stabilized Coolant Temperatures no matter which Thermostat you used (A Cooler Thermostat would make a difference on how fast you get to that stabilized Coolant Temperature). This assumes the Full Open Thermostats are all of the same Coolant Flow Restriction/Flow Rate. Jerry has the special rubber thermostat gaskets sold separately in case the thermostat gasket gets messed up during installation of thermostat. I think we need more experiments with Radiator Cooling fan flow rates. We all have experienced trash blocking the radiators and the higher Coolant Temperature Results. We all have also experienced the effects of vehicle cruise speed on Engine Coolant Temperatures as compared to Engine Coolant Temperatures idling in traffic.
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Left Clickable links -Solutions- LT5 Modifications/Rebuild Tricks Low Mileage ZR-1 Restoration 1990 Corvette (L98) Modifications LT5 Eliminated Systems LT5 Added Systems LT5/ZR-1 Fluids 1995 LT5 SPECIFIC TOP END REBUILD TRICKS Last edited by Dynomite; 07-04-2015 at 03:08 PM. |
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07-06-2015 | #65 |
Join Date: Aug 2012
Location: Ellicott City, MD
Posts: 1,704
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Re: LT5 Cooling and Radiators
23 years of sucking up debris into the stock radiator. Replaced it with a DeWitt, Jerry's hoses and new 180 degree thermostat and should be good for another 23 years.
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Charlie __________ Dredgeguy WAZOO Member 1992 Bright Red/Black ZR1 #246 Dana 4:10 gears Polished LT5 by Haibeck Polished Fikse FM5's with Michelin Pilot Sport 2 Stainless Works headers and cats with Corsa |
07-07-2015 | #66 |
Join Date: Mar 2004
Location: Found Member
Posts: 4,346
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Re: LT5 Cooling and Radiators
Did you do the 3 1/8 inch holes in the thermostat mod ?
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Frank Urbo. NCM Lifetime member # 982 Registry Founding # 237 |
07-07-2015 | #67 |
Join Date: Aug 2012
Location: Ellicott City, MD
Posts: 1,704
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Re: LT5 Cooling and Radiators
Lots of discussions about it and went back and forth on this issue. Ended up doing a single 1/8 inch hole
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Charlie __________ Dredgeguy WAZOO Member 1992 Bright Red/Black ZR1 #246 Dana 4:10 gears Polished LT5 by Haibeck Polished Fikse FM5's with Michelin Pilot Sport 2 Stainless Works headers and cats with Corsa |
07-07-2015 | #68 | |
Join Date: Apr 2007
Location: Lake Bluff, IL
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Re: LT5 Cooling and Radiators
Quote:
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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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07-07-2015 | #69 |
Join Date: Aug 2006
Location: McLean, VA
Posts: 3,721
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Re: LT5 Cooling and Radiators
Frank,
I tried 3 1/8" holes 2 years ago. During the winter coolant temp refused to go above 153 degrees F. I was concerned with inability to boil off water build up in oil. Went to one 1/8" hole and recommended the same to Charlie. |
07-07-2015 | #70 |
Join Date: Mar 2004
Location: Found Member
Posts: 4,346
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Re: LT5 Cooling and Radiators
Interesting , 153 degrees F is no good for a winter driver. What degree thermostat did you use to get up to 153 f ?
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Frank Urbo. NCM Lifetime member # 982 Registry Founding # 237 |
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