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Old 09-23-2018, 10:40 PM   #1
2turbotoys
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Default 240 LS swap cooling system thread

Since we have a LS swap suspension thread, I thought it would be helpful (at least to me haha) to have a cooling system one. I've seen some minor info but not many specifics, overall sizes, overflow bottles, fans, what are ya running? What did it take to get the radiator in there? I don't mean simple brackets, was there a sawzall or cutting wheel involved? What didn't work?
Anyone using an electric waterpump? What GPM are you running, are there turbos involved?
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Old 09-24-2018, 10:56 PM   #2
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Guess this idea went over like a loud, very wet fart in an elevator. So here's what I've found so far.
Radiator:
Corvette C4 (84 to 89) radiators fit as far as height, use 3 row core
Custom built unit
940T radiator, is this really good for 450+ hp? When does it become a problem?
Electric water pump:
Nothing at all
Turbo involved? :
Who knows? Have to track down build threads that may not exist,..backtrack thru hours of other threads and get nowhere
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Old 09-24-2018, 11:17 PM   #3
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Use the radiator that sean is using
http://forums.turbobricks.com/showth...=341261&page=8
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Old 09-25-2018, 08:47 AM   #4
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Quote:
Originally Posted by 2turbotoys View Post
Guess this idea went over like a loud, very wet fart in an elevator. So here's what I've found so far.
Radiator:
Corvette C4 (84 to 89) radiators fit as far as height, use 3 row core
Custom built unit
940T radiator, is this really good for 450+ hp? When does it become a problem?
Electric water pump:
Nothing at all
Turbo involved? :
Who knows? Have to track down build threads that may not exist,..backtrack thru hours of other threads and get nowhere
I can confirm that the 84-89 C4 rad fits almost perfectly. Even the stock Spectra Premium replacement rad is 1.25" thick (single core), which is the same as the stock 240 small rad. It fits perfectly between the frame rails, with just about an inch of wiggle room. Height-wise, it sits a bit lower, but is still level with the top of the core support. I recently installed one in my 240 for the i6 whiteblock swap, and it's a great fit.
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Old 09-25-2018, 09:12 AM   #5
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I haven't gotten to this point on my swap yet, so nothing to offer. Just glad to see the discussion and learn from it.
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Old 09-25-2018, 09:13 AM   #6
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using a Champion dual core rad from a C4 Vette (bought at Jegs)
Flex-a-lite dual pusher fans mount perfectly to rad
waterpump is a moded (truck) waterpump from a 5.3
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Old 09-25-2018, 11:08 PM   #7
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Im running a stock 940 fan in my 240 in texas summer heat. Works great
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Old 09-26-2018, 12:06 AM   #8
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I've been running the c4 eBay rad for almost 2 years now with a hacked up 940 efan. No issues, drive the car and abuse it just about every day
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Old 09-26-2018, 05:48 PM   #9
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Stock 92+ 940NA here as well. Used a thin Spal fan hacked into the stock radiator shroud, to achieve clearance from the intake elbow and truck-depth accessories. Cools sufficiently for autocross-run-length events. Also, I can confirm the weird behavior in freezing temperatures without a heater line bypass (either hacked together from T fittings, or fancy like a LOJ conversions piece).
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Old 09-26-2018, 06:01 PM   #10
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Too bad I scrapped a perfectly good 940 radiator last month haha. I am getting rid of that huge accessory bracket and just running the alternator on a relocation bracket.
I really like the look of Seans radiator location....might go that route.
Hackster: "Northern 209620. It will have their dual fans and shrouds on it as well. Z40081" to save some searching for people, but that thread...dam, worth every second looking through it.
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Old 09-26-2018, 06:39 PM   #11
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I got a ~$100 radiator from summit for mine, it's a big ol nasty unit from Northern. Only qualm is it has a pinhole in it in the core.. I didn't check that before I did the modz to make it drop in...
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Old 09-26-2018, 09:13 PM   #12
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We have to pressure test brand new radiators?!? I'm sure there was no swearing involved haha
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Old 09-26-2018, 09:21 PM   #13
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you don't have to. I'm just ignoring it, it's not bad enough to cause problems, just annoying.
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Old 09-26-2018, 10:25 PM   #14
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Im using the 940 e fan also. I think the highest temp I see 204º with my lm7. They usually run around 209-210 in the trucks.
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Old 09-26-2018, 10:34 PM   #15
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I have a bunch of 940 fans, the radiator surface area is more important I guess, on a hot 85+ degree day my stock 242 engine is hitting 210+ with 940 fan with a 740T shroud, and thats with a gutted thermostat. Just an FYI for those that read this later, searching for C4 Corvette radiators on sites like Summit or Jegs triples or more the price of a universal radiator. Dimensional searches seem to make it a lot cheaper.
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Old 09-26-2018, 10:36 PM   #16
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Quote:
Originally Posted by 2turbotoys View Post
I have a bunch of 940 fans, the radiator surface area is more important I guess, on a hot 85+ degree day my stock 242 engine is hitting 210+ with 940 fan with a 740T shroud, and thats with a gutted thermostat. Just an FYI for those that read this later, searching for C4 Corvette radiators on sites like Summit or Jegs triples or more the price of a universal radiator. Dimensional searches seem to make it a lot cheaper.
I think your problem is the gutted thermostat. You need to slow that coolant down to cool it.
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Old 09-26-2018, 10:41 PM   #17
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yeah, run a thermostat. I dropped mine to a 180 from the stock like 205 or whatever, with the a/c on (when it works) towing things get a little warm, but that's about it.
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Old 09-26-2018, 10:43 PM   #18
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I thought that, no dwell time in radiator. The reason thats in there is I couldnt figure out why it was overheating, and so I fired both barrels of the parts shotgun. New waterpump, thermostat, radiator, temp sensor, nothing worked...till I put an Autometer temp gauge in and the entire problem was a bad gauge cluster. It never was overheating. That's the very condensed version... sorry thats off topic.
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Old 09-26-2018, 10:58 PM   #19
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ah. I get my data from the ecu, I don't even know if the dash is hooked up. wait, no, it's not. I probably should hook that up sometime.
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Old 09-26-2018, 11:15 PM   #20
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Haha, probably. My '79 doesn't have an ecu supplying me with data yet
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Old 09-26-2018, 11:39 PM   #21
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Quote:
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ah. I get my data from the ecu, I don't even know if the dash is hooked up. wait, no, it's not. I probably should hook that up sometime.
I'll go off the ecu from time to time. Its probably time to check for engine codes.
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Old 09-26-2018, 11:58 PM   #22
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I run the lingenfelter 165 thermostat and my car sits at about 190 all the time regardless of weather or traffic. If I hammer it for a long time it sometimes will hit 210 on the gauge. But logs have never shown much over 200
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Old 09-27-2018, 08:51 AM   #23
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Running into temp issues with the LS- my fans have no shroud. I vacuum-filled to purge air, still goes to 210 while idling.of course this was in 100* ambient temps.This is with NOS 240 diesel radiator. I have clearance issues with single 940 fan, so I am running twin 12” Mishimoto fans. I am installing a 160* thermostat and want to get some kind of shroud. Maybe fans with more cfm.
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Old 09-27-2018, 10:10 AM   #24
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Sorry to tell you this. But those damn mishimoto fans are completely junk, they do not flow near the cfm the advertise. Also they draw only about 5-7amps running. I had 2 on my Hilux with the b21ft and it would over heat so bad in traffic. Switched over to a derale fan and never had a issue again
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Old 09-27-2018, 11:24 AM   #25
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Yeah, I've learned the hard way that mishimoto/chinabay fans aren't worth the effort. One GOOD fan, from a reputable business, will keep temps down better than two cheap clones.
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