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06-27-2018, 09:19 PM | #1 |
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beating my head trying to figure this out please help
ok so here is the Situation i have a 350 SBC in my 65 c10 i have replaced the cooling system with as fallows a new radiator aluminum champion 2 row for the bigger 1 inch cooling tubes .. i have replaced the water pump with a new HV water pump . i have a new electric 3000 cfm fan and a shroud . i have a new Tstat 180 deg and T stat housing i also drilled a few holes in the Tstat flange in case of Tstat failure .. i have also checked all freeze plugs and replaced with brass ones . the fan is on a auto switch set up so as soon as it hits 180 it kicks on . done a leak down test checking for bad head gaskets all is good. new fuel pump n new filters new carb a Holley 600 vacuum secondary . new plugs and new wires .. so now you know all i have done . here is my issue if its a warm day sitting in traffic or driving in town im just fine she sits at just 190 to 195 .. BUT the moment i start any kind of incline no matter how small she gets to the 210 mark not happy with that not when im running a 180 Tstat but here is where it gets really weird remember i have a fan shroud . so lets say im on the incline its a slight one but on the freeway and im not slowing down im doing 65 the whole time she gets to 210 but then as soon as im at the top of the incline and start going down still the same speed she starts dropping her temp back to 190 - 195 so please guys what am i missing here ? what is causing this and how can i fix it ? i mean if it was the fan not being enough it would over heat on any driving and if it was the radiator ? then i would think the same any driving would cause this .. and at speeds on the freeway as long as im forcing that air into it climbing or not i would think she would not over heat ? so yeah please help me figure this out
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06-27-2018, 09:40 PM | #2 |
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Re: beating my head trying to figure this out please help
Is timing correct?
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06-27-2018, 09:45 PM | #3 |
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Re: beating my head trying to figure this out please help
12 initial and 30 full on timing
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06-28-2018, 08:45 AM | #4 |
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Re: beating my head trying to figure this out please help
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06-28-2018, 12:24 PM | #5 |
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Re: beating my head trying to figure this out please help
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06-28-2018, 01:11 PM | #6 | |
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Re: beating my head trying to figure this out please help
Quote:
If you likely haven’t adjusted the mechanical then your 12 initial with 30 all in suggests your initial is incorrect. Most distributors run near 24 degrees in mechanical. Depending on what rpm you set your timing at then you might have an actual 2 degrees initial or less. You didn’tsay What rpm you set initial at. BTW the crap gas we have now needs way more timing to burn right. |
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06-28-2018, 03:31 PM | #7 |
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Re: beating my head trying to figure this out please help
With more timing you will have a slightly cooler running engine. Check the depth of fan in the shroud. There is a spec something like half in and half out.
A 180 will have a variance in it. Its mechanical, not perfect. Flush your cooling system, including taking out the drain plugs in the block. You will be surprised at what comes out. Do not use tap water with your coolant. Use a recovery tank with 16 lb radiator cap. There are many other tricks also. |
06-28-2018, 06:11 PM | #8 | |
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Re: beating my head trying to figure this out please help
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06-27-2018, 09:49 PM | #9 |
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Re: beating my head trying to figure this out please help
Verify your temps with a 2nd source. Laser gauge, 2nd temp gauge, etc. Just because it has numbers doesn't mean it is accurate. Plus the gauges are not always consistent. It might be spot on at 180 and +10* at 210. I chased a 'bad tstat' for 3 tstats only to find out the sender would sometimes just read full scale hot even though the 2nd gauge I finally installed in the opposite head was reading normal.
Assuming the numbers are good, 210 is perfectly acceptable for a sbc 350. Its where they will normally run with a 195 tstat. The temps should go up a bit on an incline, more power needed = more gas burned. What happens on a long steep incline? Can you hear the fan come on while driving? |
06-28-2018, 12:50 AM | #10 | |
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Re: beating my head trying to figure this out please help
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06-27-2018, 10:01 PM | #11 | ||
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Re: beating my head trying to figure this out please help
Why the need for a HV water pump? Could be moving water faster than the system can cool it. Especially with a load on the engine.
Gary
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06-28-2018, 12:55 AM | #12 |
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Re: beating my head trying to figure this out please help
It was what I changed to from a stock pump trying to chase this problem so unfortunately in other words it did it with a factory style pump as well
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06-28-2018, 08:44 AM | #13 |
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Re: beating my head trying to figure this out please help
Add more initial timing.
I had the same issue. I'm more like 18-20 initial 36 total(mechanical), vacuum advance adjusted to just keep it from pinging. Carb could be a little lean, check the plugs. They are not perfect out of the box. Went back to factory AC water pump. The HV pump was doing more harm than good. A 165 thermostat will give you more temp room to play with. Also only use one vent hole 1/8" if there is not a check valve in it already. The water flow around the tstat affects its opening. Mine is one of the GM 290HP crate motors with eldebrock 600 carb. Added vortec heads, but heating problems started with originals.
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06-28-2018, 12:35 PM | #14 | |
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Re: beating my head trying to figure this out please help
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07-05-2018, 09:04 PM | #15 | |
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06-28-2018, 09:57 AM | #16 |
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Re: beating my head trying to figure this out please help
Where did you put the temp switch for the fan?
Keep in mind that the temp rating of a tstat is the temp they start to open. Normal operating temps should run 10~20* higher. If you have the fan switch in the tstat housing or in the radiator near the hot water inlet, would explain when your fan stays on as it will always see temps > 180 once things warm up. |
06-28-2018, 12:26 PM | #17 | |
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Re: beating my head trying to figure this out please help
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06-28-2018, 01:54 PM | #18 |
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Re: beating my head trying to figure this out please help
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06-28-2018, 02:40 PM | #19 | |
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06-28-2018, 06:44 PM | #20 |
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Re: beating my head trying to figure this out please help
210* isn't boiling/overheating even w/ water (don't use just water), and more w/ real coolant. 180* is when the 'stat open, and closes. It has nothing to do with things once the temp goes over 180.
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06-28-2018, 09:46 PM | #21 |
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Re: beating my head trying to figure this out please help
Going up an incline and the temp goes up? Where are your trans lines going? If they are in the radiator, I would add a trans cooler and take the lines out of the radiator. 210 is not hot if the engine maintains 210. A small block chevy makes its most hp at 210. My 6.2 Silverado runs 210 all the time.
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06-28-2018, 10:01 PM | #22 | |
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07-14-2018, 05:00 PM | #23 | |
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07-14-2018, 05:44 PM | #24 | |
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07-14-2018, 06:22 PM | #25 | |
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