How hot does your car run idle & cruise? - Chevelle Tech
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post #1 of 48 (permalink) Old May 13th, 19, 12:24 AM Thread Starter
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Chris
 
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How hot does your car run idle & cruise?

I'm just tryin to get an idea of what is common place for engine temps. Perhaps following the same basic spec list, pics are welcome, and let us all know how hot or cold your engine runs.

Idle: If I let it sit, it'll keep climbing up to 217... maybe more.

Driving (cruise or hard): 176-183F

.030 over 454 BBC. Iron heads, aluminum intake. 280H cam, approx 9.5:1 CR.
unknown Aluminum Radiator
180F T-stat
Flex-fan with a shroud.
Weiand water pump
EFI set to 14.3-14.7 AFR @ idle
24 degrees timing at idle.

Not sure why mine doesn't cool very well at idle compared to at speed. Seems as if the fan just isn't pulling any air. But when moving, even with a flex fan there is plenty of air flow.

1971 Chevelle SS454, T56 Magnum 6 speed, 3.31 Posi

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post #2 of 48 (permalink) Old May 13th, 19, 12:34 AM
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I'm on mobile so bear with me...

185 thermostat--clutch fan 4 core radiator
(this is in 100 degree weather)
Driving (cruise or hard): 185-190*F
Idle: 195-205

489, aluminum intake. 250/256 cam, approx 10:1 CR.
Weiand aluminum water pump
EFI set to 13.9 AFR @ idle
950rpm idle
22 degrees timing at idle to 36.5 degrees total
10 degrees of vacuum.
Cruise afr is 14.9
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post #3 of 48 (permalink) Old May 13th, 19, 1:15 AM
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Marcus
 
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Re: How hot does your car run idle & cruise?

One importent thing comparing temps is if sender is in head or intake. The difference can be as much as 20 deg.

489 BBC
Brodix race rite 270 ovals
Comp hyd roller 242/[email protected] .621 .616 112 ls
Rpm airgap
Pro system 1000hp
Msd 8361 distributor

Alumitech radiator 2 1” rows.
Chinese white box waterpump.
Dual 11” spal fans. Upgraded wiring and a powermaster 140 amp alternator.

Driving/cruising 185-190 deg in the head.
Idle/standing still in traffic no matter of time even for hours in car show parades 175-180 deg in the head with both fans running(i use my overrun switch in those cinditions most of the time). This is with outside temps in the low 90’s if colder car runs little colder.

25 deg initial
35 total
+10 deg from vac advance ported vacuum, cant get steady timing with manifold vacuum.
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Chevelle Malibu ss 64
489 BB with parts from Lewis racing
Alumitech radiator with dual spals
Th 400 Edge 9.5" converter
57 3/4” wide 12 bolt: Eaton posi, Us gear 3.31, Toms KA 33 splines axles
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post #4 of 48 (permalink) Old May 13th, 19, 1:32 AM Thread Starter
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Chris
 
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Re: How hot does your car run idle & cruise?

Quote:
Originally Posted by Malibu ss 64 View Post
One importent thing comparing temps is if sender is in head or intake. The difference can be as much as 20 deg.
Excellent point. I am running temps at the intake manifold.

Your cooling is very impressive! What T-stat?

1971 Chevelle SS454, T56 Magnum 6 speed, 3.31 Posi

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post #5 of 48 (permalink) Old May 13th, 19, 1:47 AM
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Marcus
 
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Re: How hot does your car run idle & cruise?

Quote:
Originally Posted by -SS454- View Post
Excellent point. I am running temps at the intake manifold.

Your cooling is very impressive! What T-stat?
Milodon hi flow 160 deg.
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Chevelle Malibu ss 64
489 BB with parts from Lewis racing
Alumitech radiator with dual spals
Th 400 Edge 9.5" converter
57 3/4” wide 12 bolt: Eaton posi, Us gear 3.31, Toms KA 33 splines axles
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post #6 of 48 (permalink) Old May 13th, 19, 2:06 AM
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Good point. Mine is the intake as well

This is a mechanic Stewart warner gauge that is verified to be arrurate with a temp gun.
My edelbrock system reads about 10 degrees higher(it stays at a steady 208 in traffic usually 194 at cruise)
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post #7 of 48 (permalink) Old May 13th, 19, 2:29 AM
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Re: How hot does your car run idle & cruise?

190-205 electric fans, 396
185-200 fan switch


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post #8 of 48 (permalink) Old May 13th, 19, 6:50 AM
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Jeff
 
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Re: How hot does your car run idle & cruise?

1969 el Camino. Stock 454, th400 & 2:87.. Champion 2 row, 180 Stant T-stat with a 1/16 hole drilled into the base, stock clutch fan, no shroud.. Temps are, 180-190 highway, 180-190 city, in summer 90+ weather...

When I installed the Champion, I had to change the t-stat from 160 to 180, the 160 was too cold and the engine was slightly sluggish, the 180 woke it up..

The stock clutch fan can be adjusted, take the spring off and either wind up or unwind the stator in the fan.. I am going to back mine all the way off for better economy and performance..
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post #9 of 48 (permalink) Old May 13th, 19, 7:38 AM
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Re: How hot does your car run idle & cruise?

Chris,
If it runs 176-183 at speed then your overall cooling system is probably fine. Thats just about a perfect temp range. You are just not getting enough air flow at idle. What happens sitting still if you raise the rpm's some ? Have you tried a different fan ? I have never really liked flex fans. I would rather have a stock type fan with a clutch.

Bill Koustenis
Advanced Automotive Machine
Waldorf Md


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post #10 of 48 (permalink) Old May 13th, 19, 8:04 AM
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Re: How hot does your car run idle & cruise?

I run a 180* Stant Superstat, APDI/PRO 8010322 Radiator - single row, 1 1/4 core aluminum with plastic tanks + Flex-a-lite 1818 fan with no clutch or shroud. Temps at speed run 190ish and can climb to 220ish at extended idle in 100* weather. It will recover fast once the car starts moving. In cooler outside temps it stays closer to the thermostat rating.

Imho a lot of people have no clue about how the cooling systems work and worry too much about what the normal temp ranges these old engines operate at. They also put too much emphasis on what other clueless people post and the marketing hype from manufacturers advertisements.

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post #11 of 48 (permalink) Old May 13th, 19, 8:21 AM
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Rick
 
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Re: How hot does your car run idle & cruise?

467 cube, sender in head. Edlebrock pump, 160* thermostat with two 1/16 opposing holes in flange, bypass hose, 3 row copper radiator, 1971 shorud, flex fan. B&M trans cooler in front of radiator. Last weekend running 175* sitting or driving.
Some shrouds do not cover the entire radiator. Get one that does.
Seal the shroud with rubber home water pipe insulation anywhere you have a gap.
Fan needs to be placed partially inside and outside the shroud opening.


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post #12 of 48 (permalink) Old May 13th, 19, 8:22 AM
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Re: How hot does your car run idle & cruise?

I run Flex fans but they are Factory Ford flex fans.
Never any cooling issues at idle or high speed.
Most of my vehicles did NOT have a shroud but the fan was 1" away from the radiator.

Ones with a shroud had just about 1/2 of the blade inside the shroud.
If you put all the blade inside the shroud you will not pull as much air through the radiator.

I do not know how deep your fan is into the shroud.
I have used the thin shiny aftermarket flex fans and they did not work well at all.
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post #13 of 48 (permalink) Old May 13th, 19, 8:51 AM
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Re: How hot does your car run idle & cruise?

All depends on when I have the ecu turn the fan on full speed, I can pretty much control it from 160° to 210° all depends on where I want it, unless it's over 100° day, then it's where ever it ends up. When street driving I like to be 180° to 190°, it helps keep the moisture out of the oil. If I run it too cold, it puts more water in the oil and the oil doesn't get hot enough to evaporate it out fast enough.
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post #14 of 48 (permalink) Old May 13th, 19, 2:19 PM
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Re: How hot does your car run idle & cruise?

You probably need a new fan clutch. It's hard to tell if a clutch has gone completely bad. It can pass the rolled up newspaper test but then not engage properly when needed. Get either an AC Delco or a Hayden brand, as the cheaper ones are very hit and miss. Even with a life time warranty they're not worth it as you'll only become an expert at changing out clutches.

Be careful with flex fans. They never fully disengage and need to be "tuned" to each individual engine. I had an Old's 350 that would glide up mountain passes with no problems, but when I put a flex fan on there, it felt like I was pulling a trailer and could barely get up those steeper grades. When I switched back to the factory fan clutch set up, it was climbing those hills again like they were nothing.
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post #15 of 48 (permalink) Old May 13th, 19, 8:56 PM
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Re: How hot does your car run idle & cruise?

What is the newspaper test?

Only flex fan I really like is made by Flexalite? Is a black nylon plastic piece quie (cheap!)moves plenty of air butdoesnt seem to be a real drag on things.
Bigger blades may seem to help just dont care foe all that weight to be hanging off the water pump nose

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