Coupe Engine Bay Temperature

[Dave Tabor]

Dave, What weight Mobil 1 are you using?

15W-50 Mobil 1

The engine is a Ford Racing Boss block 302, forged internals, AFR heads. I do not know the bearing clearances.

Dave
Gen III #17

[Skuzzy]

If it was a dino oil, I would be a little concerned about those temps, but for Mobil 1 synthetic, 260F to 290F is fine. You might want to consider switching to 5W-30W or 10W-30W. It may reduce the oil temperature. Higher viscocity oil does make the pump/engine work a bit harder.

[Jphoenix]

15W-50 Mobil 1

The engine is a Ford Racing Boss block 302, forged internals, AFR heads. I do not know the bearing clearances.

Dave
Gen III #17

https://performanceparts.ford.com/do...Z2363FT-RT.PDF

Last page has clearances - this for a 363, but I suspect the 302 is the same. I suspect you can get the same pdf for your block part number. Ford recommends 10w30 or 10w40.

[Namrups]

I have a Boss 427 that's been bored and stroked to 460. It is a street car and not a racer. I broke a valve at the end of last season and the cause was a lifter that gauled and froze in the open position. I was using Moble 1 5w-30 without an oil cooler. My builder is telling me to use 10W-30 with an oil cooler or 10W-40/20W-50 without a cooler.

[lewma]

Updates from todays run. Did about 120 miles this morning.

Started with ambient bay temp of 70F. Within a couple of minutes, up to 115F when idling.

ECT = engine coolant temp
IAT = intake air temp ( via MAF sensor )
BAY = engine bay temp. measured right in front of the firewall about 4" from the hood.


When averaging 40mph on back roads, ECT 192F, IAT 75F, Bay 130F
Sitting in traffic, lights. ECT 203F, IAT 80F, Bay 140F
When averaging 75mph on the highway, ECT 194F, IAT 85F, Bay 120F

For me, the engine bay only starts to cool when i'm doing 60mph+. Anything lower, the bay does not cool at all seems to follow engine temp only.

Also discovered that my cooling fan stopped working sometime today too. Bringing it home was hitting 220F. Applied 12V to the fan. Nothing.

Anyone have any recommendations for a RELIABLE fan setup ? This one only has 1K miles.

Got the new fan installed. Also punched a hole through the forward scoop and the 2 smaller scoops in front of the windshield. More holes than a teabag now

And..... it's raining. Perhaps tomorrow

[JimStone]

Lewma,

Saw the vents on your Google photos album. Looks nice. Do you have the part numbers of the vents you used?

Thanks

[lewma]

Lewma,

Saw the vents on your Google photos album. Looks nice. Do you have the part numbers of the vents you used?

Thanks

Jim

Watch out, they're expensive https://www.amazon.com/dp/B0D78J7FNW...sin_title&th=1

Just took the car out for a quick run in-between rain showers. Didn't get on a highway but did a couple of miles on back roads 50-60mph. It was a little cooler this weekend than last but IAT was sitting high 70s. Ambient low 60s. Engine bay still heats up like an oven when the car is sitting still but starts to cool down when running. This time, with the front vent, then the 2 smaller vents open, at 55mph, the bay was down to 109F and was still dropping until I ran out of road. Previously it was holding at 130F.
I'll try to get on a highway to see what happens at higher speeds.

mark

[Rsnake]

Mark,
Did you still have the hood to cowl seal during your testing?

[lewma]

Greg
Yes. I wanted to change one variable at a time. Once I've been down the highway a couple of times to get an idea of what the vents are doing, ill remove a section of the seal to see if that also helps

I'm considering drilling a couple of holes in the aluminum in front of the radiator to help when sitting stationary in traffic with the fan blowing

Mark

[lewma]

Another 75miles on the car today, 50 of those highway miles. Sun was out, warmer than yesterday. At 65mph+ it seems like the vents really have an effect. They cool the bay from 140F down to 110F within a couple of minutes. At 85mph I think the lowest I saw was 107F with ECT around 192F. The vents seem to be less effective below 60mph.

The flexalite fan seems to be a worthwhile upgrade. Quieter than the stock fan and cools the engine from 200F down to 194F very easily when sitting at lights.

Next tests:
- Remove a section of the hood seal under the windshield to see if that has any effect in cooling the bay
- Drill a few 1.5" holes in the aluminum behind the fan to see if that can contribute to cooling the bay when sitting in traffic and the fan blowing. Did notice that my intake temps were up around 110F when sitting still.

mark

[burchfieldb]

Jim

Watch out, they're expensive https://www.amazon.com/dp/B0D78J7FNW...sin_title&th=1

Just took the car out for a quick run in-between rain showers. Didn't get on a highway but did a couple of miles on back roads 50-60mph. It was a little cooler this weekend than last but IAT was sitting high 70s. Ambient low 60s. Engine bay still heats up like an oven when the car is sitting still but starts to cool down when running. This time, with the front vent, then the 2 smaller vents open, at 55mph, the bay was down to 109F and was still dropping until I ran out of road. Previously it was holding at 130F.
I'll try to get on a highway to see what happens at higher speeds.

mark

Mark,
Did you put 3 or 4 of the soffit vents in?

Brent

[lewma]

Brent I put 1 4" soffit vent in the forward scoop. I planned on putting the 3" vents on the smaller scoops under the windshield but the vents were too deep. I have 3" holes under the vents which I plan on covering with mesh

Mark