Overheating… again

[Cory S]

What is your spark advance during 80mph cruising? If it’s not high enough, combustion temps will be much higher, raising overall CHT’s and ECT’s as well. Just curious.

You haven’t noticed the level dropping at all through all this correct?

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[GregO]

@tdstuart
I don’t recall, do you have the Performance Pack radiator ?

 

[WildHorse]

I set mine to 196f... that way they're not on constantly haha.
Forgot to ask .. gen 3 block w/ gen 2 heads ?

 

[tdstuart]

@tdstuart
I don’t recall, do you have the Performance Pack radiator ?

No just stock replacement radiator

 

[tdstuart]

I set mine to 196f... that way they're not on constantly haha.
Forgot to ask .. gen 3 block w/ gen 2 heads ?

Yep gen3 block with gen2 heads and gen2 head gasket. Same setup ran good before the rebuild though

 

[Cory S]

Yep gen3 block with gen2 heads and gen2 head gasket. Same setup ran good before the rebuild though

I mean. It still runs good right? Just a mere 10-12°F CHT over what you are expecting correct?

 

[WildHorse]

gen2 head gasket

Yer 100% positive it's a gen 2 HG ?

 

[GregO]

Ya when it leaked it leaked bad but it looked like most of the time it wasn’t leaking. But ya after fixing the expansion tank it stayed nice and cool.

Keeping in mind last year you were way down on power so the BTU’s generated are no where close to your latest engine combination.

160+ mph long pulls, non PP radiator, stock hood vents, tuned with higher than stock power……. IMO You’ve entered into the territory of reevaluating some stock cooling components.

 

[K4fxd]

What head studs are you using?

 

[tdstuart]

Keeping in mind last year you were way down on power so the BTU’s generated are no where close to your latest engine combination.

160+ mph long pulls, non PP radiator, stock hood vents, tuned with higher than stock power……. IMO You’ve entered into the territory of reevaluating some stock cooling components.

It's holding fine at long pulls. 230 CHT at 160+mph in 100+ deg heat doesn't really worry me.

And I'm not making any more power. My 60-130 is about a second slower than it was in the winter with my last engine.

The major concern is why it can't hold temp while cruising when other modified cars I know and even cars with a lot more power that make a lot more heat (superchargers, turbochargers) are just fine.

 

[tdstuart]

What head studs are you using?

ARP 12mm headstuds

 

[tdstuart]

Yer 100% positive it's a gen 2 HG ?

Ill go look through my receipts and see if I can find the part number and verify. But I am pretty sure they are gen 2 as that is what I intended to order and they were mismatching the block slightly which is to be expected.

Edit: I checked the part #s on the receipt and its the gen 2 ones. The only thing I can think of is I installed them on the wrong side but I don't think you can.

Edit 2: I looked at my old block and it should be basically impossible to install them upside down or on the wrong side. It would very obviously be wrong.

 

[tdstuart]

What is your spark advance during 80mph cruising? If it’s not high enough, combustion temps will be much higher, raising overall CHT’s and ECT’s as well. Just curious.

You haven’t noticed the level dropping at all through all this correct?

Not sure but the tune is the same as the previous engine.

And it's hard to notice since I have been playing with it so much. But not enough coolant loss to immediately notice.

 

[tdstuart]

I did a combustion gas test (not sure if it works with ethanol though) and it didn't detect any combustion gas in the expansion tank.

I used my ir gun to read hose temps and at idle after a drive and cooling for a few min the top hose was at 82C (about in range) and the bottom was at 85-90C (should be cooler than the top hose).

I then went on a long drive getting the engine to heat to 220+ CHT but when I came back to test my ir gun decided 110+F was too hot and it wouldn't read any more temperatures.

Honestly not too sure what I can test or diagnose at this point. Might have to bite the bullet and start chucking parts at the car, I am thinking a new water pump then a new thermostat (even though the thermostat tested fine). After that, I have no idea besides maybe the radiator being clogged.

 

[GregO]

Honestly not too sure what I can test or diagnose at this point.

“Performance water pump kit for 2011-2021 5.0L and 2015-2020 5.2L engines. Pump delivers 30% improvement in flow over standard pump.”

I’d want that 30% for a few reasons.
Performance Pack radiator for another few reasons.

The MMR mod is in and done with no easy access so there’s no going back to stock freeze plugs w/o a lot of heartache. I think there’s merit in the crossover but only if a few other fundamental flow dynamics are met.

One other thing crossed my mind to ask; stock grill, aftermarket or modified stock ?

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