Overheating… again

[GregO]

Yep, except I have an fittings lmao

Let’s think this over a bit.
Did you order rubber or braided hose ?
Did you order the 18+ single O-Ring MMR crossover ?

Sponsored

 

[tdstuart]

Let’s think this over a bit.
Did you order rubber or braided hose ?
Did you order the 18+ single O-Ring MMR crossover ?

It’s the braided hose with AN fittings. Runs up like that picture you showed. And the connector into the heads has 2 orings.

 

[GregO]

It’s the braided hose with AN fittings. Runs up like that picture you showed. And the connector into the heads has 2 orings.

Off the cuff and in my opinion only, I’d want a bleeder port installed at the high point of the crossover hose.
I’d want the option to break open the bleeder during the fill procedure and the ability to break open after a few heat cycles while under pressure.
This is just my opinion so take it as you want.

Isn’t the CHT sensor located on the rear of the right head or do I have that wrong ?

 

[K4fxd]

I'd like to have a water circulation diagram and put a T in the top then either run a hose to a pressure or suction side depending on what the water does at the rear of the heads.

 

[GregO]

 

[K4fxd]

If i am correct the water goes into the block then rises up to the head and exits at the front of the head?

 

[GregO]

I'd like to have a water circulation diagram and put a T in the top then either run a hose to a pressure or suction side depending on what the water does at the rear of the heads.

As I see it the engine high point coolant outlets are about the same elevation as the intake port elevation. The MMR hose high point is well above the coolant outlet ports.
I’m not here to critique MMR’s design but the crossover hose higher than the cylinder head coolant outlet port raises my eyebrow.

The added tee and hose might short circuit cylinder head flow causing additional localized hot spots.

 

[K4fxd]

The added tee and hose might short circuit cylinder head flow causing additional localized hot spots.

That is very possible. I wonder if bending the hose or adding 90 degree fittings and tucking it under the IM would stop the air bubble and let water flow.

As is I don't think water will do anything but sit there. I suppose a flow meter could be installed to find out.

 

[GregO]

That is very possible. I wonder if bending the hose or adding 90 degree fittings and tucking it under the IM would stop the air bubble and let water flow.

As is I don't think water will do anything but sit there. I suppose a flow meter could be installed to find out.

This was my thought at helping push the air out if a bleeder port isn’t installed at the hose high point.
I’m unsure how balanced the left and right cylinder heads flow coolant. Judging by the Ford flow paths I posted I’d say the left head has a slightly higher flow rate. This could explain why the Coyote team placed the CHT sensor at the right rear head as it’s habitually the hottest location.

 

[K4fxd]

I still think both heads are under high pressure at the rear and water will not flow through the hose.

Your Idea is better than mine.

Do the factory race teams run a crossover there?

 

[GregO]

Do the factory race teams run a crossover there?

That I don’t know.
It would be interesting to know if the Yates GT4 5.2 uses a rear crossover.

 

[GregO]

I still think both heads are under high pressure at the rear and water will not flow through the hose.

If it’s trapping air I see it creating a thermal flow disturbance at the back of the heads where the coolant fights to travel both left and right. I’m thinking along the lines the rear crossover is adding another zone to the cooling system but isn’t rejecting the heat.
All a WAG on my part.

 

[WildHorse]

that crossover is nowhere near the hieght of the heater hoses. Therefore moot.

 

[Johnny Rockit]

Renault LeCar had to be jacked up to fill the coolant. Please tell me Ford had a better idea.

 

[WildHorse]

51. Start the engine, and allow it to idle with the cap off. Turn the
heater control valve on the vehicle’s HVAC unit to full hot, and
put the fan on low. Monitor the engine temperature and
coolant level in the reservoir. Add coolant as needed to
maintain proper level in the reservoir, and check your
connections for leaks. If the vehicle begins to overheat or
coolant starts to overflow from the reservoir, shut off the
engine and allow it to cool before continuing. Once the vehicle
is fully warmed up and the coolant level has stabilized, allow
the vehicle to cool off completely, and then top off the coolant
level. Coolant level should be checked once more after putting
in some miles.

Sponsored