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Pushing Coolant/ New HG

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Clutch450

10+ Year Contributor
252
1
Jan 15, 2009
Lancaster, Pennsylvania
So with the back story, I've been building this car up over the last couple years.
Originally finished in may. Ran great except for the fact that I kept pushing coolant out of the rad cap. Ended up finding out that having the heater core blocked was causing too much pressure. Fixed that.
Ever since all that car pushes coolant into the overflow. Replaced the HG once already. Now it is doing it again.
Could I possibly have blown another one?

Engine is a JAM built 2.4 g4cs on e85 with an fp3065 at 45psi. Cometic mls and L19's
Bore size is 87.5mm so I am forced to run a cometic mls

During a 3rd gear pull the car literally pushes up to a gallon of coolant out.
Any help or tips would be appreciated. Have way too much time and money into this car and running out of patience.
 
if the block/head are not PERFECTLY decked and matched then it could easily still be the headgasket. With your setup at that power, any imperfection will be obvious and cause such a thing.

I had the same issue after installing a cometic MLS on my block that seemed to be perfectly smooth with my freshly decked head and it still ended up pushing - granted I was more around 500whp on e85 on a FPGreen at 25-27psi.

Not 100% sure that's your issue, but it sounds like a damn good bet.
 
I agree with Clinical, There is no way you should be pushing a gallon of coolant. Did you use copper spray on the head gasket?[DOUBLEPOST=1410981697][/DOUBLEPOST]Did you buy a complete long block from JAM or just the short block and had your head ported? Did you measure the stretch in the ARP bolts when you pulled the head last time to make sure they were still in spec? Just throwing out some ideas, because running 45 P.S.I on a 10:1 motor plus I'm sure since your running E-85 your timing table is very aggressive leads to some serious cylinder pressures and if one thing is out of spec such as a warped head from that coolant problem prior then you may need to have it checked out.
 
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It was my block that I sent to them. They built it up with all new internals. They also had my head which they milled, and ported.
I did not measure the stretch in the ARP's as I've always been under the impression that the L19 are almost stretch resistant.
I did not use copper spray, I've never used it, only ever heard bad things about it.

I just went out and did a 10psi pull and it is still pushing out a good amount.
Guessing my last resort is to do a leak down test and pull the head.
 
It is not very common but it most certainly can happen. Did you ever re-torque them after a heat cycle like you should? What kind of torque wrench were you using an old one or a new 100% sure calibrated one? What did you torque them to? Only a suggestion with as much boost as you are running I would use the ARP lube and torque them down to 105-115 FT. LBS. I have mine torqued to 105 haven't had any problems so far and running close to 70 LBS/MIN with a solid tune. All's it takes is the slightest amount of detonation to lift that head even with the almighty L19's. You just have to take the cylinder pressure into consideration here. Have you ever logged any knock and what are your WOT timing numbers?
 
While tuning we logged knock a few times. With 5 degrees being the highest we got.
I have them torqued to 95 ft/lbs using a new snap-on wrench and arp lube.
I checked them after a few heat cycles and they were still right on.
I'd have to go back into the logs and check what the timing numbers were, I do not remember at the moment.
 
5 degrees is enough to warrant concern. I would try retorqueing but it sounds like you might be looking at pulling the head either way. Honestly I would lightly use some copper spray with an MLS. Never with an OEM organic gasket.
Honestly that detonation with that much boost could be enough to be lifting that head which would make sense to me especially if that MLS isn't perfectly sealed.
 
What about an o ringing the head? Also if you have the money it's well worth it to get j&s safe guard. It can save your motor and is used on a lot fast cars reliably.
 
With a bore that large it's going to be hard to get a great seal. An o-ring setup is worth a try if you are dead set on using that block.

Also, try running less boost. I'm sure that after 35ish psi on a 2.4 you aren't seeing much more airflow out of that 3065. I'm also willing to bet that at 45 psi, your exhaust mani pressure has got to be close to 100psi.
 
Ok so while the head is off I'm going to go with an o-ring set up.
From the research I've gathered I can ring just the head with copper o-rings and use a MLS gasket.
Is that an accurate conclusion?

Will be going with the Cometic MLS again. Which I believe does not have a built in o-ring like the Fel-Pro does
 
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