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Old 10-24-2011, 06:55 PM   #1
cowboy_Rob
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Default pushing coolant at high boost

ej255 block and heads, vf39, manley pistons, acl race bearings, oem subaru gaskets and new oem headbolts. heads and block were surfaced before install. engine has about 2 years and 30k miles on it since i rebuilt it.

normal driving its fine. if i do an autox day or i run it hard for a bit it pushes coolant out into the overflow resevoir. as long as i keep putting it back in the engine and keep it full it never overheats. i did a block test with the gas tester on top of the pressure bottle and it turns yellow pretty quick so im assuming its headgasket related. think im stretching the stock bolts? as of now theres no coolant/oil mix or external leaks at all. it just builds pressure and a bubble in the cooling system. if so what gaskets and bolts/studs are the hotness lately?
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Old 10-24-2011, 07:56 PM   #2
340Duster
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What kind of boost are you running? If you were looking for an upgrade, I'd suggest OEM gaskets and ARP head studs.
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Old 10-24-2011, 08:06 PM   #3
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25psi. i know its above the efficeincy range but with the big fmic it still makes more power that way till i go buy a bigger turbo.
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Old 10-24-2011, 09:47 PM   #4
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It sounds like my car, at about 25psi it pushed the coolant out of overflow tank, at 22psi it pushed a little coolant but not enough to overflow; I though I had a blown head gasket. I just took my engine apart and the head gaskets are perfect. I think is either a cracked head, something on the coolant system was installed the wrong way, or I was lifting the heads.
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Old 10-25-2011, 01:37 AM   #5
reddevil
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#4 cylinder wall is cracked at the section that the factory mills it to get a socket in.....

FIVE plus blocks lost to this.....

My sad and angry opinion.......
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Old 10-25-2011, 07:01 AM   #6
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Quote:
Originally Posted by reddevil
#4 cylinder wall is cracked at the section that the factory mills it to get a socket in.....

FIVE plus blocks lost to this.....

My sad and angry opinion.......
I've seen that on here a few times I just assumed it would push coolant continuously if that were the case
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Old 10-25-2011, 12:00 PM   #7
reddevil
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No, it just gets worse and worse....till it gets so bad it hydrolocks and boom.
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Old 10-25-2011, 01:24 PM   #8
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you need to re deck the block and heads and make sure they are true flat..then use some real head studs (arp, p&l, rcm. map)
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Old 10-25-2011, 02:44 PM   #9
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Quote:
Originally Posted by soon2bblackongold View Post
you need to re deck the block and heads and make sure they are true flat..then use some real head studs (arp, p&l, rcm. map)
Yep, usually a result of factory head bolts with ~25psi or more of boost. Get some ARP head studs and call it a day.
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Old 10-26-2011, 08:58 AM   #10
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Are stock headgaskets gonna hold once I get studs or should I be looking at cosworths or something?
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Old 10-26-2011, 09:19 AM   #11
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use stock head gasket, use arps, flat and smooth surfaces, torque procedure like the stock subaru manual, but torque to arp specs, center bolts always 10 ft lbs more than the rest, use permatex high tack spray on OEM head gaskets or cooper spray a gasket..

I rather use half inch stud kit from arp so I can get to the 100 ft lbs range!! never had any issue afterwards at 35 psi plus 100 hp of nos!! Torque pattern and flat surfaces to be the main difference among a bad or a good seal!! good luck
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Old 10-28-2011, 03:36 PM   #12
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Hey mines doin the same at about 25 psi on the ole vf39. Get this though, new heads, new block, new everything with ARP 2000 rod and headbolts and oem headgaskets. Ran fine until the 10000 mile marker and is now pushing into the overflow jug (only past 22 psi) I do remember that when i torqued them, i didnt add 10 lbs to the inners and i torqued them to 85 all around with moly lube. Now she runs great and doesnt push coolant until 25 psi, never overheated and still has 145 psi comp all across. Do you guys think that maybe i can add a little bit more torque....maybe 90 and 95 on the inners, if this may still seal good enough to stop my coolant bypassing issue or go ahead and change headgaskets now? God id hate to pull this thing out again!!!
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Old 10-28-2011, 11:33 PM   #13
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My car is doing the same thing at 30-31 psi. Arp's and stock hg's.
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Old 12-16-2011, 09:28 PM   #14
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Update?
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Old 12-26-2011, 05:21 PM   #15
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No update I changed boost controllers so it doesn't overshoot and flutter high anymore and now it'll hit 25 hold 21 without seeming to push coolant. But I also haven't really been flogging it as hard lately with snow tires on already
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Old 12-26-2011, 06:08 PM   #16
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my friend is having a similar issue on his 06. but its a fully built motor. hope it turns out being something simple
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Old 03-06-2014, 12:11 PM   #17
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Resurecting this....i have a fully built motor. Bout 5k miles on it. If i run the car hard at stops the temp gauge will start rising. Once i start moving even a little it drops back down. Reservoir is not full....When i add coolant the problem goes away for some time but comes back eventually....suggestions?
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Old 03-06-2014, 01:53 PM   #18
340Duster
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Are you getting bubbles in the overflow tank? Does the oil look normal? Are your fans coming on properly?
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Old 03-06-2014, 04:44 PM   #19
Coop1103
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No to bubbles, oil has been fine. I will ck the fans. They are slim fans w a mishimoto radiator
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Old 03-06-2014, 05:15 PM   #20
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Headstud time, dawg.
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Old 03-06-2014, 07:52 PM   #21
Coop1103
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That is what i assume...however i already have arp head studs..
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Old 03-06-2014, 08:04 PM   #22
TDagen
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Bad/stuck thermostat?
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Old 03-06-2014, 11:47 PM   #23
Coop1103
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Wouldnt the thermostat have been replaced with the engine build? Gonna try a low temp thermostat to see if that works
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Old 03-06-2014, 11:57 PM   #24
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which ARPs..2000? That might be the issue with your 8374.

Time for some real studs
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Old 03-07-2014, 12:50 AM   #25
340Duster
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You can look under the engine and see if there's staining around the head gasket/shim of coolant.

What are your symptoms other than running warm standing still? Are you constantly having to re-fill the coolant? If it is only running hot while not moving, it's the fans or an issue with shrouds.
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