I had a coolant issue tonight. I am not sure, I may have to much fluid in there as I have recently filled it. I need to wait until morning to check it. After making a few passes I pushed coolant out the res tank cap.. What would cause this other than too much coolant in resivior. Its a new radiator also Be-Cool. The oil looks clean as could be... Thanks for any help...

 

If you have overfilled it then it will have no where to expand but to go out the resivoir tank!

Take a look at the highest point of the leak and check the ground for the area and you should find it!

Make sure the cap is not cracked!

keep posted!

Thanks,Matt

 

Worst case scenario is a popped head gasket. Back off the timing a few degrees. Did you log it Mike?

 

how much boost are you running? before you go pulling the heads try replacing the res. cap with a new one. Stock I think is 14-15psi, you can get 18-20psi caps from most auto parts stores.

 

Thanks Guys, I did not log the run I dont have software to be able to. I dont think its a timing issue? My last tune was pretty conservative, after the 3rd dyno run I was happy with the numbers and the tuner told me he didn`t even touch the timing yet and it had no knock. I told him to leave alone because I had reached my goals. So I think my timing should be resonable. Remember I know jack squat about tuning!!! I am throwing alot of alky at the motor and at 6500 my wideband is reading 11.3 top of 4th.

The stronger cap sounds interesting but would that be just masking the problem??

I run GM mls head gaskets. I was told they did not have to be retorqued could that be the problem? I am gonna order some new head gaskets so I have them on hand. The coolant at the present is sitting at the level it should (full cold) I dont know if the larger radiator comes into play here with more fluid needing more room but it was cold out last night so I dont think its a heat/pressure issue...

I run ARP Studs and my boost level is at 9lb/10lbs.
Thanks guys calling for some serious rain here in the Northeast and I am off Friday so it may be head removal day. Any more advice would love to have...

 

Before you do anything do a leakdown test and see what happens. I don't retorque the MLS and that's what I run also-I do however torque them down higher then spec. Make sure your pcv system is perfect as well and your not running boost into the crankcase.

 

Thanks Arun, I am greatful for your advice. I feel pretty good about not boosting the crankcase. I run the K&N breather cap and also run a catch can from cajun dude. I opened the bottom of the catch can and it is almost dry. I checked to see if I popped the dipstick out and did not, it is still secure. Gonna have to read up on the leak down test never done one before. When I saw the coolant last night I pulled the breather cap and there was no smoke coming out as many have seen with pressure in the crankcase. I think I will sleep better over the weekend if I pull the heads...

 

No problem buddy, it's a good sign if the dipstick did not pop out. Maybe you just had too much coolant and it just "burped" the air out. When the weather gets better just get on it it again and pay good attention to the coolant levels. Before you take it apart do the leakdown-it will save alot of time.

 

Thanks, Looking for a good link to a leak down test. Sorry never done one before and the more information I have on it the better off I am. I`ve heard many talk about them.

 

Here's a link to good priced one:

http://store.summitracing.com/partde...5&autoview=sku

 

I have seen cars that leak down fine but lift the heads under boost and blow combustion pressure into the coolant.
For the record, the boost was much, much higher than you're running. More like 25-29 lbs.

I wouldn't pull the heads just yet. I would start with the simple stuff for sure as it doesn't sound convincing that have a head gasket problem.

Like you said, you have a conservative tune, MLS gaskets and ARP studs. A great combo to keep combustion in the cylinders.

 

Alright you guys are twisting my arm. I am not gonna pull the heads tonight. Still ordering new gaskets to have on hand. Gonna stop by a local shop I know and see if they have a leak down tester I can borrow for Friday otherwise gonna order thanks for the link.. I think I`m gonna have it put on a dyno so maybe I can see what its doing... Thanks for the help..

My neighbor mechanic has this radiator test kit or something. You put it on the cap and charge it with air. We used that when my wifes jeep head cracked maybe I will see if that tells me anything...

 

right now you have coolant pushing out of your res. the problem could be that your rad cap isn't holding the pressure of your cooling system. you are pressurizing the manifold on a car that wasn't designed from the factory to do so. If it were me, I would replace the cap FIRST, before spending any money or time doing something else, because its the quickest/easiest solution. It may cure the problem and it may not but you won't know until you try.

About it masking the problem, I don't agree with that, you could have a hairline fracture in your head causing the coolant system to get pressurized under boost. replacing the headgaskets won't fix that either.

 

 

Okay got it, Ordered new 18 PSI cap and should be at parts store 8am sharp. New gaskets should be here this eve just in case.

With the BeCool radiator laid down my large lower hose is being bent more than I would like to see. Its not to the point were it is pinched but it may be restricting some flow??? When I first installed the radiator I had to remove some alluminum from where the sway bay mounts are to feel more confortable with coolant flowing. Any chance this could be a problem. Sorry just looking at everything now... Thanks for the help...

 

Well it turned out the coolant was still a little high. I took about 24oz out of it and put the 18 PSI cap on it. Seems my problem has gone away. Went to the track tonight and made a couple passes even missed a few gears and had the pleasure of smacking the rev limiter a couple times and pushed no coolant. Even walked away with a new best 10.379 @128 had to let out up top I was feeling a little wiggle and no need to push the issue. I`m stil getting used to my dragpack and staying in the groove... Thanks for the help guys...