overheating, new engine help

[mario009]

ok so my car has just been rebuilt with a 2.3 stroker 6bolt block stage V head from slowboy gt35r, anyways the guy that was putting IN my motor said he was done and wanted me to start it up so he would see if it even started. So i did and it did turn on, and as soon as it turned on he started reving it up for a couple of minutes. Anyways, he then reved it up more until the blow off valve would vent to the atmosphere. He did that a couple of times. Anyways he told me to leave it there for about 5 minutes so the bearing or the engine could set in while idleing. I did but then i noticed that the EGT gauge was rising and my car was then overheating right there and overflow was going everywhere...Some one please help, i dont know what it could be.

 

[Ultimatedsm]

Maybe he installed the headgasket wrong or the fans are probably not turning on. Check those two things first. Check the fans first of course then do a compression test to find out if your HG is good.

 

[mario009]

Its a brand new engine and im not leaning towrds the headgastket installation cause the guy that put it on builds race cars, but would the reving up the guy that installed the engine effect the motor and cause it to over heat by anychance or is it something else. im at work right now worried that these 8months ive spent waiting for this car to be ready might shatter my car being ready.

 

[blackGSX2g]

Any coolant leaks? Does the cooling system hold pressure? Good radiator cap/thermostat? Is coolant flowing (water pump, clog in the system, etc)? If all those questions check out, run a hydrocarbon test on your coolant and be prepared for a headgasket replacement.

 

[daren_p]

Its a brand new engine and im not leaning towrds the headgastket installation cause the guy that put it on builds race cars, but would the reving up the guy that installed the engine effect the motor and cause it to over heat by anychance or is it something else. im at work right now worried that these 8months ive spent waiting for this car to be ready might shatter my car being ready.

As for the reving hurting anything, I doubt it. Probably a good thing. I know when my old man got his 383 stroker built they ran it at 2000-3000 rpms on the dyno with varying speeds to "break" the motor in. I would suspect our motors are the same you don't want to just let them sit and idle when first starting them after a build.

 

[mario009]

the thing is when we first started the car, i would say about only 30 sec. of idling he started reving it up and all you could hear was backfiring and you could see the engine shaking a lot. Im gonna go guy a new thermostat and radiator cap today, im pretty sure that machining guy checked to see if my water pump worked or not. But if that doesnt fix it could it be my intercooler or something else?

 

[FlumpDSM]

ok so my car has just been rebuilt with a 2.3 stroker 6bolt block stage V head from slowboy gt35r, anyways the guy that was putting IN my motor said he was done and wanted me to start it up so he would see if it even started. So i did and it did turn on, and as soon as it turned on he started reving it up for a couple of minutes. Anyways, he then reved it up more until the blow off valve would vent to the atmosphere. He did that a couple of times. Anyways he told me to leave it there for about 5 minutes so the bearing or the engine could set in while idleing. I did but then i noticed that the EGT gauge was rising and my car was then overheating right there and overflow was going everywhere...Some one please help, i dont know what it could be.

Wait so do you actually have evidence of what the coolant temp was? Why were you looking at the EGT to see if the engine was overheating? Also, where was the coolant overflowing from? Was it coming out of the overflow bottle or do you just have the line puking into the bay somewhere. I mean this in the absolutely nicest way possible, but it sounds like you have no idea what you are talking about. I think more info is needed. Look at COOLANT temps.

 

[mario009]

, the coolant was coming out from the overflow and i was looking at the temp gauge and it was slowly rising and then i noticed that the egt gauge was slowloy making its way up too.

 

[FlumpDSM]

I'm pretty sure you already mentioned it, but check the t-stat and make sure the fans are running. Also, you could try "burping" the system by leaving the radiator cap and leaving the car running for a bit. Watch out for overflow as it gets hot though. You can usually check to see if your t-stat is working this way too. Just look for circulation.

 

[mario009]

ok i got a new cap and new thermostat. I started the car and had the cap off, and noticed that the coolant wasnt moving at all all i could see were little air bubbles coming up. My rad. doesnt get hot att all. I checked the overflow and no oil. So maybe its my rad, is that possible or is a car only sopposed to be circulating the coolant only when its hot?? or should it be always ciculating?

 

[FlumpDSM]

It should only circulate when the thermostat opens up. Also, another way to check if it is your thermostat is to take the thermostat out and see if the car starts getting hot. Also, if you don't have one I would reccomend getting a logger to see actual coolant temps. The dash gauge sucks a fat one and it doesn't even start moving past the normal mark till 22x degrees or whatever.

 

[blackGSX2g]

Your water pump should be pumping water anytime the car is on. If you are running it and don't see the coolant flowing in the upper radiator hose, then either your water pump is bad, not hooked up, or there is a large clog in your system somewhere.

Does your lower radiator hose get hot?

 

[mario009]

im gonna check after i get off work. Im gonna take off my rad. AND flush it out, run the car with no thermostat and then ill see what the p[roblem is. right?

 

[mario009]

ok guys thank you so much. I actually went to summit racing bought a fluidyne radiator, put it on at about 11:30pm, started my car and it didnt over heat. YES! finally it doesnt over heat , but my car does backfire alot and wont rev past 4k. Is that cause its not tuned roght?

 

[v8s_are_slow]

Are the plug wires on right? What are you using to tune? Might be rich, could just have the plug wires on wrong, could be a boost leak. Everything's tight? Again, what are you using to tune?

 

[fallenauthority]

Chances are you now have a boost leak, pressurize the intake and check it. Guaranteed thats the problem.

 

[mario009]

im at work right now but ill check for a boost leak today, and i have the stock ecu on there i had the safc but sold it while i was doing the rebuild and bought the aem ems but its not installed yet. Im taking it on tuesday to the local tuner.

 

[v8s_are_slow]

Make sure ya solve the problem at hand before installing the AEM. That's all ya need is to have a problem and then install something like an AEM while trying to figure out the troubles you're having.

 

[mario009]

ok so the car is not shaking and backfiring cause its not tuned right? ill check the wires and do a boost leak test also, i have the afpr with the high pressure spring installed as well.