Like I said... When I make a nitrous pass, coolant rushes into the overflow and out. Do I just need a new, higher pressure cap? I know the head gaskets are fine and no smoke out the car. Whatcha think?
Nick
Nick
During Nitrous pass, coolant overflow OVERFLOWS????
- Thread starter Stang8URMPRT
- Start date
IndyBlk5.0
New Member
Because this happened the same way with the last motor. After I melted a piston, I pulled the motor and the head gasket was FINE. Like fuggin' new. But it melted a piston. 
So I say it's not a head gasket because I know from experiance. I've been told by some others that this builds head very fast and causes a high pressure in the cooling system which opens the cap up and lets it all flow to the overflow.
Nick
So I say it's not a head gasket because I know from experiance. I've been told by some others that this builds head very fast and causes a high pressure in the cooling system which opens the cap up and lets it all flow to the overflow. Nick
SLiM JiM 156
Founding Member
how old is the radiator cap, the only thing other than a head gasket that i can think of is when you spray, the coolant gets so hot it pops the cap spring and blows steam in and makes it overflow..
Ranchero5.0
The Voice of Reason
It's because under the extra stress of the nitrous you are lifting the heads and pushing combustion gasses into the coolant system. Same as a blower car with too much boost and too much timing. Been down this road many times. Back the timing off on your next run and see if it goes away.
Jamie
Jamie
Ranchero5.0 said:
You're the man. I'll try that. I enrich with 114 octane, so I didn't think detonation was a problem. i can't hear detonation. But I have heard of the combustion pressure lifting the heads.
Nick
DMAN302
My mom says thanks for the pearl necklace.
Check see if lower hose is colapsing during the run, if there is no coil in the lower hose it could be collapsing causing a pressure spike.
DMAN302
My mom says thanks for the pearl necklace.
Dow...ok you got me on the checking the hose during the run, but seriously you should always look at every posibility and if the hose does collapse the pressure has to go somewhere.
You guys are being very helpful and I thank you. That's why I come on here and give all the advice I can give. Because you get it in return. . As far as the lower hose having a coil in it, it doesn't... The head bolts are ARP and about a year and a half old. The radiator cap is 13 psi I believe. Maybe I should get a 16 psi cap and a coiled lower hose.
Nick
. As far as the lower hose having a coil in it, it doesn't... The head bolts are ARP and about a year and a half old. The radiator cap is 13 psi I believe. Maybe I should get a 16 psi cap and a coiled lower hose.Nick
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