I've got a 91 Civic with a D15B non vtec in it with a wet 50 shot of NX on it.
I ended up blowing out the center of my head gasket (directly inbetween the Second and Third Cylinders) after just a couple of runs with the nitrous. I noticed my coolant reservoir overflowing and boiling after each run and about 200 feet from the line I would lose power like crazy and it felt like I had the brakes on or something. It would be fine once I let off the nitrous and got out of the throttle for a second or two.

I pulled the head and found what I said before, the head gasket was blown between the 2 and 3 cylinders. I replaced it with a y8 metal head gasket and have not yet sprayed with it yet.
I'm just curious has anyone had this problem when spraying? Or has anyone heard of this happening in Civics. I don't know how long it's been since that head gasket has been replaced, but I'm pretty sure the motor was an imported Jap motor with the supposed 30-40K on it. The valves and the head looked in great condition so I do think it has low miles on it and I haven't sprayed that much on it, only about 2 bottles were used. It started acting like that after one or two sprays on the street and happened on every run on the track.
Let me know if anyone has heard of this... later

 

are you talking about a d15b or a d15 ZC?? because if its just a d15b then thats your problem. those motors are not made for nitrous.

 

nitrous didn't blow your head gasket, a shitty tune did (most likely lean).

 

ugh.... why would you put nitrous in a d15

 

the motor is a D15B non vtec (it's an imported jap 30k Motor).
Honestly no stock motor is 'made' for nitrous.
And my car isn't tuned. Stock PM6 Ecu, stock motor, 50 shot jets (technically it is a bit lower than a 50 and it a bit on the rich side meaning it has more fuel than is needed).

so thanks guys, but the nitrous blew the gasket most likely due to the excessive pressures and heat from the nitrous. Just wondering if anyone has had this problem as well in any civic (ef, eg, ek, em).
thanks again

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by freakystyley_73 &raquo;</TD></TR><TR><TD CLASS="quote">ugh.... why would you put nitrous in a d15</TD></TR></TABLE>
cuz it's cheap and if it blows then it's only 100 bucks for another motor

 

a 50 shot should not blow a head gasket.

 

Okay then why did my head gasket blow?
The car drove fine for almost a year, I raced it, drove it school/work, with no problems.
The car actually ran rich because of a bad o2 sensor. I put the nitrous kit on drove down the street squeezed had some white smoke for just a second out the tail pipe (which went away after I left off the button). I went to the track and noticed the coolant boiling and overflowing. I let it cool down. Filled up the coolant and ran it. Had the drop in power right at the end (which I had on the street as well) and the coolant was boiling again. I drove car home and to work, with no problems, no power loss, no coolant boiling, no white smoke. Sprayed at the track again the next week and imagine that! I had the same problems. This time the gasket was done and I had to park the car and figure out the problem. I didn't know it was the gasket at the time until I pulled the head to find the center of it being blown to ****.

So with my little story in mind how can you not think it was the nitrous causing it to blow? My gasket was one of those Genuine Honda Gray 'composite' gaskets. I put on a y8 metal gasket and like I said haven't sprayed yet, so we'll see what happens.
Later

 

The gasket was probably on the way out anyway, It could have been replaced and not torqued properly and that part squished into the cylinder and took awhile to burn through. the nitrous just helped it along.

I had a similar problem, when i bought my car the garage had just changed the head gasket, 15,000 miles later it went again, they must have just hammered the bolts on the head back in with a big impact gun because I had a snap-on breaker bar starting to bend trying to get the head bolts off the gasket was squished in between the cylinders and protruding slightly into cylinder so it took awhile to burn through and leak again. I replaced the gasket (and new bolts)and sprayed it with that copper spray just to be safe and it has been fine for quite awhile.