exhaust manifold red hot need help - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

justeno_heat · 06-08-2003, 09:37 PM

I just drove my 240 around the block and came back to my house for a test run with my SR and my exhaust manifold was smoking. I put four ice cubes on it to cool it down over a 20 minute period. Has this happened to anyone else?

Muzzy · 06-08-2003, 09:53 PM

the head · 06-08-2003, 10:14 PM

had that problem on a frined's RX-7 caused by way too much fuel and ignition inside the manifold of raw gas check timing and mixture does it backfire or pop inside the pipe?

justeno_heat · 06-09-2003, 01:02 PM

No it doesn't backfire at all and it sounds great. I just took a look at it this morning and I saw a little bit of burnt oil on the side of the valve cover so I guess it is going on the manifold and heating it. I will have to get new cams anyways so I might as well wait to put a new gasket on.

Muzzy · 06-09-2003, 06:29 PM

HA HA!!! ...oil

Nissan_Convert · 06-09-2003, 07:25 PM

i wouldn't put ice cubes on it anymore, your manifold may crack because of the extreme high temperature to extreme low temperature change. Check your a/f ratios. Have you had your manifold a long time or what?

Bill Roberts · 06-09-2003, 09:21 PM

Nissan_Convert is absolutly right. I saw a guy hose down a hot engine and the exaust mainifold shattered right there...not like glass, but we heard a snap, cracked it. I was saying to him, stay off the exaust...CRACK...too late..

Oil on a manifold will smoke and stink. Check very carefully for oil leaks. Make sure your V/C gasket is not leaking onto the exaust maifold. Won't catch fire but smokes and smells bad. Makes a mess as well.

When toerqueing the camcomver/valvecover, do not overtorque. If you put too much torque on the screws and do not bolt it on in sequence (opposing bolts , corners to middle to others), you will cause a leak due to crushed gasket and warped cover. I think the spec is in INCH pounds, not ft pounds of torque. They are not to be turned down tight, just very snug.

06-08-2003, 09:37 PM	#1
justeno_heat Leaky Injector Join Date: Mar 2003 Location: Denver, PA Age: 41 Posts: 125 Trader Rating: (0) Feedback Score: 0 reviews	exhaust manifold red hot need help I just drove my 240 around the block and came back to my house for a test run with my SR and my exhaust manifold was smoking. I put four ice cubes on it to cool it down over a 20 minute period. Has this happened to anyone else? __________________ '91 Nissan 240sx Redtop SR20DET Stock T25 8 PSI Bomex body kit B&M short shifter ADR 17" rims 2 10" JL Audio W3's with Kenwood head unit Erebuni carbon fiber hood Koyo aluminum radiatior 240 down for the Summer FROWNING If NISMO stands for Nissan Motorsports, wouldn't Honda Motorsports be HOMO?

06-08-2003, 09:53 PM	#2
Muzzy Zilvia FREAK! Join Date: Jan 2003 Location: TX Posts: 1,555 Trader Rating: (0) Feedback Score: 0 reviews	oil __________________ lemme have a dollar

06-08-2003, 10:14 PM	#3
the head Nissanaholic! Join Date: Jul 2002 Location: in a dark room mastering the art of typing with one hand Posts: 2,164 Trader Rating: (3) Feedback Score: 3 reviews	had that problem on a frined's RX-7 caused by way too much fuel and ignition inside the manifold of raw gas check timing and mixture does it backfire or pop inside the pipe? __________________ I never knew you could do that with an eggplant

06-09-2003, 01:02 PM	#4
justeno_heat Leaky Injector Join Date: Mar 2003 Location: Denver, PA Age: 41 Posts: 125 Trader Rating: (0) Feedback Score: 0 reviews	No it doesn't backfire at all and it sounds great. I just took a look at it this morning and I saw a little bit of burnt oil on the side of the valve cover so I guess it is going on the manifold and heating it. I will have to get new cams anyways so I might as well wait to put a new gasket on. __________________ '91 Nissan 240sx Redtop SR20DET Stock T25 8 PSI Bomex body kit B&M short shifter ADR 17" rims 2 10" JL Audio W3's with Kenwood head unit Erebuni carbon fiber hood Koyo aluminum radiatior 240 down for the Summer FROWNING If NISMO stands for Nissan Motorsports, wouldn't Honda Motorsports be HOMO?

06-09-2003, 06:29 PM	#5
Muzzy Zilvia FREAK! Join Date: Jan 2003 Location: TX Posts: 1,555 Trader Rating: (0) Feedback Score: 0 reviews	HA HA!!! ...oil __________________ lemme have a dollar

06-09-2003, 07:25 PM	#6
Nissan_Convert Join Date: Apr 2003 Location: LA Posts: 13 Trader Rating: (0) Feedback Score: 0 reviews	i wouldn't put ice cubes on it anymore, your manifold may crack because of the extreme high temperature to extreme low temperature change. Check your a/f ratios. Have you had your manifold a long time or what?

06-09-2003, 09:21 PM	#7
Bill Roberts Zilvia FREAK! Join Date: May 2003 Location: S FL. Posts: 1,538 Trader Rating: (0) Feedback Score: 0 reviews	Nissan_Convert is absolutly right. I saw a guy hose down a hot engine and the exaust mainifold shattered right there...not like glass, but we heard a snap, cracked it. I was saying to him, stay off the exaust...CRACK...too late.. Oil on a manifold will smoke and stink. Check very carefully for oil leaks. Make sure your V/C gasket is not leaking onto the exaust maifold. Won't catch fire but smokes and smells bad. Makes a mess as well. When toerqueing the camcomver/valvecover, do not overtorque. If you put too much torque on the screws and do not bolt it on in sequence (opposing bolts , corners to middle to others), you will cause a leak due to crushed gasket and warped cover. I think the spec is in INCH pounds, not ft pounds of torque. They are not to be turned down tight, just very snug.