VQ37 catalytic converter ceramic dust toasting an engine?

ImportConvert · 05-17-2021, 12:01 AM

Is this a carry-over myth from other Nissan engines? I'm doing some deep dive research into the QX50 before buying one, and am curious if the catalytic converter can actually toast an engine?

POS VETT · 05-17-2021, 05:13 AM

I have never heard of it and it sounds implausible.

crazy4oldcars · 05-17-2021, 05:19 AM

Quote:

Originally Posted by POS VETT

I have never heard of it and it sounds implausible.

Same here. The dust would have to go against the exhaust flow to get to the engine.
I've also never heard of catalyst dust in this context. I thought out catalyst was a solid honeycomb?

Kirk B.

ImportConvert · 05-17-2021, 06:28 AM

Quote:

Originally Posted by POS VETT

I have never heard of it and it sounds implausible.

200k expected engine life?

Spooler · 05-17-2021, 07:22 AM

That's a NO!!!

SouthArk370Z · 05-17-2021, 10:31 AM

While the best made cat can create dust as it ages (vibration, heat-cycling, etc) and there can be flow pulses in parts of the exhaust system, even if it was a lot of dust, the flow through the system would push the dust away from the engine. The pulses are much too small (and usually localized near the valve/manifold) to pull anything from the cat to the heads. But I'm no engineer, so prove me wrong.

ImportConvert · 05-17-2021, 10:43 AM

Quote:

Originally Posted by SouthArk370Z

While the best made cat can create dust as it ages (vibration, heat-cycling, etc) and there can be flow pulses in parts of the exhaust system, even if it was a lot of dust, the flow through the system would push the dust away from the engine. The pulses are much too small (and usually localized near the valve/manifold) to pull anything from the cat to the heads. But I'm no engineer, so prove me wrong.

I agree. To pull dust from a cat back into the exhaust valve, an engine would be a total pile of **** power and efficiency wise. That said, ive seen it mentioned on multiple forums about the VQ, so, i ask.

2011 Nismo#91 · 05-18-2021, 06:03 AM

I don't know what car it was but I remember some older car having two catalytic converters and one what right on the exhaust manifold. That I could see getting some failed cat material if go back into the engine.

05-17-2021, 12:01 AM	#1 (permalink)
ImportConvert A True Z Fanatic Join Date: Jun 2010 Location: SWMO Posts: 4,454 Drives: 2019 CX5 GT Reserve Rep Power: 7626	VQ37 catalytic converter ceramic dust toasting an engine? Is this a carry-over myth from other Nissan engines? I'm doing some deep dive research into the QX50 before buying one, and am curious if the catalytic converter can actually toast an engine?

05-17-2021, 05:13 AM	#2 (permalink)
POS VETT Track Member Join Date: Apr 2015 Location: Columbus OH Posts: 612 Drives: Z34\|C4LT4\|C6Z06\|V25 Rep Power: 3366	I have never heard of it and it sounds implausible. crazy4oldcars likes this.

05-17-2021, 10:31 AM	#6 (permalink)
SouthArk370Z Premium Member Join Date: Nov 2010 Location: South Arkansas Posts: 8,435 Drives: 2014 Challenger Rep Power: 324197	While the best made cat can create dust as it ages (vibration, heat-cycling, etc) and there can be flow pulses in parts of the exhaust system, even if it was a lot of dust, the flow through the system would push the dust away from the engine. The pulses are much too small (and usually localized near the valve/manifold) to pull anything from the cat to the heads. But I'm no engineer, so prove me wrong. JARblue likes this. __________________ Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma

05-18-2021, 06:03 AM	#8 (permalink)
2011 Nismo#91 A True Z Fanatic Join Date: Mar 2011 Location: NJ Posts: 2,381 Drives: slowly Rep Power: 33858	I don't know what car it was but I remember some older car having two catalytic converters and one what right on the exhaust manifold. That I could see getting some failed cat material if go back into the engine. __________________ GTR TT 493Whp/431lbft, Ecutek, Southbend 6puck,Quaife, RPM RollBar 4Point, R888R, JRZ RSPro F(10R/10C) R(10R/6C) 1000f500r inlbs+150inlbs Tender, SPL everywhere.Full Specs

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05-17-2021, 07:22 AM	#5 (permalink)
Spooler A True Z Fanatic Join Date: Jun 2014 Location: Ga Posts: 13,516 Drives: 2013 Nismo 370z Rep Power: 2684391	That's a NO!!!