Burnt N54 Exhaust valve

NukedN54 · 08-09-2024, 06:19 PM

How bad is this burned exhaust valve?
This is a donor motor with 97k on it.
Guy said it come out of a stock car that was getting an LS swap.
I don't really want to pull the head because I was told unless you refinish the head and block or use a cut ring gasket, this motor will not seal as good as factory.
Out of 10 how bad is this?
Can I just slap my 19Ts on it and go?
Will this just burn a little extra oil?
Is this compromising and needs to be addressed?

Podunk · 08-10-2024, 11:04 AM

too blurry to see anything

NukedN54 · 08-10-2024, 12:29 PM

Quote:

Originally Posted by Podunk

too blurry to see anything

The valves are visible white

TheMidnightNarwhal · 08-10-2024, 12:51 PM

Uhhh isn't that normal?

Brandoch · 08-10-2024, 02:12 PM

The question is; do you know what a burnt valve is?

NukedN54 · 08-10-2024, 03:30 PM

Quote:

Originally Posted by TheMidnightNarwhal

Uhhh isn't that normal?

The other 5 have carbon build up so this one stands out. trying to figure out if I need to do work before installing the new motor.

NukedN54 · 08-10-2024, 03:31 PM

Quote:

Originally Posted by Brandoch

The question is; do you know what a burnt valve is?

Are you saying this isn't a burnt valve? Again I'm mainly trying to figure out if I have to do any work before installing this new motor.

Brandoch · 08-10-2024, 03:45 PM

Quote:

Originally Posted by NukedN54

The other 5 have carbon build up so this one stands out. trying to figure out if I need to do work before installing the new motor.

Why did you not say that originally and include pictures? We need info to help

Quote:

Originally Posted by NukedN54

Are you saying this isn't a burnt valve? Again I'm mainly trying to figure out if I have to do any work before installing this new motor.

I was asking if you know what a burnt valve is.

NukedN54 · 08-10-2024, 03:47 PM

Quote:

Originally Posted by Brandoch

Why did you not say that originally and include pictures? We need info to help

I was asking if you know what a burnt valve is.

After more research I guess this is likely not a burnt valve and rather a leaky valve seal. I guess It should be replaced.

Podunk · 08-24-2024, 03:50 AM

Quote:

Originally Posted by NukedN54

After more research I guess this is likely not a burnt valve and rather a leaky valve seal. I guess It should be replaced.

my research resulted in normal, to gas additives, to lean burn in that cylinder, to valve stem seals leaking.

iqraceworks · 08-26-2024, 10:28 AM

Pretty normal looking to me. You can't look at a valve stem and tell if it's "burnt". When most people refer to a "burnt valve"...it's when the valve has an actual burn spot on the sealing surface and it won't seal. It has nothing to do with the look of the valve stem.

Do a leak down test...that will tell you if the valves are leaking.

08-09-2024, 06:19 PM	#1
NukedN54 New Member 0 Rep 5 Posts Drives: 07 BMW e90 Join Date: Aug 2024 Location: Detroit iTrader: (0)	Burnt N54 Exhaust valve How bad is this burned exhaust valve? This is a donor motor with 97k on it. Guy said it come out of a stock car that was getting an LS swap. I don't really want to pull the head because I was told unless you refinish the head and block or use a cut ring gasket, this motor will not seal as good as factory. Out of 10 how bad is this? Can I just slap my 19Ts on it and go? Will this just burn a little extra oil? Is this compromising and needs to be addressed? Attached Images
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08-10-2024, 11:04 AM	#2
Podunk Private First Class 40 Rep 102 Posts Drives: 335I E90 Join Date: Mar 2024 Location: MO iTrader: (0)	too blurry to see anything
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08-10-2024, 12:51 PM	#4
TheMidnightNarwhal Major General 2814 Rep 6,384 Posts Drives: 11' 335is DCT Join Date: Jun 2015 Location: Gatineau, Quebec iTrader: (0)	Uhhh isn't that normal?
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08-10-2024, 02:12 PM	#5
Brandoch Lieutenant 866 Rep 794 Posts Drives: 2009 E93 M3 DCT Join Date: Dec 2017 Location: BC Canada iTrader: (0) Garage List 2009 BMW E93 M3 [9.75] 2011 BMW F25 X3 28i [8.50]	The question is; do you know what a burnt valve is?
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08-26-2024, 10:28 AM	#11
iqraceworks Brigadier General 2088 Rep 3,809 Posts Drives: 2007 335i Join Date: Aug 2019 Location: Missouri iTrader: (0)	Pretty normal looking to me. You can't look at a valve stem and tell if it's "burnt". When most people refer to a "burnt valve"...it's when the valve has an actual burn spot on the sealing surface and it won't seal. It has nothing to do with the look of the valve stem. Do a leak down test...that will tell you if the valves are leaking. __________________ 2007 335i, BMS DCI, BMS Chargepipe w/Tial BOV, ARM Catless Downpipes, silicone inlets, Bilstein B12 Prokit Suspension, Whiteline subframe bushings, Front/Rear M3 control arms, G-Plus FMIC, Stage 2 LPFP, Custom E40 tune by Justin (V8Bait), xHP stage 3 transmission flash, RB Two Turbos....10.90 @ 128mph
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