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Need advice with burnt exhaust valve. #1398043
03/06/13 03:06 PM 03/06/13 03:06 PM
Joined: Nov 2008
Posts: 833
MN
hemidup Offline OP
super stock
hemidup  Offline OP
super stock

Joined: Nov 2008
Posts: 833
MN
What could be the cause of this? Too much advanced timing, too little retarded timing? It's a boosted motor with no signs of detonation.

7615639-mmw2010054.jpg (203 downloads)
Jerry Williams.
Re: Need advice with burnt exhaust valve. [Re: hemidup] #1398044
03/06/13 03:15 PM 03/06/13 03:15 PM
Joined: Feb 2003
Posts: 4,953
Houston, Texas
TheOtherDodge Offline
master
TheOtherDodge  Offline
master

Joined: Feb 2003
Posts: 4,953
Houston, Texas
Turbo or supercharged?

What kind of valve? Turbocharged really needs a good exh valve.

Based on your pic, it looks to be lean..?
Re: Need advice with burnt exhaust valve. [Re: hemidup] #1398045
03/06/13 03:34 PM 03/06/13 03:34 PM
Joined: Aug 2003
Posts: 43,252
Bend,OR USA
C
Cab_Burge Offline
I Win
Cab_Burge  Offline
I Win
C

Joined: Aug 2003
Posts: 43,252
Bend,OR USA
It looks like a piece of the valve broke off, yes? Burnt usually is eaten away in a small spot, not a chunk missing I had the same thnig happen on my airplane motor, Lycoming O540-260 HP, it took a pie shape piece out of the valve at 2700 RPM at 8500 ft when leveling off and leaning the mixture to best power, it was a real eye opener It tore up the top of the piston and cylinder head How many hours or miles on the rest of the exhaust valves now? If not many maybe you got one bad one, if a lot maybe it is time to replace all of them to avoid future potential damges, I had two different exhaust valve heads on two different occasions break off in my 426 Stocker years ago,2 piston and heads had to be replaced

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Need advice with burnt exhaust valve. [Re: Cab_Burge] #1398046
03/06/13 04:03 PM 03/06/13 04:03 PM
Joined: Feb 2005
Posts: 20,192
PA.
pittsburghracer Offline
"Little"John
pittsburghracer  Offline
"Little"John

Joined: Feb 2005
Posts: 20,192
PA.
2 years ago my sons 10 second 360 lost a chunk of a valve like that. Took it home and put another BETTER valve in it and when we were turning the engine over by hand the engine stopped. The valve piece went from the drivers side bank to the passenger side. Pulled the head, took out the piece, and the engine still running today.

1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time
Re: Need advice with burnt exhaust valve. [Re: pittsburghracer] #1398047
03/06/13 04:53 PM 03/06/13 04:53 PM
Joined: Jun 2003
Posts: 9,225
Charleston
S
sixpackgut Offline
Drag Week Mod Champion
sixpackgut  Offline
Drag Week Mod Champion
S

Joined: Jun 2003
Posts: 9,225
Charleston
Jerry, are they Manley valves?

Gen 3 power 6.22@110, 9.85@135
Follow @g3hemiswap on instagram

performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
Re: Need advice with burnt exhaust valve. [Re: sixpackgut] #1398048
03/06/13 05:55 PM 03/06/13 05:55 PM
Joined: Apr 2007
Posts: 951
Temperance, MI
P
prochargedhemi Offline
super stock
prochargedhemi  Offline
super stock
P

Joined: Apr 2007
Posts: 951
Temperance, MI
is that the rear cylinder or the front?
Re: Need advice with burnt exhaust valve. [Re: TheOtherDodge] #1398049
03/06/13 06:21 PM 03/06/13 06:21 PM
Joined: Nov 2008
Posts: 833
MN
hemidup Offline OP
super stock
hemidup  Offline OP
super stock

Joined: Nov 2008
Posts: 833
MN
Quote:

Turbo or supercharged?

What kind of valve? Turbocharged really needs a good exh valve.

Based on your pic, it looks to be lean..?



Supercharged.

Jerry Williams.
Re: Need advice with burnt exhaust valve. [Re: Cab_Burge] #1398050
03/06/13 06:24 PM 03/06/13 06:24 PM
Joined: Nov 2008
Posts: 833
MN
hemidup Offline OP
super stock
hemidup  Offline OP
super stock

Joined: Nov 2008
Posts: 833
MN
Quote:

It looks like a piece of the valve broke off, yes? Burnt usually is eaten away in a small spot, not a chunk missing I had the same thnig happen on my airplane motor, Lycoming O540-260 HP, it took a pie shape piece out of the valve at 2700 RPM at 8500 ft when leveling off and leaning the mixture to best power, it was a real eye opener It tore up the top of the piston and cylinder head How many hours or miles on the rest of the exhaust valves now? If not many maybe you got one bad one, if a lot maybe it is time to replace all of them to avoid future potential damges, I had two different exhaust valve heads on two different occasions break off in my 426 Stocker years ago,2 piston and heads had to be replaced



Actually the valve looked to be cut with a plasma cutter. It happened around the 1000' mark and if I would have not gotten out of it I'm sure the valve stem would have broke since it was almost cut in half.

Jerry Williams.
Re: Need advice with burnt exhaust valve. [Re: sixpackgut] #1398051
03/06/13 06:29 PM 03/06/13 06:29 PM
Joined: Nov 2008
Posts: 833
MN
hemidup Offline OP
super stock
hemidup  Offline OP
super stock

Joined: Nov 2008
Posts: 833
MN
Quote:

Jerry, are they Manley valves?



Callico treated Ferrea valves. After 400 passes I couldn't see any sign of the Callico coating on either the intake or exhaust valves ??? so I replaced the exhaust valves with Ferrea Inconal @ $60 each. ouch

Jerry Williams.
Re: Need advice with burnt exhaust valve. [Re: prochargedhemi] #1398052
03/06/13 06:31 PM 03/06/13 06:31 PM
Joined: Nov 2008
Posts: 833
MN
hemidup Offline OP
super stock
hemidup  Offline OP
super stock

Joined: Nov 2008
Posts: 833
MN
Quote:

is that the rear cylinder or the front?



#8

Jerry Williams.
Re: Need advice with burnt exhaust valve. [Re: pittsburghracer] #1398053
03/06/13 06:45 PM 03/06/13 06:45 PM
Joined: Nov 2008
Posts: 833
MN
hemidup Offline OP
super stock
hemidup  Offline OP
super stock

Joined: Nov 2008
Posts: 833
MN
Quote:

2 years ago my sons 10 second 360 lost a chunk of a valve like that. Took it home and put another BETTER valve in it and when we were turning the engine over by hand the engine stopped. The valve piece went from the drivers side bank to the passenger side. Pulled the head, took out the piece, and the engine still running today.



Pieces of the valve ended up in the #1 and goughed the piston. Another ended up in the #5 and damaged the head.

7615908-mmw2010053.jpg (70 downloads)
Jerry Williams.
Re: Need advice with burnt exhaust valve. [Re: hemidup] #1398054
03/06/13 06:52 PM 03/06/13 06:52 PM
Joined: Jan 2003
Posts: 1,784
PA
W5DART66 Offline
top fuel
W5DART66  Offline
top fuel

Joined: Jan 2003
Posts: 1,784
PA
Did you clean that intake valve in that cylinder?before picture
Re: Need advice with burnt exhaust valve. [Re: W5DART66] #1398055
03/06/13 06:59 PM 03/06/13 06:59 PM
Joined: Nov 2008
Posts: 833
MN
hemidup Offline OP
super stock
hemidup  Offline OP
super stock

Joined: Nov 2008
Posts: 833
MN
Quote:

Did you clean that intake valve in that cylinder?before picture



Nope. I took the pic right after I pulled the head. FWIW I do spray w/m.

Jerry Williams.
Re: Need advice with burnt exhaust valve. [Re: hemidup] #1398056
03/06/13 07:00 PM 03/06/13 07:00 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
Master
MR_P_BODY  Offline
Master

Joined: Jun 2003
Posts: 52,972
Romeo MI
Looking at the plugs and the intake valve that cyl
was very lean.. bad distribution on the intake
Re: Need advice with burnt exhaust valve. [Re: MR_P_BODY] #1398057
03/06/13 07:18 PM 03/06/13 07:18 PM
Joined: Nov 2008
Posts: 833
MN
hemidup Offline OP
super stock
hemidup  Offline OP
super stock

Joined: Nov 2008
Posts: 833
MN
Quote:

Looking at the plugs and the intake valve that cyl
was very lean.. bad distribution on the intake




Those are new unfired sparkplugs that I installed during the compression and leak down testing. I also forgot to mention the electroids on the oriningal plugs were melted. My a/f's were in the 10's.

Jerry Williams.
Re: Need advice with burnt exhaust valve. [Re: hemidup] #1398058
03/06/13 08:45 PM 03/06/13 08:45 PM
Joined: Jun 2005
Posts: 2,776
Ontario Canada
M
MattW Offline
master
MattW  Offline
master
M

Joined: Jun 2005
Posts: 2,776
Ontario Canada
Jerry I forgot your combo.
What intake are you running?
Re: Need advice with burnt exhaust valve. [Re: MattW] #1398059
03/06/13 08:59 PM 03/06/13 08:59 PM
Joined: Nov 2008
Posts: 833
MN
hemidup Offline OP
super stock
hemidup  Offline OP
super stock

Joined: Nov 2008
Posts: 833
MN
Quote:

Jerry I forgot your combo.
What intake are you running?



XV intake manifold.

7616084-XVintake003.jpg (76 downloads)
Jerry Williams.
Re: Need advice with burnt exhaust valve. [Re: hemidup] #1398060
03/06/13 09:19 PM 03/06/13 09:19 PM
Joined: Jun 2005
Posts: 2,776
Ontario Canada
M
MattW Offline
master
MattW  Offline
master
M

Joined: Jun 2005
Posts: 2,776
Ontario Canada
Quote:

Quote:

Jerry I forgot your combo.
What intake are you running?



XV intake manifold.



A couple of thing. First i read that the 90 deg elbow that your using is bad on air distribution. Also your intake is probably not helping.
That being said you would of seen this way before. I believe you have over 300 passes on this combo. Soooooo.
You said your A/F are in the 10s. Is this in the collector or primary pipes?
I/m thinking you should have your injector for that cylinder checked?

Re: Need advice with burnt exhaust valve. [Re: MattW] #1398061
03/06/13 10:18 PM 03/06/13 10:18 PM
Joined: Apr 2007
Posts: 951
Temperance, MI
P
prochargedhemi Offline
super stock
prochargedhemi  Offline
super stock
P

Joined: Apr 2007
Posts: 951
Temperance, MI
Quote:

Quote:

Quote:

Jerry I forgot your combo.
What intake are you running?



XV intake manifold.



A couple of thing. First i read that the 90 deg elbow that your using is bad on air distribution. Also your intake is probably not helping.
That being said you would of seen this way before. I believe you have over 300 passes on this combo. Soooooo.
You said your A/F are in the 10s. Is this in the collector or primary pipes?
I/m thinking you should have your injector for that cylinder checked?



This^^^^^^^

Ran into the same problem on a 4.6 ford mod motor with sullivan intake and super low profile elbow. The elbow didn't give the air enough room to "straighten" back out and always leaned the rear cylinders waaaaayyyyy out. installed a 4 hole carb spacer under it and the problem was fixed. The spacer creates an dam if you will and helps better distribute the air.
Re: Need advice with burnt exhaust valve. [Re: MattW] #1398062
03/06/13 11:09 PM 03/06/13 11:09 PM
Joined: Nov 2008
Posts: 833
MN
hemidup Offline OP
super stock
hemidup  Offline OP
super stock

Joined: Nov 2008
Posts: 833
MN
Quote:

Quote:

Quote:

Jerry I forgot your combo.
What intake are you running?



XV intake manifold.



A couple of thing. First i read that the 90 deg elbow that your using is bad on air distribution. Also your intake is probably not helping.
That being said you would of seen this way before. I believe you have over 300 passes on this combo. Soooooo.
You said your A/F are in the 10s. Is this in the collector or primary pipes?
I/m thinking you should have your injector for that cylinder checked?



Readin a/f from the collector. Been thinking about moving the 02 bung futher down stream. ??? I think your correct and I'll have all my injector's matched to flow. Dang it Matt, you just cost my wife more money. lol

Jerry Williams.
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