Is this normal on a head? Pic
Thread Starter
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
Is this normal on a head? Pic
This is the drivers side head from the "engine from hell".It has only 400 miles on it before #1 went haywire(after #2 went to hell).My question is with only 400 miles should the intake valves have that burn on them? I've never had to take one apart after 400 miles.I can see the pattern-its opposite the exhaust valve-so is this the flow in the chamber?Also dont valves turn?It seems to me this burn would only get worse but maybe its normal and the whole valve would just turn this color after more miles.Thanks for looking.
PS-the ZZ4 replacement is here and was ordered yesterday !!!
EDIT-#1 valve is currently open-its bent-just in case that it looked wierd and didnt match the others-the space between the valves.
PS-the ZZ4 replacement is here and was ordered yesterday !!!
EDIT-#1 valve is currently open-its bent-just in case that it looked wierd and didnt match the others-the space between the valves.
Last edited by ...Roger...; Aug 24, 2007 at 12:53 PM.
Thread Starter
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
Burning Brakes
Joined: Jan 2007
Posts: 1,057
Likes: 4
From: Concord Calif
This is the drivers side head from the "engine from hell".It has only 400 miles on it before #1 went haywire(after #2 went to hell).My question is with only 400 miles should the intake valves have that burn on them? I've never had to take one apart after 400 miles.I can see the pattern-its opposite the exhaust valve-so is this the flow in the chamber?Also dont valves turn?It seems to me this burn would only get worse but maybe its normal and the whole valve would just turn this color after more miles.Thanks for looking.
PS-the ZZ4 replacement is here and was ordered yesterday !!!
EDIT-#1 valve is currently open-its bent-just in case that it looked wierd and didnt match the others-the space between the valves.
PS-the ZZ4 replacement is here and was ordered yesterday !!!
EDIT-#1 valve is currently open-its bent-just in case that it looked wierd and didnt match the others-the space between the valves.
Racer
Joined: Feb 2007
Posts: 262
Likes: 2
From: FREDERICKSBURG VA
Thread Starter
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
Melting Slicks
Joined: Feb 2003
Posts: 3,053
Likes: 4
St. Jude Donor '03,'11
he even works late......all the way to 10pm. Two dollars per minute paid by check, credit card or money order.
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Thread Starter
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
So what do you think of those burn marks? I would value your opinion.
Melting Slicks
Joined: Feb 2003
Posts: 3,053
Likes: 4
St. Jude Donor '03,'11
Looks normal to me. Looks like some soot from running rich. The area of blackened intake is the area where you would expect less flow due to the combustion chamber and cylinder shrouding the valve so theres not enough heat to burn it off.
You owe me $10. will that be cash, check or charge?
Last edited by turtlevette; Aug 24, 2007 at 09:54 PM.
Race Director
Joined: Sep 1999
Posts: 11,361
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From: Plano TX
One thing I dont like is that the exhaust valves are not whitish in appearance. The exhaust valves should run very hot and a white, crusty, deposit should form on them. Yours show no sign of this.
Le Mans Master
Joined: Oct 2002
Posts: 7,098
Likes: 378
From: Las Vegas - Just stop perpetuating myths please.
Bad geometery.
If u stuck (or sucked) that exh vlv on #1 the vlv stems where pushed into to guides and the rocker tip terribly mis-aligned.
Maybe p-rods wrong size or rockers not aligned for some reason - maybe vlv stems too short. I think if vlvs not adj right - no preload - that could ruin the vlv train in short time also.
But no sign of vlvs hitting pistons.
IMHO a burnt vlv is just that - burnt enough its missing metal and i don't see that here.
Someone setup the vlv train wrong or maybe adj vlv wrong though i have adj the vlv wrong myself before and never snapped a stud let alone stuck a vlv.
Good lesson here in bad vlv train geometery,
cardo0
Maybe p-rods wrong size or rockers not aligned for some reason - maybe vlv stems too short. I think if vlvs not adj right - no preload - that could ruin the vlv train in short time also.But no sign of vlvs hitting pistons.
IMHO a burnt vlv is just that - burnt enough its missing metal and i don't see that here.
Someone setup the vlv train wrong or maybe adj vlv wrong though i have adj the vlv wrong myself before and never snapped a stud let alone stuck a vlv.
Good lesson here in bad vlv train geometery,
cardo0
