North American Turbocoupe Organization



Destroyed valve???
Jarron Offline
Senior Member
#1
What in the world could've caused this? http://natomessageboard.com/uploads/00005036/Cyl3.JPG
This is the #3 exhaust valve? Please help. Need to know what are possible causes before head is ready to go back on. The car has 295,000 on it if that helps any.
1987 TC aka BIRDPWR - 5 Speed - Silver / Raven; NEW MOTOR!, .48 T3/4 Stage II, BOV, Gillis BoostValve,K & N Filter, MSD Ignition, 3G Alt, HID 8000s.

NEXT UP: 3" DP, 255HP fuel pump, AFPR, larger injectors, FMIC
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dpmeeks Offline
Member
#2
Jarron, these engines are not interference engines so it couldve been debris in the cyl bore, bad detonation, fluid in the cyl, anything. Important thing is the cyl bores are clean and the head is redone correctly and you should be ok.
Silver- 87, 5-speed,
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Jeff K Offline
Administrator
#3
Running lean, which makes exhaust temp very high, severe detonation caused by too much boost, low octane gas, timing issues, or running lean.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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Pete D Offline
Administrator
#4
I chipped a valve under hard detonation. With that kind if mileage I'd have the injectors cleaned and flowed to make sure it wasn't fuel related
Pete Dunham


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Jarron Offline
Senior Member
#5
Off comes the injectors then. What is "interference" engine? By the way, thanks guys
1987 TC aka BIRDPWR - 5 Speed - Silver / Raven; NEW MOTOR!, .48 T3/4 Stage II, BOV, Gillis BoostValve,K & N Filter, MSD Ignition, 3G Alt, HID 8000s.

NEXT UP: 3" DP, 255HP fuel pump, AFPR, larger injectors, FMIC
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dpmeeks Offline
Member
#6
jarron.. like the word says " interference " i.e. obstruction. on some engines the valves open so close to the pistons that if the timing belt breaks it can cause the piston to hit the valves and cause damage ( interference )
luckily our engines are not that way Smile
Silver- 87, 5-speed,
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Kev Offline
Posting Freak
#7
"Interference" refers to the possibility of the valves coming in contact with the tops of the pistons in an event such as the timing belt letting loose and everything spinning wildly. In our engines, the valves and pistons will never touch when either is spun freely, thus "non interference".

Crap, dp beat me to it. Big Grin
Kev
1988 TC 5spd
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dpmeeks Offline
Member
#8
lol kev... I just wanted so sound smart for a minute LOL
Silver- 87, 5-speed,
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Jarron Offline
Senior Member
#9
Ohhhhhhhhhhhhh... thanks fellas....looks like im in the hunt for a new cam too....
ranger roller as far as the cheapest route? Tryin to get her up & running.
1987 TC aka BIRDPWR - 5 Speed - Silver / Raven; NEW MOTOR!, .48 T3/4 Stage II, BOV, Gillis BoostValve,K & N Filter, MSD Ignition, 3G Alt, HID 8000s.

NEXT UP: 3" DP, 255HP fuel pump, AFPR, larger injectors, FMIC
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thumper Offline
Posting Freak
#10
RRs are pretty cheap, especially if you pull it yourself from the junkyard. I just bought one from RDOG with all followers for $85 shipped, seemed to be a little lower than the average setup from eBay.

The cam swap is easy on these motors, especially with the head pulled.

On a personal note, I really like how the roller smoothed the idle. Also seems to make the motor more torquey lower in the RPM range.

Good luck!
A.K.A. Corey Bennett

1988 TC: white, all options, 5-speed swap, K&N cone filter, "Ranger" roller camshaft, .60/.63 T3, NXS (Gillis-style) Boost Valve, Bosch BOV w/ check valve, Stinger 3" with axle dump (18" glass pack), 95A 3G

Some pictures: http://s639.photobucket.com/albums/uu111/cbennett4041/
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