- 1 What causes an intake valve to Tulip?
- 2 What causes increased valve spring surge or harmonics?
- 3 What causes valve stem wear?
- 4 What causes valve seat damage?
- 5 Do stiffer valve springs add horsepower?
- 6 What would be the result of weak valve springs?
- 7 What are signs of bad valve seals?
- 8 What are the symptoms of bad valves?
- 9 What happens if Valve clearance is too big?
- 10 How much should a valve job cost?
- 11 Can a car run with bent valves?
- 12 How much does it cost to fix a bent valve?
What causes an intake valve to Tulip?
The temperature surrounding the valve got much higher than the valve was ever designed to withstand. That excessive temperature resulted in the valve material softening, allowing the valve head to stretch to create what is called a ” tulip ” shape.
What causes increased valve spring surge or harmonics?
A weak valve spring or a spring of inadequate pressure promotes spring surge. An undesirable harmonic or vibration, surge can break the spring or induce valve seat recession or rocker arm failure. Surging is discernible on a Spintron tester video, particularly when the spring closes.
What causes valve stem wear?
A valve stem tends to stick in extreme temperature conditions – due to gumming deposits when it is cold, or carbon packing between the stem and guide when the engine is hot. Either way, the sticking of a valve stem is a symptom of another issue that can lead to bigger problems if the root cause is not identified.
What causes valve seat damage?
Nonintegral valve seats can fail for a number of reasons, especially when they show signs of being cracked or are too worn to be reground or remachined. Eventually the lash in the valvetrain closes up and prevents the valve from seating. This causes the valve to overheat and burn.
Do stiffer valve springs add horsepower?
Re: Heavy valve springs don’t use more HP Stiffer springs may not reduce HP, but they are usually bigger and thus more weight.
What would be the result of weak valve springs?
Weak valve springs will typically cause misfiring and a loss of power as engine speed increases. The engine may start and idle fine, or run normally up to 3500 to 4000 RPM. This will usually destroy the valve and/or piston and cylinder head, causing a catastrophic engine failure.
What are signs of bad valve seals?
Here are some symptoms of a bad valve seal that may need to be replaced:
- Performing the Cold Engine Test. One sure-fire way to tell if you have a faulty valve seal is to perform a cold engine test.
- High Levels of Oil Consumption.
- High Levels of Smoke.
- Engine Braking Test.
- Acceleration Power is Compromised.
What are the symptoms of bad valves?
Ticking or Popping Noises. Ticking or popping noises are the most common types of noises you will hear when you’re having trouble with your valves. Many times, you will hear this ticking before you notice other problems. This noise gets louder and faster as the engine is accelerated.
What happens if Valve clearance is too big?
Too much clearance means the valves will likely clatter and, over the long term, cause damage to the valves, camshaft lobes or rocker arms. If there’s too little valve clearance, the valves won’t fully close, causing excessive heat, and the engine will lose power.
How much should a valve job cost?
A valve job for a 4-cylinder engine costs approximately $85 per valve repaired. On newer engines (V6 or V8), a valve job can cost up to $125 per valve that needs repairing, with the cost increasing for engines with over 12 valves. Therefore, a total valve job can cost upward of $1000.
Can a car run with bent valves?
if the valves are not bent that much, then it can still run with most likely not much problems. If it has bent significantly, it wont run right and can possible break off if it hits the piston and drop the valve.
How much does it cost to fix a bent valve?
A shop will charge you 15-20hours at the shop rate to do the work. That’s easily $900-1300. In fact, it’s the reason the previous owner sold me my beater (93 tbird) for $500. If you can get it off on your own, you can save quite a bit of money on labor.