If you’re a car enthusiast or have a passion for high-performance engines, then you’re probably familiar with the Thumpr cam.
It’s known for its aggressive sound and improved horsepower, but it also has a few drawbacks.
In this blog post, we’ll take a closer look at the common Thumpr cam problems that you may encounter and explore potential solutions to help you get the most out of your engine.
10 Common Thumpr Cam Problems
Here are 10 problems associated with using a Thumpr cam, and what causes them:
Rough Idle:
One of the most well-known problems with using a Thumpr cam is the rough idle it can cause.
This is because of the cam’s aggressive profile, which can cause the engine to have a choppy idle.
The large overlap between the intake and exhaust valves can cause a significant amount of air to flow out of the exhaust even during the intake stroke.
This can be a turn-off for some drivers, who prefer a smoother idle.
To diagnose a rough idle caused by a Thumpr cam, check for any vacuum leaks, which can exacerbate the problem.
It may also be necessary to adjust the engine’s timing or fuel mixture to achieve a smoother idle.
Poor Fuel Economy:
Another problem with the Thumpr cam is that it can cause poor fuel economy.
This is because the cam’s high lift and long duration can cause the engine to use more fuel, particularly at low RPMs.
The engine is not able to efficiently burn all of the fuel that is being injected into the combustion chamber, resulting in a higher fuel consumption rate.
To diagnose poor fuel economy, check the engine’s air and fuel delivery systems for any issues, such as clogged air filters or dirty fuel injectors.
It may also be necessary to adjust the engine’s timing and fuel mixture to optimize fuel efficiency.
Loss of Low-End Torque:
The Thumpr cam is designed to provide more power at higher RPMs, which can come at the expense of low-end torque.
This can be a problem for drivers who need quick acceleration from a stop or want a more responsive throttle.
To diagnose a loss of low-end torque, it may be necessary to adjust the engine’s timing, fuel mixture, or ignition timing.
It may also be necessary to upgrade other engine components, such as the intake and exhaust systems, to improve low-end torque.
Reduced Vacuum at Idle:
The Thumpr cam’s large overlap can also cause a reduction in vacuum at idle.
This can result in issues with power brake systems and other vacuum-powered accessories.
To diagnose reduced vacuum at idle, check for any vacuum leaks in the engine’s intake system, and ensure that the power brake system is properly connected and functioning.
Difficulty Starting:
In some cases, the Thumpr cam can cause difficulty starting the engine.
This is because the engine requires a certain amount of vacuum to start, and the large overlap of the cam can cause a reduction in a vacuum.
To diagnose difficulty starting, check the engine’s starter motor and battery for any issues, and ensure that the engine’s fuel and ignition systems are properly functioning.
It may also be necessary to adjust the engine’s timing and fuel mixture to improve starting performance.
Stalling at Low Speeds:
Another problem with the Thumpr cam is that it can cause the engine to stall at low speeds.
This is because the engine requires a certain amount of vacuum to maintain idle speed, and the large overlap of the cam can cause a reduction in a vacuum.
To diagnose stalling at low speeds, check for any vacuum leaks in the engine’s intake system, and ensure that the engine’s fuel and ignition systems are properly functioning.
It may also be necessary to adjust the engine’s timing, fuel mixture, or idle speed to prevent stalling.
Increased Engine Noise:
The aggressive profile of the Thumpr cam can also cause an increase in engine noise.
This can be desirable for some drivers, who enjoy the sound of a high-performance engine, but it can also be a turn-off for others who prefer a quieter ride.
To diagnose increased engine noise, check for any issues with the engine’s exhaust or intake systems, and ensure that the engine’s components are properly lubricated and maintained.
It may also be necessary to adjust the engine’s timing or fuel mixture to reduce noise.
Increased Engine Wear:
Using a Thumpr cam can also cause increased wear and tear on the engine components.
This is because the cam’s aggressive profile can put more stress on the valve train, resulting in premature wear and failure of components such as lifters and pushrods.
To diagnose increased engine wear, check for any signs of damage or wear on the engine’s components, such as the lifters and pushrods.
It may also be necessary to upgrade these components or adjust the engine’s timing and fuel mixture to reduce stress on the valve train.
Decreased Engine Lifespan:
As a result of the increased wear and tear on engine components, using a Thumpr cam can also result in a shorter engine lifespan.
This is particularly true if the engine is not properly maintained or if the cam is not compatible with other engine modifications.
To diagnose a decreased engine lifespan, check for any signs of damage or wear on the engine’s components, and ensure that the engine is properly maintained and lubricated.
It may also be necessary to adjust the engine’s timing and fuel mixture, or upgrade the engine’s components to improve longevity.
Poor Emissions Performance:
The Thumpr cam can also cause poor emissions performance, particularly if the engine is not properly tuned.
The cam’s high lift and long duration can result in unburned fuel and increased emissions, which can cause the engine to fail emissions tests.
To diagnose poor emissions performance, check the engine’s emissions system for any issues, such as a faulty oxygen sensor or catalytic converter.
It may also be necessary to adjust the engine’s timing and fuel mixture to reduce emissions.
How to Fix Thumpr Cam Problems?
Here we will discuss step-by-step procedures to fix the Thumpr cam problems.
Step 1: Diagnose the Problem
The first step in fixing Thumpr cam problems is identifying the issue.
Some common signs of a camshaft problem include rough idling, decreased performance, and engine misfires.
It’s important to perform a thorough inspection of the camshaft and related components to pinpoint the issue accurately.
Step 2: Check for Mechanical Issues
Mechanical problems can arise from various issues, including worn cam lobes, damaged valve springs, and faulty pushrods.
Inspect the camshaft and related components, including the lifters, rocker arms, and timing chain, for any signs of wear or damage. Replace any damaged parts as necessary.
Step 3: Verify Proper Installation
Thumpr camshafts require precise installation to achieve optimal performance.
Improper installation can cause a range of issues, including timing chain wear and misalignment of the camshaft.
Verify that the camshaft is installed correctly and that all related components are properly aligned.
Step 4: Adjust the Valve Lash
Valve lash refers to the clearance between the valve and the rocker’s arm. Incorrect valve lash can lead to valve train noise and decreased performance.
Adjust the valve lash according to the manufacturer’s specifications to ensure optimal performance.
Step 5: Consider Upgrading Supporting Components
Thumpr camshafts are designed for high-performance engines and may require supporting modifications to achieve optimal performance.
Consider upgrading supporting components, such as the intake manifold and exhaust system, to complement the Thumpr camshaft.
Thumpr Cam Maintenance Tips
Here are some tips for maintaining your Thumpr cam.
Regular Inspection
To maintain your Thumpr cam, it’s important to inspect it regularly. You can start by checking the camshaft for wear and tear, as well as for any signs of damage.
Look out for any excessive wear on the lifters and pushrods, and check the rocker arms for any signs of wear or damage.
If you notice any issues, it’s important to address them as soon as possible to prevent further damage.
Keep it Lubricated
Lubrication is crucial for maintaining your Thumpr cam.
Make sure to use the recommended type of oil and ensure that the camshaft, lifters, pushrods, and rocker arms are adequately lubricated.
Lack of lubrication can cause wear and tear, resulting in reduced performance and potential damage to your engine.
Check Valve Timing
Proper valve timing is essential for optimal performance. Make sure to check the valve timing periodically and adjust it if necessary.
Timing that is off can lead to reduced performance and potential damage to your engine.
Avoid Overheating
Overheating is a common issue that can cause damage to your Thumpr cam.
Make sure to monitor your engine’s temperature and avoid running it at high temperatures for extended periods.
Overheating can cause excessive wear on the camshaft, lifters, and other components, reducing their lifespan.
Consult a Professional
If you’re unsure about how to maintain your Thumpr cam, it’s always a good idea to consult with a professional.
They can provide you with expert advice and ensure that your cam is maintained properly.
FAQ
What Causes My Thumpr Cam To Make A Ticking Noise?
A ticking noise could be caused by insufficient valve lash adjustment or worn out lifters.
It could also be due to inadequate lubrication or a damaged pushrod.
How Can I Tell If My Thumpr Cam Is Not Working Properly?
You may notice poor engine performance, such as reduced power, acceleration, or fuel economy.
You may also experience rough idling, misfiring, or backfiring. In some cases, the engine may not start at all.
How Can I Fix A Thumpr Cam That Is Not Working Properly?
The solution depends on the specific issue.
If the problem is caused by worn lifters or inadequate lubrication, you may need to replace them.
If it’s a valve lash adjustment issue, you can adjust the lash to the proper clearance.
In some cases, you may need to replace the entire camshaft.
What Kind Of Oil Should I Use With My Thumpr Cam?
It’s recommended to use a high-quality synthetic oil with a high zinc content to provide adequate protection for your camshaft and lifters.
How Often Should I Change The Oil With A Thumpr Cam?
It’s recommended to change your oil every 3,000 miles or three months, whichever comes first.
However, you may need to change it more frequently if you frequently drive in extreme conditions or use your vehicle for racing.
Do I Need To Break In My Thumpr Camshaft?
Yes, it’s essential to break in a new thumpr camshaft properly to ensure its longevity and performance.
Follow the manufacturer’s instructions carefully for the break-in period, which typically involves avoiding high RPMs and varying the engine speed during the first few hundred miles.
Can a thumpr cam damage my engine?
While a thumpr cam can provide improved performance and a unique sound, improper installation or use can cause damage to your engine.
It’s crucial to follow the manufacturer’s instructions carefully and to use high-quality components and lubrication to ensure proper performance and longevity.
Conclusion
If you’re experiencing problems with your Thumpr cam, don’t panic.
Thumpr cams have been known to cause issues with idle quality and low-speed driveability, but there are several solutions to these problems.
First, ensure that your engine’s timing is set correctly and that the camshaft is properly installed.
Second, consider upgrading your valve springs to match the cam’s lift and duration. Third, adjust the carburetor or fuel injection system to match the cam’s profile.
Finally, consider consulting a professional engine builder or tuner for additional guidance.
With proper installation and tuning, your Thumpr cam can deliver the aggressive sound and performance you desire without sacrificing drivability.
