Just picked up a 2004 F150, dedicated CNG, 49,000 miles. Overall an awesome truck. I'm finally part of the CNG community!
One thing I've noticed with the vehicle is a fairly quiet (but still perceptible) valve clatter. The noise is very much like what the valve clatter from a diesel engine sounds like, EXCEPT this is much much quieter.
Noise is much more obvious when the engine is first started and cold. Seems to go away when the engine is warm.
At first I thought I was hearing the pulsing of the injectors, but it's definitely a clatter and not a "ticking".
Is this sound particular to my vehicle, or is this a normal thing for a dedicated CNG engine? (Wondering if it has something to do with compressions ratio and flame front of CNG, much like why you hear this sound in a diesel).
This is my first CNG vehicle, so I'm interested in the experience of the more experienced people here.
One thing I've noticed with the vehicle is a fairly quiet (but still perceptible) valve clatter. The noise is very much like what the valve clatter from a diesel engine sounds like, EXCEPT this is much much quieter.
Noise is much more obvious when the engine is first started and cold. Seems to go away when the engine is warm.
At first I thought I was hearing the pulsing of the injectors, but it's definitely a clatter and not a "ticking".
Is this sound particular to my vehicle, or is this a normal thing for a dedicated CNG engine? (Wondering if it has something to do with compressions ratio and flame front of CNG, much like why you hear this sound in a diesel).
This is my first CNG vehicle, so I'm interested in the experience of the more experienced people here.
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