19-02-2024, 09:08 AM
An update:
My good friend Graham Barker kindly brought his 37 Ruby so that we could compare engine noise levels from our cars.
Both engines were well warm and were idled at about the same rate. I measured the noise using my uncalibrated phone microphone app and held it exactly a half meter from the manifold side with the bonnet open.
The results were:
RP 83dB Ruby 81.5dB. I assume these are dBA measurements, but it does not really matter being just a rough relative test. This means that there was almost half as much extra noise coming from my RP. At these high noise levels the ambient noise had no affect on the results. Our subjective decision before the test was that my RP was a bit louder and sounded a bit harsher.
So time will tell if I have tappet issues.
My good friend Graham Barker kindly brought his 37 Ruby so that we could compare engine noise levels from our cars.
Both engines were well warm and were idled at about the same rate. I measured the noise using my uncalibrated phone microphone app and held it exactly a half meter from the manifold side with the bonnet open.
The results were:
RP 83dB Ruby 81.5dB. I assume these are dBA measurements, but it does not really matter being just a rough relative test. This means that there was almost half as much extra noise coming from my RP. At these high noise levels the ambient noise had no affect on the results. Our subjective decision before the test was that my RP was a bit louder and sounded a bit harsher.
So time will tell if I have tappet issues.
Slowly rebuilding a '34 RP