Keith Fry
Member
It seems that the Duchess has complete compression loss in one cylinder which the mechanic considers that is most likely due to an ineffective valve. We will know more when the heads are off.
If this is the case it would seem appropriate to change from P6 heads to SD1 heads if I have to have replacement or overhauled heads. My understanding is that SD1 heads have larger inlet valves with improved gas flow and therefore are more efficient.
This was a change I was considering, but had rejected on the basis of "if it ain't broke, don't fix it" . However it would seem may well be broke and so the SD1 fix would seem the best way forward.
Does anyone have any comments on my thinking? Thank you in advance.
If this is the case it would seem appropriate to change from P6 heads to SD1 heads if I have to have replacement or overhauled heads. My understanding is that SD1 heads have larger inlet valves with improved gas flow and therefore are more efficient.
This was a change I was considering, but had rejected on the basis of "if it ain't broke, don't fix it" . However it would seem may well be broke and so the SD1 fix would seem the best way forward.
Does anyone have any comments on my thinking? Thank you in advance.