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Hi Bruce, I hope they work OK. You have a couple of BHP more than me and a new installation so the 12x 8 sound good. Something I did not mention in my earlier post came to light when I had terrible black smoking and lack of power recently. After some exhaustiive( pun intended) tests and new injectors I found that the exhaust elbow near the water injection point was almost completely blocked with concretion. A new elbow cured the problem and gave more thrust to enable the folders to work a bit better in astern. Had I still had three bladers on it is likely I would have revved higher or indeed pulled the larger size you are looking at.
Let me know how you get on,
Regards,
Pete
