Post by fury on Dec 21, 2018 7:59:18 GMT -5
Hi everyone, first post here. I have been reading a few old posts regarding the old 2.2 S2 Perkins based 200 series engine, which I own, as a marine power plant, in an old 36 foot timber boat / cruiser.
I am based in Australia ( so please don't hold that against me... lol ) but looking at some of the posts, they are packed with info!
I do realize that parts are scarce, my engine is a bit tired, but runs well, but although it will run all day at low revs and low power, starts overheating as the propeller is not matched to the power or torque. It only develops around 2000 rpm flat out and quickly rises from normal temp at around 1800 rpm @ 83 degrees Celsius to just under 100 deg C, very quickly, so I back off quick and returns to normal ( down to 16 or 17 to cool , then back to 1800).
It is considered to be "over propped", but the calculations were done by a professional, that blamed the fact that he didn't have a power curve chart for the calculations. Thus, it is only developing 1/2 the available rev range at best. other than throwing a selection of smaller propellers at the problem, (which would involve around $1500 a guess) would like to make a more educated approach this time
It blows a little blue smoke on startup, but blows virtually no smoke while running.
Im guessing its only developing around 25hp or less at these revs.
I want to match the propeller to the power, using the "alter pitch and diameter" rules , but I can only change the pitch by around 2 degrees and cut down by 2" dia maximum. this should increase the rev range by around 600 rpm. my gearbox is a 2:1 so prop is spinning at 1/2 the rpm
I do have a small turbo, not fitted, but really wary about installing it, I would need to install an inter-cooler as well if I did, and only limited boost, to hopefully lower the torque curve down a little.
I have searched for Westerbeak marine bits, like the piston oil sprayer without luck, not sure what else to do.
BTW it is freshwater cooled via a new heat exchanger
Thoughts please gentlemen ... thanks in advance
I am based in Australia ( so please don't hold that against me... lol ) but looking at some of the posts, they are packed with info!
I do realize that parts are scarce, my engine is a bit tired, but runs well, but although it will run all day at low revs and low power, starts overheating as the propeller is not matched to the power or torque. It only develops around 2000 rpm flat out and quickly rises from normal temp at around 1800 rpm @ 83 degrees Celsius to just under 100 deg C, very quickly, so I back off quick and returns to normal ( down to 16 or 17 to cool , then back to 1800).
It is considered to be "over propped", but the calculations were done by a professional, that blamed the fact that he didn't have a power curve chart for the calculations. Thus, it is only developing 1/2 the available rev range at best. other than throwing a selection of smaller propellers at the problem, (which would involve around $1500 a guess) would like to make a more educated approach this time
It blows a little blue smoke on startup, but blows virtually no smoke while running.
Im guessing its only developing around 25hp or less at these revs.
I want to match the propeller to the power, using the "alter pitch and diameter" rules , but I can only change the pitch by around 2 degrees and cut down by 2" dia maximum. this should increase the rev range by around 600 rpm. my gearbox is a 2:1 so prop is spinning at 1/2 the rpm
I do have a small turbo, not fitted, but really wary about installing it, I would need to install an inter-cooler as well if I did, and only limited boost, to hopefully lower the torque curve down a little.
I have searched for Westerbeak marine bits, like the piston oil sprayer without luck, not sure what else to do.
BTW it is freshwater cooled via a new heat exchanger
Thoughts please gentlemen ... thanks in advance
