Hello every one, got a "few"questions.. I googled so much my heads spinning I'm dealing with a 1977
Volvo penta md7a. As of now it the typical
raw water cooled. So far I bought a piggyback
pump to add on (10-241143-1 & 10-35157-1) f35b. I'm converting it to fresh
water cooled. they used to make conversion kits and I think
Volvo even
sold some fresh
water cooled. however I think the exchangers are sized for use with a pto
pump off the fly
wheel jabsco (possibly 5281 or 3760) and some
electric pump kits as well. I tried to track down the flow rates of both pumps to no avail,and even if I knew them I wouldn't know how to size the exchangers accordingly ( I don't even know how the exchangers are sized other then length width and number of tubes, I was thinking more in terms of
cooling capacity) I was wondering if any one has a
motor with the piggy back pump and if so what size exchanger they use? Or if any one knew the
cooling requirements I could specify if I ordered one?I guess an exchanger with a relief cap and over flow hose would simplify things and save space? I also had a few other questions ; if I go with the copper nickel does the heat conductivity difference affect the siz I'll need? More the likely I'll be mounting the exchanger off the bulkhead ( I can't seem to find the
motor mount brackets) does the horizontal or vertical xchanger have an advantage over the other? When I do mount it I assume I'll want it level with the top of the motor?. Does any one have a piggyback pump set up? I'm new to
marine diesels, but the correct exchangers for the md7a seem so small I wouldn't think they would xfer enough heat to cool the motor, the again I'm new to this. Another thing there's a popular bidding site that has Chinese exchangers listed claiming they're copper nickel etc. for much less then the manufacturers....tempting..any how sorry for the 100 & 1 questions any insight would be appreciated.