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Current Replies for Thru hull replacement size for scuppers and holding tank discharge
 
question Thru hull replacement size for scuppers and holding tank discharge (Lark)
Posted: 11:59:09 am on 5/2/2018 Modified: 1:45:14 pm on 5/6/2018
 
have C&C27 Mark III  (lark)

during haulout, plan to replace both thru hulls for scupper as well as thru hull for head discharge

is anyone aware of the sizing

look forward to your reply

Brad and Nancy Davies
C&C 27 Mk III Lark
Vancouver Rowing Club
Vancouver BC
  Re: Thru hull replacement size for scuppers and holding tank discharge (Van_Isle)
Posted: 12:11:41 pm on 5/6/2018 Modified: 9:25:07 pm on 5/10/2018
 
A short summary of what I did a few years ago: http://www.cc27association.com/f3/toast/toast.asp?sub=show&action=posts&fid=2&tid=8021

Note the reference to the flush-mount through-hulls. You'll most likely face the same thing.

Your best bet in my mind is to buy a $5 set of plastic calipers and measure the outside diameter of valve tailpieces and match-up the sizes that way. Who knows what's been done on your boat since it was built?  Just be careful that nobody has upsized anything and used reducers. I, for example, increased the diameter of the engine cooling water intake (to what my fuzzy memory can't recall). The reason being if I re-powered in the future to a diesel I'd probably need it. There is validity in sealing off the head discharge and re-plumbing the holding tank (I assume you have one) to suit.

1979 C&C 27 MkIII, Hull No. 780
Cygnet
North Saanich, BC



[For what it's worth, when I re-powered with a Yanmar 2YM15 diesel, the mechanic said that no intake upsizing was required from original, and so it has proved (I can shut the seacock down to less than 50% flow before the pyrometer starts to complain, tho' this probably is not true for boats in the southern US, where people have reported summer water temperatures in the 90-degree F range). The exhaust line, on the other hand, had to be significantly enlarged. - Admin]
  Re: Thru hull replacement size for scuppers and holding tank discharge (Lark)
Posted: 4:02:14 pm on 5/8/2018 Modified: Never
 
many thanks for your help

much appreciated

kind regards

Brad and Nancy Davies
C&C 27 Mk III Lark
Vancouver Rowing Club
Vancouver BC