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Old 21 November 2015, 18:19   #11
Pete7's Avatar
Country: UK - England
Town: Gosport
Boat name: April Lass
Make: Moody 31
Length: 9m +
Join Date: Aug 2001
Posts: 4,837
Originally Posted by beamishken View Post
Isn't that a standard set up in the later pac's? The yanmar usually comes with a zf/ hurth box but the military spec some strange stuff or possibly buy the engines bobtail & fit the origional box during re powers
The early P22s had a Mermaid turbo Four with BW 72 box and sternpower 101 leg. The Mk2 has jets. In between well when you walked around Halmatic when they were building boats there was always a series of odd looking development ribs which you weren't allowed to photo graph, even for those of us serving at the time.

Ribnet is best viewed on a computer of some sort
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Old 22 November 2015, 02:52   #12
M.Thornton's Avatar
Country: UK - England
Town: blackpool
Boat name: Fast Forward
Make: Scorpion
Length: 8m +
Engine: 315 Yanmar
Join Date: Aug 2006
Posts: 298
Try dropping your trim- tabs half way to lift your stern when you set off

It looks massive on the trailer,but tiny in a big sea!
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Old 26 November 2015, 16:40   #13
Country: UK - Scotland
Town: Canonbie
Boat name: Allen
Make: Halmatic
Length: 6m +
Engine: inboard diesel 240hp
Join Date: Nov 2015
Posts: 3
everyone, the hull is immaculate, once turbo finally kicks in it quite happily tears away to 3400, was tracked doing 34 knots plus, these ribs are all ex military and the gearboxes and sterndrives are what they came with, the engines were a later addition when swapped from the 24v model yanmars. Exhaust system is clean, not sure when intercoolers were last cleaned as i have no history at all on this boat, just after a few pointers on what to try next, about to put another sterndrive on as suspect could be wrong gearset, not a new one the boss bought a spare one at the same time.
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Old 27 November 2015, 01:56   #14
Country: UK - Scotland
Town: north ayrshire
Boat name: charlie girl
Make: reiver 3.8/regal3760
Length: 10m +
Engine: 40hp 2st 2x6lp 315
Join Date: Jul 2009
Posts: 982
3400 is the max rpm for the engine so your not too far away on overall final drive should be propped to about 3550 max (but never ran at over 3400) & the standard tach is notorious for over reading so you may be slightly over propped or possibly a little down on power overall.
Personally my next step would be strip intercooler and clean air and water sides then try again & double check rpm with a shop tach. Also worth doing a high idle test to check governor setting. It's no good trying to increase max rpm if it's governed to 3400
Obviously if you have a lower ratio drive to swap over then that gives the same result as reducing prop pitch

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