Westsail Owners Alliance - Post: "Perkins 108 Cruising Speed"
Westsail Westsail Owners Affiliation
 Important information about this site! 

Post: "Perkins 108 Cruising Speed"

12,268 posts on 2,444 threads   •   From Mar 07, 2004 - Jan 08, 2012


Text Strings  

Full Phrase  


All Words  

Any Word  


Message Text

Text & Author  

Message Author Message Content   (1 of 1)
- Archived Message from Inactive Forum -

Dick and Libby Mills

I've only owned Tarwathie, my Westsail 32, for a few months, so I'm still learning her "normal" characteristics. While she sails beautifully, I'm frustrated by her performance under power with the Perkins 108.

I can only sustain 1800 RPM continuously without exceeding 220 degrees coolant temperature. I get 1 knot per 1000 RPM, so my top cruising speed under power is 3.8 knots. In costal waters with strong tidal currents, that's unsafe.

I've hired two mechanics and we've been through everything in the raw water and primary coolant sides. We cleaned, backflushed, replaced impellers and removed the thermostat. Still the problem persists.

I talked with a Perkins engineer. He said that a tip-top condition coolind system should allow cruising speed at 80% of full-throttle RPM. For me that would mean 2,500 RPM. I'm surprised by the 80% number. Why isn't it 100%? I never owned an engine before with performance limited by the cooling system.

What I lack most is a calibration point.

What do other Westsail 32/Perkins 108 owners achieve for cruising RPM and speed?

Has anyone else experienced problems similar to mine?

Has anyone tried modifying the Perkins with an oversized heat exchanger?

Any information would be appreciated.

Dick Mills

Showing record #1 of 1 matching record

Showing record #1 of 1 matching record

  Forum Archive Home    Back to Previous Page   Show Posts w/ Images   Windbag Newsletter 
This site is provided as service to Westsail Owners by Jack Webb on Westsail 32, Hull #438, at http://HighSeasDrifter.net,
This site is provided as service to Westsail Owners by  Jack Webb (s/v Drifter, Westsail 32, Hull #438)