Why is this page here and not on the WOA website?Recently the Westsail Owners' Association website was moved to a new server that would allow the site to be more easily updated and maintained. While the basic content was successfuly transferred into the new site, a new Forum was started from scratch and the old Forum was converted to a collection of 41 PDF documents.
Most of the Westsails are somewhere around 35 years old. They were well-built boats and most of the boats that were built are still sailing today... many half way 'round the world. But like all classic sailboats, they will all have problems over time, and most of the problems are relatively similar from boat to boat. There's a fair degree of likelihood that any problem that might come up has already been tackled by another owner. It's also fairly likely that the solution is buried somewhere in the archives of the Forum.
Long ago, I started downloading and archiving the entire Westsail.org website, with periodic refreshes. I did this mainly because I wanted a localized version of the site that I could access while cruising remote corners of the world, with limited access to the Internet. Perhaps the biggest benefit, however, has been the major improvement in my ability to search more than 11,000 posts efficiently.
It's likely that the old forum data could have been integrated with the new application, creating one contiguous and searchable source of information. But this would have required substantial programming and data manipulation and the decision was made by the WOA to take the current course. I therefore created this application as a means to preserve the seven years worth of resources that I consider to be incredibly valuable information for current and future Westsail owners. I hope you find it as useful as I have.
1975 Westsail 32, Hull #438
Thread: "Perkins 108 Cruising Speed"
12,268 posts on 2,444 threads • From Mar 07, 2004 - Jan 08, 2012
How to Make an Effective Search
Primary Settings and Expectations
- Search "How" - There are two basic ways to make a search for content on this site and the methods will typically give you very different results.
- Search "Which" - You can modify your search results by determining whether or not all words in your search string must appear in the result set.
- Search "Where" - Determine which sections of the messages contain your search string.
- Search "What" - This is where you must enter the word or words you wish to find.
- Simply enter the word or words you want to find into the box, separating the words by single spaces.
Additional Settings & Notes
- Capitalization - All searches are performed in a case-insensitive manor. As such, proper capitalization is not a requirement for any match to be successful.
- Punctuation - All non-alphanumeric characters (excluding spaces) are removed from the string, prior to the search. Also, the search is performed against a special search record which has been treated similarly. This assures that items are not omitted due to differences in punctuation, etc.
- Special Terms - There are special situations where non-punctuation searches are not productive. Take the example of a search for Perkins 4-108. This phrase would actually not be found because one of the resulting words ("4") is only a single character in length. Therefore, the search is also performed against the entire phrase at the same time. This example is somewhat special in its own right, because the phrase is sometimes found as Perkins 4.108 and sometimes as Perkins 4-108. It would be beneficial, therefor, to search it both ways.
- Partial Words - In order to maximize efficiency, the search engine was designed to search partial words as well. For example, if you try to find information on anchoring but don't get sufficient results, you can simply search on the word anchor. This will return results for anchoring as well.
- "Stop Words" - Google, like most other search sites, does not consider extremely common words when executing a search. This practice speeds up searching and reduces unintentional matches. These filtered words are known as stop words. While the list changes from time to time, there are currently over 650 such "Stop Words". The Westsail.info site follows the same practice when performing a string search, but performst the search as entered in a phrase search.
- Start Broad - For best results, start your searches very broad (only the most important key words) and add additional words to reduce results. If you are searching for something very specific, change the setting from Words to Phrase.
Perkins 108 Cruising Speed
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, Sounds like the problem may be the incorrect prop pitch. Also, the 80 percent number is the correct one to use when you have the correct prop. I will email you the page from my Westsail Service Manual regarding engine and boat speeds.
1800 RPM is the speed my boat's PO recommended as top cruising speed... at that RPM I can get between 5 and 6 knots with my Volvo MD11C. So, with the same hull and same RPM you should be able to do as well... I have a fixed three bladed prop, but don't know what the pitch is.
As an aside, my boat's PO put in an oversized heat exchanger and I always run under 200 degrees (assuming my temp guage is working!).
Frank Butler (Guest)
I can run the 4-108 in Intuition W32 #0825 @ 2400 RPM continuously without overheating. Usually pushes her along at about 5 kts. I can redline her for about 20 minutes before getting excited about overheating. In addition to checking the prop pitch, you might consider having the heat exchanger cleaned. Don't forget to replace the zinc in the heat exchanger.