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Forum: Drive Train / Propellers 06-01-2011, 04:50 PM
Replies: 35
Views: 8,734
Posted By jacques debauche
To Lock or Lock Redux

Since posting my reply several minutes ago, I have looked at the drag experiment on the provided link. One can't argue with the numbers - the free-wheeling three-bladed prop has less drag than the...
Forum: Drive Train / Propellers 06-01-2011, 04:14 PM
Replies: 35
Views: 8,734
Posted By jacques debauche
To Lock or Not Lock

While it may defy conventional knowledge, a freewheeling propellor creates more drag than a locked one. When we race our Tartan 30, which has a two bladed prop tucked close behind the keel, we put...
Forum: Good Guys 06-01-2011, 10:01 AM
Replies: 12
Views: 11,242
Posted By jacques debauche
Wrenches

The wrenches needed for the A4 are properly called "SAE" (for Society of Automotive Engineers) not "Imperial" (except maybe in the UK). Asking for a set of "Imperial" wrenches might get you a set of...
Forum: General Maintenance 05-31-2011, 10:49 AM
Replies: 33
Views: 96,089
Posted By jacques debauche
Hot Section Insulation

I'm surprised at the angst about finding appropriate insulation for exhaust hot sections. MMI sells just the thing - give Don and Brenda some business in appreciation for their services to us...
Forum: Fuel System 05-26-2011, 10:39 AM
Replies: 6
Views: 3,619
Posted By jacques debauche
Question Oil Pressure Switch Mounting

The oil pressure switch on our A4 has failed after only one short season of operation, and before installing a replacement I would like to solicit advice on mounting it to reduce chances of another...
Forum: Ignition System 05-26-2011, 10:10 AM
Replies: 17
Views: 12,560
Posted By jacques debauche
Smile Runs, Stops, Starts, Runs, Stops, Cured

Yesterday I finally got to the boat, and isolated the cause in about five minutes. Yes, it was a faulty oil pressure switch. Although I had previously jumpered the switch, evidently my crocodile...
Forum: Ignition System 05-19-2011, 02:21 PM
Replies: 17
Views: 12,560
Posted By jacques debauche
Float valve

Interesting suggestion about the float valve. In a previous boat I had a float valve that would stick even with 3 psi fuel pressure on it. And as you say, the engine would run a few minutes before...
Forum: Ignition System 05-19-2011, 11:25 AM
Replies: 17
Views: 12,560
Posted By jacques debauche
Not fuel pump

The possibilty of the fuel pump cutting out because the oil pressure switch opens was considered, although that would be unlikely to cause such an abrupt shutdown. However, just to make sure, I...
Forum: Ignition System 05-18-2011, 09:39 PM
Replies: 17
Views: 12,560
Posted By jacques debauche
Good suggestion - I've always been a little...

Good suggestion - I've always been a little nervous about that groove filed into the distributor cap to accespt the solid state ignition module wires.
Forum: Ignition System 05-18-2011, 08:48 PM
Replies: 17
Views: 12,560
Posted By jacques debauche
Unhappy Runs great, then shuts off, then runs great

Our A4 has been running like a charm until last week. Restarting after a race, the A4 caught immediately and ran perfectly for about three minutes. It then shut down instantly (as though the...
Forum: Cooling System 06-23-2010, 09:53 AM
Replies: 46
Views: 15,169
Posted By jacques debauche
Water Pump

Check the outlet port of the pump for bits of a previous impeller - they can get wedged in there pretty tight and block flow completely. Don't ask how I know.

If your water pump is as...
Forum: Fuel System 06-22-2010, 10:19 PM
Replies: 8
Views: 11,305
Posted By jacques debauche
New Carburetor

I agree 100% - get a new carburetor, then rebuild the old one as a learning exercise, and if it works out OK, as a spare. As a a favor to the website, could you reduce the size of pictures attached...
Forum: Ignition System 06-22-2010, 09:38 PM
Replies: 11
Views: 9,944
Posted By jacques debauche
Squeeze bulb

If you put a squeeze bulb in the fuel line, don't let the Coast Guard or any marine surveyors see it: it is very illegal as well as being unsafe. While we are at it, the same goes for any...
Forum: Polls 06-21-2010, 05:12 PM
Replies: 84
Views: 67,103
Posted By jacques debauche
Blower

In our Tartan 30 the exhaust system is in the space between the midship bulkhead and the head cabinetry. Even though the "hot" piping is reasonably well insulated, we keep the exhaust fan "on" to...
Forum: Safety 06-17-2010, 10:57 AM
Replies: 47
Views: 57,632
Posted By jacques debauche
MMO treatment of impellers

Since reading about it several days ago, I have been troubled by the implications of soaking water pump impellers in MMO before installation. Presumably the intention is to make them more flexible,...
Forum: Safety 06-16-2010, 11:39 AM
Replies: 47
Views: 57,632
Posted By jacques debauche
Spelunking

Spelunking: The hobby or practice of exploring caves (English)
Forum: Safety 06-14-2010, 05:41 PM
Replies: 47
Views: 57,632
Posted By jacques debauche
Impeller replacement

We replace the impeller every two years simply because the things get tired. However, having a boat in which the water pump can actually be seen, and even worked on from a comfortable chair, and...
Forum: Troubleshooting 06-14-2010, 10:34 AM
Replies: 13
Views: 20,478
Posted By jacques debauche
No restart

The next time this happens, pull the lowest sparkplug (#4) and see if it has water on it. I had the same symptoms as you are experiencing, and it turned out that water was getting into the manifold...
Forum: Troubleshooting 06-10-2010, 11:12 PM
Replies: 25
Views: 8,168
Posted By jacques debauche
MJB Control

Darn! At least I didn't pay the West Marine price - $529!!!!
Forum: Cooling System 06-10-2010, 06:08 PM
Replies: 43
Views: 9,111
Posted By jacques debauche
Hose sizes

I agree 100% that every component in the flow loop affects flow rate, and I never suggested otherwise. However, my point was (and is) that when you look at the quantitative effects of hose size (and...
Forum: Cooling System 06-10-2010, 04:04 PM
Replies: 43
Views: 9,111
Posted By jacques debauche
Hose sizes

I agree with ndutton 100% - the hose sizes are as he states, at least in any installations I've seen. For discussion I quoted the sizes which this thread started with.

My point was (and is) that,...
Forum: Troubleshooting 06-10-2010, 02:14 PM
Replies: 25
Views: 8,168
Posted By jacques debauche
Single shifter

My reference to "single lever shifter" seems to have been misinterpreted. By "single lever" I mean a control which has only one handle, but has two functions (transmission and the throttle). There...
Forum: Cooling System 06-10-2010, 01:49 PM
Replies: 43
Views: 9,111
Posted By jacques debauche
Post Cooling hose size

Back to the original question, namely the effect of cross-sectional area on flow. Consider the case presented, namely 3/8" versus 3/4" hose. For simplicity let's say that 3/8" and 3/4" are the...
Forum: Tartan 06-07-2010, 08:45 PM
Replies: 8
Views: 13,935
Posted By jacques debauche
Tratan 30 Standpipe

I "misspoke" concerning the routing of the cooling water hose. In the original layout it did not go from the anti-siphon fitting to the lift box as I accidently said, but to the injection point at...
Forum: Troubleshooting 06-07-2010, 08:39 PM
Replies: 25
Views: 8,168
Posted By jacques debauche
Single lever controls

I trashed the single-lever control which I removed, but looking at pictures in current e-catalogs, I suspect it was made by Teleflex-Morse (as was the two-lever control I replaced it with). Uflex...
Showing results 1 to 25 of 38

 
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