Drilling under a vent

Author Topic: Drilling prop vent holes jgkmmoore posted 09-11-2006 08:36 PM ET (US) I have a 13x19 SS Johnson prop on a 1982 John 140. Need to drill the vent holes to increase holeshot for water skiing.Somewhere, there exists a diagram with the hole size and location to drill. Anyone have it, or know where it is? May even have been an OMC Service Bulletin, but I can't find it.

Best Regards-Jeff Moore

The Judge posted 09-12-2006 12:08 PM ET (US) I usually fill in the holes. It does not do that much and not worth ruining a prop. That is some thick azzes SS and will need a drill press, etc. Buy a 17" for skiing. anthonylisske posted 09-13-2006 11:42 AM ET (US) Won't the vent holes decrease the holeshot? you are adding cavitation in front of the blades rather than out the back.

I don't want to question your logic, but figured you may want the information.

John from IL posted 09-13-2006 12:02 PM ET (US) It was OMC service bulletin...
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Running a dryer vent underneath a deck is one solution when the exterior vent is in the immediate area of the dryer vent. There are a few reasons that you will want to consider doing this: preventing lint buildup, preventing moisture buildup on the wood (which can result in mold and mildewing of the wood), and avoiding damage to the wood due to these two.

This is a reasonable option when relocating the dryer vent is not a viable option. Relocating the vent can be difficult, and will require work to the exterior of the home. Optimally, the dryer should be vented by the most direct route, and manufacturers have recommendations one the maximum distance a dryer vent should be located. Overly extending this distance will increase the risk of lint buildup in the dryer vent (increasing the fire hazard) and will decrease the efficiency of the machine. Here is what you will need to complete the job:

Step 1- Assemble Vent Pipe

Measure the needed length of vent...

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Vent exhaust fans through a roof hood

Roof vent hood details

The best exhaust fan venting is through smooth, rigid ducts with taped joints and screwed to a special vent hood. Although this isn’t always possible in attic crawl spaces, you should always insulate the duct to prevent condensation problems. You can find 4-in. duct already wrapped in insulation at home centers.

If you’re tempted to vent your exhaust fan through an existing roof vent, or even vent it into the attic, don’t do it. First, you’ll partially block your roof vent with the piping, reducing the flow of cooling air through your attic. Second, during cold winters, you’ll be blowing warm, moist air onto a cold surface (the roof vent and roof plywood). The water will condense and drip into the insulation below and perhaps into the house. Special bathroom fan roof vents with an internal damper that opens only when the fan is blowing will send moist air outdoors and keep cold air out of the...

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This consolidation is current to December 31, 2017.
See “Amendments Not in Force” for amendments
effective after December 31, 2017.Link to consolidated regulation (PDF)Link to Point in Time

Oil and Gas Activities Act

[includes amendments up to B.C. Reg. 146/2017, June 1, 2017]

Part 1 — Definitions


1 In this regulation:

"abandon", in relation to a well, means permanently to plug the well in accordance with Part 5;

"Act" means the Oil and Gas Activities Act;

"annual gas allowable" means, for any production period, the volume of natural gas determined by multiplying the daily gas allowable by either

(a) the number of days from November 1 to October 31 inclusive, or

(b) in the initial production year, the number of days from the date production began to October 31 inclusive;

"ASME" means the American Society of Mechanical Engineers;

"ASME Standard B31.3"...

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I have been slowly growing my business for about 4 years and am just now buying a combustion analyzer. I know that you guys are probably going to tear me up and call me a hack for not owning one yet, but I've been accumulating other tools and figured I could get by with timing the meter and some other measurements. So, when you're done with any insults you want to toss out there could you tell me how you are getting flue gas analysis on systems with B-Vent? Or for that matter, how about the 90 plus systems? I don't want to breach the integrity of the vents. Drilling holes in B-vent is no problem. If you need, we have letters on file from several B-vent manufacturers stating there is no problem.

I've always drilled the plastic pipe on 90+ equipment (and sealed the hole after testing) - if you don't want to drill it and it is sidewall vented, just take the sample from outside.

There is alot of info regarding combustion testing on our application website...

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