I would caution against the use of J-tubes/ inverted orifice vents in any carbureted application. With the J-tube extending into the airstream, as air speed increases into the body, pressure at the inverted opening decreases. The pressure drop is transferred to the surface of the working fluid in the bowl. Proper fuel metering is dependent upon the correct differential at the bowl vs. the opening at the jet. The imbalance can result in incorrect mixture distribution. Ideally you would have the pressure at the working fluid (vent tube) stable relative to atmospheric allowing the jet orifice size to properly meter the fuel dependent upon the pressure drop in the venturi. The use of the J-tube can potentially result in a top end lean condition.
If you have concerns regarding issues with the CG or insurance carrier the balance tube pictured below may be a preferred option.

Bob

LMFAO.... thanks for finally being politically incorrect. :evilb: I hear ya bro.







Mariah212z , what Haxby is trying to say is "WE ALL" need to get our panties out of a wad at times and enjoy life. Im glad to hear that you run your blower everytime before startup and probably do a safety checklist and ETC. Great man, it works for you. I ve seen your posts since you joined recently and you come off at times as a know it all. Just dont read into things as much as your trying to do and if you dont agree with someone, then so be it. There is no need to convert everyone to your method of thinking.

PS. I do run my blower and my carbs on my HP500's are marine versions..... :eek:

haxbyspeed,
being from vancouver,do you know if there are differences between canada ans u.s. cg requirements?

That's how we do our's too.. :drink:


And yes pqjack there are some differences but generally if you follow USCG req's you'll meet or exceed Canadian. Except life jackets.

Chiming in a little later here.... my mild 540 made 578 @5800 with my old holley 750.

Just curious Haxby, what's different about the life jackets?
Eddie

I did some digging and found this

"My US purchased boat came with 8 USCG approved PFD that became non-approved the minute the boat came under Canadian registry in Canadian waters. I called the CCG, plus the Transportation Industry Ministry with the Mfg number to see if there was a corresponding CCG number that I could obtain. No such luck although the USCG and CCG approved ones are made by the same Mfg and are exactly the same.

Since the requirements say they have to be on board (does not say worn all the time) I bought a bag of CCG approved PFD and keep them on board. Stupid as it is the CCG approved ones I bought are of a lesser quality, i.e. provide less buoyancy than the USCG ones that came with the boat ! If we ever need to put them on, you can bet that everybody on board will don the USCG approved ones."

Here is a link to the canadian water authority

http://www.tc.gc.ca/eng/marinesafety...-menu-1692.htm

Sounds to me like USCG and Canada approved can be the same jacket but you need the offical "stamp of approval" on it from the respected country you are in

Yep, it's crazy. A customer brought home a Schiada from Cali and went for a spin with some buddies. They got pulled over and even though they had 4 life jackets for the 4 guys on board only one was Canadian approved. The officer proceeded to write them a ticket for the other three jackets. When the owner complained about the officer not having anything better to do, the officer said "If you knew how many bodies we pull out of the water every year you'd understand why I'm giving you this ticket". The owner responded with "ya, and how many of those bodies were wearing USCG approved life jacket?!" Still got the fine..

I don't know about the rest of Canada... but in B.C. there is currently no law on the books stating you have to stop for police on the water..

Sounds like everybody wants to be sure to get a piece of the pie.......or the whole pie.

That is rediculous....