Guys, they are in no way shape or form meant to be "Air Filters"....they won't filter anything smaller than pea gravel. Their sole purpose is to quench hot escaping gasses and cool them if a backfire through the carbs were to occur. This could be dangerous if the engine compartment was full of gas fumes and a backfire occured.....BOOM!!!
I wanted to back up my statement, so here is some info I dug up:
quote:Backfire flame arrestors serve a very important safety function. All gasoline engines with carburetors tend to vent fuel vapor after shutdown. If shut down from high speed, they are hot and will boil off some of the fuel in the float bowl. This vapor goes into the engine compartment and will linger for a while unless taken out by the ventilation blower. The vapor itself does not harm, as long as there is no source of ignition present. Sources of ignition can be electrical or from a backfire in the engine intake system when it is restarted. Most of us have heard a backfire. On a boat, flames spouting out of the carburetor can ignite that fuel vapor in the engine compartment.
The operating principle of the flame arrester is to cool and quench the flame front by forcing it to pass between some closely spaced metal elements that act as a heat sink. Since the engine must take in air without too much restriction, many elements are required with many small spaces between, hence the typical arrester design of a circular shape that is six or more inches in diameter and an inch or more in height. Some form of delayed or late ignition takes place in one of the cylinders at a time when the intake valve is open and the resulting flame ignites the fuel and air vapor in the intake manifold. The pressure created has to go somewhere, and that's back out through the carburetor or intake system. With a working flame arrester, only the pressure is released and none of the flame gets out
Not really. That's why I deleted mine. I thought you guys were talking about pre-filters. I have those on mine which act as a filter for debris. They work great.
Yeh, I have those too, but they cost me about 60 RPM's when I use them. I thought they were mostly for keeping water out, so I keep them on but pulled all the way up incase I need to use them in really rough water conditions.
K&N does offer a Flame Arrester that filters the air, but most marine types you see on PWC's like the PROK's, and the stock ones are just plain flame arresters.
Posts: 186 | Location: Houston | Registered: May 29, 2002
you should be able to gain some of those 60rpms back by tuning your carb's in with them on. What I've found is my ski runs really lean without the pre-filters on.
quote:Originally posted by Frewman: you should be able to gain some of those 60rpms back by tuning your carb's in with them on. What I've found is my ski runs really lean without the pre-filters on.
I have CV carbs, there are no adjustments on them....the plug chops are perfect with the socks removed....so I run without them....
Posts: 186 | Location: Houston | Registered: May 29, 2002
LSU, Get those Keihns rejetted, t-handles installed (yes there are highs and lows, just hard to find), add primer kit/ditch choke plates) and really tune in the Ultra 150. TD
quote:Originally posted by GPR cop: LSU, Get those Keihns rejetted, t-handles installed (yes there are highs and lows, just hard to find), add primer kit/ditch choke plates) and really tune in the Ultra 150. TD
TD,
They have been rejetted 2 sizes over, but I've been told there are NO high speed adjusment screws and have been told this by many tuners. I have the primer kit in my garage but have had mixed reviews on running the carbs without the choke plates, so I haven't installed it yet......what's your experience and where are these mystery adjustment screws?????
Thanks bro....
Posts: 186 | Location: Houston | Registered: May 29, 2002
RIVA Performance Forums ![[Confused]](confused.gif)
![[Cool]](cool.gif)
