air vents
07-20-2009, 10:15 PM
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air vents
Is it possible to have to many air vents cut out in your canopy? I have a am avenger and I noticed when I was running it this weekend that when I ran it without the canopy it ran like a bat out of hell but when I put on the canopy it would run for about 100ft then stall. I remove the canopy and toss it in the water again and it runs fine. I'm guessing that if I richen it up a bit it would be fine but I think I might lose a little speed. I'm just wondering if cutting some vents would help. Any suggestions?
07-20-2009, 10:28 PM
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RE: air vents
if you have air scoops on your cowl you definately would need vents.
all the air going into your hull needs somewhere to go... and your engine can only swallow so much.
plus i think vents look cool too
all the air going into your hull needs somewhere to go... and your engine can only swallow so much.
plus i think vents look cool too
07-20-2009, 10:30 PM
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RE: air vents
Never to many providing they are able to introduce water to the carb. Cool air in and hot out is a good thing.
The canopy could be making the mixture rich(same as choking it some)in which case I would think leaning it a little would put the mixture closer to where it is without the canopy. I can see where you might believe with the air the vents provide you need more fuel to go with it. Probably not the case though. They usually do have more power without the canopy.
Get a fresh plug run it flat out then read the plug to get an idea what is needed.
The cool fresh air will always make more power.
Daniel
The canopy could be making the mixture rich(same as choking it some)in which case I would think leaning it a little would put the mixture closer to where it is without the canopy. I can see where you might believe with the air the vents provide you need more fuel to go with it. Probably not the case though. They usually do have more power without the canopy.
Get a fresh plug run it flat out then read the plug to get an idea what is needed.
The cool fresh air will always make more power.
Daniel
07-20-2009, 10:45 PM
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RE: air vents
i just remembered something i did when i was 10 or 12. i took the air filter off of my dads lawn mower and made a air scoop out of a milk cartonto fit over the carb
then got an air gun on the air compressor and shotair straight in there. if i put too much air in there all at once it would stall. but if i fed the air in nice and smooth it would rev its guts out
without touching the throttle. maybe same principle here? if its heat under the cowl it wouldnt be an on/off problem it would sart running progressively slower and slower. maybe try wrappine your exhaust with exhaust wrap my friend has it on his drift car. it works a treat. stopped his power steering fluid from boiling over. JM2$
then got an air gun on the air compressor and shotair straight in there. if i put too much air in there all at once it would stall. but if i fed the air in nice and smooth it would rev its guts out
without touching the throttle. maybe same principle here? if its heat under the cowl it wouldnt be an on/off problem it would sart running progressively slower and slower. maybe try wrappine your exhaust with exhaust wrap my friend has it on his drift car. it works a treat. stopped his power steering fluid from boiling over. JM2$
07-21-2009, 01:43 AM
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RE: air vents
ORIGINAL: sikR31
i just remembered something i did when i was 10 or 12. i took the air filter off of my dads lawn mower and made a air scoop out of a milk carton to fit over the carb
then got an air gun on the air compressor and shot air straight in there. if i put too much air in there all at once it would stall. but if i fed the air in nice and smooth it would rev its guts out
without touching the throttle. maybe same principle here? if its heat under the cowl it wouldnt be an on/off problem it would sart running progressively slower and slower. maybe try wrappine your exhaust with exhaust wrap my friend has it on his drift car. it works a treat. stopped his power steering fluid from boiling over. JM2$
i just remembered something i did when i was 10 or 12. i took the air filter off of my dads lawn mower and made a air scoop out of a milk carton to fit over the carb
then got an air gun on the air compressor and shot air straight in there. if i put too much air in there all at once it would stall. but if i fed the air in nice and smooth it would rev its guts out
without touching the throttle. maybe same principle here? if its heat under the cowl it wouldnt be an on/off problem it would sart running progressively slower and slower. maybe try wrappine your exhaust with exhaust wrap my friend has it on his drift car. it works a treat. stopped his power steering fluid from boiling over. JM2$
07-21-2009, 02:10 AM
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RE: air vents
yeah it would have been from lean out. fun though. colder air is denser than hot air.
thats why drag racers and such run faster at night/ lower temp. denser air = more oxygen in cylider = more hp.
I LIKE HP.
thats why drag racers and such run faster at night/ lower temp. denser air = more oxygen in cylider = more hp.
I LIKE HP.
07-21-2009, 07:11 AM
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RE: air vents
Peersi, not sure what pipe I'm running as I bought the boat used. Can you tell what kind it is by the pictures I posted?
SikR31, do you know who makes a cool set of vents and is one size better than another?
If I were to cut small slots on the back of the canopy maybe an inch long and have several would this help?
SikR31, do you know who makes a cool set of vents and is one size better than another?
If I were to cut small slots on the back of the canopy maybe an inch long and have several would this help?
07-23-2009, 12:10 AM
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RE: air vents
looking good dude... looks like it was meant to be there!
the toolmaking shop where i did my apprenticeship used to make tooling for louvre presses amongst other things
they would work perfectly.
the toolmaking shop where i did my apprenticeship used to make tooling for louvre presses amongst other things
they would work perfectly.
07-26-2009, 03:18 PM
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RE: air vents
If air was ment to leave the boat, why wouldn't the designers who add scoops to hatch do not add air exits?
At the end it also makes sense to me that if you take air in, you need to let it go for 2 reasons.
- If it can leave easy, it will enter more so more fresh air for the carb
- I also think excess air inside will cause somehow a parachute effect. And if exits are designed nicely, maybe it can also help the aerodynamics.
And still, why not already in the design of the hull makers?
At the end it also makes sense to me that if you take air in, you need to let it go for 2 reasons.
- If it can leave easy, it will enter more so more fresh air for the carb
- I also think excess air inside will cause somehow a parachute effect. And if exits are designed nicely, maybe it can also help the aerodynamics.
And still, why not already in the design of the hull makers?
07-26-2009, 03:26 PM
#19
RE: air vents
ORIGINAL: dicko
You want 3 times more air out than air in.
You want 3 times more air out than air in.
07-26-2009, 09:27 PM
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RE: air vents
How do you air out the boat without making your canopy look like swiss cheese? Why don't the makers of these hulls think of making replacement canopy with air vents strategically placed instead of users trying to guess where to put the vents. Why not a ram air kit? Make the air scoops functional, what I mean is a ram air kit similar to the one at this website but for boats. I used the one for a mustang just as an example.
http://www.kennebell.net/accessories...-93mustang.htm
http://www.kennebell.net/accessories...-93mustang.htm
07-27-2009, 08:00 AM
#21
RE: air vents
I designed the DaVette SS with the same size opening for air going in as I have going out and I havn't had any problems yet . Just make sure no floatation is in the way of the carb.
07-27-2009, 09:39 PM
#23
RE: air vents
It's in the back of the hatch . That's also the built-in handle for removing the hatch . I've never had any problems with the Zenoah 260 not getting enough air .
07-28-2009, 03:01 AM
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RE: air vents
ORIGINAL: Ron Olson
I've never personally agreed with that statement but what do I know? Two to one or 1:1 maybe as it seems to me that the engine would take care of a lot of incoming air. I'm not trying to start an argument or a huge discussion on it but I realize that you don't want trapped air in there either.
ORIGINAL: dicko
You want 3 times more air out than air in.
You want 3 times more air out than air in.
Cheers
Jason.