Rotax Air Filter
- Wes
- Premium Member
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- Joined: Mon Jan 23, 2006 10:32 pm
- Location: Satellite Bch, Florida
Rotax Air Filter
ALL,
Just looking for experience on Air Filters for the Rotax.
Since it looks like I won't be using the Rotax intake box, cause it won't fit!
The filters I see on most installations are the cone shaped K&N (don't know the P/N) and the clearance between the fire wall is pretty tight, at least on the left side.
When I ordered the firewall foreward package form Just, they sent the K&N filters (P/N SP-2706) shown in the photo that are a whole lot shorter than the cone shaped ones. It would seem these flatter filters would be better (more firewall clearance). They called and said they sent me the wrong filters, but right now I don't see the problem with them.
Anybody have any objections?
Wes
Kit #95
Just looking for experience on Air Filters for the Rotax.
Since it looks like I won't be using the Rotax intake box, cause it won't fit!
The filters I see on most installations are the cone shaped K&N (don't know the P/N) and the clearance between the fire wall is pretty tight, at least on the left side.
When I ordered the firewall foreward package form Just, they sent the K&N filters (P/N SP-2706) shown in the photo that are a whole lot shorter than the cone shaped ones. It would seem these flatter filters would be better (more firewall clearance). They called and said they sent me the wrong filters, but right now I don't see the problem with them.
Anybody have any objections?
Wes
Kit #95
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Kit # 95
Low and Slow - The only way to go!
Low and Slow - The only way to go!
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Wes,
No objections but I can share some insight on sizing K&N's (and other filters).
On all carbureted normally aspirated engines, there is a "stand off" of fuel mixed air that occurs just outside air intake to the carb. This stand off is approximately the same distance away from the carb as the diameter of the carb opening. If you interrupt this stand off it disrupts the air flow thru the carb, reduces flow, and bottom line eats HP. Due to this event the filter should stand off the carb at least the diameter of the carb intake. On many installations clearance makes this impossible. One of the many compromises we make building these machines.
FWIW,
Dan 082
No objections but I can share some insight on sizing K&N's (and other filters).
On all carbureted normally aspirated engines, there is a "stand off" of fuel mixed air that occurs just outside air intake to the carb. This stand off is approximately the same distance away from the carb as the diameter of the carb opening. If you interrupt this stand off it disrupts the air flow thru the carb, reduces flow, and bottom line eats HP. Due to this event the filter should stand off the carb at least the diameter of the carb intake. On many installations clearance makes this impossible. One of the many compromises we make building these machines.
FWIW,
Dan 082
- scubarider2
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- Location: Cleveland, GA
right
Dave is right. The oil tank will not fit where "most" install it which is in the middle on the firewall. I would suggest getting the two cone shaped filters. I am sure Just will send them to you. Worth the wait.
Dennis
Dennis
- Wes
- Premium Member
- Posts: 231
- Joined: Mon Jan 23, 2006 10:32 pm
- Location: Satellite Bch, Florida
Filters
OK,
I did some more mockup stuff and as shown in the pics, the clearances from filters looks OK.
I did Dave's measure of 7 1/8 from the left carb lip to an imaginary firewall and it looks tight, but do-able.
I also checked the carb inlet diameter(~ 1 3/4 in) and there is about 2 in of open area inside these flat filters.
So right now I don't see a problem.
How do you like my Tupperware tank mount?
Did everybody build their own tanks mount brackets, or are they available some place?
Thanks,
Wes
Kit #95
I did some more mockup stuff and as shown in the pics, the clearances from filters looks OK.
I did Dave's measure of 7 1/8 from the left carb lip to an imaginary firewall and it looks tight, but do-able.
I also checked the carb inlet diameter(~ 1 3/4 in) and there is about 2 in of open area inside these flat filters.
So right now I don't see a problem.
How do you like my Tupperware tank mount?
Did everybody build their own tanks mount brackets, or are they available some place?
Thanks,
Wes
Kit #95
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Kit # 95
Low and Slow - The only way to go!
Low and Slow - The only way to go!
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looking at the overhead view, I do not think it will fit that way. I had to remove the black plastic stator cover and the oil tank then sits just off the bolt under the cover, much closer to the pilot side carb.
If you have a shimmed out mount, or altered the brackets it may work. There was not that much room on my application.
DAve
If you have a shimmed out mount, or altered the brackets it may work. There was not that much room on my application.
DAve
- Wes
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- Joined: Mon Jan 23, 2006 10:32 pm
- Location: Satellite Bch, Florida
Oil Tank vs Air Filter Fit
Dave,
Thanks for the photo, that explains a lot.
I new it was going to be a tight fit to get that oil tank back there where I want it.
I need to go ahead and get some of these pieces bolted up on the front of the airplane and
quit agonizing!
Got to get some painting finished first.
Thanks again,
Wes
Thanks for the photo, that explains a lot.
I new it was going to be a tight fit to get that oil tank back there where I want it.
I need to go ahead and get some of these pieces bolted up on the front of the airplane and
quit agonizing!
Got to get some painting finished first.
Thanks again,
Wes
Kit # 95
Low and Slow - The only way to go!
Low and Slow - The only way to go!
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- Joined: Wed Dec 13, 2006 11:49 pm
- Location: Rapid City, South Dakota
Wes,
Something for those going through the rotax installation process. There are old and new oil tanks out there. So when you go to order nipples for your oil tanks make sure to verify wether you need old style (male) or new style (female) AN fittings. It only eats up a few more days when you make the wrong order. The catalogs may not list/indicate the new part numbers.
Good Luck, Gerald V9
Something for those going through the rotax installation process. There are old and new oil tanks out there. So when you go to order nipples for your oil tanks make sure to verify wether you need old style (male) or new style (female) AN fittings. It only eats up a few more days when you make the wrong order. The catalogs may not list/indicate the new part numbers.
Good Luck, Gerald V9
- Wes
- Premium Member
- Posts: 231
- Joined: Mon Jan 23, 2006 10:32 pm
- Location: Satellite Bch, Florida
Oil Tank fitting
Gerald - many Thanks for the tip,
Do you know the Rotax service letter or instruction that spells that out?
Thanks,
Wes
Do you know the Rotax service letter or instruction that spells that out?
Thanks,
Wes
Kit # 95
Low and Slow - The only way to go!
Low and Slow - The only way to go!
- scubarider2
- Topic Moderator
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mee tooo
I did the same thing. I ordered the firewall forward kit and received the WRONG fittings. Luckily, I got the right fittings with the engine. Used them and all is right with the world.
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Wes,
Sorry, but no idea of any service letter or instruction from Rotax. To throw something else out there, my engine doesn't quite look like yours either. My engine was ordered through the boys at Cornell Aeroworks from LEAF and it arrived with fully firesleeved fuel lines to the fuel pump and then to the carbs. The manifold pressure equalizer was detailed somewhat differently. Oil sump and oil pump fittings were the AN style. And the oil resevoir came with no fittings, which lead me down the road to finding out about the "new" oil can.
Good Luck, Gerald V9
Sorry, but no idea of any service letter or instruction from Rotax. To throw something else out there, my engine doesn't quite look like yours either. My engine was ordered through the boys at Cornell Aeroworks from LEAF and it arrived with fully firesleeved fuel lines to the fuel pump and then to the carbs. The manifold pressure equalizer was detailed somewhat differently. Oil sump and oil pump fittings were the AN style. And the oil resevoir came with no fittings, which lead me down the road to finding out about the "new" oil can.
Good Luck, Gerald V9
- Wes
- Premium Member
- Posts: 231
- Joined: Mon Jan 23, 2006 10:32 pm
- Location: Satellite Bch, Florida
Oil Line Fittings
Well, after finally checking into the oil line fittings, I find I have the wrong type! (see pic)
I did some research into Rotax doc's and found the info in SI-912-003, "Oil Line Conections with UNF Threads".
Apparently back in May of 2000, Rotax bowed to the American market and introduced a 3/4-16 UNF flared fitting as an alternate to the standard metric fitting which has the opposite flare (male vs female).
My oil tank was supplied with metric fittings and the oil drain and pump output fittings are both hose barbs. The firewall foreward kit supplied the UNF flare fittings shown.
So, what I think I will do is order the metric elbow fittings that will mate with the oil tank and swap out the hose barbs on the engine for UNF flare fittings that will mate with the FF package supplied fittings. I prefer the flare connections over the hose barb, just because I know I will be taking these things apart and I have fond memories (and the knuckle scars) of removing old hoses from barbed fittings on the boat!
Hope this helps.
Wes
Kit #95 - still spraying
I did some research into Rotax doc's and found the info in SI-912-003, "Oil Line Conections with UNF Threads".
Apparently back in May of 2000, Rotax bowed to the American market and introduced a 3/4-16 UNF flared fitting as an alternate to the standard metric fitting which has the opposite flare (male vs female).
My oil tank was supplied with metric fittings and the oil drain and pump output fittings are both hose barbs. The firewall foreward kit supplied the UNF flare fittings shown.
So, what I think I will do is order the metric elbow fittings that will mate with the oil tank and swap out the hose barbs on the engine for UNF flare fittings that will mate with the FF package supplied fittings. I prefer the flare connections over the hose barb, just because I know I will be taking these things apart and I have fond memories (and the knuckle scars) of removing old hoses from barbed fittings on the boat!
Hope this helps.
Wes
Kit #95 - still spraying
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Kit # 95
Low and Slow - The only way to go!
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Re: Rotax Air Filter
An air filter is a device which removes solid particulates such as dust, pollen, mold, and bacteria from the air. That Rotax Air Filter is great. It helps a lot.Wes wrote:ALL,
Just looking for experience on Air Filters for the Rotax.
Since it looks like I won't be using the Rotax intake box, cause it won't fit!
The filters I see on most installations are the cone shaped K&N (don't know the P/N) and the clearance between the fire wall is pretty tight, at least on the left side.
When I ordered the firewall foreward package form Just, they sent the K&N filters (P/N SP-2706) shown in the photo that are a whole lot shorter than the cone shaped ones. It would seem these flatter filters would be better (more firewall clearance). They called and said they sent me the wrong filters, but right now I don't see the problem with them.
Anybody have any objections?
Wes
Kit #95
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