09-13-2006, 07:08 AM #1
Rear air intake and hot air venting
This topic has been the focus of quite a few discussions. I thought I would post some pictures of what I did for my 4" dia rear air intake on my '04 RXP. The 4" dia to 3" dia 45 degree silicone reduction elbow I purchased from Stealthwork (www.stealthwork.com) for $40 + $11 shipping. I liked this elbow for the fact of the smooth transition into the SC air inlet. Overall I am quite pleased with how the rear air intake came out.
09-13-2006, 07:10 AM #2
Nice. I too would rather a smooth transition. I like how you put the screen over the openning. This way if water does get there it`ll be much smaller droplets and probably just burn through motor. Where are your flowrites? I`m orderring my 2" ones today.
Last edited by HOSS; 09-13-2006 at 07:16 AM.
09-13-2006, 07:22 AM #3
These pictures show what I did to address hot air venting out of the engine compartment. I purchased four 2 1/2" dia Flow Rite vents from Blair Powersports (www.blairps.com) for $15.26 ea. I went with the 2 1/2" dia type because they have the rubber grommet which will form fit to the contour of the plastic seat support.
For the air inlet hoses in the front chrome scoops, I used rubber grommets (PN 293720036) which I think are off a Sea Doo XPL. Originally I had these hoses setup to bring air down to my 3" dia front air intake. It seems to work well as when comparing this setup to the setup of having the 3" dia hose back to the rear air vent, I saw no difference in my boost pressure.
Last edited by MikeTrin; 09-18-2006 at 03:50 PM.
09-13-2006, 07:22 AM #4
- Join Date
- Oct 2005
Question: What is it about the rear intake that makes it better than say the RIVA hood direct connected to a RIVA pf or 4 inch intake? Is it because the air has less difference to travel to the SC? I haven't really looked at that area, but it just doesn't seem like it would get much airflow with the seat covering that opening.
I just want to know what the advantages are of this over another intake because Im considering it.
09-13-2006, 07:26 AM #5
- Join Date
- Oct 2005
Another thing: If you go to the rear intake do you have to cut those holes in the engine cowling? I really don't want to do that for my style of riding.
Aren't you just taking a 4" intake and connecting it to where that rear snorkel exits below the back of the seat? Can you just do that?
09-13-2006, 07:29 AM #6
As I see it, advantages to the rear air intake are distance to the SC, size of the opening, water ingestion for me is less of a concern, and I saw a 1 lb increase in boost pressure and a 50-100 rpm gain (I am running the Riva/Vortech SC impeller - old version). I did not see a gain in top end, but the low end and midrange pull seems to be much improved.
09-13-2006, 07:38 AM #7
I put the screen over the opening for the reason that Hoss stated about water droplets being broken up plus to keep large pieces of junk or tools/small parts when wrenching from falling into the air inlet.
The vents in the seat support are the Flow Rites manufactured by SLP. These vents are made for the snowmobile powder riders who ride out west in the mountains. The material used in them is the same material used on the Outerwears air filter covers. I spoke to the sales manager at Outerwears (which is located in MI if of any interest) and he informed me that they actually sell the material to SLP that they use in the Flow Rites.
09-13-2006, 08:59 AM #8
09-13-2006, 09:06 AM #9
So you gain 1lb of boost? Does this put you at around 8.5?
09-13-2006, 09:11 AM #10
I also gained 1 psi of boost with my rear air intakes.
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