Thread: VaRedneck's new rear air intake
10-07-2007, 06:16 PM #1
VaRedneck's new rear air intake
Finished assembly...still needs the spit and polish...wasn't gonna worry about all that till I was sure it was gonna work...I think it does.
Earlier this year I was working on a rear air system for my '05 RXT. I wanted to keep the rear seat, so I did a little re-working on the seat's frame to allow air inside with the seat still in place. Originally I had planned on using the spark plug holder area as a 4" inlet going through some 4" drain tile(Lowes Air). That meant having a terrible upside down ? shape into the SC. Added together with a restrictive opening where the spark plug holder was and the results....77-7800+ rpms....max.
Back to the drawing board.
I still liked being able to use the rear seat...maybe having more air into the seat was the answer? I had also wanted to be able to keep my anchor under the seat as well...Fck-it I'll put the anchor in the front and figure out how to get a bigger air duct in through the bin to the SC.
I had seen others do something like this with a filter type set-up with holes in the seat or...no seat...or...under the seat...breathing heated air surrounding the engine.
Another problem...flo-rite material....I need to use this(maybe)...I had to use something...couldn't breath outside air without some sort of filter...too dangerous...one bug....BLAM...so...why not something water resistant. Instead of a filter and pre-filter...just a pre-filter.
Next....The riva rear air kit for the RXP has a pre-filter area of approximately 13"sq. Which comes out to being about the area of a 4" circle. I wanted to do better. A 5" circle has the area of apprx 19.5"sq...which means the SC should be able to breath easier through this size flo-rite than one measuring about 30% smaller. No? So...I clamped some flo-rite material around the end of a 2' length of 5" aluminum tube connected to a 5"x4" 90* bend(altered slightly) I inserted a 1.5" length of 4" tubing into one end of the 90* so I then could connect a 4"x3" silicone 45*(altered slightly)onto the SC.
This morning conditions were as follows.
calm w/ occasional bass-hole wake.
straight to 8100and one freak spike at 8350...that's right...8350! I dunno if that's good or not though.
later in the day
one bar of fuel
straight to 8100 an a spike at 8300.
This intake doesn't seem to have a problem breathing. Someday I'll use some Fiberglass window screen material instead of the flo-rite stuff and see how she does.
Anybody think I'm ready to step up to either the intercooler, sc, or prop?
Last edited by VaRedneck; 10-07-2007 at 06:57 PM.
10-07-2007, 06:21 PM #2
10-07-2007, 06:22 PM #3
10-07-2007, 06:23 PM #4
10-07-2007, 06:24 PM #5
10-07-2007, 07:16 PM #6
What do you figure re my r's with this intake and my other question re a rev limiter?
By the way...the sound is...different...like having a window seat on a 737. You can easily hear the SC.
Last edited by VaRedneck; 10-07-2007 at 07:21 PM.
10-07-2007, 07:19 PM #7
if you have adjustable nozzle/rings i would say mess with those to get a better idea of where your ski stands. if the spike is very brief then i wouldn't worry about it. i think you'd need a new prop to get rid of any hiccups though, you just added some decent power.
10-07-2007, 07:46 PM #8
...looks like I got to work on my...(how did Will Ferrel say it)...."strategery"....gotta get some fundage past the mrs.
10-13-2007, 06:58 PM #9
Tried something a little different tonight before it got too dark.
I changed out my "pre-filter". Instead of the flo-rite material I used a 5" dia SS strainer...yep a veggie strainer. It was made from SS screen, already dome shaped...I cut it free from it's frame and clamped it around my 5" intake...lookes a lot better than just the flo-rite. It'll keep my june bug out I'm sure...and it breathes easier...I think.
Straight to 8100...then steady at 8150...on glass. With a little chop it read a consistant 8100. I couldn't get her past 8150 except for the rare flicker at 8350.
Is it the easier breathing bug screen I used or the lower air temp....or both, that's getting me to 8150?
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