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K&N vs. Flipping the breather cap

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by ftn96, Mar 17, 2001.

  1. ftn96

    ftn96 1/2 ton status

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    I run my breather cap upside down every so often for street use and love the sound and performance I get. Does the K&N breather kit bring performance anywhere close to this?

    Will work for beer, parts and tools.
    90 Jimmy 350TBI-700R4-241-33" BFGs-10 bolts w/4.10's
    <A target="_blank" HREF=http://www.nashvillek5.freeservers.com>http://www.nashvillek5.freeservers.com</A>
     
  2. ftn96

    ftn96 1/2 ton status

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    Nobody????

    Will work for beer, parts and tools.
    90 Jimmy 350TBI-700R4-241-33" BFGs-10 bolts w/4.10's
    <A target="_blank" HREF=http://www.nashvillek5.freeservers.com>http://www.nashvillek5.freeservers.com</A>
     
  3. moneypit

    moneypit 1/2 ton status

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    I did a Ram Air Box with a K&N filter on mine and I love it. You really notice it on the top end performance.
     
  4. 90K5

    90K5 1/2 ton status

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    I flipped mine for a few days, but I got prettytired of it, don't think it helped much with power, but its hard to tell when its louder. I flipped the one on my friends '95 Tahoe and he thinks its awesome and he has a lot more power...

    90K5

    See my truck at <A target="_blank" HREF=http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502>http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502</A>
     
  5. beefcake83

    beefcake83 1/2 ton status

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    Excuse my ignorance, but how are you guys flipping the breather cap. You are referring to the valve cover cap aren't you? - Gary

    Gary Graham
    '83 GMC Jimmy 350 'Beefcake'
    Eielson AFB, Alaska
    Metallica & Mountain Dew
    http://community.webshots.com/user/beefcake83
     
  6. beefcake83

    beefcake83 1/2 ton status

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    Gave it another thought... You must be talking about the air cleaner lid. 'Breather cap' threw me for a sec.

    Gary Graham
    '83 GMC Jimmy 350 'Beefcake'
    Eielson AFB, Alaska
    Metallica & Mountain Dew
    http://community.webshots.com/user/beefcake83
     
  7. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Flippin the breather lid was something we used to do when we were kids. It sounded cool but I highly doubt you're getting better performance out of it.
    With the lid flipped you're sucking in all the hot underhood air which in theory should reduce performance....it is louder though [​IMG]
    I imagine with accurate testing equipment the K&N would outperform the flipped breather every time.

    Rene

    [​IMG]<A target="_blank" HREF=http://jules.coloradok5.com>http://jules.coloradok5.com</A>
     
  8. jarheadk5

    jarheadk5 1/2 ton status

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    I flipped my air filter lid over the summer. I'll swear that I felt a power gain, especially when accelerating up to highway speed. The engine definitely revved up faster (you know, punching the gas while in neutral or park...) and the sound was cool. I don't track mileage often (so when the wife asks, I can say "I don't know" and NOT be lying!!) so I can't comment on that.

    Using the stock, restrictive air filter housing, I personally don't think you'll see any noticeable changes. Now if you go to a dual-snorkel setup or an open-element, you should definitely notice a difference with a K&N.

    [​IMG] Semper Maintenance!
     
  9. ftn96

    ftn96 1/2 ton status

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    Yeah Rusty, I know it sux more hot air from with in the engine bay, but while driving in the city the air ramming in from the front should be enough. At least I hope. But man it sure does seem to breath alot better. But I have decided to install the K&N air induction kit. But for now I will leave the breather cap upside down for now and correct when off road. But that will be a while. I'm re-gearing the front diff this week.

    Will work for beer, parts and tools.
    90 Jimmy 350TBI-700R4-241-33" BFGs-10 bolts w/4.10's
    <A target="_blank" HREF=http://www.nashvillek5.freeservers.com>http://www.nashvillek5.freeservers.com</A>
     
  10. beefcake83

    beefcake83 1/2 ton status

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    Your reply brought up an interesting question for me.... If I have the stock set-up with all of the vacuum lines going to the air cleaner, what do I do with the lines if I go to a aftermarket chrome open element set-up? Thanks, Gary

    Gary Graham
    '83 GMC Jimmy 350 'Beefcake'
    Eielson AFB, Alaska
    Metallica & Mountain Dew
    http://community.webshots.com/user/beefcake83
     
  11. Hathaway

    Hathaway 1/2 ton status

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    Any one heard of the placebo effect? You guys want to see a big difference, so you do. Even though there more than likely isn't one. I have a friend with a 280ZX who put a K&N in and he said he could "FEEL THE POWER", my arse. I put a K&N in my blazer, I could see the difference in gas mileage (went up 2mpg) but you don't FEEL anything. I do recomend K&N's for the gas mileage boost, also nice not having to replace an air filter every time you change the oil.
     
  12. muddin4fun

    muddin4fun 3/4 ton status

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    I've got a 14" round 4" tall open K&N and it sounds great and performs really well!

    [​IMG]


    <A target="_blank" HREF=http://muddin4fun.coloradok5.com>http://muddin4fun.coloradok5.com</A>
     
  13. BlazerGuy

    BlazerGuy 3/4 ton status

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    I tried flipping the air cleaner but I couldn't close the damn hood [​IMG] But my new neighbor had a open element K&N laying around and I noticed a slight increase in power from it.

    Murphy's Laws on Life :
    "Opportunity always knocks at the least opportune time." [​IMG]
     
  14. Blazer_Boy

    Blazer_Boy 1/2 ton status

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    I was wondering about the vac lines too. I wanna get one of those Edelbrock Elite Series open housing to use with my K&N. They say they have some kinda provision for a breather. I think you could rig something up using one of those. I'm not sure about the performance difference though, I just think it would cool as hell to look at, lol.
     
  15. jarheadk5

    jarheadk5 1/2 ton status

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    Hey BigBrown K5, when you can definitely FEEL the harder push at your back, and you can FEEL the firmer shift because the truck's not so slug-like anymore, and the time it takes you to accelerate from 30 to 60 on the same stretch of road DECREASES by 2 seconds, THAT is a difference.

    [​IMG] Semper Maintenance!
     
  16. dyeager535

    dyeager535 1 ton status Premium Member

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    Without taking it to the track, flipping the lid cannot be claimed to increase power. With somewhere near a 75 degree drop in air temperature, the engine makes 30%(!!) more power. Sucking in warm underhood air is not advantageous. (somewhere around 175 typically) At what point are large volumes of hot air more beneficial than a small volume of cold air? Again, thats a track test.

    A large volume of outside air or a less restrictive filter element will make a difference. Obviously a combination of both is better.

    Of course you can hear the difference...the air cleaner is designed to deaden the sound. Without any sound insulation in my K5, and stock single snorkel, I can hear my secondaries open up too...doesn't mean its faster just 'cause I can hear them.


    Air can't easily escape from under the hood, or it wouldn't take some 40+ hp just to move the truck against wind resistance...they have a large frontal area, with an engine bay (like almost all vehicles) that is blocking air from exiting...it can't go back or down, firewall and motor, can't go out the side or the top, fenders and hood in the way. At higher MPH, this effect is even more pronounced. Gotta face it, the undehood temp is not going to change as much as getting outside air straight to the carb without being heated.


    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
     
  17. ftn96

    ftn96 1/2 ton status

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    Trust me dye bro. I understand. Maybe Im leatting the sound intterfear with my feel. But it sure does seem like it is more responsive, not really so much as more power. But just has a crisper feel to it. But this may be all the years of dope and beer from "High" school. LOL!!! But anyway. I thought I felt some difference, and was wondering if the KN stuff would give me close to what I think Im getting now. Or I could just put me a hood scoop in. LOL!!!!!

    Will work for beer, parts and tools.
    90 Jimmy 350TBI-700R4-241-33" BFGs-10 bolts w/4.10's
    <A target="_blank" HREF=http://www.nashvillek5.freeservers.com>http://www.nashvillek5.freeservers.com</A>
     
  18. Blaze

    Blaze 1/2 ton status

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    I've got a K&N airfilter and the lid flipped on my truck. You can definitely feel the difference. With the stock filter and the lid normal I can barely outrun my 96 Pathfinder. With the K&N and the lid flipped I can smoke the Pathy. My fiancee might just be getting better at driving the Pathy, but I like to think it's my truck. Haha.

    [​IMG]<A target="_blank" HREF=http://www4.ncsu.edu/~brschoch>http://www4.ncsu.edu/~brschoch</A>
    My truck beat up your SUV
     
  19. jarheadk5

    jarheadk5 1/2 ton status

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    Like I said, when you flip the filter lid and your 30-60 time decreases by 2 seconds, that's an improvement. Not a perceived improvement, a VERIFIED improvement.

    [​IMG] Semper Maintenance!
     
  20. CrazeeBush

    CrazeeBush 1/2 ton status

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    You wanna test out a K&N with an open element breather, I can come by and let ya swap out breather for a bit and take a wee little test drive. Open Element Breather + K&N=2mpg. Best buy I've ever made IMO.

    -JoSH
    crazeebush@aol.com
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