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Conference vicki::boats

Title:Powerboats
Notice:Introductions 2 /Classifieds 3 / '97 Ski Season 1267
Moderator:KWLITY::SUTER
Created:Thu May 12 1988
Last Modified:Wed Jun 04 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:1275
Total number of notes:18109

775.0. "K + N airfilter/flame arrestor?" by SALEM::NORCROSS_W () Mon Dec 10 1990 07:55

    Has anyone installed a K + N airfilter/flame arrestor on their motor?
    Are they Coast Guard approved?  Any performance benefits?  I saw them
    for sale once in a boat mag (available from Popeyes?).  I haven't seen
    another ad.  The K + N auto filter is supposedly good for 20 HP over
    a stock air filter on alot of car engines.
    Thanks, Wayne 
T.RTitleUserPersonal
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775.1I tried one on my BAJA - didn't fit..STAR::BOIKOHeaven..No,it's Iowa/Field Of DreamsWed Dec 12 1990 16:379
    Yes Wayne, I bought a K&N airfilter/flame arrestor for my Baja
    Sunsport for about $110. The only problem was that when I tried to
    close the engine hatch/sun deck it didn't fit. I tried to get a lower
    profile K&N, but they didn't have a model (at that time) which would
    fit.
    
    Yes, K&N airfilter/flame arrestors are Coast Guard approved.
    
    								-mike-
775.2Worth the effort and $$$..Don't knowPNO::WOYAKWed Dec 12 1990 17:506
    I installed a couple of K & N's on my rig quite a while back . (twin
    502's) I have had no problems. It sounds like the units are breathing
    easier and I have noticed a slight increase in response. I could not
    tell if it helped in GPH etc..The results could be significantly better
    in a smaller rig. 
    
775.3Works on a motorcycle !!POCUS::CULLENMon Dec 17 1990 16:198
    I installed one on my motorcycle, yielded approximately a 15% increase
    in HP.
    
    I have not installed them (twins) in the boat because I'm concerned about
    clearance between the flame arrestors and the engine hatch cover.  I'd
    like to know how you make out.    
    
    Tom 
775.4prop/bearings...HYEND::J_BORZUMATOTue Dec 18 1990 09:4428
    Carl, I'm not an expert here.
    
    But looking at your numbers: Low side 525  High side 690.
    
    My marina gets $44 an hour.
    
    First off you can't always tell by looking at the props if they
    are balanced. --its like looking at a zinc thats been in the water
    for awhile. while it may look OK, it will not weigh the same.
    The same goes for props.
    
    Besides all of this, they should be checked for balance at the least.
    I had mine pulled and sent up to H&H in Boston.
    
    As for pulling them and reinstalling them:
    
    I'd guess 1-1.5 hrs. @ $44. and hour:  $44-66
    
    Prop work is too dependent on what they need.
    
    As for the cutlass work, see what the parts cost you, deduct it from
    their estimate, divide the balance by their labor rate and see
    what "hours" they are charging you. If you think its high
    "HAGGLE LIKE HELL"
    
    If you don't want them to do it will YOU???
    
    JIm.