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  1. #11
    Registered JIMKID Motorsports's Avatar
    My Boats:
    2009 30 LS7 SKATER 711
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    Mar 2001
    Livonia Mi Usa
    use inconell pay me now or pay me latter just do it or stay on the dock sorry

  2. #12
    Registered PatriYacht's Avatar
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    94 43SC Black Thunder
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    Jul 2002
    Mercury Racing has used Inconel in all engines from the Cyclone 454 400hp up.

  3. #13
    Registered Roger 1's Avatar
    My Boats:
    1993 Cigarette Top Gun
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    Dec 2002
    Kankakee Illinois
    Quote Originally Posted by gottahaveone View Post
    the next time your at an airport and your walking to your jet, note the rotating turbine blades on the engines. these are called "hot rotating parts". if you look at a turbine engine you will quickly understand why it is called "suck and blow"!

    air is brought in, fuel is pushed in, it is compressed, and ignition takes place, and thrust is then accomplished, thereby making airplane/boat fly. basics here, ie. turbine 101.

    when you look into engine, you see the frontal blades, those and all the other "hot rotating" parts are made of ICONEL 718. usually with a fairly high if not obscene high ROCKWELL HARDNESS!

    the base material of iconel is NICKEL!

    the next meteorite you happen to see or find, its base material is NICKEL!

    nickel is HEAT RESISTANT thereby thats why you find meteorites on occasion, because they have survived the insane heat of rentry thru earths atmosphere.

    iconel is very heat resistant, but it is a TOTAL ***** KITTY TO MACHINE as you get into the higher ROCKWELL HARDNESS SCALE.

    if you are turning/milling/drilling/threading iconel, you are in for some very high cost tooling because standard tooling (inserts/drills/mills) coated or uncoated will NOT handle repeated tool paths without changing tooling very frequently. in other words you may already have 25 ops on part completed, and if machinist doesnt keep his eyeballs peeled for tool wear it is very easy to scrap part(called a "crash") when insert goes south due to increased wear due to material and its rockwell hardness.

    there is a material, to machine iconel available from sandvick(fairlawn,new jersey) called "WHISKERS". this is a man made substance and time doesnt allow me to go into its structure or mfg. process. just suffice it to say its expensive as HELL. but if your doing iconel all day and want to be competitive making parts, bets are on you WILL BE USING it or you will be sucking hind tit, as far as quoting parts, in the jet turbine arena, which is very cutthroat as far as cost per part made, and time spent on part.

    so ya think ya still want stainless valves? apple/apple comparison look up heat resistance of stainless vs. iconel valve. your answer will be obvious. also stainless is about as difficult to machine as butter in comparison to iconel. ie. higher tooling costs for iconel, thereby end user will pay more for iconel valve vs. stainless valve.

    as another interesting note.........ICBM missile nosecones are made from ICONEL 718, due to heat factor of rentry into earths atmosphere. ask me how i know all this ?

    hope that helps.

    Great answer!

  4. #14
    My Boats:
    2006 32 Skater Qtr canopy
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    Aug 2005
    Point Pleasant/Demarest NJ
    Inconel Inconel. Was at manley yesterday. No substitutes.

  5. #15
    Registered aTX427's Avatar
    My Boats:
    Fountain 42 Lightning - 700sci / #6 dry sump
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    Jul 2001
    Austin, TX
    Inconel without a doubt

  6. #16
    Platinum Member Platinum Member O.C.Barry's Avatar
    My Boats:
    28 Cigarette SS Race Edition
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    Dec 2001
    Ocean City, MD


    Quote Originally Posted by PatriYacht View Post
    Mercury Racing has used Inconel in all engines from the Cyclone 454 400hp up.
    Agreed, I have an '87 454/420 apart and it has INCONEL exhaust valves, so it is not just the big power / big cube engines.
    Thanks, Barry

    Driver - High's Fuel Your Journey Cigarette Racing Team #598

  7. #17
    Registered markodessa's Avatar
    My Boats:
    1996 Baja 252
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    Nov 2009
    I think what your saying is use inconel rather than stainless. thanks for the input guys, I ordered the valves this morning.

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