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Thread: Grinding intake and exhaust valve tips?

  1. #1
    Toymods member no 341 Domestic Engineer amichie's Avatar
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    Default Grinding intake and exhaust valve tips?

    If your valves are too long is there any reason why you cant have about 1mm ground off the tips. Obviously I will check that the bucket is still pushing on the tip and not the retainer etc. I guess the question is there any special treatment on the surface that gets ground off if you go too far?

  2. #2
    anti blasphemy ! Carport Converter
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    Default Re: Grinding intake and exhaust valve tips?

    no problem at all, ive only used a valve griding machine to grind valves.
    as you said, just make shaw the shim is in contact with the valve stem.

    dont go to far , just keep measuring.
    i dont have a funny or cool signature.

  3. #3
    she loves me coz im a Conversion King love ke70's Avatar
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    Default Re: Grinding intake and exhaust valve tips?

    thats how most shops set valve clearances when they reseat the valves...
    MY RIDE, 2 Door LHD KE70 sedan with 1G HKS stroker: http://www.toymods.org.au/forums/showthread.php?t=51760

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  4. #4
    Toymods member no 341 Domestic Engineer amichie's Avatar
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    Default Re: Grinding intake and exhaust valve tips?

    Quote Originally Posted by love ke70
    thats how most shops set valve clearances when they reseat the valves...
    Yeah. I know.

    I was just asking if its possible to take too much off.

    The motivation for my question is I want to try and fit 2jz valves into my 7Mge head.

    2JZ valves are about 0.5mm longer and I would prefer to just grind the tips back rather than buy 24 new shims.

    Anyway thanks for the input.

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    AVGAS DRINKING Carport Converter 30psi 4agte's Avatar
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    Default Re: Grinding intake and exhaust valve tips?

    If you go too far you will take the hardness of the tip.
    So yes it is possible to go too far.
    .5mm should be ok. 1mm mabe too far.

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    Cressidaspert Carport Converter andrew_mx83's Avatar
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    Default Re: Grinding intake and exhaust valve tips?

    foget the valves

    grind the cams

    more lift

    win.


  7. #7
    Toymods member no 341 Domestic Engineer amichie's Avatar
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    Default Re: Grinding intake and exhaust valve tips?

    Quote Originally Posted by andrew_mx83
    foget the valves

    grind the cams

    more lift

    win.

    Hi Andrew

    I am planning on using my BC 264 cams that have a 8.5mm lift already.

  8. #8
    Cressidaspert Carport Converter andrew_mx83's Avatar
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    Default Re: Grinding intake and exhaust valve tips?

    more lift

    win.


  9. #9
    Forum Member 1st year Apprentice
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    Default Re: Grinding intake and exhaust valve tips?

    Grave dig. Anyone have experience with this?
    I'm looking to more the of 1-1.2mm range.

    Valves with heat treated tips seem like a no-no.
    $$ valves with pressed in 'hardened tips' should be fine assuming care in machining?

  10. #10
    Junior Member Domestic Engineer
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    Default Re: Grinding intake and exhaust valve tips?

    I believed your quality valves did have a heat treatment on the tip to extend life.

    are you sure you machinist didn't cut the seats to far into the head? that has happened to some 3sgte guys, they then couldn't find thin enough shims and yeah. machinist error.

    http://www.ferrea.com/tech_tips.php?tech_tips_key=19
    "They feature a one-piece forging made from stainless steel, a special heat treatment process, hard chrome stems, and hard tip."
    Last edited by aus jd 2703; 29-10-2015 at 01:17 PM.
    1990 ST185 Running stock Gen 3 power, 216awhp at 15psi. 13.6 second down the quarter

  11. #11
    Olde mechanic Carport Converter oldeskewltoy's Avatar
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    Default Re: Grinding intake and exhaust valve tips?

    1mm... really, that much? Seems like quite a bit. as aus jd 2703 points out, maybe your machinist cut too much from the seats???
    Information is POWER... learn the facts!!

  12. #12
    Forum Member 1st year Apprentice
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    Default Re: Grinding intake and exhaust valve tips?

    Hey guys, I contacted Ferrea and they say that at most 0.5mm from their heat-treated tip'd valves can be removed without issues.
    I would assume this would be different for vavles with pressed-in hard tips; where the engine design has direct interference on the valve tip...

    My reasons are the same as amichie, I want to use 'off the shelf' valves from one engine in another different engine (that has no aftermarket support).
    Sadly even machining off 0.5mm I think I will be unable to re-shim my valves properly once valve seats are re-cut.

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