Oversized valves?

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  1. #1
    CelicaSupra.com Member SupraFreak13's Avatar
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    Oversized valves?

    my dad and i have been thinking about doing up one of my 5m heads. it seems the ports are really good, but maybe too big for the valves. can you go with bigger valves? the stock ones are already a decent size so idk.
    84 P-type, original red paint, rust free, mint, and back on the road... for now.

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  3. #2
    CelicaSupra.com Member
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    I've overheard from the local guru's that the valves in the 5M head are already "oversized".
    Dennis
    -01 Subaru Impreza 2.5RS+T
    -95 Nissan Pathfinder SE-V6

  4. #3
    CelicaSupra.com Member Donn29's Avatar
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    I think Chimp has 1mm on his site.
    Current fun car: Black 86 with 7M-GTE/W58/3.58/TrueTrack, 300whp, 13.5@102.
    Wifeys Car: Burgundy 84 Auto and stock. Previous Daily: Two Tone Brown 84 Cressida: Sold and helped it get a 7M/W58 Swap
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  6. #4
    CelicaSupra.com Member moonpie33's Avatar
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    yes i had 1mm on mine and wow but i sugest getting a cam if you do this

    you will also need to port polish head 210 injectors piggyback and 3 inch intake with a modified afm and a enlarged intake if you want to get all that power
    the power difference is amazing

    you will be amazed by the power lol
    1985 supra 66,000 miles 7mge, to many mods to list
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  7. #5
    CelicaSupra.com Member ma67 lover's Avatar
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    what do you mean by piggy back?
    ~William Macy~
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  8. #6
    CelicaSupra.com Member 84ptype's Avatar
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    piggy back is a air/ fuel type controller.

    normally they will allow you to add and remove fuel at certain RPMS based on the sensors you tie into etc. You can search for a better description.
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  9. #7
    CelicaSupra.com Member moonpie33's Avatar
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    Something like a safc!!!
    thanks scott
    yes and adjustable cam gears you will have a amazing jump in hp then tune.
    Guys im thinking with this type of setup you would achieve 15 to 25 rwhp what do yall think? And lets say with advanced timing.
    1985 supra 66,000 miles 7mge, to many mods to list
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  10. #8
    CelicaSupra.com Member Donn29's Avatar
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    Quote Originally Posted by moonpie33 View Post
    yes i had 1mm on mine and wow but i sugest getting a cam if you do this

    you will also need to port polish head 210 injectors piggyback and 3 inch intake with a modified afm and a enlarged intake if you want to get all that power
    the power difference is amazing

    you will be amazed by the power lol
    Personally I don't agree with the other requirements. I probably wouldn't even invest in oversized valves unless I damaged some. Just adding oversized valves will not mean you need to buy all that other stuff too. I'm sure that most of them would build more power together, but by the sounds of it, he is only guessing. Why add a SAFC or bigger injectors? I'd be surprised if you maxed out the AFM and it wasn't able to keep a good A/F. Sure tweaking is nice, but just adding a set of cams, OS valves, and a better intake/exhaust likely won't require Fuel system modifications. Plus how would you tell if you are doing good with the SAFC with a wideband or dyno tuning?
    Current fun car: Black 86 with 7M-GTE/W58/3.58/TrueTrack, 300whp, 13.5@102.
    Wifeys Car: Burgundy 84 Auto and stock. Previous Daily: Two Tone Brown 84 Cressida: Sold and helped it get a 7M/W58 Swap
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  11. #9
    CelicaSupra.com Member moonpie33's Avatar
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    Im just taking it to the extreme. lol This setup would be a cool setup! The reason i said a safc which wouldnt be needed is to push more fuel to air for the valves and the cam unless i am wrong then please chime in. thanks
    1985 supra 66,000 miles 7mge, to many mods to list
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  12. #10
    CelicaSupra.com Member Donn29's Avatar
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    If you do something to the engine to make it suck more air in, the AFM will read it and add more, as far as I know. If you are really power hungry get a wideband and see what your motor is doing before blindly dumping in more fuel.
    Current fun car: Black 86 with 7M-GTE/W58/3.58/TrueTrack, 300whp, 13.5@102.
    Wifeys Car: Burgundy 84 Auto and stock. Previous Daily: Two Tone Brown 84 Cressida: Sold and helped it get a 7M/W58 Swap
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