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Thread: 2-TG N/A Cam Options - Real world results wanted

  1. #46
    Toymods Vice President Chief Engine Builder TheToyman75's Avatar
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    Default Re: 2-TG N/A Cam Options - Real world results wanted

    The 262 is unopened and running a set of the Factory 40mm carbs and the Fidanza flywheel. It makes 70rwkw.
    1971 2T-B Celica TA22 ST.
    1973 2T-G Celica TA22, aka "The Unicorn".
    1975 2T-G Celica TA27 GT
    1976 2T-G Celica TA23, aka "The Colonel".
    1985 3F Auto FJ62 Landcruiser
    1989 7M-GTE MA70 Supra, aka "The Poopra"

    History: Rods Classic Celica Sampler thread.

  2. #47
    livin on the edge as a Grease Monkey Snyper's Avatar
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    Default Re: 2-TG N/A Cam Options - Real world results wanted

    Ok that's a good result, be good to compare mine when it's done eventually.
    Daily - Prado 90series
    Work - T908 620hp Cummins ISX
    Shed - 1975 TA22 2TG

  3. #48
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    Default Re: 2-TG N/A Cam Options - Real world results wanted

    This rod ratio thing in this thread is confusing me.

    The potential power of an engine lies within a certain boundary which is mainly defined by capacity and volumetric effiecency. I am really struggling to see that a rod ratio change will give power gains in the same region as upgrading the camshafts.

    Taking a 2t with rod ratio of 1.75 (which according to most is close to optimal) and 3t with rod ratio of 1.58. We take the bore out on the 2t to 89mm(max) to get a capacity of 1742cc. The standard 3t capacity 1s 1770cc.
    Lets assume all other variables influencing the volumetric efficiency(cr, cams etc) is the same as well as rotating mass.
    Will the 2t due to its better rod ratio be a better engine??Will it make more power?....Or am I totally clueless?

  4. #49
    Junior Member Backyard Mechanic
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    Default Re: 2-TG N/A Cam Options - Real world results wanted

    Quote Originally Posted by Tiggeriffic View Post
    This rod ratio thing in this thread is confusing me.

    The potential power of an engine lies within a certain boundary which is mainly defined by capacity and volumetric effiecency. I am really struggling to see that a rod ratio change will give power gains in the same region as upgrading the camshafts.

    Taking a 2t with rod ratio of 1.75 (which according to most is close to optimal) and 3t with rod ratio of 1.58. We take the bore out on the 2t to 89mm(max) to get a capacity of 1742cc. The standard 3t capacity 1s 1770cc.
    Lets assume all other variables influencing the volumetric efficiency(cr, cams etc) is the same as well as rotating mass.
    Will the 2t due to its better rod ratio be a better engine??Will it make more power?....Or am I totally clueless?
    It can be confusing to people who have never dealt with rod length/ stroke ratios. Basically the angle between the rod and bore is less with a longer rod which means piston is achieving more of a straight up and down motion rather than being pushed sideways, which a more acute angle creates. The basis is less sideways push less friction and less loss of energy at the mid stroke point, means a freer revving engine and very minor increase in torque. Hope this helps.

  5. #50
    Bull now in china shop! Domestic Engineer NME308's Avatar
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    Default Re: 2-TG N/A Cam Options - Real world results wanted

    Quote Originally Posted by ToyTA22 View Post
    It can be confusing to people who have never dealt with rod length/ stroke ratios. Basically the angle between the rod and bore is less with a longer rod which means piston is achieving more of a straight up and down motion rather than being pushed sideways, which a more acute angle creates. The basis is less sideways push less friction and less loss of energy at the mid stroke point, means a freer revving engine and very minor increase in torque. Hope this helps.
    Nope it doesn't help...
    The longer rod has less torque but can rev higher.
    The shorter rod has more torque and does not rev as high.

    There is such a small bees d!<# between option A and option B that on every forum you care to read there is great argument as to which has greater merit.
    As a side note the engine masters challenge has been won for the last few years by short rod engines. This does not prove ultimate superiority either...

    Cheers,
    Jason
    3TC Compound Turbo 1976 TA23 - Members Ride Thread HERE
    479RWHP on 50psi and 70psi hasn't broken her at the track!

  6. #51
    Forum Member 1st year Apprentice
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    Default Re: 2-TG N/A Cam Options - Real world results wanted

    Quote Originally Posted by ToyTA22 View Post
    It can be confusing to people who have never dealt with rod length/ stroke ratios. Basically the angle between the rod and bore is less with a longer rod which means piston is achieving more of a straight up and down motion rather than being pushed sideways, which a more acute angle creates. The basis is less sideways push less friction and less loss of energy at the mid stroke point, means a freer revving engine and very minor increase in torque. Hope this helps.
    toyota 2tg long rod /short piston, 14mm longer than standard










  7. #52
    Toymods Events Secretary Too Much Toyota trdee's Avatar
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    Default Re: 2-TG N/A Cam Options - Real world results wanted

    those must have cost a pretty penny!
    1988 AW11 9A-GTE - Turbo Missile | 2004 Elise K20A - N/A Screamer | 1984 MA61 1JZ-GTE - 80s cruiser
    Quote Originally Posted by Rex_Kelway View Post
    .....and the within first laps everything that made the AW11 great hit Rex as if the 'Gods of driving fun' had all Jizzed on his face.....
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    Mono blocs mate....as close to yours as a Ferrari is to a Fiesta

  8. #53
    Junior Member Automotive Encyclopaedia stidnam's Avatar
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    Default Re: 2-TG N/A Cam Options - Real world results wanted

    nice, is this for the 3tg you were building with the 84mm crank? what are the specs on the pistons? Rods are same as 2tg just 14mm longer?

  9. #54
    Forum Member 1st year Apprentice
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    Default Re: 2-TG N/A Cam Options - Real world results wanted

    Quote Originally Posted by stidnam View Post
    nice, is this for the 3tg you were building with the 84mm crank? what are the specs on the pistons? Rods are same as 2tg just 14mm longer?
    designed pistons to my own specs



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