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Thread: info on using a mazda rx8 gearbox on cozzy engine

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    info on using a mazda rx8 gearbox on cozzy engine

    could anyone give me any info on fitting a mazda rx8 6 speed gear box on to a cozzy engine ,is it a straight swoop or do i need to do any mods to it ,cheers

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    Re: info on using a mazda rx8 gearbox on cozzy engine

    you can get an adapter plate which will connect the engien and box, but i think you would need to use a smaller pinto sized flywheel and starter

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    Re: info on using a mazda rx8 gearbox on cozzy engine

    There's a guy on here called Freddy686868 and he does a conversion plate to mate the two together. I'm doing it with a zetec engine which has the same stud pattern as the yb block. You use your flywheel and clutch as it fits the spline on the rx8 box perfectly.
    Do a search for rx8 gearbox and you'll find the thread.

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    Re: info on using a mazda rx8 gearbox on cozzy engine

    Ah ok. Seems I may be wrong about the flywheel. Graham tends to know his stuff pretty well. I wasn't aware that the yb flywheel wasn't suitable but the spline is definitely 23 like type9.
    Sorry if I've given a bit of bum info here!

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    Re: info on using a mazda rx8 gearbox on cozzy engine

    yes clutch spline is the same but yb flywheel is bigger in diameter than pinto and thus the yb starter is located further away from the engine, so if you use one of freedy's adapaters the yb flywheel is no good

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    Re: info on using a mazda rx8 gearbox on cozzy engine

    hi guys thanks for the info so just the flywheel has to be changed

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    Re: info on using a mazda rx8 gearbox on cozzy engine

    sort of, you would obviously need to use a pinto sized clutch, which may give you big issues if your yb is still turbo charged, the other problem you face is a pinto flywheel has 6 bolt fitting and the yb one 9 bolt, although you can buy pinto sized 9 bolt flywheels

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    info on using a mazda rx8 gearbox on cozzy engine

    Quote Originally Posted by Graham View Post
    yes clutch spline is the same but yb flywheel is bigger in diameter than pinto and thus the yb starter is located further away from the engine, so if you use one of freedy's adapaters the yb flywheel is no good
    This is spot on I have both T5, rx8, T9 on rs bellhousing and the cossy flywheel and bell housing is considerably bigger but does fit in the rx8 bellhousing it just needs someone to make a decent plate. I have been measuring to make my own but it was to be a one off effort and little time so little progress.
    Last edited by wildo105e; 15-11-2015 at 11:31.

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    info on using a mazda rx8 gearbox on cozzy engine

    Will a rx8 box take decent power though?
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    Re: info on using a mazda rx8 gearbox on cozzy engine

    Some RX8s have been charged to 600bhp so I believe, so should be up to most Cossies
    You can use the YB flywheel with Freddies adaptor plates as my mates just fitted one into his kit car but needed to make a couple of alterations in order for it to fit.

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    Re: info on using a mazda rx8 gearbox on cozzy engine

    the only thing i would say though is the rotary gets its power from revs, so a 600bhp rotary will not make the same kind of torque that a lesser powered yb can

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    Re: info on using a mazda rx8 gearbox on cozzy engine

    I've broke one with 2.5 turbo duratec running 335 hp at wheels 300 ft lbs so don't recon they will take cosworth power rotary engine has no torque gone back to t5 box now

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    Re: info on using a mazda rx8 gearbox on cozzy engine

    Quote Originally Posted by Lmr025 View Post
    I've broke one with 2.5 turbo duratec running 335 hp at wheels 300 ft lbs so don't recon they will take cosworth power rotary engine has no torque gone back to t5 box now
    Do a google search and the drifters are using them as they are suppose to be bullet proof. Not my words but theres.
    I should imagine it would be man enough to take the 300-350 of most cossies.

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    Re: info on using a mazda rx8 gearbox on cozzy engine

    Quote Originally Posted by MK1 madness View Post
    Some RX8s have been charged to 600bhp so I believe, so should be up to most Cossies
    You can use the YB flywheel with Freddies adaptor plates as my mates just fitted one into his kit car but needed to make a couple of alterations in order for it to fit.

    I assume that would be to cut out the starter and move outwards then weld back with some extra pieces in etc as that is the only way it will work using the cossy flywheel. It may actually be easier to do this than make the plate from scratch I assume the cossy starter has the same bolt pattern to the pinto ? Might nip in the garage to check

    does anybody what the gearbox is officially rated at

    I was planning a mild cossy engine so i reckon the gearbox will be up to it i think 250 bhp cossy power in a mk1 escort i am sure that will be entertaining enough for me.

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    Re: info on using a mazda rx8 gearbox on cozzy engine

    I will find out exactly what he done for you tomorrow. Hes Using a 200 block.
    Mine will be a 205 block, I don't know much about Cossies, He will be building my engine/box up... Im more of a vauxhall fan. But he wouldnt let me stick it under the bonnet of the Ford

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    Re: info on using a mazda rx8 gearbox on cozzy engine

    Quote Originally Posted by wildo105e View Post
    I assume that would be to cut out the starter and move outwards then weld back with some extra pieces in etc as that is the only way it will work using the cossy flywheel. It may actually be easier to do this than make the plate from scratch I assume the cossy starter has the same bolt pattern to the pinto ? Might nip in the garage to check

    does anybody what the gearbox is officially rated at

    I was planning a mild cossy engine so i reckon the gearbox will be up to it i think 250 bhp cossy power in a mk1 escort i am sure that will be entertaining enough for me.
    If somwone sends me a dust shield off a cossie and sends it to me i can get the starter possition drawn up and cut out easy enough.

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    Re: info on using a mazda rx8 gearbox on cozzy engine

    Quote Originally Posted by freddy686868 View Post
    If somwone sends me a dust shield off a cossie and sends it to me i can get the starter possition drawn up and cut out easy enough.
    I have one pm me some details
    Last edited by wildo105e; 16-11-2015 at 00:31.

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    Re: info on using a mazda rx8 gearbox on cozzy engine

    Quote Originally Posted by wildo105e View Post
    I have one pm me some details
    already sorted sue4867 has one on the way. Thanks for the offer though!

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    Re: info on using a mazda rx8 gearbox on cozzy engine

    no worries, count me in for one

    the dust cover has the bottom half of the crank area left in maybe worth seeing if this can left in, does that make senses ?

    Last edited by wildo105e; 17-11-2015 at 10:01.

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    Re: info on using a mazda rx8 gearbox on cozzy engine

    Quote Originally Posted by wildo105e View Post
    no worries, count me in for one

    the dust cover has the bottom half of the crank area left in maybe worth seeing if this can left in, does that make senses ?

    not really do you mean the part that bolts to the sump?

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    info on using a mazda rx8 gearbox on cozzy engine



    Does this help ? The area below the crank acts as part of the dust shield I am sur the spacer would fit behind the flywheel. It would mean the spacer possibly being fitted before flywheel.

    The outer black line was the bell housing outline, didn't get much further than this though.
    Last edited by wildo105e; 17-11-2015 at 11:39.

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    Re: info on using a mazda rx8 gearbox on cozzy engine

    Quote Originally Posted by wildo105e View Post


    Does this help ? The area below the crank acts as part of the dust shield I am sur the spacer would fit behind the flywheel. It would mean the spacer possibly being fitted before flywheel.

    The outer black line was the bell housing outline, didn't get much further than this though.
    i see what you mean now. How far is it from the engine to the back of the flywheel as the plate is 6mm thick. I don't want to produce something that will interfer with the flywheel. You could use the dust shield as well as the plate?

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    Re: info on using a mazda rx8 gearbox on cozzy engine

    Quote Originally Posted by sue28965 View Post
    hi guys thanks for the info so just the flywheel has to be changed
    Got the dust shield today . Had a quick nose at the difference in the starter possition too.





    One question though what does everyone want to do with the 4 bottom holeS?


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    info on using a mazda rx8 gearbox on cozzy engine



    This is my t5 gearbox which matches the dust shield.

    Not sure about those 4 holes. It does surprise me that that the starter is so close it's not a 4 x4 dust shield is it ??? What adapter plate is that you are comparing with.
    Last edited by wildo105e; 17-11-2015 at 21:43.

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    Re: info on using a mazda rx8 gearbox on cozzy engine

    Quote Originally Posted by freddy686868 View Post
    You could use the dust shield as well as the plate?
    That could work

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    Re: info on using a mazda rx8 gearbox on cozzy engine

    Quote Originally Posted by wildo105e View Post


    This is my t5 gearbox which matches the dust shield.

    Not sure about those 4 holes. It does surprise me that that the starter is so close. What adapter plate is that you are comparing with.

    I'll leave the 4 holes out then.

    The plate is my type 9 pinto plate all of the holes for the block are cock on but oviously the cossie starter is in a different place. I will be looking at the drawings over the weekend for it. And it is the dust cover that sue sent me.
    Last edited by freddy686868; 17-11-2015 at 21:46.

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    Re: info on using a mazda rx8 gearbox on cozzy engine

    I can take measurements if you need to compare against just for sanity, it certainly isn't far off.

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    Re: info on using a mazda rx8 gearbox on cozzy engine

    hi yes it is of a 4x4 cozzy

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    Re: info on using a mazda rx8 gearbox on cozzy engine

    Quote Originally Posted by wildo105e View Post
    I can take measurements if you need to compare against just for sanity, it certainly isn't far off.
    If you could take a few measurements that would be great but i would imagine a 4x4 one would be the same as a 2wd one?

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    Re: info on using a mazda rx8 gearbox on cozzy engine

    Quote Originally Posted by freddy686868 View Post
    i would imagine a 4x4 one would be the same as a 2wd one?
    the gearbox and flywheel are different so if that affects starter position ?? You can however swap a 4 x 4 flywheel for a 2wd one when fitting the 2wd T5 box if that helps as the engine is the same mounts etc. I am not sure if you can use a 4 x4 flywheel in a T5 box tho.

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    Re: info on using a mazda rx8 gearbox on cozzy engine

    Quote Originally Posted by wildo105e View Post
    the gearbox and flywheel are different so if that affects starter position ?? You can however swap a 4 x 4 flywheel for a 2wd one when fitting the 2wd T5 box if that helps as the engine is the same mounts etc. I am not sure if you can use a 4 x4 flywheel in a T5 box tho.
    have you got a 2wd shime/dust plate you could send me to compare then please so i can check if they are in the same possition? I would imagine a 2wd and 4wd have the same ring gear though don't they?

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    Re: info on using a mazda rx8 gearbox on cozzy engine

    I sure can, the flywheel is probably the same size i think it may be a weight issue between the 4wd and 2wd ??? send me you address etc and i will see if i can get it away tomorrow

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    Re: info on using a mazda rx8 gearbox on cozzy engine

    just had another look at the pics, on mine look at the top bolt hole on the starter and the block bolt hole just above then compare to the 4x4 one. It looks a larger gap on mine (well to me it does)

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    Re: info on using a mazda rx8 gearbox on cozzy engine

    any more discussion on power/torque the RX8 box can handle?

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    Re: info on using a mazda rx8 gearbox on cozzy engine

    Quote Originally Posted by Graham View Post
    yes clutch spline is the same but yb flywheel is bigger in diameter than pinto and thus the yb starter is located further away from the engine, so if you use one of freedy's adapaters the yb flywheel is no good
    Graham, I wanted just to clarify something here and maybe it's a silly question but I thought the 2wd flywheel would be fine with the RX8 gearbox. The larger cossy flywheel fits in the RX8 bellhousing so using the adapter plate, standard 2wd clutch and pressure plate on a n/a cosworth it should work with the standard 2wd starter. As the clutch is bigger than a pinto then it's should be adequate for a mild yb. I'm trying to understand why the yb flywheel would be no good on a n/a cosworth or pinto with a cosworth crank.
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    Re: info on using a mazda rx8 gearbox on cozzy engine

    I think most people use a pinto size/ type flwheel on a n/a cossy yb as they are connecting it usually to a T9 gearbox. The T5 box doesn't like revs (so i am told) also i am sure it is probably down to rotating mass as the YB is a big old thing. on a YB n/a you wouldn't need all that mass or the bigger clutch ?? On the othe other hand if you can lighten the YB flywheel to suit a n/a yb then it is a good fit for the RX8 box. I am just in the middle of bolting mine up to the block for a trial fit with 2wd flywheel and clutch and the plates look good so far just need to sort out the right bolts which go in side the bell housing holding theplate to the pinto block. there may be a need to releive the bell housing slighlty even with cap heads. Not got to the starter motor yet but it looks like a trim in the bellhousing maybe needed.

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    Re: info on using a mazda rx8 gearbox on cozzy engine

    Quote Originally Posted by bunta20v View Post
    Graham, I wanted just to clarify something here and maybe it's a silly question but I thought the 2wd flywheel would be fine with the RX8 gearbox. The larger cossy flywheel fits in the RX8 bellhousing so using the adapter plate, standard 2wd clutch and pressure plate on a n/a cosworth it should work with the standard 2wd starter. As the clutch is bigger than a pinto then it's should be adequate for a mild yb. I'm trying to understand why the yb flywheel would be no good on a n/a cosworth or pinto with a cosworth crank.
    as long a you have an adapter pate to suit a yb flywheel your be ok, if the adapter if for a pinto flywheel then its a no go, because the starter position is different

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    Re: info on using a mazda rx8 gearbox on cozzy engine

    Quote Originally Posted by Graham View Post
    as long a you have an adapter pate to suit a yb flywheel your be ok, if the adapter if for a pinto flywheel then its a no go, because the starter position is different
    I have now made plates for the 4wd cossie, 2wd cossie and the pinto engine now as it seams that everyone has a different size flywheel. Which is odd as i though the 4wd and 2wd cossie flywheel were the same diameter?

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    Re: info on using a mazda rx8 gearbox on cozzy engine

    I k ow this thread is as old as the pyramids but do you do an rx8 adapter plate to suit the cosworth flywheel and clutch etc. Thanks.

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    Re: info on using a mazda rx8 gearbox on cozzy engine

    Freddy ain't been back to the site since May last year, so unless someone messages him, AND he see's it . . . . .you are unlikely to get an answer!

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