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Thread: MRP 7age/9age 1900cc Stroker Kit

  1. #256
    Junior Member Automotive Encyclopaedia
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    Default Re: MRP 7age/9age 1900cc Stroker Kit

    hi barry we did this years ago with a 4age small port head and changed the inlet track so its on the back of the valve ,with 7age crank offset grind to make it 1920 cc and with quad throttles made 165 kws at 8200 rpm but it still doesnt have the torque of the 3sge beams motor
    he has gone over to 1 of these and is now making 190kws at back wheels at 8000 rpm with some vvti

  2. #257
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    Default Re: MRP 7age/9age 1900cc Stroker Kit

    Yes we'll aware of what a beams can make. There is 1 in nz which makes well over 200kw atw.

    1600 16v Atlantic spec engines push 200-210whp no issues.
    It's known the 16v head can flow well.

    My goal is to push the limits of the 20v head.
    With good flow bench numbers we should be able to get a good result. (280cfm intake)
    1988 Toyota Levin GTZ 10.88 @ 209.57 340kw
    Now 9AGTE 410kw atw
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  3. #258
    Forum Member Grease Monkey
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    Default Re: MRP 7age/9age 1900cc Stroker Kit

    Quote Originally Posted by JustenGT8 View Post
    From what i can ascertain the stock 7A bottom end is a pretty good thing
    The stock 7A-FE bottom end is flawed big time... for turbo aps it's not so bad, but good luck revving it enough to make big N/A power. 1) Oil pass on the stock crank are way under par : rod journals are bigger than a similar 4A and only fed by a single oil hole. Oil supply from the main gallery to the crank main oil pass is not drilled 180 apart so oil feed inside the crank is not constant. 2) Rod bolt will stretch if spun enough to make good N/A power. I've seen enough spun rod bearing and snapped rods bolts to advice against using a 7A crank at all. I'd use any 4A crank as well as basda's stroker crank, but no 7As for me
    KE20 1974 <- Sold -> Thread
    AE95 1990 <- 4A-GZE daily driven wagon...

  4. #259
    how much is Too Much Toyota JustenGT8's Avatar
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    Default Re: MRP 7age/9age 1900cc Stroker Kit

    Quote Originally Posted by bermy View Post
    The stock 7A-FE bottom end is flawed big time... for turbo aps it's not so bad, but good luck revving it enough to make big N/A power. 1) Oil pass on the stock crank are way under par : rod journals are bigger than a similar 4A and only fed by a single oil hole. Oil supply from the main gallery to the crank main oil pass is not drilled 180 apart so oil feed inside the crank is not constant. 2) Rod bolt will stretch if spun enough to make good N/A power. I've seen enough spun rod bearing and snapped rods bolts to advice against using a 7A crank at all. I'd use any 4A crank as well as basda's stroker crank, but no 7As for me
    Cheers, good clarification of the specifics. So even with a flasher crank, how do you overcome the main oil gallery feed issue?
    Lily Simpson 6.7.2010
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  5. #260
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    Default Re: MRP 7age/9age 1900cc Stroker Kit

    The 7a cranks have their limits. Everyone knows that.
    The oil gallery holes in the crank are not drilled for consistant oil flow to the bearings.
    The oil galleries can be modded (drilled) of course and they will survive much longer.

    The bigger 48mm journal is to create more journal overlap to strengthen the crankshaft.
    48mm journal size is actually a good thing "size wise". When being turned over 9000rpm they are more stable.
    We would of gone 48mm on the journals in our crank but then it requires a lot of block clearancing to make it work out, plus its heavier weight wise and there isnt really any thing wrong with the 45mm 4age journal size.

    The honda B series engines use 48mm journals as well.
    1988 Toyota Levin GTZ 10.88 @ 209.57 340kw
    Now 9AGTE 410kw atw
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  6. #261
    Forum Member Grease Monkey
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    Default Re: MRP 7age/9age 1900cc Stroker Kit

    Yep, SR20 do too, but like the 4A and honda B, they have 2 oil holes per rod journal opposed to the single oil hole of the 7A... the single oil hole issue only gets worst as the journal gets bigger.

    And yes you can bore the crank to get a second oil hole, but since the pass between the main and rod journal cannot be rebored, one of the hole in the rod journal will have bias flow compared to the other because of the angle with which it meets the rod journal pass so it's not perfect in anyway.

    P.S. 4A-G journals are 42mm... the rods big ends are 45mm

    Here's a view of the crank drilling... top is 7A crank, bottom is bluetop 4A-G, but all other 4A-G cranks are drilled that way, same with the SR20s and Honda B and almost all performance oriented engines

    KE20 1974 <- Sold -> Thread
    AE95 1990 <- 4A-GZE daily driven wagon...

  7. #262
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    Default Re: MRP 7age/9age 1900cc Stroker Kit

    Yes they are all the flaws of the 7a crankshaft. Only made fow low rpm usage.
    People push them to the limits. Some fail, some dont. All depends on what your using the car for and how hard its driven.
    I have drawings for both crankshafts

    Sorry I got my numbers mixed up on the journals haha.
    1988 Toyota Levin GTZ 10.88 @ 209.57 340kw
    Now 9AGTE 410kw atw
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  8. #263
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    Default Re: MRP 7age/9age 1900cc Stroker Kit

    Just got some feedback from one of our customers running a 9age 20v kit.
    The new engine with no other mods from his 1600cc version to 1900cc netted him 1.5s faster a lap (sorry I didnt ask which track but he says its a new record for his class of racing).
    Much more power through the entire rev range, so he had much more pull out of the corners etc.
    Only problem was his C52 box didnt like the extra power and gave up.

    Looking forward to seeing more of these engines complete and racing! I know of quite a few still in the build which will be ready soon.
    1988 Toyota Levin GTZ 10.88 @ 209.57 340kw
    Now 9AGTE 410kw atw
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  9. #264
    Toymods Events Secretary Too Much Toyota trdee's Avatar
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    Default Re: MRP 7age/9age 1900cc Stroker Kit

    Not much longer for me now. Just a few bits and pieces and it will go to the shop to get built
    1988 AW11 9A-GTE - project #1 | 1980 KP60 4K - project #2 | 1994 UZZ31 Soarer 1UZ-FZE - Cruise missile
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    .....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

  10. #265
    Toymods Events Secretary Too Much Toyota trdee's Avatar
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    Default Re: MRP 7age/9age 1900cc Stroker Kit

    My engine is coming together at last! Block has been tapped for bigger headstuds, oil pump galleries port matched, crank girdle matched up. Just got to machine the bores and then the assembly begins

    1988 AW11 9A-GTE - project #1 | 1980 KP60 4K - project #2 | 1994 UZZ31 Soarer 1UZ-FZE - Cruise missile
    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.....
    Quote Originally Posted by JustenGT8 View Post
    Mono blocs mate....as close to yours as a Ferrari is to a Fiesta

  11. #266
    Forum Member Grease Monkey
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    Default Re: MRP 7age/9age 1900cc Stroker Kit

    ^winning

    can't wait to see it all together

  12. #267
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    Default Re: MRP 7age/9age 1900cc Stroker Kit

    Awesome work. Make sure the main tunnels are lined honed with the girdle torqued up.
    1988 Toyota Levin GTZ 10.88 @ 209.57 340kw
    Now 9AGTE 410kw atw
    www.mrpltd.co.nz - Manon Racing Products
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  13. #268
    Toymods Events Secretary Too Much Toyota trdee's Avatar
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    Default Re: MRP 7age/9age 1900cc Stroker Kit

    will pass it on to le builder
    1988 AW11 9A-GTE - project #1 | 1980 KP60 4K - project #2 | 1994 UZZ31 Soarer 1UZ-FZE - Cruise missile
    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.....
    Quote Originally Posted by JustenGT8 View Post
    Mono blocs mate....as close to yours as a Ferrari is to a Fiesta

  14. #269
    Forum Member Grease Monkey
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    Default Re: MRP 7age/9age 1900cc Stroker Kit

    Subscribed to this madness. Looks like I need to keep an eye out for a 7afe..
    1977 280se S class - Oliveoyl (Built 6.9 dry sump in the build)
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  15. #270
    Toymods Events Secretary Too Much Toyota trdee's Avatar
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    Default Re: MRP 7age/9age 1900cc Stroker Kit

    24psi and about 13deg total timing in the top end due to almost 100deg intake temps

    1988 AW11 9A-GTE - project #1 | 1980 KP60 4K - project #2 | 1994 UZZ31 Soarer 1UZ-FZE - Cruise missile
    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.....
    Quote Originally Posted by JustenGT8 View Post
    Mono blocs mate....as close to yours as a Ferrari is to a Fiesta

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