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Thread: Building a Hot 250 x flow

  1. #1
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    Default Building a Hot 250 x flow

    Hi guys

    Im thinking about building a hot 250 crossflow to swap the 400 od thousand kay one in the ute now, just wondering where to start? The car is a 1992 xf ute.


    Would an E2 head change be worth wile, was thinking bit of a cam change 230/230 @ .50thou 520 valve lift , free flowing exhaust, compression bump up, flow up the intake a bit more, will a carbie change help also or just put a kit thru the standard weber? does it need head work or can i get away with stock ports and rockers etc. Only really looking to spend 1500 on it and after 150ish at the wheels.

    any advice would be great.
    Last edited by HighFaultCurrent; 15-03-2006 at 05:24 PM.

  2. #2
    Forum Veteran sonny's Avatar
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    Default Re: Building a Hot 250 x flow

    go to the cortina certral part of this forum they are mad on the 250's

  3. #3
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    Default Re: Building a Hot 250 x flow

    Build it too hot and it'll be a pig to drive. Trade off a bit of power on the dyno and you'll have a smoother torquer 250 that'll still go hard. Do you mean 150rwhp or 150rwkw as you can get 150rwkw but it will not be as driveable as you would like me thinks. If you are chasing 150rwkw the weber although a great carb cannot flow this much it is maxed out at 130rwkw and restricting a bit even after 110rwkw etc. I'd go 86da block, EF crank (fully couterweighted), 200conrods (which are longer giving a better piston 2 rod ratio), flattops to suit, 'E2' head with 30thou shave, must run 98octane fuel only though and CR is around 11.3:1. Cam would probably need to be crow 2600-5500rpm etc. 4barrel redline manifold, 600holley would be good. Port match the redline to E2 and polish the exhaust side but not inlet as hinders fuel atomisation. Double row timing chain.

    For 150rwhp (if you already have block and weber) all you need is;

    Extractors and 2.5" exhaust $500
    E2 head shave 40thou off for 9.5:1CR great for PULP $80
    VRS gasket set $60-00
    Stage 2 dynotec or crow 2000-5000rpm (great midrange) cam $300
    Double row timing chain $90
    Dynotune weber and replace secondary jet for 12.5:1air/fuel @w.o.t.$170
    This gets 150rwhp minimum with manual and no air/steer and still keeps weber. Cheap power.
    ZAC
    RIP: 1978 TE CORTINA. 4.1L mild 250xflow, T5, welded 2.92:1diff, 16" wheels, Lots of fun was had in the old beast...

  4. #4
    Forum Veteran Chr!s's Avatar
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    Default Re: Building a Hot 250 x flow

    ive got a xflow which i put a "D" alloy head from a xf ute. i got it shaved 20thou and bolted it on.

    then i got a 500 holley and redline manifold, and extractors and 2.5inch exhaust, and got it dyno tuned and jetted down to suit.

    it came up with 110rwhp. remember this is a stock engine with stock cam and all i added was a bit of compression, and more airflow... and i get better fuel economy than before with a 500 holley!!!! (8.5l/100km on highway)

    if i was you id do it cheap and easy like this:

    1) flog off the weber and use a 350 or 450 or 500 holley, with a redline manifold

    2) buy some extractors (mine cost $37.50 on ebay second hand!!!) and get a 2.25inch or 2.5inch exhaust.

    3) search out a second hand engine with an alloy head in good nick ($200?)

    4) put a decent midrange came in it...

    5) while the heads off get it cracktested etc and shaved to give you 10:1 compression... (is that safe?)

    youll get your 150rwhp on decent fuel...

    i also changed to a celica fivespeed at the same time and it helped. those autos are so doggy... and maybe look at gettign rid of the fan and getting thermos...

    personally i reckon that 110rwhp is pretty darn boring... i dont mind it but id much rather around 200rwhp. thats when things would get fun but then u start breaking things and dont get the economy that i get... i got a 3.5 diff in the garage - that would be alright...
    07 Fairmont Ghia for family
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  5. #5
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    Default Re: Building a Hot 250 x flow

    well i have a stock motor with exhaust and filter and that got 110 rwhp on the dyno. thats just stock.

  6. #6
    Forum Veteran Chr!s's Avatar
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    Default Re: Building a Hot 250 x flow

    whoopdidoo.
    07 Fairmont Ghia for family
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