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Thread: holden six power?

  1. 19th January 2012, 10:49 PM #1
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    holden six power?

    hey guys, im looking to change my 2.25 petrol for a 186 and wondered if im really going to gain that much more power? ive got 35 inch tyres on the vehicle so the gearing has gone up so the 186 revs shouldnt be an issue. i have a 7.1 head on the 2.25. has anyone decked these heads and was it worth doing? i would rather keep the the 2.25 but i need to be able to do 80kmh at least. any help would be appreciated
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  2. 19th January 2012, 11:28 PM #2
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    worked 2.25

    Hi army2a

    Try a search on this, as I seem to recall a thread on this subject.

    Port and polish, cam, a bit of compression, better dizzy, carbie, balance and so on .

    Could be fun to do the 2.25 up.
    .
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  3. 20th January 2012, 05:35 AM #3
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    80 is the optimal cruise speed for a series you wont hold it on the hills but if you cant hit it normally then your engine is sick and needs some love.

    getting the heads done to up the comp a little is a good idea and will be cheaper than trying to install the holden donk.
    Dave

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  4. 20th January 2012, 06:10 AM #4
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    Have a flick through here before pulling it out

    Land Rover Performance Tuning - Power Plus - Land Rover cylinder heads, camshafts, SU Carb system, 2.8 engines - ACR - Automotive Component Remanufacturing Ltd

    CC
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  5. 20th January 2012, 10:28 AM #5
    wagoo
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    Quote Originally Posted by wrinklearthur View Post
    Hi army2a

    Try a search on this, as I seem to recall a thread on this subject.

    Port and polish, cam, a bit of compression, better dizzy, carbie, balance and so on .

    Could be fun to do the 2.25 up.
    .
    A mate of mine did that, minus cam and carb,but with tuned length extractors on his 2 1/4 series 2 swb about 30 years ago and it would blow the doors off my 186 holden engined 80 inch Series one.
    bill.
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  6. 20th January 2012, 11:56 AM #6
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    The 2.25 can be made to go fairly well, however unless you switch to gas or PULP you will have problems with pinging/detonation offroad.
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  7. 20th January 2012, 12:22 PM #7
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    NO2 would be a laugh

    Now for something really weird, how about doing nothing except adding a bottle of NO2 and a little plumbing !!!
    Last edited by wrinklearthur; 20th January 2012 at 08:56 PM. Reason: posted twice and wanted to fill the gap
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  8. 20th January 2012, 12:24 PM #8
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    back to the begining

    Quote Originally Posted by isuzurover View Post
    The 2.25 can be made to go fairly well, however unless you switch to gas or PULP you will have problems with pinging/detonation offroad.
    Its a big wheel that doesn't turn once!

    Read this thread by Blknight.aus

    http://www.aulro.com/afvb/technical-...rbo-2-25d.html

    .
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  9. 20th January 2012, 01:32 PM #9
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    Quote Originally Posted by wrinklearthur View Post
    Its a big wheel that doesn't turn once!

    Read this thread by Blknight.aus

    Turbo on a 2.25D..

    .
    Not sure what you are trying to say/suggest?

    However I recommend that army2a doesn't follow Dave's idle speculations in that thread as he will likely end up with something that is (almost?) impossible to start and has less power than a stock 2.25P. If you were suggesting a diesel swap, then bolting in a 200 or 300 tdi would make much more sense.

    Back on the worked 2.25P, one useful mod that was prompted by your link Arthur, would be fitting a 2.25D flywheel to a 2.25P. The 2.25D flywheel is a LOT heavier, so would be useful for ensuring the engine retains/increases low down torque after the mods. Fitting a (stronger) 2.25D crakshaft would be a good idea as well. I gave one to Col Coleman recently, which he may part with if you ask nicely.
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  10. 20th January 2012, 04:03 PM #10
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    down the same path

    Quote Originally Posted by isuzurover View Post
    Not sure what you are trying to say/suggest? .
    Hi All

    Touching on the pre ignition subject would take this thread back into what Dave started in the his thread, using of a turbo to up the horsepower of petrol or diesel.

    If the head planning isn't done to extreme and the distributor timing curve is reset to match the fresh characteristics, some pinking on a hard pull could be tolerated.

    Fitting a heavier flywheel would definitely help smooth out the low to midrange rev pulling, but I think that, in the situation of cut and thrust driving in say, peak hour traffic, it would most likely be detrimental to the fuel economy.

    The best bang you can get for your buck, would be the fitting of a well made set of extractors.
    .
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