Harris Marine Forum - Tech Questions

Tuning Jet Unit to Ford 302

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    NoviceMatt

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    Hi I am having a few issues with getting the most out of my motor / jet combo. I have a 4.2M Aitcheson hull with a Ford 302 in it matched to a 773 with a Scott nozzle. The original combo was a 18 front followed by two 19's and a 96mm nozzle. This really struggled to get out of the water so changed the front impellar out to 21 and left the two 19's in behind it. Initially left the nozzle at 96mm, certainly got out of the water a little better but not by that much, revved out to 4000rpm. Then decided to pull the liner right out and opened the nozzle right out - this helped a little more, rev's out now to 4600rpm and does about 75KM on GPS. What I am after is more perormance right out of the hole. The engine almost seems to free rev right up to 4000rpm then sit till the second barrel comes in on the holley before the boat really gets out. What are your thoughts as to how I can get a better match?

    Thanks
    MAtt

    Posted 11 years ago    #                  
  2. Mike
    Mike

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    Hi Matt, Are the impellers all std hamilton ones? Do you have a pic?

    Mike

    Posted 11 years ago    #                  
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    NoviceMatt

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    Hi Mike, Yep all Standard Hamilton impellars, brass with stainless tips all recently sharpened and tipped.

    Thanks
    Matt

    Posted 11 years ago    #                  
  4. Mike
    Mike

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    You realy need a bullet impeller in the front, they are the best upgrade you can do and they are 100% guaranteed to work or we take them back. A stainless one is $695+gst. :big_smile:

    Mike

    Posted 11 years ago    #                  
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    NoviceMatt

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    Hi Mike can you please send me down a bullet, best address is probably care of

    Mt Difficulty Wines
    Felton Road
    RD2
    Cromwell

    Thanks

    Matt

    Posted 11 years ago    #                  
  6. Mike
    Mike

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    Hi Matt give us a call at work. 033270923 and Dawn will organize for you :big_smile:

    Mike

    Posted 11 years ago    #                  
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    xiaofeng

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    Posted 8 years ago    #                  

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