PRE MIX ratios/ myth/ facts READ

Discussion in 'Engine' started by 4cfed, May 20, 2009.

  1. imaghostx

    imaghostx New Member

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    Agreed ive been runnig 32:1 for some time with no problems on a fresh bore and piston.
     
  2. Alana1

    Alana1 New Member

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    Nice article, I read every word and understand most of it. Thanks a bunch for all the info
     
  3. blastersharpe

    blastersharpe New Member

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    I'm well confused over this lol....
    I put 175ml to 5 ltrs or petrol
    Is that ok? I don't get all this 30:1
    I thought with 175ml of 2stroke oil to 5 ltrs of petrol was 35:1 so 175:5
    But I guess not :s

    Can someone please help
     
  4. blastersharpe

    blastersharpe New Member

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    I'm well confused over this lol....
    I put 175ml to 5 ltrs or petrol
    Is that ok? I don't get all this 30:1
    I thought with 175ml of 2stroke oil to 5 ltrs of petrol was 35:1 so 175:5
    But I guess not :s

    Can someone please help
     
  5. best

    best Active Member

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    It is so easy when you work in Metric:
    32:1 = 32ml petrol to 1ml of oil, or 32L of petrol to 1L of oil, or 3.2L petrol to 100ml of oil.
    So do the math the other way around, 32:1 would be 1/32 or 1:0.03125 or 31ml of oil for each litre of petrol.
    So, multiply that by 5 = 156ml for 5 litres of petrol for 32:1.
    the difference between 30:1 and 35:1 is pretty much inconsequential.

    Now, the numbers you quoted, 5 litres petrol and 175ml oil = 5000:175 = 29:1
    Remember, the ratio is petrol:0il and has to be in the same units.

    Steve
     
  6. blastersharpe

    blastersharpe New Member

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    Ok I think I get it...cheers for getting back to me :)
     
  7. Atvguy22

    Atvguy22 Fasttrak

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    Quick question here,
    On the oil tank on my blaster there are 2 wires running from the top of it I believe they were green & black.. They run up into the headlight some place, what is the meaning of these 2 wires? I'm going from oil injection to premix & I'm wondering what these 2 wires purposes are??
    Thanks
     
  8. best

    best Active Member

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    They light up a "LOW OIL" light from a tank sensor.

    Quite frankly, I think that the vast majority of people are ill advised to remove the oil injection system. It is a wonderfully reliable system and makes for long engine life. I wish I had it on my KTM and I certainly will on my stock Blaster motor.

    Steve
     
  9. B S

    B S New Member

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    Very nice write up
     
  10. scooby82882

    scooby82882 New Member

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    Very nice write up indeed. Also loved reading about keeping the oil injection intact. I just purchased an 03 thats still stock and figured I'll leave it how it is, if it blows up at some point no worries, then it'll just get a bigger motor 250 maybe bigger
     
  11. Herpderplol

    Herpderplol BRRAAAAAAAAAPP

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    Nice you are finding some good reading.

    When you blow it up, you can rebuild it. It will not make your blaster a 250 in any way, but more like a 202cc.

    Unless you get a 240cc big bore kit I:I
     
  12. scooby82882

    scooby82882 New Member

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    Said the 250 or bigger thinking if I do end up blowing it that I'd keep an eye for an older 250dirtbike or something of the sort
     
  13. 89blaster89

    89blaster89 Member

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    Or use a dt 200 topend
     
  14. best

    best Active Member

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    My son Neil (Triplecrown) and I are building a 240 Blaster as we speak, and I own a 250 KTM powered Blaster. The powerful 250 motor swapped into the Blaster is not the answer to all prayers. It does not have the excellent gearbox the Blaster comes with. I would gladly trade a few HP for better gears. The 17hp Blaster is a wonderful starting ground for a excellent machine and has no problem making over 30hp in a cheap and reliable fashion on regular low octane fuel.

    Neil is making a DT200 powered Blaster, with Blaster gearbox and working powervalve. You may recall he has run this engine before, but with the powervalve fixed open. This motor is 32hp stock.

    As for the oil pump, I`d keep it. Oil injection has proved itself on long distance road vehicles and in snowmobiles in rugged wilderness conditions. It is considerably less prone to human errors than pre-mixing. Pre-mixing has its place, but I get really tired of the `pump failure` parroting I hear here from adolescent experts. It just isn`t true. Any so called failure I have seen has usually been a fuel jetting error, wrong oil used, pump not primed after empty, or some other operator error blamed on the pump because he couldn`t shoulder the responsibility.

    If you listen to the old hands who repeatedly chime: LEAK TEST, PLUG CHOP! you will not blow up your engine. The only other thing to listen for is piston slap as the skirts are prone to break off if the clearance is too much and revs too high. Other than that these are wonderfully reliable machines, oil injection pump and all.

    Steve
     
  15. jeharrisonjr

    jeharrisonjr New Member

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    * (2) Additionally. Husqvarna did some testing in the mid 70's that was very interesting. They put 3 identical stock engines on a dyno and ran them for several days at varying RPM and load conditions. Then both motors were torn down and inspected. The engine running CASTOR based oil had the least wear, followed by the synthetic oil, and finally the engine running standard 2-cycle oil.


    They had Synthetic oil in the 70's? Has anyone run this same test more recently? Standards and tolerances were not very good or reliable in the 70's or 80's so thats why im curious.
     
  16. Awk08

    Awk08 Administrator Staff Member Technician

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    lets see them run them same tests in the below 30 degree temps that I, and many others experience in the winter.
    it's a known fact the castor based oils like to separate from the fuel in those temps, and do not like being mixed and matched with other non castor oils.
    did they report the carbon buildup findings ? long term ?

    the synthetics/blends formula's have made leaps and bounds since the 70/80's.
    I'm guessing the castor is the same 'ol formula ?
     
  17. Zbskater400

    Zbskater400 Member

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    Wow never thought of all this. Very helpful and very very good Info here ! :rolleyes::D
     
  18. 99BlastR

    99BlastR New Member

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    I have a 99 blaster that I recently went. 02 over with piston I have 3/8 inch Reed spacer FMF pipe and i run a 32: 1 mixtureI am currently at a 260 jet it seems to sputter when it hits the powerband still what would you recommend to do up the jet size a few any info would help Thanks
     
  19. Awk08

    Awk08 Administrator Staff Member Technician

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    buy the next few larger size jets, like 270,280,290, start large
    and plug chop down.....
    http://www.blasterforum.com/threads/how-to-plug-chop.53237/
     
  20. 99BlastR

    99BlastR New Member

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    Last edited by a moderator: Mar 9, 2015

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