Drawthrough Turbo Help - Page 3
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  1. #21
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    stevieturbo is offline
    Given how readily it is backfiring there with almost no throttle input....it really looks like it is getting nowhere near enough fuel

    Can you look in and see if the progression holes or even main jets are even allowing any fuel in from the carb ? Just put safety goggles on so you dont get an eyeful !

    And stick a pressure gauge on the main feed into the carb, but if the float bowl is full it should run for a little bit regardless, unless float level in the carb is far too low.

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  3. #22
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    Does turning the dizzy say 10-20deg either direction of where you have it now make any difference ?

  4. #23
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    Float definitely fills up. Moving the dizzy to advance the ignition brings the revs up.

    I have made progress. The popping through the carb is quite useful! It gives away the leaks. Guess what I found..?



    Bit of a leak there!! I think that might just be the problem, no..? There's also a small leak on the output of the turbo where I have a silicone pipe sealing it, but I can sort that easily enough.

    Next question... How the hell do I seal the turbo housing???

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  6. #24
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    Modern turbos arent sealed the same way stuff might have been in the days of suck through...simply because they dont need to be

    I doubt that leak is your problem, but it is still a problem.

    There are plenty of sealers out there that will be happy with petrol, but silicone is not one of them. A non setting type of sealent might be better, as a good strong sealer may well work, but make it almost impossible to get the compressor cover back off again.

    Or you could maybe have the cover machined to accept an o-ring as you slip it over the backing plate.

    Sealer would be easier of course.

  7. #25
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    It's a pretty big leak though! What type of sealer would work? I only have copper silicone here at the moment. I would have thought that a leak like that would have been the cause of this? There was quite a lot of fuel leaking from it, though as I said there is also a smaller leak on the outlet of the turbo.

    The exhaust gets REALLY hot though, which tells me it is lean.

    Time to put my toys away for the night though I think! I will whip the turbo off ready to try and seal it up, and change the angle of the compressor housing slightly to better suit the inlet and then scratch my head some more!

  8. #26
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    Would this stuff be any good..? Loctite 5922 - Loctite

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    On a blow through system,don't you need a boost referenced fuel system ?

  10. #28
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    Exhaust being really hot shouts that either valve timing is wrong or ignition timing is wrong. ( of course...depends how you're determining "too hot" )

    I'd give something like this a try

    LOCTITE 510 - Gasketing product - Loctite

    or

    LOCTITE 5188 - Gasketing product - Loctite

    Only reason I'd say those over the 5922 is it doesnt really mention chemical resistance which petrol could fall under ?

    Either way you could give it a try, or call loctite and speak to them, they have a helpline to advise what product might suit best.

    But any of those will be better than nothing lol

  11. #29
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    Quote Originally Posted by choppedblownpop View Post
    On a blow through system,don't you need a boost referenced fuel system ?
    His isnt a blow through system

  12. #30
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    Quote Originally Posted by choppedblownpop View Post
    On a blow through system,don't you need a boost referenced fuel system ?
    Only if you are being fancy and aren't just dumping fuel in and hoping it's "about right"

    Just took the turbo to bits. Turns out there is a gasket in there, and it's in two pieces now (must be where I clocked the turbo round). So best get looking for a replacement... WHere can I get gaskets made..? I'm just not good enough at cutting out circles to make a replacement for this! 120mm outer diameter, 117mm inner diameter (though I think I could probably get away with a 121mm outer and 16mm inner). What a headache this is turning out to be!

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