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Thread: decat.... 5.5K RPM..... tink tinkkk tiinnk tink

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    Looser Konan555's Avatar
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    decat.... 5.5K RPM..... tink tinkkk tiinnk tink

    Would you believe it; Taking out the cats and several nasty big silencers has lead me to new world of det. Really surprised me that it's made that much difference actually.

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    Administrator Moby-Dick's Avatar
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    bit of a timing tweak needed ?
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    Va Va Voom Lowe's Avatar
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    Strange, never known that before. Sometimes the timing does need a little tweak to get the best from the decat, but never known a car to det! Must of been some crappy exhuast!

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    www.5lab.co.uk
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    could be egr not working any more, as that has an effect on advance and so on (if that was there)

    or possably the lack of back-pressure means more exhaust gas is escaping, so more air is getting in (and with it more fuel). more fuel in the cylender = more likely to pink..
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    Looser Konan555's Avatar
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    No EGR to fail

    It's not just a straight decat job. It's kind of a bit of pipe that makes its way from the down pipe to the manifold. Yes, I am a cheapskate and have earplugs Fortunately, it's not of an era where all this calculated exhaust stuff really comes in. So long as the manifolds on OK.

    For an old sod, it's quite a high compression engine as well, somewhere around 10.5:1 I think. Not a normal issue through, even the turbo conversions ran on stock compression OK.

    Can't tweak the timing on it, it's probably just running a little lean on WOT at the top end, I'll give the pressure reg a twist

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    I got way less than half!

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    Quote Originally Posted by Konan555 View Post
    No EGR to fail

    It's not just a straight decat job. It's kind of a bit of pipe that makes its way from the down pipe to the manifold. Yes, I am a cheapskate and have earplugs Fortunately, it's not of an era where all this calculated exhaust stuff really comes in. So long as the manifolds on OK.

    For an old sod, it's quite a high compression engine as well, somewhere around 10.5:1 I think. Not a normal issue through, even the turbo conversions ran on stock compression OK.

    Can't tweak the timing on it, it's probably just running a little lean on WOT at the top end, I'll give the pressure reg a twist
    Allow me to translate guys.

    Paragraph one: My car has no exhaust boxes. It's loud, I'm going to go deaf. My car will run without any and I can't be arsed to get it done properly.

    Paragraph 2: My old engine is running quite a high compression ratio. I'm suprised turbo conversions lasted more than 5 minutes without blowing up because of this.

    Paragraph 3: The timing can't be changed. The air/fuel mixture is probably running too lean when I'm giving it beans at high RPMs. I'll increase the fuel pressure a bit and hope it's enough to stop the engine going bang.

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    Drop it like it's hot Howard's Avatar
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    Administrator Moby-Dick's Avatar
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    nice translations

    Ivan get it Megasquirted and you can tweak to your hearts content.
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    F.A.S.T. Butuz's Avatar
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    Make sure your fuel pump is up to the job, or uppin the FPR will not help

    Butuz

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    HEXUS.timelord. Zak33's Avatar
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    can I just point out that having more fuel helps reduce pinking. Make a mixture a tad richer and it won't pink as much, and it'll help reduce burned valves.

    My old Sunbeam Ti (on twin 45's) with a wild cam ran an uber compression and one box exhaust, and it needed to be uber rich to stop it overheating and pinking, and had to have platinum electrode plugs to burn the fuel without clogging up.

    Fastest damn engine ever.....one rally per engine retune

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    Administrator Moby-Dick's Avatar
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    yeah changing to a different grade of plugs may help ?

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    Senior Member Tumble's Avatar
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    Quote Originally Posted by Butcher View Post
    It's like it's a foreign language or something!
    Ahh.. the dialect of English known as "Engineering" Great isn't it?

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    Lowe, i got most of that but what is 'tink tinkkk tiinnk tink'!?

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