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BrendanD

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Posts posted by BrendanD

    Engine rebuild and camshaft options

    in Engine

    Posted

    Eeek... So thats what was causing your 'tapping noise' and scoring on the bore/ piston damage.
    Looks like a ring seized then freed itself up.

    I wouldn't fiddle with camshafts to be honest. A good Mk3 engine with good fuelling and an accurate spark pulls really well.
    My new Mk 3 had a stock set up and was greatly improved by electronic ignition (a 123) refurbed NOS carbs and an electric fuel pump.

    I think once you start going down cams/needles/ manifolds you are in for a lot of pain...
    Regards
    Brendan

    Engine rebuild and camshaft options

    in Engine

    Posted

    Eeek... So thats what was causing your 'tapping noise' and scoring on the bore/ piston damage.
    Looks like a ring seized then freed itself up.

    I wouldn't fiddle with camshafts to be honest. A good Mk3 engine with good fuelling and an accurate spark pulls really well.
    My new Mk 3 had a stock set up and was greatly improved by electronic ignition (a 123) refurbed NOS carbs and an electric fuel pump.

    I think once you start going down cams/needles/ manifolds you are in for a lot of pain...
    Regards
    Brendan

    Carb issues

    in Engine

    Posted

    2880 wrote:
    Evening all !
    Hi Sam,
    comments below.

    Got the GT6 out today & unfortunately it drove like a bag of shite.

    I think it's running a little rich as when you let off the throttle from around 3500 - 4000 I got a few pops / bangs. It also seems to hesitate on acceleration. Is it possible to adjust the mixture on the CDSE stromberg carbs ? According to my manual, there should be a mixture screw visible from the underside of the carb, I've just got a blank installed where they reference.
    Yes but with a special allen key type tool from the top via the dash pot - however you shouldn't need to if it was running ok.

    Other info / symptoms

    I've recently fitted a HUCO electric fuel pump, the output should be regulated at 2.1PSI. Is there any possibility it would be putting out more ?
    unlikely, I have a hulco and its fine.

    What would be the effect of putting in too much damper oil ? I topped both carb dampers up today. Don't think I put too much in, but could be worth noting.
    nothing

    Can the starter box area of the CDSE stromberg carb be rebuilt ? I'm convinced there's a small leak around here as it's very discolored with fuel.
    the starter box can be disassembled and cleaned. you'll need a new gasket. they can get worn and continually leak fuel into the carb causing too rich a mixture. the metal disc inside is not obtainable so you'd need a 'good' used one.

    What would be the symptoms of the emission control bit on the side of the CDSE carb failing ? Would this cause the mixture to richen ?
    No, the opposite. If the temp compensator sticks open it weakens the mix at idle and causes erratic running. ARE YOU SURE its running rich?

    I can replicate the issue statically, by moving the throttle control arm on the actual carbs, after revving up the back carb drips fuel out of the air filter quite a bit for around 20 seconds or so. Never happened before.
    You have a sticking needle valve and the float chamber is flooding!!!

    Would you guys go for a rebuild ? Or I'm tempted by a set of CD175 stromberg carbs. Obviously just putting on bigger carbs won't isn't the sole answer for more power, but how much of a difference might I see ?
    NONE on a standard engine - don't even go there.

    Lot of questions I know, however it's easier for me to put it all up now. To hopefully come to the solution quicker. There's a few photo's attached to help.

    Thanks in advance,
    Sam.


    Sam, lots of people will say 'ditch the strombergs' and get SUs fitted. I like the Strombergs and I refurbished mine quite easily with a kit. You could also get a refurbed set for £275 from Andrew Turner. I would say you have a combination of issues, but most likely to start with a sticking needle valve.

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