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Thread: Under bonnet fuel

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    Under bonnet fuel

    Good evening chaps, just starting to get to the nice bits....discressionary spending!
    Bought a 6 branch SS exhaust and looking at the inlet side.
    Upgraded the cam from Newman cams...genius old company.. to fast road
    Looking at the AH Spares triple weber conversion...is this overkill.....the car will be last nut and bolt rebuild but not a show car. I want it to be fun and a drivers car.
    Suggestions/help chaps... always appreciated!!!
    Regards Al
    If you want to see the car I bought from Denis Collins!!... Fast N Loud season 4 Ep 12..mine is the Blue one
    Will post pics at some stage
    Regards AL

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    Re: Under bonnet fuel

    When I had a discussion about what to do with my engine with Denis Welch, I had headers and fast road cam, he recommended 2 HD8s over triple Webers because the useful range of the SUs was better. The Webers are better at full throttle, of course. I drive fast, but only go full throttle when I have the room, which is not often enough.
    John, BN4

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    Re: Under bonnet fuel

    Here in the Colonies, with mile upon mile of open, often straight road, highways and freeways the 3.4:1 rearend has longer legs (assuming you have stock 3.9). 'Off-the-line' acceleration suffers a little--Big Healeys aren't generally good drag racers anyway--but the lower noise and vibration at highway speeds is welcome, and first and second gears are more usable (IMO). The uprated OD accumulator from DWM offers a little quicker OD engagement, and I just learned AH Spares has an accumulator with an O-ring instead of iron rings, which should last longer (although I just replaced my accumulator at 205K miles and, although there was some scoring, it was good enough that I 'donated' it to a needy owner). Well-trued and balanced wheels and tires will help minimize the dreaded 'scuttle shake.'

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    Re: Under bonnet fuel

    Twin HD8s work great with a fast road cam. I had that set up on my car then upgraded to the the DWR Rally cam and Triple Weber’s. The HD8 provide more than enough fuelling for the fast road set up. The Webers provide an instant throttle response due to the accelerator pump but are overkill for a road car with a fast road cam. They do look good though.

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    Re: Under bonnet fuel

    From SU CARBURETTERS TUNING TIPS & TECHNIQUES:

    SUsizeConfigHp.jpg
    Steve Gerow
    Altadena, CA, USA
    1959 AH BN6 2-seat roadster / 1974 TR6 Emerald Green
    Check out my galleries:
    http://www.pbase.com/stevegerow


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    Re: Under bonnet fuel

    Really good guide thanks

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    Re: Under bonnet fuel

    One thing about triple Webers is to set them up properly it's really helpful to have a specialist with a selection of jets, emulsifier tubes, etc and a rolling road. SUs are much easier to set up.
    Rick

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    Re: Under bonnet fuel

    Recently had the engine in my BJ7 rebuilt. Gas flowed head, fast road Kent cam, steel flywheel, Omega pistons, 2 x HD8 carbs, bespoke 6 branch exhaust manifold from Zero, big bore s/s exhaust. Set up on rolling road achieved 172bhp at flywheel. Goes really well, and makes a terrific noise. I have pertronix ignition. I also had the radiator re-cored, and temperature stays at 190C even in the current heatwave

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    Re: Under bonnet fuel

    Quote Originally Posted by Jonstock View Post
    I also had the radiator re-cored, and temperature stays at 190C even in the current heatwave
    You may be running a little hot.
    Rick

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    Re: Under bonnet fuel

    Just curious, what is considered a heat wave in England? We've averaged 95-100degF here in the Central Valley of California for the last couple months (and we've hit 105 more than a few times).

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    Re: Under bonnet fuel

    Quote Originally Posted by Bob_Spidell View Post
    Just curious, what is considered a heat wave in England? We've averaged 95-100degF here in the Central Valley of California for the last couple months (and we've hit 105 more than a few times).
    My theory has long been that anytime the mercury hit 55F, BMC did their hot-weather testing. You know, to really put a strain on the cooling system - take it to the limit, exceed any expected actual use!
    Reid Trummel
    Editor, HEALEY MARQUE magazine

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    Re: Under bonnet fuel

    I went to school in the UK in the sixties and when it reached 84℉ we were allowed to take our blazers off and, if you were daring, loosen the tie a smidge!

    Danny

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    Re: Under bonnet fuel

    Quote Originally Posted by Dandare View Post
    I went to school in the UK in the sixties and when it reached 84℉ we were allowed to take our blazers off and, if you were daring, loosen the tie a smidge!

    Danny
    Did that ever happen? I mean, the temp reached 84F. Must have been summer school in Cornwall, eh?
    Reid Trummel
    Editor, HEALEY MARQUE magazine

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    Re: Under bonnet fuel

    Anything above 80 degF

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    Re: Under bonnet fuel

    Bob, I spent most of my life about 20 miles south of you and I can attest that nothing quite feels like driving a Healey with the top down at 5 PM in 105 degrees. You've got furnace blast heat coming at you from all angles.
    Rob Glasgow

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    Re: Under bonnet fuel

    Quote Originally Posted by Rob Glasgow View Post
    Bob, I spent most of my life about 20 miles south of you and I can attest that nothing quite feels like driving a Healey with the top down at 5 PM in 105 degrees. You've got furnace blast heat coming at you from all angles.
    Worst for me was driving through Death Valley in the early summer near (aptly-named) Furnance Creek. Temp was 115degF in the shade and, in addition to the mirages I was hallucinating; my navigator kept misting me to keep me from passing out. Pulling the long grade up the Panamint Mountains the gauge read a steady 212, and that's with the heater on full blast. Still, we made it, and there was a bus and several cars on the side of the road with their bonnets up.

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