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Thread: MGB and HIF44 SU Hesitation

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    MGB and HIF44 SU Hesitation

    Hi All-
    77 MGB- Replaced my ZS carb with a Moss SU HIF44 carb. I have serious hesitation on acceleration, but excellent running at higher RPM's. Idle is smooth. Has anyone had a similar experience?
    Any help is greatly appreciated. (THANKS!)

  2. #2

    Re: MGB and HIF44 SU Hesitation

    I ran an HIF6 from an Austin Marina (similar to the HIF44) for several years on my MGB. I used a BBQ needle...which do you have?
    Rick Ingram
    1978 MGB - 1969 MGC - 1974.5 MGB/GT V8 conversion - 1968 MGC - 1972 MGB

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    Great Pumpkin DrEntropy's Avatar
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    Re: MGB and HIF44 SU Hesitation

    Where's Eric when we need him. [img]/bcforum/images/%%GRAEMLIN_URL%%/devilgrin.gif[/img]
    '64 MGB, '67 Lotus Elan S-3 DHC,'69 Lotus Elan +2
    '78 Alfa Romeo Spider-current Daily: O=\*/=O
    '84 300D Turbo-"Diesela"-SWMBO's Daily: OO|≣|OO
    '66 Alfa Romeo GT - Upscale Yard Art: Oo=\*/=oO
    Chaos & Mayhem PTY, LTD..C.I.O. & Floor Sweepervisor

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    Re: MGB and HIF44 SU Hesitation

    Hi-
    Thanks for the info. This is a Moss item. Do not know what needle came with it. Anyone familiar with their offering?
    Thanks, Jim

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    Great Pumpkin DrEntropy's Avatar
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    Re: MGB and HIF44 SU Hesitation

    Another thought: what oil are you using in the damper?

    ... and check the needle for starters.
    '64 MGB, '67 Lotus Elan S-3 DHC,'69 Lotus Elan +2
    '78 Alfa Romeo Spider-current Daily: O=\*/=O
    '84 300D Turbo-"Diesela"-SWMBO's Daily: OO|≣|OO
    '66 Alfa Romeo GT - Upscale Yard Art: Oo=\*/=oO
    Chaos & Mayhem PTY, LTD..C.I.O. & Floor Sweepervisor

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    Re: MGB and HIF44 SU Hesitation

    I'm using Castrol 20W-50 in the damper. 'She' runs well (very) with the choke out partially. I adjusted the idle screw (on the choke linkage)to maintain correct idle speed. Should I be able to read the needle ID by withdrawing the piston with the piston intact, or will I need to remove he needle? (That may be and ""idle"" question, since I will pursue the needle ID whatever is required...) Thanks, Jim~

  7. #7

    Re: MGB and HIF44 SU Hesitation

    Quote Originally Posted by rick_ingram
    I used a BBQ needle...
    Is that like a spit as used on an outdoor grill?
    D

  8. #8

    Re: MGB and HIF44 SU Hesitation

    Quote Originally Posted by Dave Russell
    Quote Originally Posted by rick_ingram
    I used a BBQ needle...
    Is that like a spit as used on an outdoor grill?
    D
    Well...it's too large for a Spitfire...and doubt if it would be very useful in a Weber.

    [img]/bcforum/images/%%GRAEMLIN_URL%%/cheers.gif[/img]
    Rick Ingram
    1978 MGB - 1969 MGC - 1974.5 MGB/GT V8 conversion - 1968 MGC - 1972 MGB

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    Great Pumpkin DrEntropy's Avatar
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    Re: MGB and HIF44 SU Hesitation

    Quote Originally Posted by jdhorton
    I'm using Castrol 20W-50 in the damper. 'She' runs well (very) with the choke out partially. I adjusted the idle screw (on the choke linkage)to maintain correct idle speed. Should I be able to read the needle ID by withdrawing the piston with the piston intact, or will I need to remove he needle? (That may be and ""idle"" question, since I will pursue the needle ID whatever is required...) Thanks, Jim~
    Needle needs to be removed from the piston to read the "I.D." BUT!!! You just hinted that the choke plays into this. You MAY find that just enrichening the mixture will sort the problem. Locate the HIF mixture screw (a "shrouded" cross-hatch one, in a bore on the side) and run it in a quarter-turn. Drive the beast and note the changes.

    I can't recall if "in" (clockwise) or "out" (counter-clockwise) is the richer... I *think* the "in" is the enrichment. Hopefully a more post-emissions familiar member will pap up and define it more accurately.
    '64 MGB, '67 Lotus Elan S-3 DHC,'69 Lotus Elan +2
    '78 Alfa Romeo Spider-current Daily: O=\*/=O
    '84 300D Turbo-"Diesela"-SWMBO's Daily: OO|≣|OO
    '66 Alfa Romeo GT - Upscale Yard Art: Oo=\*/=oO
    Chaos & Mayhem PTY, LTD..C.I.O. & Floor Sweepervisor

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    Re: MGB and HIF44 SU Hesitation

    Many thanks to DrEntropy for the good advice on the enrichment adjustment on the HIF44. While it did take considerably more turns than anticipated, the "in" (clockwise) adjustment does, indeed, result in a richer mixture. The B is running very well and I am still making fine tuning decisions almost daily. Very pleased with the operation and response of the HIF44, and I'm glad that I decided to give it a chance.
    If anyone knows of an SU (or other) publication/manual containing (more) complete details of the HIF44, I will greatly appreciate the name of the pub(!). I'm sure that I should learn more about the setup and tuning as soon as possible.

    Thanks again for your help DrEntropy :O).

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