1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.
  2. Welcome To LandyZone!

    LandyZone is the biggest Land Rover forum on the net. We have plenty of very knowledgable members so if you have any questions about your Land Rover or just want to connect with other Landy owners, you're in the right place.

    Registering is free and easy just click here, we hope to see you on the forums soon!

Engine bogs down and stalls when warm

Discussion in 'It's A V8 Mate!!' started by paulcottam, Feb 7, 2021.

< Previous Thread | Next Thread >
  1. paulcottam

    paulcottam New Member

    Joined:
    Jul 8, 2004
    Posts:
    8
    Likes Received:
    0
    Location:
    Chesterfield
    I have a rover V8 3.5 ltr fitted with solex CD175 carbs I had no previous knowledge of the engine and bought it some years ago as a runner

    I put it into my lightweight and did a compression test to make sure the engine is ok before taking further everything was fine with this test

    The engine starts and runs easily on choke and there are no bad sounds in fact it runs well with good oils pressure etc but once the engine warms up it’s starts to struggle and if you apply throttle it bogs down and stalls out and is difficult to start until cold

    Thing I have done so far to sort this are
    Changed to electronic ignition and matched coil dizzy cap rotor arm and plugs etc .
    Fitted facet low pressure electronic fuel pump and filter the one specified for the V8 and fitted return to tank pipe .
    I have stripped down the carbs to float chambers and cleaned out checked diaphragms and choke mechanism etc.
    Checked the coolant outlet on the carb tower to make sure water is flowing through to avoid fuel evaporation .
    I have fitted a ht spark indicator and see through fuel filter so I can see there is a good spark and fuel supply as I run the engine there is a good spark and fuel supply in the filter .

    The engine still has the same symptoms it feels like a fuel issue but for the life of me I cannot think of where to go now
    The pipes that come out of the rear inlet manifold are connected together in a u shape return pipe as this is a competition vehicle there is no heater

    I am at a loss what else to do with it now any suggestions appreciated
     
  2. Shippers

    Shippers Well-Known Member

    Joined:
    Mar 7, 2017
    Posts:
    7,407
    Likes Received:
    5,229
    Location:
    Algarve
    When it stalls have you whipped a plug out and had a look it may be flooding...just a thought...
     
  3. paulcottam

    paulcottam New Member

    Joined:
    Jul 8, 2004
    Posts:
    8
    Likes Received:
    0
    Location:
    Chesterfield
    Yea I take a plug out and it's dry not wet plugs are sooty but I assumed that's because it's never really gets off choke
     
  4. Shippers

    Shippers Well-Known Member

    Joined:
    Mar 7, 2017
    Posts:
    7,407
    Likes Received:
    5,229
    Location:
    Algarve
    Was there a ballast resistor fitted prior to dizzy change I had to remove one as coil for electronic is different rating...
     
  5. paulcottam

    paulcottam New Member

    Joined:
    Jul 8, 2004
    Posts:
    8
    Likes Received:
    0
    Location:
    Chesterfield
  6. Shippers

    Shippers Well-Known Member

    Joined:
    Mar 7, 2017
    Posts:
    7,407
    Likes Received:
    5,229
    Location:
    Algarve
    Ahh ok...
     
  7. Stanleysteamer

    Stanleysteamer Well-Known Member Full Member

    Joined:
    Nov 22, 2013
    Posts:
    17,356
    Likes Received:
    24,548
    Location:
    East Dorset
  8. Henry_b

    Henry_b ̿̿ ̿ ̿'̿'\̵͇̿̿\з= ( ▀ ͜͞ʖ▀) =ε/̵͇̿̿/’̿’̿ ̿ ̿̿

    Joined:
    Jan 29, 2018
    Posts:
    13,329
    Likes Received:
    13,134
    Location:
    Its Full of WIN.....
    I'd start with he basic settings of the carbs, first. Is the needle fitted correctly, is the jet height set properly, is the float height correct, dash pot etc etc.

    Have the carbs been apart?
     
    Stanleysteamer likes this.
  9. paulcottam

    paulcottam New Member

    Joined:
    Jul 8, 2004
    Posts:
    8
    Likes Received:
    0
    Location:
    Chesterfield
    Only to clean out float chamber and to check diaphragms because of this issue i have put another set of the same type carbs on from an old battered trialer and it runs ok with these so must be something to do with the carbs will have to find a guide and have a go at setting them up properly
     
  10. Stanleysteamer

    Stanleysteamer Well-Known Member Full Member

    Joined:
    Nov 22, 2013
    Posts:
    17,356
    Likes Received:
    24,548
    Location:
    East Dorset
    In that case it looks as if you just have to copy everything off the other carbs, i.e.jet sizes, needle profiles, mounting positions of both jets and needles etc.
    Sounds to me like the carb is running rich so maybe the jets are too big. I don't know enough about Solex/Strombergs as they are not my favourites but the numbers of the jets may be marked on them somewhere. Failing that, there may be a way, with a thin but conical needle, like one out of an SU, to measure the sizes.
    Could waffle on about this for ages, but also, quite simply, have the jets got worn?
     
  11. classic kev

    classic kev Well-Known Member

    Joined:
    Jun 23, 2008
    Posts:
    3,453
    Likes Received:
    97
    Location:
    on the side of a hill near Nannerch, N.Wales
    +1 for carb jetting. Also, look at carb balance. The only other thought is maybe try advancing the ignition timing and see if that helps.
     
  12. jamesmartin

    jamesmartin Well-Known Member

    Joined:
    Dec 8, 2010
    Posts:
    91,399
    Likes Received:
    19,770
    Location:
    louth lincs
    sounds like its still choked
     
  13. v8250

    v8250 Well-Known Member

    Joined:
    Jun 23, 2019
    Posts:
    1,961
    Likes Received:
    2,080
    Location:
    Berkshire
    As the other guys have said above, this is most likely a carb issue...but

    1. have you checked peak fuel flow rate and pressure of the Facet? they're great pumps but do need to be carefully match spec'd to the application, it's no good throwing in a Blue Top Fast Road jobbie when a Silver Top is required. For the Rover 3.5 V8 it's normally best for a Red Top and balancing fuel flow/pressure with a Filter King regulator.
    2. A proper rebuild of the carbs is always the best route
    3. You could have fuel line blockage so with carbs and fuel pump out, clear the fuel lines
    4. The SimonBBC ignition kits are very good but that kit's for a 4cyl engine, not an 8cyl engine o_O have a chat with SiminBBC to see if the kit can be used for both, they're tech support is very good.
    5. check mechanical timing off cyl #1 tdc [front right bank] - the RV8's are very forgiving on timing but should be set up using a strobe with dwell setting + be sure the ign leads are in the right order, it's really easy to swap one or two over.

    ps the RV8 needs two additional inline fuel filters, 1. before the pump, and 2. before the carbs. Ignore the crappy filter inside the pump. A Filter King with glass bowl filter and regulator point is always ideal for any RV8
     
< Previous Thread | Next Thread >