Running these cars on unleaded petrol | The Z Club of Great Britain
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Running these cars on unleaded petrol

Discussion in 'S30 (240Z,260Z,280Z) General' started by Josh Slade, Apr 17, 2019.

  1. Josh Slade

    Josh Slade New Forum User

    Hi there, i'm very new to these cars and going to be purchasing one very soon, are these engines fine to run on UK unleaded petrol?

    Thanks
     
  2. jonbills

    jonbills
    ZClub Administrator
    Staff Member Moderator

    I think valve seats before '77 were bronze and so not safe with unleaded.
    However, many have had their seats replaced so....
     
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  3. Rob Gaskin

    Rob Gaskin Treasurer in training Staff Member Moderator

    As far as I know it's a lot earlier than that Jon. Only very early 240s shouldn't be run on unleaded. I'll search.

    Edit. It's a minefield on here - not looked anywhere else. The consensus is that you won't have a problem with unleaded.
     
    Last edited: Apr 18, 2019
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  4. Josh Slade

    Josh Slade New Forum User

    Thanks for the help!
     
  5. jonbills

    jonbills
    ZClub Administrator
    Staff Member Moderator

    My search showed the clubs technical advisor confirmed valve seats were bronze until '77 at least on the UK cars.
    If you run bronze seats with unleaded you will get accelerated wear. They aren't designed for unleaded. If you only do 300 miles a year, it'll be a good few years before you have a problem. That may be fine for you.
    I ran a head with bronze seats for a few years and even with lead replacement additive the seats were visibly eroded after a few years.
     
    Last edited: Apr 19, 2019
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  6. MaximG

    MaximG
    Z Club Member

    This was fairly comprehensive from MrF a few yeas back.

    Unleaded
     
  7. johnymd

    johnymd
    Z Club Member

    So it’s all still inconclusive. Most of the 240’s I’ve bought over from the US appear to have engine that have not been apart. The silver ratty car that gets the most use has an untouched engine so I have often considered if I’m likely to cause damage with straight unleaded.
     
  8. slaphead

    slaphead
    Z Club Member

    Do we know what engine number was 1st fitted with non bronze seats ie. the cut off?
     
  9. jonbills

    jonbills
    ZClub Administrator
    Staff Member Moderator

    I didn't find that detail I'm afraid.
     
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