LD32 Engine build | Page 10 | The Z Club of Great Britain
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LD32 Engine build

Discussion in 'Hybrid Z cars' started by jonbills, Apr 5, 2020.

  1. Rob Gaskin

    Rob Gaskin Treasurer Staff Member Moderator

    I can so understand that Jon but hey it works so you have an extra day of knowing it works. Well at tickover at least.

    I really want this engine to run well but don't push your luck with the revs.
    A 3.2 litre L6 should be plenty powerful for an S30 at up to 6k in my mind.
     
    AliK likes this.
  2. jonbills

    jonbills
    ZClub Administrator
    Moderator

    You're right Rob, I won't rev this one beyond 8k.
     
    datsfun, Huw, AliK and 2 others like this.
  3. franky

    franky Well-Known Forum User

    8400rpm was the limit on my s50b32. That was a motor that’d 150k miles.
     
    jonbills likes this.
  4. johnymd

    johnymd
    Z Club Member

    Great work Jon. So what is the engine dimensions now? Bore, stroke, head cc, ect.
     
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  5. jonbills

    jonbills
    ZClub Administrator
    Moderator

    Thanks John.
    It's 89.5 x 84.27 which I reckon makes 3,180cc.
    The chambers are 39cc, so with the piston cut outs, I think the CR is 11.7:1
    standard 44/35 valves and same old .585 lift, 308/309 duration cam
     
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  6. Rob Gaskin

    Rob Gaskin Treasurer Staff Member Moderator

    Ok. Don't get me wrong I love revs and used 7k all the time in my track car, it took it well.
    Completely different 'animal' and not engineered and built by a man in a shed.

    Don't get me wrong I love revs but I don't want Jon's engine to go 'pop' again. Get some miles on it Jon.
     
    AliK likes this.
  7. AliK

    AliK
    Z Club Member
    Staff Member Moderator

    WELL DONE JB!!! You must be very very chuffed with yourself! I agree with Rob, you need a see through bonnet!! ;)
     
    jonbills likes this.
  8. franky

    franky Well-Known Forum User

    JB Weld?
     
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  9. Huw

    Huw
    Z Club Member

    Great work Jon, looking forward to see it run!
     
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  10. johnymd

    johnymd
    Z Club Member

    If it’s built with a Rev limit in mind then use the revs. Not sure I’d want to push past 8k although I’m sure it would be loverly to hear.
     
  11. jonbills

    jonbills
    ZClub Administrator
    Moderator

    Well, it's the same head/valve train that was on the previous engine, and proved itself not safe at 8,700 rpm, but was good below that, so that won't have changed.
    The bottom end is lightened and balanced so should be good to rev, although the extra stroke compared to the previous engine I suppose means higher piston speeds. So, all in all, 8k sounds like a good limit.
     
  12. Rob Gaskin

    Rob Gaskin Treasurer Staff Member Moderator

    8k - have you got a 4.4 diff;):confused:
     
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  13. jonbills

    jonbills
    ZClub Administrator
    Moderator

    3.7, but I'd take a 4.4 if you've got one :)
    8k isn't about theoretical top speed for me, it's about producing power. Unlike a standard engine, there's more power available at 8k than 6k, so why wouldn't I go there?
     
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  14. Rob Gaskin

    Rob Gaskin Treasurer Staff Member Moderator

    8k in top would be good at the Bonneville Salt Flats. ;)

    Only teasing you Jon, I really admire your 'have a go' attitude and what you achieve.

    I just want you to be gentle with your engine at first to get some reward before you push the boundaries.

    Good Luck.
     
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  15. jonbills

    jonbills
    ZClub Administrator
    Moderator

    I had a mini disaster yesterday, the fan hit the radiator and made a mess, and I lost all the coolant. No idea how long I was running like that - I was paying attention to the fuelling and not the temperature. :(
    I think this was another consequence of lowering the engine 20mm - the viscous fan now overlaps the rad bottom tank, making contact possible.
    I had done 650 miles before it happened, so I'm still a little confused why it didn't happen sooner.


    DSC_0003.JPG

    I was about 5 miles from home, and as luck would have it, a nice chap who builds classic touring cars was passing with his trailer empty, so quickly loaded it up and dropped me home.
    I've tested it today with my old standard rad, and there's no harm done to the engine, which is a relief. New 4 row radiator should be delivered tomorrow.
    I've cropped the leading corner of the fan blades too, so hopefully there'll be no further contact. I suppose the fan will be less efficient at cooling like this, but hopefully the extra capacity of the diesel water pump will make up for it to an extent.


    DSC_0004 (2).JPG
     
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  16. AliK

    AliK
    Z Club Member
    Staff Member Moderator

    Wow JB! You got luck to have avoided proper damage. How were the first 650 miles? How does she feel?
     
  17. jonbills

    jonbills
    ZClub Administrator
    Moderator

    I'm certainly very relieved it wasn't worse. It felt quick for a few days, and now it doesn't feel different from how I remember the old engine. I think that's a fairly normal experience - we really quickly get used to 'more'.
     
    AliK likes this.
  18. Mark N

    Mark N
    Z Club Member

    Glad to hear there wasn't any serious damage after all your work.
    Loving the ratchet straps BTW. :)
     
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  19. jonbills

    jonbills
    ZClub Administrator
    Moderator

    Thanks Mark. I really ought to use chains, 'cos POWAH
     
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  20. AliK

    AliK
    Z Club Member
    Staff Member Moderator

    I have to say, I felt the same about my new engine, especially during the running in period when I was constantly out in it. Then after a winter layup, you get into it and it makes you grin large!

    Which rad are you getting? An eBay aluminium one perchance?

    I wonder if the engine mounts have more longitudinal movement than anticipated? Come on, how hard were you braking :p
     

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