VW 1800 AW code engine cylinder head cracked need help.

Discussion in 'Mech Tech' started by shahaviation, Sep 18, 2015.

  1. Baysearcher

    Baysearcher [secret moderator]

    Exactly what I thought.
     
  2. What I don't get is when new a AP engine is 68 BHP yet this has been RR at over 90 .... There are a lot of Wild BHP engine figures floating around ... Is it the RR out of calibration or what !
     
  3. 77 Westy

    77 Westy Supporter

    This exactly ^. I’ve mentioned it a couple of times but the OP doesn’t want to (or cant) clarify what it is. It’s possibly a typo and the BHP is 49 not 94, that would tie in more or less with the low cylinder pressures. But almost all of the data given about this engine defies logic.
     
  4. Have you thought about getting it on a RR to see what is coming out of the tail pipe?
     
  5. 77 Westy

    77 Westy Supporter

    Post #60 ‘Had rolling road tune done and produces 94BHP’
     
  6. So stock(ish) 1800 build. What carbs do you have on there? And what adjustments did the RR guy do to the carbs?
     
  7. Zed

    Zed Gradually getting grumpier

    Ict's. It's worth a skim back over this interesting thread, it's been one thing after another.
     
  8. I did skim... just not well enough :lol:
     
    77 Westy and Zed like this.
  9. I'd still like to know what alterations the RR guy did, and did he give you an emissions chart vs engine rpm?

    That HC level is way high... should be in the 250 to 500 range... is she using oil?
     
  10. https://www.dropbox.com/sh/9wv654onh8e0o61/AAD3L_28uJW2b6eg20JXkgz8a?dl=0
    Hi guys. Sorry but been away on business and just returned. I have put a link to dropbox above showing the pics sent to heritage. One is the rolling road bhp pic I took and no print out was given and only adjustments were to blank off both the carbs at the vacume take off connecting to a pipe that connects to the brake servo as leak was detected and then he adjusted the carbs and timing which he said was not far off But he did say the hydrocarbon was high And get tappets checked + compresion .
    I then reconnected the servo pipe which I found not attached under the van and the blanked off vacume connections to the carbs. Checked for leaks and now ok. Back to the garage who redjusted the tappets and printed out the results as shown earlier.
    Have niw driven the van 700 miles on this engine and does not use oil so ok there.
    Hopefully this answers @Paul weedings questions.
    Van drives great and pulls ok on hills but high temp as stated earlier hence deciding to do roadtrip to wales next two weeks and stopping if temp goes above 120C to cool down.
    The saga continues and determined to sort out as too deep into this and lot lighter pocket.
     
  11. Last Q.

    Have you checked the temp gauge with a pan of boiling water??

    VDO gauges are notoriously bad for being a good bit out of spec
     
  12. mikedjames

    mikedjames Supporter

    The other reason is that there are several differently calibrated senders and gauges sold by VDO and these can be mixed up producing inaccurate readings even if both the gauge and sender are accurate...

    Anyway I drove a T1 engine around at an accurately indicated 122 degrees C max for about 40000 miles so the idea of letting off the pressure when it is getting hotter should be OK. but avoi stopping a hot engine as it takes longer to cool at 0 rpm than driving it at 30 mph...and heat soak hitting the carbs boiling the fuel and making a cooldown into a (temporary) breakdown is another reason to keep the cooling air moving.

    If it has done 700 miles already without issue , go on holiday.

    You might find checking the high RPM timing and backing that down to nearer 28 than 32 degrees may also help the engine run cooler.
     
  13. I,ll check the vdo temp reading with boiling water tomorow to confirm calibration of the readings and will slow down and avoid extended motorway runs And many thanks guys.
     
    Paul Weeding likes this.
  14. Well today i did the boiling water test of the dipstick sender and gauge reads 100c. So confirms it is accurate.
     
    Paul Weeding likes this.
  15. Well completed my roadtrip with no probs. Luton , Gloucester, Cardif, Solva in Pembrokeshire, on to Breckon with big hills. 125C on long motorways at 55MPH, Max 120C on short A & B roads, 130C up long steep hills . Power ok . Oil ok with no top ups after 600 miles. Slight backfireing when off throttle downhills in gear but ok when hotter for the last 200 miles of the trip and average around 20 MPG.
    Guess back to garage for checking timing and carb set up.
     
  16. Zed

    Zed Gradually getting grumpier

    You do know that's much too hot for those speeds? Did we mention that? If it were mine I'd be finding out why while I still had an engine.
     
  17. I'm trying to find the reason for hot running but short of engine out and having it stripped and checked out I'm running out of options. will speak to Heritage again to get them to agree to an indipendent review as don't want the extra expense of stripping engine to as delivered and heritege then not covering warranty repair if faulty valves on heads as I now suspect is the cause. They will simply say that overheating is the cause even though the probs exist since fitting their new engine having just the lowest acceptable 115 psi across all cylinders which I am finding strange.
     
  18. Zed

    Zed Gradually getting grumpier

    Sorry I have to be reminded of the back story. :oops: I remember now.
     
    Flakey likes this.
  19. Can you get access to one of those laser gun type temp readers ....I would make 100% sure it is actually over heating ..mine ranges 90-115
     
  20. No access to laser temp reader. Will check with my mechanic if they have one at the garage.
     

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