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Hot!Pinto Ping

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mrjdlewis
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2017/11/30 09:55:47 (permalink)
0

Pinto Ping

Hi All,
 
I have just picked up a mk1 with a pinto conversion and it seems to have a relatively consistent slight ping to it that is there when its cold or warm.
 
At idle its there a little bit, when i accelerate it might come and go, when im cruising around 3000 RPM at a constant speed though (like on a main road holding a constant speed) it disappears and then might come back ever so slightly.
 
Things i know about the car that i think may be contributing:
- there is a vacuum leak i suspect somewhere because when i stick my foot on the brake at the lights the rev's raise
- it has a brand new 32/36 carbie on it and im not sure what any of the jetting is
- i have checked the timing and all timing marks are lined up correctly (cam, dizzy, crank) and at idol (with the vacuum advance still connected) its sitting around 8' TDC.
- the temp seems to continue to slowly climb up over a period of about 30 mins where it gets to the point that it is almost at the red and i shut it down.
 
Suppose my questions are:
1) Does it sound like its being caused by running lean, potentially from the vacuum leak, potentially because of the unknown jetting.
2) Would the right approach be to block the booster vacuum connection on the manifold (booster / dodgy line is where i suspect the leak is), fire it up, confirm the timing is correct again and test to see if the ping is there (can replicate the ping by just holding revs slightly off idol)
3) What are the chances its an issue potentially with the vacuum advance on the distributor, is it worth blocking that too and setting the timing again and testing? Is that the best way to set the timing.
 
Any experience that can be shared with this kind of issue would be greatly apprecaited.
 
Thanks,
 
Josh
 
 
 
 
 
 
 
 
#1


11 Replies Related Threads

    mvscon
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    Re: Pinto Ping 2017/11/30 16:59:37 (permalink)
    +1 (1)
    Gday Josh
    Had the same overheating problem on my mk2.
    Have you tried a colder thermostat ( tridon tt4-180 ) it fixed my overheating.
    Mark
    #2
    mrjdlewis
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    Re: Pinto Ping 2017/11/30 21:45:51 (permalink)
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    Thanks Mark,
    Hopefully this weekend i can get a couple of hours to have a look. For the sake of $20 i might just replace it anyway so its one less thing to worry about. Thanks again!
    Josh
    #3

    mrjdlewis
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    Re: Pinto Ping 2017/12/02 17:29:04 (permalink)
    0
    Bit of an update:
     
    Blocked the brake booster off at the manifold. Issue is still there.
     
    I checked the Thermostat and its working okay, opens up fine and i can see the water pumping through once the car is warm
     
    I checked the spark plugs and they appear to be a coffee colour so i don't think its running lean.
     
    Also checked the jets and they seem to be in line with what people are running on a standard pinto for a 32/36.
    Main's
    140/140
    Air Correction
    145/160
    Idol
    60/50
    Idol Screw
    2.5 turns.
     
     
    #4
    PeterM
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    Re: Pinto Ping 2017/12/03 02:15:43 (permalink)
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    Whooligan has probably nailed it. 
    I have been continually warned by people employed in the petroleum industry that the quality of petrol is now very poor. Apparently Australia is a dumping ground for poor quality imported fuel.
    This time last year I had fuel related problems from using 91 octane fuel in a car I have owned since 2001.
    I now only use good quality 98 octane.
    Very questionable however impossible to prove if 91 octane is actually 91, and 98 octane is actually 98.
    Unfortunately we live in a commercial world where the profits of powerful multinational companies take precedence.
     
     
    #5
    mrjdlewis
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    Re: Pinto Ping 2017/12/03 15:53:40 (permalink)
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    Thanks for the ideas...i wasn't sure what fuel was in it (it was in there since i bought ti) so I drained the tank and got some fresh 98 but its still there.
     
    While i was under the car though i did notice that the exhaust about half way down the car has been squashed up against the under side of the body at some stage and its compressed the pipe to about 1/3 of its size.
     
    im now starting to wonder if its chocking on its own exhaust a little bit (or a lot!)
     
    #6
    Cholaso
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    Re: Pinto Ping 2018/03/04 16:30:49 (permalink)
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    Josh, is your compression ratio too high fir the fuel and perhaps try colder plugs. I had similar issue and part of it was that the machining done on the head created sharp edges which developed heat concentrations. Something to consider
    Rodney
    #7
    mrjlewis
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    Re: Pinto Ping 2018/06/14 17:27:33 (permalink)
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    Just thought i would close the loop on this one.
     
    Couple of things, the overheating was because there was no thermostat in there at all. I stuck in a tridon tt4-180 as recommended by @mvscon and its been working the treat. Turns out wasn't running lean etc.
     
    Also the ping noise. Managed to get it up in the air and get under the car and it sounded like the noise was coming from down low (inside the bellhousing).
     
    Whatever mechanism that pulls the starter gear back in was shagged and at a particular revs the harmonics must have just been enough for the starter motor pinion to work its way out and it was clipping the flywheel (the ping noise) and then pushing back.
    #8
    Timw
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    Re: Pinto Ping 2018/06/20 15:08:03 (permalink)
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    Engine ping is usually constant, usually happens during acceleration and is telling you that the ignition timing for the compression ratio and fuel octane and engine speed is incorrect. Is easy to determine on a dyno and usually can be eliminated, but not always as the fuel octane rating may not be available or financially viable even for a track car.
    It is the onset of pre-ignition or over advanced ignition in most cases and is not to be confused with actual mechanical noise from any source which have to be eliminated first.
     
     
    #9
    deano
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    Re: Pinto Ping 2020/07/17 19:07:15 (permalink)
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    Im ressurrecting this old thread, just to ask what octane fuel you guys normally use?
    I am planning to drain the old fuel in my 1600 crossflow, now that its back on the road.
     
    Currently it is pinging a bit when under load, but given that its sat idle for a few years, it's not too surprising and I expect the valves are probably sticking a bit.
    It has a 1600 GT mild cam, 32/36 weber, but the HC head remained fairly std from memory. I need to use lube additive, as it did not have hardened seats done back then.
     
    So with fresh fuel, like 98, what basic timing should I be looking for?
    Then take it somewhere for a decent tune?
    #10
    PeterM
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    Re: Pinto Ping 2020/07/18 17:41:52 (permalink)
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    Hi Deano,
    I have a 1600 van. Daily driver until two years ago. Mechanicals all standard.
    I use only 98, no additives.
    Timing is as factory specs.
    If the fuel is more than 1 year old best to drain it completely.
    Learn to tune it yourself.  5 minute job.
    :)
    #11
    BEEVEE
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    Re: Pinto Ping 2020/07/19 19:20:16 (permalink)
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    2/3 crush leaving you 1/3 gap in a crushed ex pipe will not be doing you any favours; correct it asap.
     
    For what it's worth. I've been using basic 91 octane in ALL my 12 cars from our 2001 T.Prado as recommended by TMC, down to my 1957 Holden FE, with 2 Falcon 351 V8's and many others, in between for the last 20 years at least.  Always had full power and no issues, except for the fact that since we don't get LEAD anymore since 1986? I have noticed  fuel tanks are more prone to rust, as some of you may have read re my need for a new tank for my 1978 XC Coupe 5.8 that I purchased Brand New. Even when we had the now obsolete SUPER (with lead), I always added UCL +-(Redex, Castrollo, SOO) in EVERY tankful, to lube the whole system, and still do.
    As a kid, I took this advice from experts far more knowledgeable than me, and it must have been good advice as I still have all the cars I purchased since turning 16 to date, and NOT ONE has had ANY engine issues or damage, or the need for head removal, or special seats/valves fitted for ULP......................go figure.
     
    IF WE ALL FOLLOW PANDEMIC PREVENTION ADVICE TO THE LETTER, WE MIGHT ENJOY OUR NORMALITY AND OUR CARS AGAIN SOONER RATHER THAN LATER ?
    post edited by BEEVEE - 2020/07/19 19:23:20

    "GOOD BETTER BEST: NEVER LET IT REST: UNTIL YOUR GOOD IS BETTER, AND YOUR BETTER, BEST"
    ( Furphy WW1 HORSE-DRAWN water-tank end-plates)
    #12
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