When Leaving Comments, please start with “Hi John”

Due to the considerable amount of unrelated comment posts we have been receiving ALL comments must be now include the words “Hi John” to be considered for moderation. Otherwise they will be deleted.

Note this is a personal blog and website, the view and opinions are of our own devising unless otherwise specified.

Errors and omissions excepted. (c) John Silvester 2018

9 thoughts on “When Leaving Comments, please start with “Hi John””

  1. Hi John! Just wanted to say a BIG thank you for helping me pass my driving test in the very first go. I didn’t think I could do it at 40, you gave me the confidence and training that was needed. I’m really enjoying driving alone : )) Thank you so much. You’re an excellent teacher.

  2. Hi John, was very interested by the article regarding water injection in diesels, something that I find very interesting. American websites seem to have plenty of anecdotal information but precious little hard data. I was tempted to bleed off boost pressure from the turbo to pressurise a water reservoir, though I am not sure that the spray would be very fine with just 1.7 bar or so of pressure. Another factor would be the slow pressure build up if the tank was perhaps 5 gallons and nearly empty, I envisage using small bore pipe and it maybe a problem with the time constants round the system, also the tank would take a while to depressurise following a period “on boost”, during which time water would still be flowing into the inlet tract. A solenoid valve before the water jet would be easy to implement…
    Currently I am sketching out an electronic control system taking inputs from existing sensors it should be reasonably easy to make the thing moderately progressive even if perfect tracking is not achieved…
    I still think a pressurised reservoir has merit even if I end up using an electric water pump, no problems with priming……
    Thank you for the thought provoking article, regards David

  3. Hi David. Thank you for your comment. The article is ‘Anecdotal’ in as far as I have not performed the experiments myself but I have no reason to doubt the data upon which I based my reasoning. I am certain that the Science is sound. Injecting water into the cylinders of a diesel engine at or near top dead centre requires a pressure of hundreds of bar and the engineering expertise required to develop a ‘proof of concept’ is far beyond my abilities. I hope that others with greater ability might read the article and run with the idea.

    John Silvester

  4. Hi Caroline. It was a pleasure teaching you. Thank you for your kind comment. May I wish you all the best in the future and I hope that you always enjoy your driving and become an expert driver.

    Kindest regards, John.

  5. Hi John,

    I just wanted to say thank you for all your help with my trailer test, particularly in being so reactive with my short time window.

    For those people reading this, I can highly recommend John as a B+E trailer instructor. He provides an excellent service, with a nice vehicle. He makes the process of preparing for the trailer test as straightforward as it can be. It’s obvious that he cares very much about his students and gives great advice.

    I passed first time!


  6. Thank you for that kind unsolicited comment on my service, Alastair. Thank you so much for passing first time. Have a successful time in Belgium.

    Kindest regards,


  7. Hi John,

    Looking to pass my test in February if possible. Have done some manoeuvring but not on-road driving yet. Would you have any availability?


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John Silvester on motoring and other musings