Piston detonation evidence - 1998 Northstar - Page 3
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Northstar Engines and System Technical Discussion Discussion, Piston detonation evidence - 1998 Northstar in Cadillac Engine Technical Discussion; What I dont get submariner is I would never think I had more knowledge than you on anything related to ...
  1. #31
    SC2150's Avatar
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    Re: Piston detonation evidence - 1998 Northstar

    What I dont get submariner is I would never think I had more knowledge than you on anything related to the operation or maintanance of a submarine, or even what it is like to live for an extended period on one, but this area I put my experiance and qualifications up with any builders in the country, and have been doing this for over 38 years and do keep up on all new technology as we are one of the most respected perfomance shops in the SE US, and I do this daily with all these different engines, yet you always attack and are beligerent in the few areas where you are not the expert (even though you are 99% of the time right on and a huge asset to this forum). Why cant you accept there are some areas where us that do this day in and day out for a living may have a bit more expertise in these areas? I dont make a dime sharing information that has taken a lifetime to gather....and it takes time to contribute to those looking for guidance that is correct.

    I want no quarrel with you yet you throw in the jabs and insults far to often....what is the purpose of this? Just a bug up your but that somehow encourages this? How does this benefit the mebers looking for correct advice? Never do I come into a thread you have given accurate advice in and challenge you, but you seem to make it a priority to do this in my case.

    This is not a contest.....this is simply sharing information and for some reason you have the wrong impression that I am not who I am it appears. What is it you want to stop this?

  2. #32
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    Re: Piston detonation evidence - 1998 Northstar

    I want world peace.
    This is starting to look like the quarrel between Tim Carroll and Jake over at Northstar Performance. I appreciate all info, good or bad. If I go with bad then I have no one to blame but myself, because Google is MY friend.

    All that I need is suggestions, there is no need for headbutting.

    Maybe there should be another category added on somewhere for members to rant at each other, but then again other members would throw their 2 cents in when they had no business being involved, and then it gets real ugly. I guess that wouldn't work either. Forget that idea.

    Anyway I went out and got more sand paper, 320, 400, 600, 800, 1000, and I already have 1200 and 2000.
    Lets see what happens.

    Thank you ALL

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    daveyhouse is offline Cadillac Owners Fanatic
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    Re: Piston detonation evidence - 1998 Northstar

    Okay here we are with 320 grit and sore fingers later, almost got it all.
    I should have separated the rod and weighed it first just to see how much I removed.


  4. #34
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    Re: Piston detonation evidence - 1998 Northstar

    That is excelent. I would have no worries now.

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    Re: Piston detonation evidence - 1998 Northstar

    No tend to agree with Sub - no big deal if you had left it - no harm done by lightly sanding. Interesting that the crown did not show the factory machining marks. I used an air die grinder and a steel wire brush attachment to remove carbon on my piston crowns (and combustion chambers/valves). I guess maybe the wire brush could have been a little dull, but it did not seem to cut into aluminum at all and very fine concentric or spiral machining marks were clearly left remaining visible on the top of the pistons - I don't see that in your pictures.

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    Re: Piston detonation evidence - 1998 Northstar

    There are swirls. I finger sanded in a circular motion. I guess the phone camera only picked certain angled marks from shadowing something. I dunno. LOL

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    Re: Piston detonation evidence - 1998 Northstar

    Now you've done it. Shortened the piston and lowered the compression ratio in that cylinder.

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    Re: Piston detonation evidence - 1998 Northstar

    Less chance of detonation

    Seriously though the piston is now uneven on top because chasing the pits, as mention before a lathe would have been the ticket.

    Do you think the uneven top will have a dramatic effect on anything? I had to chase quite a bit.

  9. #39
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    Re: Piston detonation evidence - 1998 Northstar

    BTSOM My guess would be no.

  10. #40
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    Re: Piston detonation evidence - 1998 Northstar

    No...you will be fine. This is not a 1000 hp FI build. Just the jagged edges of erosion like that would be where any future detonation would attack.

    I would have no qualms installing it as you have it dressed.

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    Re: Piston detonation evidence - 1998 Northstar

    As you can see just above the intake valve relief on the lower right, the dark shadowing from where I was chasing the worse pit. I will try to measure how deep it is when I get a chance today.


  12. #42
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    Re: Piston detonation evidence - 1998 Northstar

    No worries. It wont affect the CR enough to notice anything. Turned on a lathe would.

    RX Performance Products/RevXtreme.com 941-721-1826

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    Re: Piston detonation evidence - 1998 Northstar

    Okay deepest spot is .018

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    Re: Piston detonation evidence - 1998 Northstar

    I'm glad you said something SC2150. I have not posted for months because of Subs way of doing things, but i pray for him and feel sorry for him, because hurting people try to hurt others.

  15. #45
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    Re: Piston detonation evidence - 1998 Northstar

    He is usually dead on with most advice so he is a huge asset to the forum so I dont interfere in his threads. Just want peace and all good advice to the members as many of us cant be on very often. Thx for the support Tom's.

    davey, you will be fine like that...good job and good luck with the rebuild. Lots of good info here.

    RX Performance Products/RevXtreme.com 941-721-1826

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