GM knock sensor thread Options

[lagos]

is that an ATS TB inlet? looks nice. i ordered one last week!

Yup, I ordered that and the GM Knock Sensor Conversion for Doc to install. Along with the healthy dose of goodies that he's putting in the car.......should be really niiiiiiice.

i woudlnt recomend using the GM knock sensor. it dosnt work correctly for our cars and ats should stop selling it imho. keep the stock sensor.

[jgreening]

That is one post in the thread. And if I were willing to ignor Ricky B and the testing by 510Rob, it might be enough for me to say maybe getting a knock sensor for a different frequency would be a suitable alternative.

As for your question, if stroke does not matter to knock frequency, piston position should not matter either. Even if it did, knock is pre-ignition due to the charge occuring due to compression. I would assume (I dont know this for sure) but that the piston position of detonation is within a relatively small range since that compression will occur as the piston travels toward TDC.

I know both you and Manny may have been offended by the statements "its your motor" and "see how much you save if you have to replace a blown motor" but I was not. These statements are designed to make you think if you are being penny wise and dollar foolish.

One thing to remember, we all made mistakes in our build. Why? Because during the process of the build (and afterward), we learned things that would cause us to do it differently if we did it again. I actually started a thread awhile back about things I would do differently if I were swapping today rather than two years ago for people who are in your exact position. Bottom line: its not a bad thing to have your plans critiqued by others who have been there and then change courses. We cannot possibly know all of this stuff before going through it. I wish you the best of luck.

[Fastbird]

That is one post in the thread. And if I were willing to ignor Ricky B and the testing by 510Rob, it might be enough for me to say maybe getting a knock sensor for a different frequency would be a suitable alternative.

As for your question, if stroke does not matter to knock frequency, piston position should not matter either. Even if it did, knock is pre-ignition due to the charge occuring due to compression. I would assume (I dont know this for sure) but that the piston position of detonation is within a relatively small range since that compression will occur as the piston travels toward TDC.

I know both you and Manny may have been offended by the statements "its your motor" and "see how much you save if you have to replace a blown motor" but I was not. These statements are designed to make you think if you are being penny wise and dollar foolish.

One thing to remember, we all made mistakes in our build. Why? Because during the process of the build (and afterward), we learned things that would cause us to do it differently if we did it again. I actually started a thread awhile back about things I would do differently if I were swapping today rather than two years ago for people who are in your exact position. Bottom line: its not a bad thing to have your plans critiqued by others who have been there and then change courses. We cannot possibly know all of this stuff before going through it. I wish you the best of luck.

Good words man. I'll clear up that I wasn't offended by the statements, just getting sick of them.

As for piston position in the cylinder, taking an LT1 as example, that's a stock 3.48" stroke. That's 3.48" where the piston could be located anywhere in that cylinder. If you're talking about a 4.00 bore, then you're looking at a volume change of approximately 43.75 cubic inches or .7125L on that cylinder between TDC and BDC. If there is a condition that's severe enough, you could possibly even detonate prior to the intake valve closing before the compression stroke has even begun (ever see a V8 with a couple of swapped plug wires). Given that, I feel that there's going to be a marked frequency change in the knock between the two points (TDC and BDC) with the volume change. I know it's not a 3S-GTE but the same theories still apply as a motor is a motor for the most part.