2000 Block vs 2001 Block - Knock Sensor
6 Attachment(s)
I am pulling my 1999 block with large
threaded knock sensor and going to install a 2001 block with smaller threaded sensor. Knock sensor 19xx to 2000 Blocks Uses a 1 wire with a large thread in bolt around 1/2" to 5/8" 2001 forward Blocks uses a 2 wire with a smaller threaded bolt 1/4" I have read... 1. Can Drill & Tap smaller hole to fit 1 wire larger sensor. 2. Can Use Blue wire and ground Gray one on the sensor. 3. Use a reducer - large female size to male 1/4 and thread into 2001 block 1/4" small hole. Pics I have found attached with my notes. Thanks for any input on this, I know I am not going to let a damn 1/4 hole size change stop me from getting that 2001 block in my 1999 Blazer. Bill |
Anyone ??
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I'd go with option 1. Drill and tap the hole and keep everything 1999. Option 2 is easier if you're sure it will work. Option 3 I wouldn't do because I'm too fussy. The piezoelectric crystal in the knock sensor produces electricity when shaken. Raising it's mounting point even that little bit may create a pendulum effect where it's moving farther than it would in the stock location. I don't know if they are that sensitive, but I know my luck when I try to take the easiest way.
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Originally Posted by Rusty Nuts
(Post 672967)
I'd go with option 1. Drill and tap the hole and keep everything 1999. Option 2 is easier if you're sure it will work. Option 3 I wouldn't do because I'm too fussy. The piezoelectric crystal in the knock sensor produces electricity when shaken. Raising it's mounting point even that little bit may create a pendulum effect where it's moving farther than it would in the stock location. I don't know if they are that sensitive, but I know my luck when I try to take the easiest way.
If option 2 didn't work it would be a mission impossible to drill tap after motor was back in. |
FYI
1 wire sensor is 1/4" NPT thread 2 wire sensor is supposed to be 5/16-18 thread Option 2 will not work - don't do it - check the wiring schematic. Drill and tap the hole in the 2001 block to 1/4 NPT if you can, and screw in the 1 wire sensor. It doesn't have to seal - just be solid. I have also recently heard of screwing the 1-wire sensor into the 1/4 NPT coolant hole in the side of the head and extending the wiring to that location. |
Originally Posted by Lesmyer
(Post 672971)
FYI
1 wire sensor is 1/4" NPT thread 2 wire sensor is supposed to be 5/16-18 thread Drill and tap the hole in the 2001 block to 1/4 NPT if you can, and screw in the 1 wire sensor. I have also recently heard of screwing the 1-wire sensor into the 1/4 NPT coolant hole in the side of the head and extending the wiring to that location. Did you mean drill tap 2001 block which is 1/4 already to 5/16-18 thread for larger knock sensor size bolt ??? And - ?? - The 1 wire sensor 5/16 size.. would not fit in coolant hole if coolant hole is only 1/4 ? From pictures I have seen the (1999) 1 wire sensor looks like a big boy around 7/8 or 1/2, hope to find out tomorrow when my guy pulls it out of 99 block. |
Originally Posted by cdtek101
(Post 672976)
Confused Les - Did you get sizes backwards ?
Did you mean drill tap 2001 block which is 1/4 already to 5/16-18 thread for larger knock sensor size bolt ??? And - ?? - The 1 wire sensor 5/16 size.. would not fit in coolant hole if coolant hole is only 1/4 ? From pictures I have seen the (1999) 1 wire sensor looks like a big boy around 7/8 or 1/2, hope to find out tomorrow when my guy pulls it out of 99 block. 1/4" NPT (national pipe - taper) is considerably larger than a 1/4-20 or other similar straight thread since it is formed into the outside of a 1/4" pipe having a nominal outside diameter of 0.405". |
1/4 NPT is larger than 5/16-18. 1/4 NPT is the size of the threads on a the 1-wire knock sensor used in 1999.
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Originally Posted by Lesmyer
(Post 672979)
1/4 NPT is larger than 5/16-18. 1/4 NPT is the size of the threads on a the 1-wire knock sensor used in 1999.
Originally Posted by swartlkk
(Post 672978)
1/4" NPT (national pipe - taper) is considerably larger than a 1/4-20 or other similar straight thread since it is formed into the outside of a 1/4" pipe having a nominal outside diameter of 0.405".
I was just going off standard bolt sizes, was wondering what NPT stood for. |
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