cspetros
Well-known member
I don't ask many questions, but I've come across something that I need some advice on. I've read the threads that discuss the block/knock sensor boss issue, but they are mostly "N/A block v. Turbo block differences" threads, and do not go into sufficient detail. Here goes:
I've gathered all parts needed for a N/A engine build for my '92 G-GS. I have discovered something that has halted progress for the moment, however.
The ECU in my G-GS came with a knock board installed (Yes, it's strange. This fact was discussed in ThIs thread.). The original block from the GS had a raised, tapped spot in which a knock sensor was installed:
The problem is that the block I am using for the engine build (not the original block) does not have this raised area:
(Actual picture of block; the area for the K.S. is not raised, with an unthreaded, shallow hole [instead of raised, and threaded])
I am asking for advice on what to do about this. Being that the engine is N/A, a knock sensor isn't 1st priority; on the other hand, if I leave the sensor unplugged, the ECU will revert to a set knocksum, and retard timing by default (I do not need an even slower car /ubbthreads/images/graemlins/grin.gif). I would rather not buy another ECU (this one has been recapped, and works great), and I would like to use this block, as I have already prepared it (cleaned, painted, freeze-plugs). I am not using the original block due to huge amounts of cylinder wear. The pictured block I am using is the original block from my N/A '90 G-GSX, and is in great condition.
Maybe it's possible to drill the block, even without the raised area? It does have a hole there, but I think drilling too much might puncture the water jacket. Or, maybe it's possible to "fool" the ECU somehow?
I would appreciate any suggestions/advice. Let me know if you need any more information.
I've gathered all parts needed for a N/A engine build for my '92 G-GS. I have discovered something that has halted progress for the moment, however.
The ECU in my G-GS came with a knock board installed (Yes, it's strange. This fact was discussed in ThIs thread.). The original block from the GS had a raised, tapped spot in which a knock sensor was installed:
The problem is that the block I am using for the engine build (not the original block) does not have this raised area:
(Actual picture of block; the area for the K.S. is not raised, with an unthreaded, shallow hole [instead of raised, and threaded])
I am asking for advice on what to do about this. Being that the engine is N/A, a knock sensor isn't 1st priority; on the other hand, if I leave the sensor unplugged, the ECU will revert to a set knocksum, and retard timing by default (I do not need an even slower car /ubbthreads/images/graemlins/grin.gif). I would rather not buy another ECU (this one has been recapped, and works great), and I would like to use this block, as I have already prepared it (cleaned, painted, freeze-plugs). I am not using the original block due to huge amounts of cylinder wear. The pictured block I am using is the original block from my N/A '90 G-GSX, and is in great condition.
Maybe it's possible to drill the block, even without the raised area? It does have a hole there, but I think drilling too much might puncture the water jacket. Or, maybe it's possible to "fool" the ECU somehow?
I would appreciate any suggestions/advice. Let me know if you need any more information.