- Joined
- 31 December 2010
- Messages
- 309
The NSX community paranoia must have influenced me a little. I normally don't worry about these things, except this solution was such a low cost and simple answer it doesn't hurt to have.
Problem: Stock NSX harmonic balancer could fail, eating through the timing belt cover and causing timing belt to jump and possible catastrophic engine failure. Since I drive with the radio fairly loud, no symptoms would be noticed until it's too late. *if* it ever were to happen. The AZ dry heat could accelerate the destruction of rubber components even on newly manufactured components even before the timing belt service interval.
Solution & Theory of operation: Simple burgler alarm kits with normally closed loops that use foil wire to detect open circuits send an audible notification. I glued a thin wire (wire wrap) to the timing belt cover instead of foil. This wire would break pretty easy at the first sign of contact from the HB.
I tapped into the key on hot feeding into the main relay and tucked the alarm circuit inside the vehicle. Since this circuit is designed for 6V and not 12, I purchased a 6V voltage regulator (L7806CV) from digikey and incorporated it into the board. You may want to add a heat sink to the regulator as it can get hot when driving the alarm, however it's optional since there's thermal protection within the regulator itself.
Cost: ~$15
Parts: Wire wrap style wire, L7806CV voltage regulator, 6280 Chaney burgler alarm kit. Optional is a box to contain the circuit and heat sink for the regulator.
http://www.kitsusa.net/phpstore/html/K-6280-Burglar-Alarm-soldering-kit-261.html
http://parts.digikey.com/1/parts/610663-ic-regulator-pos-6v-220-l7806cv.html
The attached image is looking down at the crank pulley, you can barely see the thin red wire, but it loops around the back side of the crank. You could choose another color to keep things neat.
Any questions feel free to ask.
Problem: Stock NSX harmonic balancer could fail, eating through the timing belt cover and causing timing belt to jump and possible catastrophic engine failure. Since I drive with the radio fairly loud, no symptoms would be noticed until it's too late. *if* it ever were to happen. The AZ dry heat could accelerate the destruction of rubber components even on newly manufactured components even before the timing belt service interval.
Solution & Theory of operation: Simple burgler alarm kits with normally closed loops that use foil wire to detect open circuits send an audible notification. I glued a thin wire (wire wrap) to the timing belt cover instead of foil. This wire would break pretty easy at the first sign of contact from the HB.
I tapped into the key on hot feeding into the main relay and tucked the alarm circuit inside the vehicle. Since this circuit is designed for 6V and not 12, I purchased a 6V voltage regulator (L7806CV) from digikey and incorporated it into the board. You may want to add a heat sink to the regulator as it can get hot when driving the alarm, however it's optional since there's thermal protection within the regulator itself.
Cost: ~$15
Parts: Wire wrap style wire, L7806CV voltage regulator, 6280 Chaney burgler alarm kit. Optional is a box to contain the circuit and heat sink for the regulator.
http://www.kitsusa.net/phpstore/html/K-6280-Burglar-Alarm-soldering-kit-261.html
http://parts.digikey.com/1/parts/610663-ic-regulator-pos-6v-220-l7806cv.html
The attached image is looking down at the crank pulley, you can barely see the thin red wire, but it loops around the back side of the crank. You could choose another color to keep things neat.
Any questions feel free to ask.
.
