Built KA24 won't run longer than 3 minutes - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

treydeal · 05-03-2002, 08:13 PM

I have a 95 240SX SE that had around 120k on it, and I decided I wanted some more power. Turbo seemed like the way to go, so I built the engine low compression using the shortened Arias piston/lengthened Carrillo rod combination. The block was bored .020 over and cleaned up, and all parts that are normally replaced during an engine rebuild (bearings, seals, gaskets, timing equipment) was replaced with brand new parts. Also a full 3-angle valve job was done on the head. The engine cranked right up and runs great, but only for about 3 minutes or so. We hooked up a timing light and the timing retards to the point of the car just cutting off, regardless of throttle position. Even at WOT, the best we could do is keep the car at 2,000rpm. By the way, we also took the knock sensor off of the side of the block and held it away from the engine while it was running, so it's not that. Anyone have any ideas what could be wrong? We've been troubleshooting for about a month now, and even a trusted Nissan specialist nearby has no idea what's wrong with the engine. Thanks in advance!

05-03-2002, 08:13 PM	#1
treydeal Join Date: May 2002 Posts: 2 Trader Rating: (0) Feedback Score: 0 reviews	I have a 95 240SX SE that had around 120k on it, and I decided I wanted some more power. Turbo seemed like the way to go, so I built the engine low compression using the shortened Arias piston/lengthened Carrillo rod combination. The block was bored .020 over and cleaned up, and all parts that are normally replaced during an engine rebuild (bearings, seals, gaskets, timing equipment) was replaced with brand new parts. Also a full 3-angle valve job was done on the head. The engine cranked right up and runs great, but only for about 3 minutes or so. We hooked up a timing light and the timing retards to the point of the car just cutting off, regardless of throttle position. Even at WOT, the best we could do is keep the car at 2,000rpm. By the way, we also took the knock sensor off of the side of the block and held it away from the engine while it was running, so it's not that. Anyone have any ideas what could be wrong? We've been troubleshooting for about a month now, and even a trusted Nissan specialist nearby has no idea what's wrong with the engine. Thanks in advance!