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Possible to replace 2.7 with 2.5 or am I nuts?
Hello All ,
I have a 2008 300LX with the 2.7. The engine that cracked a rod 20K miles ago, replaced rod, crank, pistons, rings water and oil pumps. Have been using synthetic 5-20 ever since. A tick-tick became a very loud knock after full throttle accel to merge into traffic, nursed it back about 1 mile to get back home, made it, and shut down. Oil level right on full level, no water in oil, pulled oil pan and crank is broken right after the first two cylinders. Question is, is it feasible to replace the 2.7 with a 3.5 or do I have to either repair this 2.7 turd again or junk the car? Bought the car with 136K miles on it and the engine was rebuilt 1K miles after that. Any help will be appreciated. Many thanks, Ed |
I have heard of it being done but have no personal experience with it. It is certainly more feasible than replacing a 3.5 with a 5.7.
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Don't do it (replace the 2.7 with .3.5)!! Engine swaps on modern vehicles with multiple computers, sensors, connectors,software, etc are a major undertaking.
I would repair or replace that 2.7 no matter how fed up with it you are.. There must be suitable 2.7s on the used market. |
Originally Posted by 300LX
(Post 116885)
Hello All ,
I have a 2008 300LX with the 2.7. The engine that cracked a rod 20K miles ago, replaced rod, crank, pistons, rings water and oil pumps. Have been using synthetic 5-20 ever since. A tick-tick became a very loud knock after full throttle accel to merge into traffic, nursed it back about 1 mile to get back home, made it, and shut down. Oil level right on full level, no water in oil, pulled oil pan and crank is broken right after the first two cylinders. Question is, is it feasible to replace the 2.7 with a 3.5 or do I have to either repair this 2.7 turd again or junk the car? Bought the car with 136K miles on it and the engine was rebuilt 1K miles after that. Any help will be appreciated. Many thanks, Ed I'm currently doing the same swap in my Magnum right now. Also, the 2.7 has better gearing, so putting the 3.5L in will benefit from it. You will need a long block though, because the air intake etc do not swap over. |
Ed, If you do go ahead with the swap be sure to keep us informed on how it sorts out.
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The only thing that may be an issue (and I haven't verified it yet) is you may need a 3.5L engine wiring harness. I have read both that you need one, and that the 2.7 harness will work.
If you do need the engine harness just make sure you get the one that also matches your transmission. That may be why there are conflicting stories, possibly someone tried a engine harness from a car with a 4LQE transmission on a NAG1 transmission. Hope that helps. This is my current 3.5L build. Almost finished. https://cimg4.ibsrv.net/gimg/www.chr...75db730a65.jpg This is my current 3.5L Build |
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