More power from a 2.5 NA
Posted: Tue May 07, 2013 10:07 am
It's true! More power!
My anemic little 2.5 NA (Naturally Asphyxiated) diesel powered LR 90 has noticeably more power after taking it to Minute Muffler and getting a blown exhaust seal repaired.
For a few months now I've experienced increasing exhaust noise from the engine bay. I was convinced it was the head to manifold gasket, even more convinced when I changed it, by the loose nuts and slight evidence of blow-by. Unfortunately I still had excessive noise afterwards. Stuffing a rag in the tail pipe quickly showed a leak at the down pipe connection at the manifold. Off to the repair shop here in Duncan where they got me fixed up. Of course, once they hoisted the 90 it was evident the muffler was past its "best before date"; actually it had a big split down its side. They fixed the leak at the down pipe, installed a new muffler and re-secured the failed pipe hangers.
I don't fully understand the physics of it, but there is no doubt about it. The little 2.5 diesel has more power/speed up hills now. I guess I can bend my mind around the idea of mass and inertia of an exhaust pulse from one cylinder "drawing" the gasses from the next contributing to more power instead of just leaking to atmosphere at a failed joint. Or maybe Olive is just happier now that she has had some TLC.
Of note: Minute Muffler in Duncan is where Dixon of Rock Island 4X4 (formerly known as Rock Island Rovers) has service and repair work done on the Land Rovers he imports. They now have some hands-on knowledge of working on Land Rovers.
My anemic little 2.5 NA (Naturally Asphyxiated) diesel powered LR 90 has noticeably more power after taking it to Minute Muffler and getting a blown exhaust seal repaired.
For a few months now I've experienced increasing exhaust noise from the engine bay. I was convinced it was the head to manifold gasket, even more convinced when I changed it, by the loose nuts and slight evidence of blow-by. Unfortunately I still had excessive noise afterwards. Stuffing a rag in the tail pipe quickly showed a leak at the down pipe connection at the manifold. Off to the repair shop here in Duncan where they got me fixed up. Of course, once they hoisted the 90 it was evident the muffler was past its "best before date"; actually it had a big split down its side. They fixed the leak at the down pipe, installed a new muffler and re-secured the failed pipe hangers.
I don't fully understand the physics of it, but there is no doubt about it. The little 2.5 diesel has more power/speed up hills now. I guess I can bend my mind around the idea of mass and inertia of an exhaust pulse from one cylinder "drawing" the gasses from the next contributing to more power instead of just leaking to atmosphere at a failed joint. Or maybe Olive is just happier now that she has had some TLC.
Of note: Minute Muffler in Duncan is where Dixon of Rock Island 4X4 (formerly known as Rock Island Rovers) has service and repair work done on the Land Rovers he imports. They now have some hands-on knowledge of working on Land Rovers.