Post by hermitjohn on Jan 23, 2018 17:04:49 GMT
My 94 Ranger with 4.0L exhaust has become noisy. But only after engine warms up fully. Its pretty quiet when engine is cold. I replaced muffler and that helped. Think one I removed must been factory original, odd looking thing with ridges on sides of it. Never seen one like it. Still annoying. Its not noisy enough that cop would stop me unless I downshifted and really stomped on it right in front of him, but noisy enough to annoy me. Especially if I get rpm up around 2500rpm for more power or hiway speed. Teens like noisy cars, old men like them quiet!
Seems odd since things expand when hot so you would think it would be noisy cold and quiet as it warmed up.... if it were a crack in manifold or leaky joint. Plus listening at end of exhaust, noise coming out there not at some joint. I guess I could add a second muffler in series. In olden days the hotrodders tired of cop tickets for noisy muffler would install dual glass packs. LONG ones. If I remember something like three to four foot long! So they still flowed pretty good at high rpm but controlled noise pretty well too.
I will say its doing pretty good with the antique Chevy SM420 transmission. Its a slow shifting old heavy duty truck transmission, and thats that. I was going for cheap and durable, not high performance. Reminds me lot of couple 60s era half ton Chevies I had with same transmission. Engine has about same power as an old Chevy 230 cubic inch pre-pollution era straight six. It will get you there, just no sports car. Taking me some adapting in my driving style. Torque is maxxed in power curve up around 2600rpm. I am used to the old Ford 300-6 with max torque at 1800rpm and quite bit torque just above idle. Meaning I have a tendency to lug the 4.0L shifting up at too low of an rpm.
Seems odd since things expand when hot so you would think it would be noisy cold and quiet as it warmed up.... if it were a crack in manifold or leaky joint. Plus listening at end of exhaust, noise coming out there not at some joint. I guess I could add a second muffler in series. In olden days the hotrodders tired of cop tickets for noisy muffler would install dual glass packs. LONG ones. If I remember something like three to four foot long! So they still flowed pretty good at high rpm but controlled noise pretty well too.
I will say its doing pretty good with the antique Chevy SM420 transmission. Its a slow shifting old heavy duty truck transmission, and thats that. I was going for cheap and durable, not high performance. Reminds me lot of couple 60s era half ton Chevies I had with same transmission. Engine has about same power as an old Chevy 230 cubic inch pre-pollution era straight six. It will get you there, just no sports car. Taking me some adapting in my driving style. Torque is maxxed in power curve up around 2600rpm. I am used to the old Ford 300-6 with max torque at 1800rpm and quite bit torque just above idle. Meaning I have a tendency to lug the 4.0L shifting up at too low of an rpm.