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ZUKIWORLD Discussion Forum => Technical Discussion - Beginner / Repair => Topic started by: MX5ZUKIWRX on June 16, 2009, 07:53:28 PM

Title: Muffler required?
Post by: MX5ZUKIWRX on June 16, 2009, 07:53:28 PM: 87 Samurai Tintop, all stock, is there enough back pressure created by the CAT to protect the valves from burning up if a free flow muffler or even no muffler is installed?

Thanks,
DiJiT
Title: Re: Muffler required?
Post by: Lindenmooch on June 16, 2009, 11:05:19 PM: I don't know if this will help or not...as I don't know the answer to your question.....but I ran my 1991 Tracker with just a cat and a short tailpipe for almost half a year with no issues, and now I have a muffler and no cat. And the motors in both vehicles are pretty similar. My tracker sounds great...doesn't tick or rattle....doesn't burn any oil and create any smoke.

Sorry I can't help further....But I hope you can get some confidence from this anyway.

-Mooch
Title: Re: Muffler required?
Post by: Amilla on June 17, 2009, 07:00:36 AM: The only time I would worry about damaging the valves, is if you were running with no exhaust manifold all together.

I too ran a cat with a small piece of tail pipe hanging out, no problems.....just annoyingly loud.

Amilla
Title: Re: Muffler required?
Post by: Drone637 on June 17, 2009, 12:16:09 PM: I asked a wheeling buddy of mine who works at the GM garage about this.

Quote
To check your back pressure on a gas engine you would remove the O2 sensor and thread in a fitting that you use a fuel/vac gauge on. Shouldn't have no more than 3 lbs back pressure.
Title: Re: Muffler required?
Post by: Amilla on June 18, 2009, 06:49:55 AM: Quote from: Drone637 on June 17, 2009, 12:16:09 PM
I asked a wheeling buddy of mine who works at the GM garage about this.

Quote
To check your back pressure on a gas engine you would remove the O2 sensor and thread in a fitting that you use a fuel/vac gauge on. Shouldn't have no more than 3 lbs back pressure.

I did not know that, too bad the person i bought my samurai from cross threaded the O2 censor in to the header, its now in for life.... ???

Amilla
Title: Re: Muffler required?
Post by: bentparts on June 24, 2009, 06:08:50 AM: You can buy a weld in o2 sensor bung from most supply houses. They're only a couple of sizes. Drill, weld in new threaded bung, install new sensor, so not cross thread haha, and just leave the old one in as a plug. I always put a bit of anti seize in the threads.