What's wrong with this muffler?

[mudski]

According to fleabay, stainless steel ain't any dearer than mild steel.
It's that ones that're purposely made for Patrol arent' available cheaper.
I wonder whether I can modify a standard stainless steel muffler of the same size to suit mine.

Of course you can. A muffler is just made at a generic size, and in and out orientation. Its the pipes on either side that matters.

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[dom14]

Of course you can. A muffler is just made at a generic size, and in and out orientation. Its the pipes on either side that matters.

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Thanx Mudski mate.
That's what I've been waiting to hear. I like my hobby.
Cheers
Dom

[dom14]

I'm thinking about getting a reasonably close stainless steel muffler from a wrecker and modify it to suit mine.
Getting a mild steel used muffler is a waste of money I reckon, 'cos it may end up the same way in no time?

[garett]

mufflers are over rated just put in a bit of pipe ... :P

[mudnut]

You've gone around this all wrong, Dom.

It goes like this: "Honey, the muffler has got some loose baffles (truth), and I have been informed that they could block the muffler and stuff the engine (truth).

After all the trouble I've had with the whole system it would be easier to get a whole new system than mucking around with individual components (some what true). So the engine pipe flange doesn't stuff up, we should get headers (totally true). They should also give us better economy (truth).

Do not however mention the extra ten percent (achievable, so truth anyway) increase in horsepower.

[GeeYou8]

On the subject of stainless vs aluminiumised steel, the stainless is more brittle & prone to cracking. Unless it is a show car, go with the aluminiumised steel.

[dom14]

You've gone around this all wrong, Dom.

It goes like this: "Honey, the muffler has got some loose baffles (truth), and I have been informed that they could block the muffler and stuff the engine (truth).

After all the trouble I've had with the whole system it would be easier to get a whole new system than mucking around with individual components (some what true). So the engine pipe flange doesn't stuff up, we should get headers (totally true). They should also give us better economy (truth).

Do not however mention the extra ten percent (achievable, so truth anyway) increase in horsepower.

Yeah, I know you have evidence to prove the extractors improve the horsepower without upgrading the pipes or the muffler, but I reckon you got lucky with a good set of extractors and a good carby tune up.
Extractors are cheap enough to buy secondhand, but way too much PITA for me right now.
Muffler's gota be replaced. No doubt about that.

Here's the vacuum gauge test on exhaust back pressure.
As you can see the the vacuum isn't dropping as I increase and hold the rpm.

https://www.youtube.com/watch?v=UTK1...ature=youtu.be

So, it appears there isn't much back pressure at the moment, according the vacuum gauge test, but I'm
sure the muffler is gone anyway. Next time the baffles start rattling inside it might block the whole thing.

BTW, it appears it's holding at a higher level(23 InHg) at steady high revving than at idling vacuum(20), then goes even higher(30) when I let go the high rpm.

Does that look all good?!

[dom14]

On the subject of stainless vs aluminiumised steel, the stainless is more brittle & prone to cracking. Unless it is a show car, go with the aluminiumised steel.

Ok, cool thanx. I didn't know that.
Cheers

[dom14]

mufflers are over rated just put in a bit of pipe ... :P

I would, when I get to turbo arena.

[mudnut]

Yeah, I know you have evidence to prove the extractors improve the horsepower without upgrading the pipes or the muffler, but I reckon you got lucky with a good set of extractors and a good carby tune up.
Extractors are cheap enough to buy secondhand, but way too much PITA for me right now.
Muffler's gota be replaced. No doubt about that.

Here's the vacuum gauge test on exhaust back pressure.
As you can see the the vacuum isn't dropping as I increase and hold the rpm.

https://www.youtube.com/watch?v=UTK1...ature=youtu.be

So, it appears there isn't much back pressure at the moment, according the vacuum gauge test, but I'm
sure the muffler is gone anyway. Next time the baffles start rattling inside it might block the whole thing.

BTW, it appears it's holding at a higher level(23 InHg) at steady high revving than at idling vacuum(20), then goes even higher(30) when I let go the high rpm.

Does that look all good?!

Dunno. Maybe @nissannewby can tell you what is happening.