Questions about Exhaust systems, Catalytic Converters and Headers/Manifolds

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8
votes
1answer
49 views

Is it possible to extend the length of the shaft on an existing turbocharger, further distancing the compressor from the turbine?

I'm toying with turbojet engine ideas, and over the course of my research it occurred to me that the combustion chamber could be more power-efficient and space-efficient if it was aligned in the ...
4
votes
0answers
41 views

Using clutch with exhaust brake and compression brake

My truck supports 2 types of engine brakes: Compression release brake Exhaust brake Both can be selectively deactivated using switches. While pressing clutch pedal for changing gears during ...
19
votes
2answers
1k views

Why do two-stroke engine exhaust pipes look so strange?

Two stroke gasoline engine exhaust pipes are shaped strange. They expand into a wide diameter and then shrink down to a very small diameter where the exhaust gasses emerge into the environment. Why ...
7
votes
2answers
60 views

Do straight/short pipes burn out valves?

I have heard that straight/short/custom pipes can burn out valves on an engine. However, with a 4-cylinder Ford Model A engine, I have been told this is not the case because it has such low ...
5
votes
2answers
43 views

Exhaust Backpressure and Its Impact on LTFT Values

This is a follow-up from my initial question which can be found here : LTFT and STFT values are off and don't make sense. Car : BMW 2015 F10 M5 Modifications : Eisenmann Race Catback Exhaust, ...
4
votes
1answer
34 views

Does exhaust gas pressure impact the output of narrowband lambdas?

In the course of writing this answer I learnt that the current output of wideband lambda sensors is sensitive to exhaust gas pressure. This technical document for Bosch LSU 4.2 widebands explains how ...
9
votes
1answer
47 views

What Can I Learn From Exhaust Manifold Temps?

I was wondering what I can learn from the temperatures on the individual exhaust pipes coming out of each cylinder. The question is general, and my specific example is on my 98 Mazda 626 GF 2L. Last ...
5
votes
1answer
100 views

Why no exhaust gas turbine generator in hybrid vehicles?

I found something interesting on Wikipedia today: a hybrid turbocharger. This is a device that charges a battery with an exhaust gas turbine, and at the same time operates an air compressor using the ...
6
votes
1answer
40 views

2009 Aprilia RSV1000 - Piggy Back ECU, Should I get one?

I have an Aprilia Tuono, 2009. It seems to run lean after putting an Akrapovic exhaust on it. It makes exhaust popping sounds on deceleration. My boyfriend said I need a power commander on it to ...
3
votes
1answer
40 views

Is a chuffing sound from a 1999 Saab 9-3 sign of an exhaust leak?

I hear this sound when running alongside curbs or concrete walls with RPMs below 2000. I suspect it's a leaking exhaust manifold gasket, and intend to replace this in the near future. When I try to ...
8
votes
4answers
210 views

How can I tell if I have bad cats?

No, not that cat! Catalytic converters - or "cats" - have a nasty habit of failing with age. What are the symptoms associated with a cat that's gone bad? Are there any tests that could ...
5
votes
1answer
61 views

Car leaks oil when driving, Oil from exhaust pipe

Car leaks oil when driving not while parked. The bottom of the vehicle is covered with oil and there's white smoke coming from tail pipe when driving. It sat and there no oil puddle in garage but ...
3
votes
2answers
591 views

What is the “dollar bill” test?

One of the questions recently made reference to an exhaust failing the "dollar bill" test. How does one perform it and what does it tell you?
5
votes
1answer
289 views

15 ppm of CO levels inside car

I constantly measure 15 ppm of CO inside my car after a long commute (~1 hour of continuous driving, but the overall trip can take from 1.5 to 2 hours depending on my destinations before heading ...
3
votes
2answers
37 views

I just found out that my muffler wasn't even connected. I was driving it around lots is that bad?

I have an 1991 Ford Explorer. I just found out my muffler wasn't connected. I was wondering why it was so loud when I got it. I have been driving it for a month now and I'm hoping I didn't wreck ...
0
votes
2answers
49 views

2006 Scion Tc Base - lots of vibration and bad smell from exhaust

2006 Scion Tc base automatic transmission, has 149k miles on it.The car used to vibrate a little at idle. It suddenly started vibrating a lot. It is shaking as if there's an earthquake! Idle rpm at ...
2
votes
1answer
27 views

Bad exhaust leak or valve interference after HG change?

2006 Volvo s40 2.4i I replaced my HG the other day (I've done a few before with no problems). I was very careful marking everything. Locking the cams together with a cam locking tool specific for ...
2
votes
0answers
17 views

Mercedes veto Exhaust

Just got a new exhaust fitted, the part that goes from the front wheel area all the way to the back. And NOW there is a smell of exhaust fumes in the veacle, that seams to be coming from the vents. ...
2
votes
1answer
89 views

White smoke is coming from my engine. how do i find out what it is?

I own a 92 chevy lumina, when i drive or let it run for a little bit it will smoke from underneath the upper radiator hose. it is not the actual radiator hose as i changed it thinking it was that. ...
5
votes
2answers
342 views

Will Driving 100 Miles With a Misfire Damage My Car?

Background: I have a 2002 Dodge Dakota Quad Cab slt with 4.7L Magnum V8. My check engine light came on when I was at work. I then drove 20 miles home to my house, pulled out my scan tool and ...
2
votes
2answers
370 views

What does it mean when soot is coming out of my exhaust?

I have a 2001 Jetta Wagon (Golf Variant is caller in my country). Petrol engine. Usually rides school and back (15 miles) with engine between 2000 and 3000 rpm. Just did a 300 mile trip at ...
4
votes
1answer
160 views

How hot does an exhaust manifold get?

If I want to use a non-contact infrared thermometer to read the temperature of each cylinder at the exhaust port during idle, how high of a reading should the thermometer be able to handle?
6
votes
1answer
90 views

Volvo S80 II 2.4 D5 DPF (Diesel Particulate Filter) regeneration conditions

What are the conditions required for the DPF (Diesel Particulate Filter) regeneration? Is it only exhaust temperature or speed and RPM also? I'm wondering if DPF can regenerate while car is at ...
0
votes
1answer
45 views

Chiptuning for a car with DPF (Diesel Particulate Filter) is a bad idea?

I know that it is possible to disable DPF (Diesel Particulate Filter). I'm wondering how bad it could be to leave DPF (Diesel Particulate Filter) functioning and add a chip to a car?
2
votes
2answers
279 views

Does hitting the exhaust on bumps (Bottoming Out) damage my car?

I see hundreds of exhaust scrapes on speed humps and things, or general gashes in the direction in which cars travel over them. Does hitting the exhaust on bumps damage the car? It's probably ...
2
votes
2answers
470 views

Is it OK to not fix a power steering rack leak?

I have a 97 Honda Accord with 122K miles on it. Recently, if I drive over bumpy roads, I'll sometimes feel vibrations seemingly from the underside of the car, almost as if something might be loose. ...
5
votes
1answer
558 views

Clamping two 2" exhaust pipes together

I have a replacement exhaust system that I just bought. Just has a tailpipe, muffler, and a flange that connects to the header. What would be the best way to join these pipes, aside from welding it? ...
1
vote
1answer
56 views

Gasket sealant with exhaust manifold

I am about to reinstall my exhaust manifold on a V6 Tacoma and I was contemplating the need for gasket sealant. When the old one came off, it didn't look like it had any sealant so my guess is no. ...
2
votes
1answer
58 views

Removing the smog pump on an 84 Ranger

I have an old 84 Ranger with a 2.8L V6 and I'm trying to squeeze out as much power out of the engine as possible. The cat had been removed by the last owner, so the pump was essentially just pushing ...
7
votes
3answers
2k views

Effects of leaky exhaust valves

While rebuilding my valves, I noticed that 4 out of 6 exhaust valves on one side of the V6 engine were leaking after lapping and I had to relap them. I determined that by doing a water test. I am ...
2
votes
0answers
195 views

(Video) Very Loud Hissing/Spraying Noise, Transmission? [closed]

Ok, very weird situation: 2001 Mitsubishi Montero Loud hissing sound coming out of front passenger wheel well when accelerating. Here is a video: https://youtu.be/tiSFdoniRm0 I have put it in park ...
-1
votes
1answer
95 views

Suggestions for replacing/upgrading exhaust/silencer for a 125cc Motorbike [closed]

I have a 125cc Yamaha Gladiator SS125, which is about 3 years old. I had my stock air filter (paper-based) removed and installed a K&N conical filter about a year ago. I wanted to know if anyone ...
5
votes
1answer
159 views

Rust underneath rear of car (Toyota Mk1 MR2)

I have recently acquired an old (1989) Mk1 Toyota MR2 and took a few photos of the underside rear of the vehicle. There seems to be a fair amount of rusting on the rear axle and gear box: gear ...
2
votes
1answer
114 views

Rusty exhaust manifolds

Most of the engine on my 2007 V6 Tacoma is in a really good shape but both exhaust manifolds coming out of the engine block are really rusty. Q1: Is that a reason to worry or replace them, provided ...
1
vote
1answer
62 views

2000 Toyota Celica GTS aftermarket exhaust system

I want to get a MagnaFlow Cat and Muffler. I need confirmation that the parts I've found online will indeed fit my Celica. I'm ignorant when it comes to cars (I filled the radiator coolant overflow ...
1
vote
1answer
80 views

Damaged Muffler Degrades Performance

I purchased a replacement muffler from the internet for my 2004 Xterra. It arrived yesterday but had some noticeable dents in the resonator. My question is: will these dings degrade the sound ...
1
vote
1answer
122 views

Split flange for converter-resonator coupling?

'04 Cavalier. The converter outlet coupling failed - the bolts broke, and the bolt holes in both flanges are pretty much useless. Given the age of the car, and the cost of replacing all the ...
3
votes
1answer
1k views

How long will my motor last having clogged catalytic converters?

My catalytic converters have been clogged for awhile, and the o2 sensors need changed because of this. What is it doing to my engine? And gas mileage for that matter? If i take out my ...
4
votes
2answers
113 views

Lost torque on my Yamaha XVS650

I have a Yamaha DragStar 650 1999. I have a Highway Hawk exhaust and I removed the baffles. Now the exhaust is completely open. When the engine is cold I can start it only if I pull the acceleration ...
5
votes
1answer
170 views

Car feels like it's filling up with fumes

I bought a used 2000 volvo s80 with around 93k on the odometer. I was driving the other day and I felt sort of sick. At first I thought it was some dirt on the floor that got into the air. But upon ...
2
votes
3answers
187 views

2004 Subaru XT under powered and smoking after oil change

Over the weekend I traveled home and back: about 140mi each way. About half way there the engine light came on, and, realizing it had been about 4500 miles since my last oil change, I added oil to the ...
1
vote
1answer
469 views

Changing Exhaust on Royal Enfield

I want to change bend pipe and exhaust on my Royal Enfield Electra 5 speed 350 CC bike, it has old engine (NOT UCE). To my knowledge there are too many options like. Free flow mufflers, short bottle ...
4
votes
2answers
714 views

Single Cylinder 2 stroke bike with twin exhaust, will it need two chambered exhausts?

I am asking specifically about Yezdi (not in production anymore) 250/350cc motorcycles. Yezdi RoadKing was a 250cc single cylinder two stroke with twin exhaust. If upgrading to a calculated chambered ...
2
votes
1answer
68 views

Emissions codes after oil through exhaust

I have a 2003 Subaru Legacy L with the EJ251. I rebuilt the engine because of a thrown rod. There was significant damage to the shortblock, which resulted in a significant amount of oil escaping the ...
4
votes
1answer
214 views

Is it normal to attach a catalytic converter with U-bolts?

I need to replace my catalytic converter. The current one is held in place by U-bolts. Two U-bolts between the cat and the manifold exhaust pipe (looks like a patch). One holding the exhaust pipe to ...
1
vote
3answers
96 views

2013 Subaru WRX - Stripped exhaust bolt

I got an exhaust and I was putting it on my car (2013 wrx) and had to disconnect the exhaust after the midpipe. The bolts were rusted so I PB blasted them, and then got one set of bolts off. When I ...
0
votes
1answer
241 views

Blue smoke upon acceleration and pinking

I have a Y12 Wingroad Nissan. While driving at 100km/hr and I stop, and begin driving again, I see a lot of blue smoke from exhaust for a little while. I also get a flat spot and pinking when ...
3
votes
2answers
660 views

MINI Cooper Oil Leak

I bought a 2007 MINI Cooper 8/27/14. On 9/9, as I drove to work, I noticed smoke coming from the back & front of the car. When I drove home late that night, the car was not smoking. After that ...
4
votes
3answers
5k views

What does it take for a modern muscle car to sound like a classic muscle car?

To preface, I would grade my exhaust knowledge with a "B-". I know what the major components are and what they do, but I don't know if and when certain exhaust parts became mandated or introduced ...
4
votes
1answer
69 views

Exhaust on a replaced motor

I recently had to change the motor in my 2004 Hyundai Sonata. I bought a used one from the junkyard, and it fired right up after I got it put in, and all the wires, hoses, etc. connected. The only ...