Go Back   Team-BHP > Under the Hood > Modifications & Accessories


Reply
 
Thread Tools Search this Thread
Old 16th April 2006, 12:06   #1
BHPian
 
raghuram.cg's Avatar
 
Join Date: Jan 2006
Location: Bangalore
Posts: 171
Thanked: 16 Times
Default Carb Zen w/o the muffler

Friends,
Just today - removed the muffler from the 99 ZEN.The exhaust note is racy and there is a feeling of more power when driven.
The engine has done 92K kms..

A few questions
1)Does this affect the engine in any way.I have heard that removing the muffler is detrimental.

2)By what does the FE go down.

3)is it a good idea to just have a straight pipe from the cat con and continue to use the vehicle.

Any thoughts on this would help.

Thanks
Raghuram C G
Bangalore
raghuram.cg is offline   Reply With Quote
Old 16th April 2006, 14:34   #2
BHPian
 
angelfire's Avatar
 
Join Date: Sep 2005
Location: Mangalore/Chicago
Posts: 251
Thanked: 0 Times
Default

hi there...
wel one of my friend has tried it out...a straight pipe from the cat...man!!...the exhaust note is amazin....but there is a drsatic drop in FE....thats mostly because the sound`s gonna be so great that you tend to rev a lot.....nd effects on the engine....guess the gurus wil it answer for you...
angelfire is offline   Reply With Quote
Old 16th April 2006, 17:41   #3
BHPian
 
buzzin_hornets's Avatar
 
Join Date: Dec 2005
Location: Mumbai
Posts: 233
Thanked: 0 Times
Default

Bad idea dude!! get a sport muffler fitted or put the OE muffler back! ur gonna damage ur engine!!!!
buzzin_hornets is offline   Reply With Quote
Old 16th April 2006, 18:41   #4
Distinguished - BHPian
 
Mpower's Avatar
 
Join Date: Mar 2005
Location: Bangalore
Posts: 10,432
Thanked: 1,682 Times
Default

Quote:
Originally Posted by buzzin_hornets
Bad idea dude!! get a sport muffler fitted or put the OE muffler back! ur gonna damage ur engine!!!!
Can you explain how ??
Mpower is offline   Reply With Quote
Old 17th April 2006, 15:17   #5
BHPian
 
raghuram.cg's Avatar
 
Join Date: Jan 2006
Location: Bangalore
Posts: 171
Thanked: 16 Times
Default

Can someone shed more light on this matter.I know that it harms the engine.What actually happens?

Raghu
raghuram.cg is offline   Reply With Quote
Old 18th April 2006, 15:52   #6
BHPian
 
raghuram.cg's Avatar
 
Join Date: Jan 2006
Location: Bangalore
Posts: 171
Thanked: 16 Times
Default

Seems like al are busy with the Drag at Jakkur on sunday .Any replies are appreciated on the questions.
Raghu
raghuram.cg is offline   Reply With Quote
Old 18th April 2006, 17:26   #7
BHPian
 
Fuelled's Avatar
 
Join Date: Dec 2005
Location: delhi
Posts: 252
Thanked: Once
Default

Not Sure but i've heard that too free flow a exhaust lets out all burnt gases much quicker from the engine manifold(a set of pipes that collect exhaust gases from the engine cylinder) area..
though this reduces force needed to push out burnt gases.. but it causes the valves to burn out.


If wrong, some one please provide the correct info... cause this question has dogged me too over past some time.
Fuelled is offline   Reply With Quote
Old 18th April 2006, 17:54   #8
Senior - BHPian
 
Psycho's Avatar
 
Join Date: Jul 2004
Location: Bangalore
Posts: 1,042
Thanked: 95 Times
Default

Points to be noted if you remove the muffler:

1) Some engines require a bit of back pressure for the initial torque which is created by the muffler this may also lead to drop in the FE due to free revving
2) Mufflers are meant to reduce noise let them be a freeflow type or a OE
Psycho is offline   Reply With Quote
Old 18th April 2006, 18:08   #9
BHPian
 
Join Date: Mar 2005
Location: Trivandrum
Posts: 861
Thanked: 620 Times
Default Back Pressure

I think the key word here is "back pressure".

When you have a common exhaust manifold/chamber all the cylinders put out the exhaust into the same chamber. Now the firing order in most cars being sequential this causes a situation where you have the exhaust gas from one cylinder in the chamber lowering the difference in pressure between the chamber and the next cylinder due to expel the exhaust. This is what is called "back pressure". the two effects here are

- The pressure in the cylinder is very high compared to the exhaust manifold and enables the sucking out of the exhaust from the cylinder. However the back pressure results in comparitively less exhaust sucked out compared to what will be if you had no back pressure.
- the back pressure kind of cushions your piston head and valves. So this technically entends the life of your engine and reduces wear and tear.
- All restrictive components along the exhaust line contribute to this build up in back pressure i.e your manifold design, the cat con, muffler etc. So removing any of these restrictive components decreases your back pressure.

I think the second point here is what is damaging to your engine. However this might be over a lot of time or mileage. it isn't anything thats gonna happen in a very short period of time. i also haven't seen much issue made of this when I was researching for fitting a free flow exhaust for my car.

Hope this helps.

Drive on!!
Shibu

P.S - i think there was a technical article on back pressure somewhere on this forum but I can't seem to find it. Will post the link when i do.
shibujp is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
the 90bhp+ carb zen speedsatya Modifications & Accessories 6 14th November 2009 11:00
99'ZEN carb to ZEN mpfi.... Balram Modifications & Accessories 17 10th December 2006 09:04
K&N Required For A Zen Carb. greddy Modifications & Accessories 11 1st November 2006 16:27
carb zen suspension options? heavy_foot Technical Stuff 14 15th May 2005 11:59
zen muffler for sale manson Shifting gears 31 31st January 2005 22:53


All times are GMT +5.5. The time now is 20:42.

Copyright 2000 - 2017, Team-BHP.com
Proudly powered by E2E Networks