SupraStar Posted October 11, 2003 Report Share Posted October 11, 2003 Anyone know the size of the exhaust is.. After the cat specifically, if that makes a difference... Thanks -Chris Quote Link to comment Share on other sites More sharing options...
Aaron Posted October 11, 2003 Report Share Posted October 11, 2003 it will be the same size b4 and after the cat, but what kinda car with what motor do you have? Quote Link to comment Share on other sites More sharing options...
SupraStar Posted October 11, 2003 Author Report Share Posted October 11, 2003 Ya i guess that would help... My Bad.. Its a '91 Z34 Quote Link to comment Share on other sites More sharing options...
phantomFE3 Posted October 11, 2003 Report Share Posted October 11, 2003 2 inch, i think, someone correct me? i know i have 2" on my CS, maybe yours is 2.5"? im pretty sure its 2" but someone please verify this Quote Link to comment Share on other sites More sharing options...
Redfox340 Posted October 11, 2003 Report Share Posted October 11, 2003 Anyone know the size of the exhaust is.. After the cat specifically, if that makes a difference... On the 2.8L / 3.1L pushrods = 2" On the 3.4L DOHC's = 2.25" I would not go over 2.5" in diameter so that you won't severely lose low-end torque. - Erik Quote Link to comment Share on other sites More sharing options...
phantomFE3 Posted October 11, 2003 Report Share Posted October 11, 2003 :withstupid: listen to that, thats right, do you know why its right? because RedFox340 said it, and he says something, you know its right. well... most of the time Quote Link to comment Share on other sites More sharing options...
Aaron Posted October 11, 2003 Report Share Posted October 11, 2003 thats wrong the piping on my Z34 was 2.5", but that is a 5-speed, but i think they were the same. it was 2.5 with crush bends, i put in 2.5 with mandrel bends. mine now goes 2.5 split into 2x2.25s Quote Link to comment Share on other sites More sharing options...
Redfox340 Posted October 11, 2003 Report Share Posted October 11, 2003 thats wrong the piping on my Z34 was 2.5", but that is a 5-speed, but i think they were the same. Really? Thats cool. Hmm... however my sold Cutlass DOHC was 2.25". That's what the books called for while I was at a muffler shops installing some replacement piping. :withstupid: listen to that, thats right, do you know why its right? because RedFox340 said it, and he says something, you know its right. well... most of the time Careful, I may type something dumb... And then where would you & I be? I'm glad to know people can trust me; remember I'm not the only one that provides information on the board. All of you put in for the good of the board; pat yourselves on the back, you all deserve it. - Erik Quote Link to comment Share on other sites More sharing options...
phantomFE3 Posted October 11, 2003 Report Share Posted October 11, 2003 thats wrong the piping on my Z34 was 2.5", but that is a 5-speed, but i think they were the same. Really? Thats cool. Hmm... however my sold Cutlass DOHC was 2.25". That's what the books called for while I was at a muffler shops installing some replacement piping. :withstupid: listen to that, thats right, do you know why its right? because RedFox340 said it, and he says something, you know its right. well... most of the time Careful, I may type something dumb... And then where would you & I be? I'm glad to know people can trust me; remember I'm not the only one that provides information on the board. All of you put in for the good of the board; pat yourselves on the back, you all deserve it. - Erik haha dont worry, if i see something that you type that seems dumb to me, ill point it out, haha, and i try to give good information, but time-wise, im kindof a noob here, but ive obsorbed alot of information since i have been on board, alot of good information, still dont know what a PCV valve is/does though... :? Quote Link to comment Share on other sites More sharing options...
Redfox340 Posted October 11, 2003 Report Share Posted October 11, 2003 ...still dont know what a PCV valve is/does though... :? I thought I posted that... Wait, yeah... I did... Postive Crakcase Ventilation (PCV) System - this system is used on all vehicles to evacuate the crankcase vapors. Fresh air from the air filter / intake duct is supplied to the crankcase, mixed with blow-by gasses and then passed through the PCV valve into the intake manifold / plenum. When manifold vacuum is high, such as at idle, the valve restricts the flow of blow-off gases allowed into the manifold. If abnormal operating conditions occur, the system will aloow excessive blow-by to back flow throgh the hose into the air filter. A plugged PCV valve may cause rough idle, stalling, slow idle speed, oil leaks, oil in the air filter and carbon / sludge build-up in the intake system. Clean / replace dirty and clogged PCV valve along with inspecting the throttle body and air intake tube for oily deposits. during replacement, check any hoses for deterioration due to heat and age. - Erik Quote Link to comment Share on other sites More sharing options...
phantomFE3 Posted October 11, 2003 Report Share Posted October 11, 2003 hmm, is that the same thing as a breather? i know there is a tube leading from my air intake pipe that goes to the valvecover, and thats the breather, nothing leading to the crankcase? Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted October 11, 2003 Report Share Posted October 11, 2003 Your PCV valve is in the rear valvecover. Quote Link to comment Share on other sites More sharing options...
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