Replacing entire exhaust on a C3



Replacing entire exhaust on a C3

Postby chromebumpers » June 10th, 2013, 10:22 am

Time to start putting the parts on 72 that has been sitting for so long. I'm replacing the stock exhaust 2" with 2.5" factory style pipe, taking off the heat-riser in the process. Mangaflow mufflers as an upgrade from stock and new stainless steel hardware. My question is: I see some guys use some sort of"paste" on the junction areas of the exhaust pipes and mufflers. Will standard clamps do for a gas tight fit or should I take the extra step and use some sort of sealant?
Rich
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Re: Replacing entire exhaust on a C3

Postby grumpyvette » June 10th, 2013, 1:05 pm

using some sealant on a non visible area on an exhaust that's likely to look like crap,is rather pointless in my opinion when you can weld it solid or use clamps designed for the job.
once more its a huge advantage to have access to a decent welder, a GOOD MIG is adequate, a good TIG is IDEAL
obviously if you might need to remove the exhaust to get access to some drive train component like when your occasionally replacing a clutch, you'll want to use clamps so you can remove the exhaust if required, to maintain access , but if thats not required weld the pipe


http://www.welders-direct.com/mm5/merch ... ry_Code=MW
a welder like this with the correct accessories can do 95% of anything required when dealing with the steel parts on most cars

http://www.summitracing.com/parts/wlk-3 ... 7AodbEEAqQ

viewtopic.php?f=56&t=1166

viewtopic.php?f=56&t=1166&p=30424&hilit=exhaust+tools#p30424

viewtopic.php?f=60&t=1283

http://www.popularhotrodding.com/engine ... 505em_exh/

viewtopic.php?f=60&t=7794

viewtopic.php?f=80&t=7323&p=24881&hilit=side+pipes#p24881

viewtopic.php?f=60&t=1594

viewtopic.php?f=56&t=7806&p=26776&hilit=corvette+exhaust#p26776

http://www.youtube.com/watch?v=JohBHzhOyPg
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IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!
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Re: Replacing entire exhaust on a C3

Postby grumpyvette » August 14th, 2013, 1:51 pm

KacyC3 wrote: can, I install a c4 exhaust on a c3 corvette? The reason I asked is I found this article
http://www.popularhotrodding.com/enginemasters/articles/hardcore/0505em_exh/
And what it would take to duplicate the results and parts used



if you have the required fabrication skills and a decent welder, and a few tools and you don,t mind cutting and welding you can make darn near anything in an exhaust system fit on a c3 corvette, but I doubt it will be a bolt in deal, I doubt youll find it worth the effort , rather than just getting the correct parts
the ideal exhaust on any corvette will have less than 1 psi of back pressure at peak power rpms and headers designed to match the engines power curve.
In most cases commercial headers are designed to be easy to manufacture, cheap to produce and simple to install with very little thought wasted on maximizing power or designing a header that maximizes the engine torque in its usually power band.
Id point out that a c3 corvette has a cross member that in UN-modified for restricts an under the car exhaust that routes thru that cross member to about a 2.5" diam pipe size but if you can fabricate thats hardly a huge problem to over come, and you do have the option of a side exhaust

viewtopic.php?f=56&t=7831&p=26979&hilit=side+pipes#p26979

viewtopic.php?f=80&t=7323&p=24881&hilit=side+pipes#p24881

viewtopic.php?f=56&t=2350&p=12388&hilit=side+pipes#p12388

viewtopic.php?f=80&t=7323&p=24881&hilit=side+pipes#p24881

viewtopic.php?f=56&t=9296&p=33590#p33590

VIDEO SIDE PIPES HOOKER INSERTS VS SPIRO INSERTS

https://www.youtube.com/watch?v=RhxjCs9msq4

keep in mind the OEM engineers are more concerned with low noise levels and maximizing power in the idle to 3500 rpm band where most cars operate 90% of the time.
upgrading to a dual 3" exhaust with an (X) pipe and low restriction mufflers matched to headers calculated to match your intended power band could easily boost net power 30 plus hp
Here are some numbers assuming exhaust behaves as an ideal gas and the pressure inside an exhaust system is 1 atmosphere due to it having an open end.


degrees F-------gas volume (1 mol)
100F-------------25.51L
300F-------------34.63L
600F-------------48.32L

Exhaust gasses at 600F are almost double the volume as they cool and reach the tailpipe. If exhaust efficiency is to keep velocity constant, wouldn't it not make sense to keep the relative diameter of the pipe consistent with temperature of the exhaust in the system?
Why aren't racing exhausts pipes tapered to maintain this difference in volume?
WELL ONE REASON is that on a race engine the whole exhaust length is not used or needed to maximize low rpm torque, and at higher rpms a tuned header collector more closely matches the intended power curve, thus as long as the exhaust is LESS restrictive past the header collector its not hurting the power curve, so its maintained at the collector exit diameter , or routed to a (X) pipe to further reduce the restriction, remember the exhaust is in pulsed spaced 90 degrees apart not a solid consistent flow.


READ THIS THREAD AND SUB LINKS

viewtopic.php?f=56&t=1503

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TAKE the effort to calculate what the correct type/size headers will be

http://www.wallaceracing.com/header_length.php

http://www.pontiacracing.net/js_header_length1.htm

http://www.bgsoflex.com/cgi-bin/progaut ... 3&rpm=6300.

http://www.mk5cortinaestate.co.uk/calculator5.php



threads and sub links you should read thru
viewtopic.php?f=56&t=495

viewtopic.php?f=56&t=1166

viewtopic.php?f=56&t=1503&p=8318&hilit=side+pipes#p8318

viewtopic.php?f=56&t=961

viewtopic.php?f=56&t=185

viewtopic.php?f=56&t=2916

viewtopic.php?f=56&t=1730&p=5392&hilit=header+test#p5392

viewtopic.php?f=56&t=3529

viewtopic.php?f=56&t=961&p=1716&hilit=side+pipes#p1716
IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!
grumpyvette

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