engine exhaust cfm calculator

After reading through all of the posts, I don’t think my question has been covered. I currently have a pair of rams horn exhaust manifolds feeding into two 2″ exhaust pipes running down the left side of the van. The bike put out N.A. Hello, what a great read with alot of helpful info. or 3″? Hi,and greeting from Germany! Or not. I experience power loss and increasing in fuel consumption while driving around, it just doesn’t feel right..I will be doing an engine overhaul and replace the old piston with some oversized piston soon. I’d argue they’re pretty comparable. This is the same setup that came in the hot version of my car that delivered 176 horses. Looking for Jason to weigh in on pipe diameter. It is too loud and I cannot quiet It down. Editor’s Note: The easy to read tube size charts replace our original exhaust diameter calculator for ease of use. Renato – I don’t think you’ll have to sacrifice anything in terms of power to have a relatively quite exhaust. Quick question, is the table still accurate when translated to single pipe exhaust? Shopping Cart Software by BigCommerce, Ford Roller Bearing Fuel Pump Eccentric Kit w/ ARP Pro Series Bolt, 27 SMD (81 LED) Taillight Brake Reverse Lamp LED Bulb - 1156/1157 Base, Mounting Clip for Weather Pack Wiring Connectors, Fluorescent Speedo & Gauge Needle Restoration Paint. I have heard that this setup might gain a bit of torque and produce a nicer sound. Thanks for your help. So… I am surmising that the exhaust system is a major restriction here. All the way to the tailpipe its a 2 inch. But if not, look at the chart in the article. So duels would support 11.8 liters? The car is around 175 horses at 4500 rpm. If you’re racing the 1/4 mile and you’ve got a high horsepower setup (with racing heads, cams, etc. There is really only one bend where it goes under the rear control arms so I will just weld it up from mandrel bent tubing. If you can’t do that, than the chart in the post above should tell you what you need to know. var clone = row.cloneNode(true); When fluids expand, they cool…and cold exhaust basically acts like a blockage, at least at low RPMs. **Check out our quarter mile calculator. I have a van running a 350 chev at around 300hp. If the exhaust speed falls too much, you compromise scavenging. Thx in advance. Since you’ve got forced induction, going with an over-sized exhaust isn’t a big deal…so you can just make it a little big if you want. If the temperatures are high (and I suspect that’s the case), than exhaust tubing diameter is more important than length. Also 2 magnaflow stainless steel mufflers. I’ve got a bit of an issue, as an exhaust shop installed 2″ piping on my BMW 645 4.4l V8, dual system. I have couple of questions regarding exhaust pipe sizing. This depends on the specific application and the stuffiness, … My concern is when maintain the same 3” diameter pipes further downstream will not allow for early enough conversion of exhaust exit pressure into velocity thus it could tax the engine output at lower to mid rpm range. years. Thanks. If you do the math conversion to lb/min which is 171 x .069 that = 11.799 lb/min. Gunnar – Sorry, my last comment was written so poorly it was hard to understand. I’ve ran into some problems regarding to exhaust modification lately, and I’m really in need of your helps. You can calculate the CFM (flow) required to support a motor of given horsepower. But than the heated gasses need even more. - LS1LT1 Forum : LT1, LS1, Camaro, Firebird, Trans Am, Engine Tech Forums, Remove Resonator for Intake Or Change Exhaust? But if that’s not feasible, than I’d say go with what you have. If that’s not an option, than I’d say that your upgrades should be beneficial…it would be ideal to increase the size of the tubing in the entire system, but the reality is that a) you usually can’t for one reason or another and b) most of the time, it doesn’t matter much anyways. And if I need to go smaller – will a restrictor help? The converter is destroyed and a new pipe/converter is well above 200 bucks IF i can find one at all. Thank you for your input. I have more torque now, a real strong pull in second gear, and honestly, probably 10mph higher “comfort zone” on the highway. It is much cheaper to cut the 2 down pipes and simply run 2 straight pipes all the way back. If the 3′ setup is the way to go, can you recommend a good muffler that would suit. and support the power im makeing or should i step up to 2.5 pipe? If you’re going to try a newwer pipe, I’d start with a 2.25″ and see what happens. Increasing tube size will get you more horsepower, but it won’t be quite as fun to drive on the street. It has 3 inch exhaust from the turbo back. 3) Will getting rid of the resonator increase the sound levels/interior drone? I don’t want the wrong exhaust holding me back. As for the idea that you want to neck down the x-pipes, it’s an interesting concept, but I’d guess it would have no appreciable impact. Jason, The OE muffler is a baffled 25″ long 1 1/4″ pipe. Yo i have a v6 pushing around the 500hp it red lines at 7205 and at the time i didnt know about the exhaust and apparently it has 1 1/2 pipe going down the middle and cutting off into 2 2inch pipes does that mean i need a whole new exhuast system. If I blow it up no biggie – I was planning on a new car in 1 or 2 years anyway. They’re not as close to stoichiometric efficiency as fuel injected vehicles. Ken. All I’ll say is that the OEM configuration tends to offer a good mix of low-end and mid-range performance. Which 3/8″ Cordless Ratchet Driver is the Best? Having said all of this, if the engine is mostly stock, a stock intake and exhaust will probably perform best. Your thoughts on this matter are very much appreciated! If they build your system to match the size/configuration of those systems, great. I am working on building an exhaust extension on my Toyota Corolla. R = document.getElementById("R").value; 3. When you neck down tubing (which is what happens with a collector on a header), you trade some pressure and temperature for increased velocity. It currently runs a single 3 inch pipe from front to back with a flowmaster 40 series. If I cannot get mandrel bends would I just size up a quarter inch on each pipe to counter the efficiency loss? HiPo Parts is not responsible for errors made based on the use of these calculators. What piping would you suggest is optimal for my car 2.25″ or 2.5″? This will override the room type. (318 with comp cam (rv) 4 barrel eddy 600cfm and eddy intake with hooked headers) If you put a 3″ exhaust on, you’ll lose some top end, but it will be great off the line. It’s easier to work around, and it requires less components. Down pipes with primary Cats are 3” in/out. Also, keep in mind that with turbocharging, exhaust tube size isn’t nearly as important as it is on naturally aspirated engines. Any thoughts on downpipe and exhaust sizing please? But I can’t find anyone locally to San Jose CA area that does Mandrel bends. Good article and chart. Should I run 3″ from the header to what I have added? This is because exhaust gas velocity is better in smaller exhaust tubing at lower RPMs. output = "The required CFM is between " + a2 + " and " + a1;

If i bought a manzo catback exhuast system with 2 1/4 pipeing fit my 2 inch obx header or does it even make a difference, please contact my email with replys. Mike – You’re right – I’ve got it backwards. Raneet – You don’t need the ‘expansion can’, (which I assume is a resonator or muffler) because the gases have cooled quite a bit by the time they get to the end of the system. var table = document.getElementById("all"); Corey – A couple of 2″ exit pipes dumping into 2.25″ pipes isn’t too far off the “ideal” size in our chart. This is a street legal NOT race car that will be driven quite often but obviously with that much power there will be that need to stomp it occationally. It might even be a bit too big. The small engines are super-sensitive to exhaust changes. I bought a Magnaflow TruX Dual In/Out Muffler 2.25″ to act as the X-Pipe Muffler and two Dynomax Super Turbo 17733 2.5″ mufflers. Do you think this is because a loss of back pressure? How To Troubleshoot and Fix Common Plasma Cutter Problems, How To Chop a 1947 Buick Sedanette in Two Minutes, Wheelbase Measurements for Popular Classic Cars, Engine / Transmission / Chassis Donor Search, Project Cars and Part Donor Cars For Sale. Quickly, my question’s for a 302 (Low end cam/600 carb) in a ’65 Fastback on its way to Germany to sell one day. I’d ask on a BMC bike forum.

for (var i = 0, row; row = table.rows[i]; i++) { Notify me of followup comments via e-mail. Fill in the fields below (example: 5000 RPM), click calculate, and we’ll show you the optimal cfm for the street and track! I’m looking at keeping the front section as it is and where the two pipes come together on the left side behind the transmission, mate the two into a single 3′ pipe, into a single muffler then carry the 3′ pipe out to the back of the van. You could certainly try a larger downpipe to see what happens…I don’t think it would make any difference at all, but there’s one way to know for sure. It’s a V6, and a set of duals that big is big enough for a high horsepower V8…, the table shows a pipe with a 2″ diameter as having an If you’ve got it tuned and it’s putting out 400hp, on the other hand, 2.5″ is reasonable. Can I go any bigger? We apologize for the added step and appreciate your understanding! James – 3″ downpipe sounds pretty big. I loved reading the comments on here. thanks for your time and expert opinion in advance. I wondering if I should just go with 2.5″ and call it a day. It comes out of the manifold as a 2″ but can I drop that to 13/4″ or even 11/2″ from under the car to the rear or is that too small? This calculator is designed to give the engine's air intake volume requirements. The chart/info supplied helped me choose the 2.5″ single pipe. So here is an example: Let us assume we have a motor making 400 flywheel horsepower and we'd like a single pipe exhaust. As for the idea of a necked down tube creating a venturi, my guess is that it would be a net negative. This size work on the supercharged engine too? The engine need flesh air to burn fuel. 4)Any benefits if the after-market muffler has 2 exits vs 1 exit? The question of what pipe size is better is over and over asked in the forums and most of the people say that the dyno proves that 3″ is better. Can’t imagine it needs that much flow. I’m wondering if I change it, if I should go bigger. My advice is to install mandrel-bent tubing if at all possible, even if you have to order it online.

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