Golden Eagle Stroker Kit question.

B16, B18, B20
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By Greasedmonkey
- Mon Aug 16, 2010 5:44 am #209105 The answer to that is the bends in the piping. Generic Exhaust shops dont mandrel bend the piping. THe bolt on cat backs are mandrel bent.
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By 93hatcheg
- Mon Aug 16, 2010 4:19 pm #209154 Basically it means there a ripples in the metal at the bend where mandrel bent is a smooth bend the entire way,

I just don't see how the ripples can make a noticible difference in hp
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By That One Dude
- Tue Aug 17, 2010 4:03 am #209247 Crinkle bent is the term. It's extremely restrictive as opposed to mandrel bent.

The mandrel bent tubing typically holds the true round form all the way through the bend to an extent. It's not going to be absolutely perfect without filling the tubing with sand, but who's going to take the time to fill it with sand?

Crinkle bent tubing is literally crinkle bent. Sometimes refered to crush bending because it looks like the tube is being crushed into shape. The diameter of the tube in the bend is almost cut in half depending on the original size of the tubing.

Exhaust streams must be smooth in order to make the full available power increase. If there is a flaw or disruption in the airflow, there will be turbulence that ultimately causes the airflow to slow down.

Same thing goes for the intake. The reason why Skunk2 manifolds are such good performers is the careful design of the runner crossection, the blending of the plenum into the runner mouths, and the blending of the inlet into the plenum. And the reason why the VictorX manifold doesn't perform as well as the Skunk2 manifold is because of the gigantic plenum in comparison. You lose a huge amount of throttle response in an NA engine utilizing the victorX manifold and therefore ultimately the engine doesn't make as much power.

Hope that helps.
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By poorman type-r
- Tue Aug 17, 2010 11:13 am #209279 Wow i feel pretty dumb compared to all of you lol. But that does make sense, so it would definitely be worth spending the money on a brand name exhaust system instead of just welding an exhaust pipe together myself?
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By That One Dude
- Tue Aug 17, 2010 7:09 pm #209347 I had a buddy weld mine up for me. $250 for materials $100 muffler, $150 for tubing), $250 for labor. Not a bad deal for a custom 2.5" mandrel bent exhaust system. But you can get a good name brand for the same price I paid.

Most of my knowledge on Hondas comes from reading. And the majority of my knowledge on airflow comes from my fascination with aviation.
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By Greasedmonkey
- Wed Aug 18, 2010 5:08 am #209428 It will be better with a brand name one yes. KTeller makes bolt on kits with mandrel piping for rather cheap, just have to pick your muffler.

Thats what I will be replacing mine with.
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By poorman type-r
- Wed Aug 18, 2010 8:12 am #209442 Well i try and read up a lot but there are so many different opinions from people its hard to know who is right in some forums. Now im guessing all aftermarket exhaust comes with the manderal piping? If i had about 600 to spend on a full exhaust, which would you guys prefer?
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By 93hatcheg
- Thu Aug 19, 2010 6:49 am #209575 Well my opinion on the entire thing is that its a lil overated. I mean I don't think that the exhaust system is going to increase the hp enough to justify a 600 dollar bill. I mean for 600 bones you could put a lot more benificial parts into the motor that would make noticible power.

I mean I have never drove a car one way and then had a full exhaust put in it (mandrel bent or not) and then hopped into it and noticed a hige different. Nothing that made me go ohh shit that's crazy

Has anyone taken a stock motor dyno tuned it and then dyno'd it after a full exhaust? I don't think it woulf be a big difference. Every thing I have ever heard is that exhaust and intake just free up the motor they don't produce big power gains. Could a exhaust system really produce more than 10-15Whp?

Not trying to argue but I don't believe that a exhaust system can make that big of a difference withought proof. On top of that the silly little crush bends I mean can that really lose you more than 2whp? I doubt it, and 2whp isn't noticible by a driver in a car. But if someone can show me proof that exhaust will make a difference worth that much trouble then show me. I'm down for learning stuff I just need proof.
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By Greasedmonkey
- Thu Aug 19, 2010 11:28 pm #209699 YOu can believe me or not. Im not going to go out of my way now to find proof for you. Its been noted many times that the exhaust does matter. Size, length and flow characteristic all server their part in making a exhuast system make power instead of taking it.

Ive posted up a few times about a company that makes a kit that is not $600. I guess you missed that part.
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By poorman type-r
- Fri Aug 20, 2010 2:08 am #209727 Well on a side note i think this was a pretty good forum that lasted longer than two questions lol.
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By 93hatcheg
- Fri Aug 20, 2010 3:58 am #209743 I agree with you that yes all those parts do make a difference but on a 4 banger I doubt anyone can hop in there car and feel a performance difference from the type of tubing they have. And as hackyjon ( sorry I'm on my blackberry I can't scroll to find his real screen name sorry man) when yo go to to a 2.5 exhaust t backpressure is outta the question so how can the ripples be highly restrictive? No need to get upset just debating my understandin.

Honestly how much hp increase do you think a exhasut system will give yo?u
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By Greasedmonkey
- Fri Aug 20, 2010 10:39 pm #209852 The increase depends on the motor itself. A high comp motor with great cams and an awesome tune can see very nice gains going from stock or cimp bent to a nice mandrel bend set up.


YOu have to remember, that you might have told them 2.5" piping when you went to the exhaust shop, but the crimping/crinkle bending method will make it more along the lines of 1.5 or so.
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By 93hatcheg
- Sun Aug 22, 2010 3:01 pm #210040 Ooook see no we are learning and putting rrasoning to all these accusations. So from what your saying is the crimping compresses the tubung size so a non-mandrel exhaust will be 2.5 everywhere but smaller in the bends? If so then I can see that being a power loss. And on a nice built motor I couls see that making a difference. But I just thing there would be much difference between the 2 systems on a stock car. Good. Info to know tho :)
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