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Guest Message by DevFuse
 

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EA81 exhaust... so this happened...


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11 replies to this topic

#1 Knucklehead Saloon

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Posted 07 December 2017 - 03:11 AM

Custom built to my design.

1.75" unequal length headers into a 2" system.

Sounds awesome and makes power !
Attached File  exhaust1.jpg   140.59K   54 downloads
Attached File  exhaust2.jpg   182.16K   57 downloads

#2 bratman2

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Posted 07 December 2017 - 08:08 AM

Nice looking header! You weld that up yourself?



#3 Knucklehead Saloon

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Posted 07 December 2017 - 12:55 PM

Nope. Unfortunately my welding skills are nowhere near as good as that. Found a small exhaust shop that builds custom stuff and gave them a picture I drew the week before.

I knew I was in the right place as soon as I walked into the shop. They had a wrx on the hoist and 3 harleys parked in there.

These guys:

Rutherford Muffler & Suspension & CV's

35 John St
Rutherford, NSW, 2320
Phone No:
0249324775

#4 dfoyl

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Posted 08 December 2017 - 01:30 AM

Uneven length headers don't make more power than equal length, they are less efficient.



#5 Knucklehead Saloon

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Posted 08 December 2017 - 04:38 AM

Unequal don't make more outright power true. However every dyno print I've seen says they drop 3 or 4hp up top and gain a fatter midrange TQ (where I do most of my driving).
Added bonus is they sound wayyyyy better.

#6 Loyale 2.7 Turbo

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Posted 08 December 2017 - 08:47 AM

... Added bonus is they sound wayyyyy better.

 

That's True. Share a video with us, so we can hear it  :) 

 

That is one of the Cleanest exhaust jobs I've seen.

 

Kind Regards.



#7 iceageg

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Posted 08 December 2017 - 09:16 AM

Unequal don't make more outright power true. However every dyno print I've seen says they drop 3 or 4hp up top and gain a fatter midrange TQ (where I do most of my driving).
Added bonus is they sound wayyyyy better.

Different benefits and drawbacks, usually decided by space constraints.  In a nutshell, would the extra routing and twists needed to fit equal length headers end up less efficient than unequal length for a specific application.  It's usually not an issue but there are still plenty of examples if you go looking for them.

 

Mercedes has done some unequal length headers in their cars in the past.  Talking outright power, their 2015 F1 cars had unequal length headers and dominated that season.  Mercedes also did some strange stuff with them way back in the day on airplane engines like having slightly different compression ratios on the left/right cylinder banks to account for the different exhaust efficiency on each side.  You can also find them on high end sport bikes like some years of the Aprillia RV series.  Of course you can't ignore the obvious example of how well they have worked on Subaru's for so many years.

 

Bottom line is companies with huge R&D staffs full of brilliant engineers have proven that unequal length headers can be a better and more efficient choice in certain applications.  Equal length certainly have more power potential but that is not always true when considered as part of an entire chassis design.  Besides, as you pointed out they always sound better on 4 cylinder engines and that counts for something too.  Glad to hear you are happy with your result.



#8 Knucklehead Saloon

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Posted 08 December 2017 - 12:31 PM

I'll try and shoot a vid in the next couple of days (its flogging rain here at the moment).

I reckon it sounds awesome, especially around 2000 rpm... gets this real fat throb to it..(no the exhaust not my pants haha).

#9 jono

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Posted 09 December 2017 - 03:36 AM

I give you credit for chasing torque!

Who drives around on the HP max mark anyway?

Just look at the Aus Ford 4.0 litre I6 with flat torque line between 2000 and 4000 rpm was it?

#10 Loyale 2.7 Turbo

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Posted 09 December 2017 - 09:05 PM

Sorry for the offtopicness, but regarding this:

 

... Just look at the Aus Ford 4.0 litre I6 with flat torque line between 2000 and 4000 rpm was it?

 

Are you writing about the same in-line six cylinder Ford engine, that you have one, and also I have another one? ... If so, it is a 4.1 (250 cui) litre, not a 4.0 litre, and I didn't know, nor ever noticed that.

 

By the way, the one I have, came from factory with an unequal exhaust manifold, that fooled people, making them believe that it was a V8 somehow... sadly that unequal exhaust manifold is long gone, as it developed a Hole in front of the cylinder #1 which never got welded in a long lasting way, every welding only lasted around a week, so my dad changed it with a straight exhaust manifold from a 300, that makes the car to sound -and feel- way softer...

Kind Regards.



#11 jono

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Posted 10 December 2017 - 12:27 AM

Sadly no longer have the beast. And reference is to the ohc 4.0 that started production about 1989 and just continued to evolve.

#12 Knucklehead Saloon

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Posted Yesterday, 02:20 AM

Heres the vid !!

https://youtu.be/d84k-CNNzws




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