ESE's works engine tuner

**andreas** · 26th November 2019, 05:08

Originally Posted by husaberg

these albums

No , page suggests to mind my business.

**jbiplane** · 26th November 2019, 05:34

Almost ready ECU. Missed on-board MAP sensor (delivery delay)

**monkeyfumi** · 26th November 2019, 09:55

Originally Posted by husaberg

these albums

If I click the links in your post, I can see the albums. But if I click the same links in Frits' quoted reply, then they don't work.

**husaberg** · 26th November 2019, 16:36

Originally Posted by Frits Overmars

Not much joy there, Husa. I couldn't access those albums back in 2014, and I still can't.
Attachment 343714

odd they work for me but not for your replied quote?

Originally Posted by andreas

No , page suggests to mind my business.

**andreas** · 26th November 2019, 17:02

Originally Posted by husaberg

It's working and jolly.

**Frits Overmars** · 27th November 2019, 00:30

Originally Posted by husaberg

these should work.

They do!

Originally Posted by husaberg

Right there is 100 odd albums in there
https://www.kiwibiker.co.nz/forums/album.php?u=28036
As Frits suggested i will be putting them likely into a cloud based file

But keep them on your own hard disk as well. Remember:

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**husaberg** · 27th November 2019, 06:19

Originally Posted by Frits Overmars

They do!

But keep them on your own hard disk as well. Remember:

I had them and heaps more on an external drive that failed.
So i can see what you are saying.

**Lef16** · 2nd December 2019, 06:18

Hi,
It has probably been discused here before,but I can't help my self from asking,so here it is.
What's the effect of a steeper angle in header?
Lets assume that we have an engine,and 2 almost identical exhaust pipes,2 headers at 32% as wobbly said,but one header has 3* angle and the second one has 3.5 or 4*,who is it going to affect power and power curve?
Question number 2:
Lets again assume we have 2 exhaust pipes,same header,same TL,same belly dia,but different diffuser angles,lets say in first pipe all 3 angles are close,but in the second one they are more "spread",with the first been the more shallow and the final diff been the steepest,how each one is going to perform?Who will the 2 differend diffusers spread the power?
Here's an example,because I don't know if I made my point clear(english language is not my strongest point

)

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PS:I know that probably it's been discused before,somewhere in these 2200+ pages,but I dont seem to find it,no matter what.So if someone has the link that I miss,share it

,if not I would really like to hear some opinions,especially from wob or frits!

**wobbly** · 2nd December 2019, 07:28

Engines respond differently to diffuser and header angles , but a few points for you to note.
If you have a 75% nozzle on the cylinder exit ( you haven't ) try dividing the header in 1/2 and running 3.2/5.2*.
Having a longer and steeper last diffuser leading up to the belly adds power on the front side approaching peak. A steeper 1st diffuser adds power after peak.
These designs are based on the old Honda published A kit info , they need a fatter belly diameter ( 125 at least ) and a steeper rear cone to go with that.
The good thing is you can try all this easily in EngMod and rely on the results as long as the rest of the project inputs are real.

**TZ350** · 2nd December 2019, 13:02

Originally Posted by Lef16

I know that probably it's been discused before,somewhere in these 2200+ pages,but I dont seem to find it,no matter what.So if someone has the link that I miss,share it

,if not I would really like to hear some opinions,especially from wob or frits!

Hi Lef16 I used this search:-

header cone angles site:https://www.kiwibiker.co.nz/forums/s...s-engine-tuner

just copy and paste that line into Google to find a lot of references to pipe and header cone angles.

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The Google "site:" term before the KiwiBiker ESE threads web address is the way to find what you are looking for.

Wobbly and Frits have posted so much info about pipe design on the ESE thread that it is now a total gold mine of expert info on pipes.

**andreas** · 2nd December 2019, 23:00

Originally Posted by Lef16

Hi,
It has probably been discused here before,but I can't help my self from asking,so here it is.
What's the effect of a steeper angle in header?
Lets assume that we have an engine,and 2 almost identical exhaust pipes,2 headers at 32% as wobbly said,but one header has 3* angle and the second one has 3.5 or 4*,who is it going to affect power and power curve?
Question number 2:
Lets again assume we have 2 exhaust pipes,same header,same TL,same belly dia,but different diffuser angles,lets say in first pipe all 3 angles are close,but in the second one they are more "spread",with the first been the more shallow and the final diff been the steepest,how each one is going to perform?Who will the 2 differend diffusers spread the power?
Here's an example,because I don't know if I made my point clear(english language is not my strongest point

)

PS:I know that probably it's been discused before,somewhere in these 2200+ pages,but I dont seem to find it,no matter what.So if someone has the link that I miss,share it

,if not I would really like to hear some opinions,especially from wob or frits!

Diffuser "horn coefficient" is the word you're looking for.

**andreas** · 3rd December 2019, 03:45

I read a few places about the negative effects of fitting large diffusers to old style transfer design, it resulting in 'over scavenging' assuming charge is drawn to far or contamineted to be pushed back. And the villain should be poor tr duct design and not enough backward angling -but suction wave should not create any directed flow from the ducts, perhaps more eddying at most? The reason is rather the crank volume being to small to feed the greater wave?

**lohring** · 3rd December 2019, 06:03

With the few pipes I've built, I found that a relatively low horn coefficient (1.2) gave the best peak power. A little higher horn coefficient (1.4) worked better on a stock, piston ported engine with a relatively restricted intake port and transfers. Modifications to the intake and transfer width and timing eliminated this advantage.

Lohring Miller

**andreas** · 3rd December 2019, 17:32

I agree with that, makes me think advancing the diffuser might be a possibility.

**wobbly** · 4th December 2019, 07:11

You can move the diffuser forward to increase the negative pressure ratio sooner around BDC.
This helps overev power - offset by the increase in front side by the steep last diffuser angle.
Here is the new homologation R1 pipe for TM done in EngMod.

Edited - wrong final pipe design

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