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Forum: The Unicorn Corral 04-15-2015, 11:12 PM
Replies: 140
Views: 24,119
Posted By oil pan 4
This guy owns hho believers like a boss. (from...

This guy owns hho believers like a boss.
(from the CR4 link)

"A while ago, in a post in one of our too-frequent over-unity threads, I wrote about having a lot of respect for science, scientists,...
Forum: The Unicorn Corral 04-15-2015, 02:32 AM
Replies: 140
Views: 24,119
Posted By RedDevil
We can discuss till the cows come home, or just...

We can discuss till the cows come home, or just watch how others do the hard work for us...
Searching for oxyhydrogen dyno tests I found this thread on CR4...
Forum: EcoModding Central 03-24-2015, 12:40 PM
Replies: 19
Views: 10,758
Posted By NeilBlanchard
I am now working full time, and CarBEN is still...

I am now working full time, and CarBEN is still moving, but I have to build an addition on my garage to continue. SketchUp models are holey and mine is no exception. We have tried CFD on it, and it...
Forum: Aerodynamics 03-18-2015, 11:35 PM
Replies: 4,279
Views: 1,422,343
Posted By freebeard
http://files.conceptcarz.com/img/Horch/37-Horch-85...

http://files.conceptcarz.com/img/Horch/37-Horch-853-Voll-DV-09_PBC_dt02.jpg
This is the pre-war luxury car appreciation thread....
Forum: Aerodynamics 03-12-2015, 03:39 AM
Replies: 4,279
Views: 1,422,343
Posted By freebeard
Yay for Jocko Johnson! Here's the Special from...

Yay for Jocko Johnson! Here's the Special from Permalink#1050 (http://ecomodder.com/forum/showthread.php/interesting-aerodynamic-cars-mike-vetters-etv-also-avion-11732-105.html#post409085):...
Forum: Aerodynamics 03-10-2015, 05:38 PM
Replies: 4,279
Views: 1,422,343
Posted By aerohead
Hudson

When Professor Kamm was working in the USA,the Hudson was his only 'BUY' recommendation for friends and associates.
If you have 'A Method of Estimating Drag Coefficients',by R.G.S.White,of...
Forum: Aerodynamics 02-26-2015, 10:13 PM
Replies: 4,279
Views: 1,422,343
Posted By redneck
. 1925 Rolls Royce Phantom I Jonckheere...

.

1925 Rolls Royce Phantom I Jonckheere Aerodynamic Coupe

http://i536.photobucket.com/albums/ff325/dmt6969/4181424910453_zpsgpwbvqsm.jpg...
Forum: Aerodynamics 02-18-2015, 05:58 PM
Replies: 83
Views: 22,007
Posted By aerohead
optics

An exterior, body-hugging, fresnel lens objective with internal view-screen was promoted 20-years or so ago as a drag reducing replacement for conventional side-view mirrors.I've never seen nor heard...
Forum: Aerodynamics 12-18-2014, 06:08 PM
Replies: 50
Views: 10,528
Posted By aerohead
double-box

It's just my opinion,but I think all three would have a shot at drag reduction.
You've got this large turbulent wake
http://i1271.photobucket.com/albums/jj622/aerohead2/12-061.jpg...
Forum: EcoModding Central 12-16-2014, 10:15 AM
Replies: 100
Views: 27,878
Posted By Nigel_S
I managed to draw this graph showing %torque...

I managed to draw this graph showing %torque increase of my tri-Y header over the standard header with pre-cat in the manifold just by timing the cars acceleration to each 250rpm over a few runs...
Forum: EcoModding Central 12-14-2014, 07:28 PM
Replies: 100
Views: 27,878
Posted By freebeard
Can you put a date to "Motoman"? Because until I...

Can you put a date to "Motoman"? Because until I hear that, I'd go with Jocko Johnson, Zora Arcos-Duntov, and that guy I can't remember that did head porting in California in the 50s.

HotVWs...
Forum: EcoModding Central 12-12-2014, 08:57 PM
Replies: 100
Views: 27,878
Posted By freethink
My ebay header primaries measure 1.66" or 42mm. ...

My ebay header primaries measure 1.66" or 42mm.

Let me clarify the purpose of 'ram horn' headers
1) to make the primaries equal in length. Again, this gives best peak power, but reduced low-end...
Forum: EcoModding Central 12-11-2014, 05:52 PM
Replies: 100
Views: 27,878
Posted By Nigel_S
The angle the pipes join in the Y pieces is rpm...

The angle the pipes join in the Y pieces is rpm dependent with Formula 1 exhausts having an unbelievably high angle, so for low rpm with long exhaust pulses you will want a very shallow angle.
Forum: EcoModding Central 12-11-2014, 04:31 PM
Replies: 100
Views: 27,878
Posted By ultimx
I was waiting for someone to post bisi motos...

I was waiting for someone to post bisi motos header. A main point to also think about is a good collector design. Burns stainless which I believe Neal posted comes to mind since u like tigging. Also...
Forum: Aerodynamics 12-06-2014, 04:57 PM
Replies: 50
Views: 10,528
Posted By freebeard
Rotating cylinders? Could you use a rotating...

Rotating cylinders? Could you use a rotating cylinder at the stagnation point to effectively move it to ground level?
Forum: EcoModding Central 11-24-2014, 08:26 PM
Replies: 100
Views: 27,878
Posted By Nigel_S
Not sure how much you know about flex pipes but...

Not sure how much you know about flex pipes but some advice if you don't know:

If you have the room then I suggest a 6" one, I fitted a 6" to mine and it's a nice length, gives decent flexibility...
Forum: EcoModding Central 11-24-2014, 05:28 AM
Replies: 100
Views: 27,878
Posted By freebeard
Your '“k-tuned” headers' link needs touching up. ...

Your '“k-tuned” headers' link needs touching up.

This all sounds reasonable, 4-2-1 would definitely be the way to go. Except I would think the exhaust port should be matched. A round pipe on an...
Forum: EcoModding Central 11-23-2014, 07:10 AM
Replies: 100
Views: 27,878
Posted By Nigel_S
I realised that you didn't mean a real explosion,...

I realised that you didn't mean a real explosion, but still, it doesn't help to think about it in that way because it should operate smoothly,

The flow in the pipe should not be turbulent, maybe...
Forum: EcoModding Central 11-22-2014, 03:40 AM
Replies: 100
Views: 27,878
Posted By Nigel_S
A 5% increase in fuel pressure gives a very small...

A 5% increase in fuel pressure gives a very small increase in flow, not a 5% increase - look up the theory or an online calculator. If you need more than a few % extra fuel then consider swapping...
Forum: EcoModding Central 11-21-2014, 02:02 PM
Replies: 100
Views: 27,878
Posted By ever_green
any non-detonating engine would make more power...

any non-detonating engine would make more power than a detonating one. plus sometimes its good to reduce VE a little to run more timing. hot rodders sometimes run less compression pistons to run more...
Forum: EcoModding Central 11-21-2014, 04:35 AM
Replies: 100
Views: 27,878
Posted By Nigel_S
That is because most engines don't run closed...

That is because most engines don't run closed loop at full throttle, they use open loop and guess the amount of fuel to inject based on the throttle position sensor and either a manifold pressure...
Forum: EcoModding Central 11-20-2014, 05:30 PM
Replies: 100
Views: 27,878
Posted By ever_green
I switched from a 4-2-1 catted equal length...

I switched from a 4-2-1 catted equal length header to 4-2-1 unequal shorter headers and my mileage actually increased. This might be because i could run hella lot more timing at lower RPMs than...
Forum: EcoModding Central 11-20-2014, 04:43 PM
Replies: 100
Views: 27,878
Posted By gone-ot
Maybe "trombone" exhaust header pipes, using...

Maybe "trombone" exhaust header pipes, using sliding joints? At least for prototype testing?

Earlier postings:

•...
Forum: EcoModding Central 11-20-2014, 02:30 PM
Replies: 100
Views: 27,878
Posted By kafer65
Haven't they used thermal imaging to see hot...

Haven't they used thermal imaging to see hot spots developed from the harmonics to choose where to put the crosspipes? That might help confirm if you're on to a good setup.
Forum: EcoModding Central 11-20-2014, 11:05 AM
Replies: 100
Views: 27,878
Posted By adam728
If you are going to venture into header design,...

If you are going to venture into header design, do yourself a favor and purchase Pipe Max ( PipeMax36xp2 (http://maxracesoftware.com/pipemax36xp2.htm) ). I am unaffiliated, but it is highly regarded...
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