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Old 28 Nov 2007, 13:24 (Ref:2077295)   #1
knighty
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knighty should be qualifying in the top 10 on the gridknighty should be qualifying in the top 10 on the grid
Grooved cylinder heads

check this link out

http://somender-singh.com/content/view/7/31/

and this one

http://www.gofastnews.com/board/engi...9.html#post552

looks like a nice little cheap tuning modification for 2 valve per cylinder engines
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Old 28 Nov 2007, 16:33 (Ref:2077430)   #2
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Alex Hodgkinson should be qualifying in the top 10 on the grid
Crikey they look a bit unsitely don't they! Seems like it could be a worker though. Not too sure about it myself. I can think of nicer ways which would have the same effect.
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Old 28 Nov 2007, 17:59 (Ref:2077484)   #3
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Looks like one of Zef's modded heads after a night in the pub !
I'd like to see some "real" back to back tests on this one.
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Old 29 Nov 2007, 08:07 (Ref:2077798)   #4
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knighty should be qualifying in the top 10 on the gridknighty should be qualifying in the top 10 on the grid
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Originally Posted by GORDON STREETER
Looks like one of Zef's modded heads after a night in the pub !
I'd like to see some "real" back to back tests on this one.
you want real back-to-back results, here you go

http://somender-singh.com/content/section/4/37/

scroll down, if the page is blank
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Old 29 Nov 2007, 08:50 (Ref:2077830)   #5
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His site doesn't help much. There's a lot of 'seems to do this' and 'we think' that.. Smells a lot like snake oil or tiger repellant

However, it does link in with an idea I had a while back but just don't have the resources to follow up on - tapered squish pads. I thought about tapering the squish areas in towards the valves slightly - thought it may direct more of the mixture towards the plugs under compression, and help spread the flame front a bit wider. I'm probably wrong in several ways
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Old 29 Nov 2007, 15:10 (Ref:2078008)   #6
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knighty should be qualifying in the top 10 on the gridknighty should be qualifying in the top 10 on the grid
snake oil.......one bloke has tried it on his briggs and stratton lawn mower engine via hacking a groove with a 1/4 inch file, and reported it now uses a 1/4 of the fuel and idles much better ........surely thats a credible enough thread for all us and all big motor manufacturers to jump on board!.........but joking aside, if someone like briggs and stratton said "yep, we''ll have it" you can have 10 cents royalty per engine, he will be a very very rich man........their engine production volumes are well into the millions.

but seriously, I think he has something, it seems to work better on some engines and not so well on others, main benefit is improved idle behaviour and emissions.......with small improvements in mid-range and max power.......I think its best suited to high compression race engines with big piston intruders that mask the other side of the chamber.

it would be interesting to see how it would perform on a highly strung 2-valve motor like a nascar engine........we shall see
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Old 29 Nov 2007, 15:43 (Ref:2078036)   #7
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AU N EGL should be qualifying in the top 10 on the gridAU N EGL should be qualifying in the top 10 on the grid
Its a FORD engine . . . They need all the help they can get.



Just Kidding . . . .
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Old 30 Nov 2007, 22:13 (Ref:2079060)   #8
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THR has a lot of promise if they can keep it on the circuit!
sounds logical really... no proof above tho, its an extra op to machine in an engine, hence costs more to make, hence manufacturers aint done it!
F1 engines must have this sort of technology already, it would be something that they do all the time, esp with the camera in engine video.
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Old 3 Dec 2007, 00:25 (Ref:2080215)   #9
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Notso Swift should be qualifying in the top 10 on the grid
4 valve motors don't have the same issues with swirl and flame path and all that
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Old 3 Dec 2007, 00:59 (Ref:2080223)   #10
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kelvin88 should be qualifying in the top 10 on the grid
Surely NASCAR teams has tried this already?
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Old 3 Dec 2007, 01:09 (Ref:2080230)   #11
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gttouring should be qualifying in the top 10 on the grid
if this was really this great, pay for the patent use would have been done by any and all manufacturers- it is such a simple idea and easy to do why not..then testing all the shapes of grooves and number of cut..hmm hmm
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Old 3 Dec 2007, 08:42 (Ref:2080453)   #12
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phoenix should be qualifying in the top 5 on the gridphoenix should be qualifying in the top 5 on the grid
I can see how it might achieve the claimed results.

With a two valve head and an offset spark plug, squirting a high-speed jet of mixture from the squish area across the chamber directed at the plug could give some improved mixing, increase turbulence and result in a faster flame front. This could lead to a faster and a more complete burn, equalling more power and better economy. Less ignition advance would be required to give the (higher) peak cylinder pressure just after TDC.
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Old 3 Dec 2007, 20:33 (Ref:2080942)   #13
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Originally Posted by THR
F1 engines must have this sort of technology already, it would be something that they do all the time, esp with the camera in engine video.
I've seen footage of how Ferrari do it... they have a complete cylinder built of clear high pressure crystal and they just watch it with a high speed camera from outside. Nice to have that sort of money eh?
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Old 10 Dec 2007, 08:55 (Ref:2085374)   #14
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zefarelly should be qualifying in the top 5 on the gridzefarelly should be qualifying in the top 5 on the gridzefarelly should be qualifying in the top 5 on the grid
so If I just do chambers with a 4 1/2" cutting disc will I get 120 BHP/litre ?
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Old 10 Dec 2007, 18:04 (Ref:2085910)   #15
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SidewaysFeltham should be qualifying in the top 5 on the gridSidewaysFeltham should be qualifying in the top 5 on the grid

Nope!

With such sharp edges they will start to glow and cause awful pre-ignition!

One of the reasons one tries to arrive at clean and carefully rounded head contours is to avoid precisely that.

The greater the power output: the greater the BMEP: and the higher the operating temperature inside the combustion chamber.

Of course, you could consider changing the FoMoCo mill for a Briggs and Stratton........................................
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