Combustion chamber slot what the....?

[milner351]

Can't wait to read some of your reactions to this:

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

[Loren]

Re: Combustion chamber slot what the....?

Sounds a little too much like an ad for a "magnetic-infrared vortex fuel bubble-izer" but has some interesting points. Guess you'd have to just try it and see. Remember, if you do...they'll hold the patent on cutting a groove in your combustion chamber so you'll have to send them money. ;)

[TC]

Re: Combustion chamber slot what the....?

Well since they are not trying to make any money off of it, I'll say it's plausible. ;)

[dieselgeek]

Re: Combustion chamber slot what the....?

Have seen similar stuff in diesels, where they spend a LOT more time working on combustion chamber design...

although I'd believe that with forced induction you'd be looking at hot spots along the ridges that would cause other problems.

[min301]

Re: Combustion chamber slot what the....?

Agreed.

Those may negatively affect mixture control.

[dieselgeek]

Re: Combustion chamber slot what the....?

Agreed.

Those may negatively affect mixture control.

actually i am pretty sure anything in the combustion chamber that "stirs" the mixture is a good thing.

[CTX-SLPR]

Re: Combustion chamber slot what the....?

Didn't both GM and Ford try this and end up with valve shrouding and carbon hotspot buildup?

[min301]

Re: Combustion chamber slot what the....?

Agreed.

Those may negatively affect mixture control.

actually actually I am pretty sure anything in the combustion chamber that "stirs" the mixture is a good thing.

Didn't both GM and Ford try this and end up with valve shrouding and carbon hotspot buildup?


Would seem so...

[std]

Re: Combustion chamber slot what the....?

We used to cut grooves in the heads of our snowmobiles almost 20 years ago. I don't it's new.

[Falcon67]

Re: Combustion chamber slot what the....?

IIRC, there was a big discussion about this on the big block Ford list. It's been around for a while.

[smallblockjay]

Re: Combustion chamber slot what the....?

Lets all carve big swirls in the tops of our pistons and make cumbustion chambers look like

;D

[Eric68]

Re: Combustion chamber slot what the....?

You could really get some good swirl going with that Jay ;D

Seriously though, it's been around for a while and never caught on. Been tested a bunch too and very few serious engine guys bother (frankly, none that I know of). Seems like everyone would be doing this by now if if had proven worth while (it's cheap to do). If a combustion chamber and port are right to begin with you shouldn't have to do any weird tricks to improve combustion.

[TC]

Re: Combustion chamber slot what the....?

You know, I don't think this slot idea is about making more turbulence in the chamber. For one they are talking about the "quench area". Take a look at this pic and look at the quench area, see how the aluminum is showing on the edges of where the cylinder walls are.


Now look at this pic, that has a groove through the quench area, see how you can't see anymore aluminum around the edges.


Basically it's the old line of gun powder to the explosive trick. Basically by creating that groove your giving the flame in the combustion chamber a bigger route into the quench areas, thus allowing the fuel that is trapped in there to ignite easier.

So I guess if you want to know it you should do it or not, go pull a head and see if you have any clean spots. ;)

[min301]

Re: Combustion chamber slot what the....?

You know, I don't think this slot idea is about making more turbulence in the chamber. For one they are talking about the "quench area". Take a look at this pic and look at the quench area, see how the aluminum is showing on the edges of where the cylinder walls are.


Now look at this pic, that has a groove through the quench area, see how you can't see anymore aluminum around the edges.


Basically it's the old line of gun powder to the explosive trick. Basically by creating that groove your giving the flame in the combustion chamber a bigger route into the quench areas, thus allowing the fuel that is trapped in there to ignite easier.

So I guess if you want to know it you should do it or not, go pull a head and see if you have any clean spots. ;)

It's the only reason for it.
The groove, or whatever you mods you do to the chamber,
is to create turbulence, and keep the a/f mixture suspended, and mixed.

it's not worth bothering, as Eric stated.
I can hear it now....

[Caddyman]

Re: Combustion chamber slot what the....?

If I pulled a head like the one with all the OIL on the valve heads, I'd probably look more into why thats there.

I don't think the slots lean the engine out, or make it less "oily"....it looks like someone forgot to install valvestem seals on one intake and exhaust set.


Didn't someone post up a Buicks cylinder head picture a while back that looked just like this?....CTX Sleeper? or the Impala guy?

It looks very familiar...and he found (I think?) a loose guide causing the same thing....

without all the fancy slots and theorization of the combustification of the compressionulation of the gaseous matterization of the intakeification?

If this ^ sounds like bs...it should....just like head slots............


BTW, a loose ring package will do the same thing...wash down the edges of the head. The coldest areas are the thickest. They don't "burn" as fast or fully. The oil residue from a loose ring pack will "wash" the coldest part of the cylinder clean...and give the the result you see. This is really prodominant in engines with "cut" piston edges.
You know, the pistons with the 45* 1/4" wide area at the piston top/side? (Think stock SBC)
Its not as common on pistons with "sharper" corners...which BTW have better quench due to less total "squish" area around the piston edge.

The cylinder next to it probably has tighter rings and a better valve to guide clearance?...or undamaged seals?....maybe a tighter rod bearing?...or an unworn piston/ring set?

This is like Probability and Statistics 101....if you rig the question right, you can get whatever answer you want.

Unfortunately, there ain't money in slots.

If there were, someone would sell
"pre-slotted, patented quench combustion chambered heads, that show a 50hp increase in conventional, obsolete head technology".

The Chinese copy-cat-ers probably already have them.... 8)