Need KA24DE head porting input

[seajrl1]

Hey... I have an idea but I searched and searched but haven’t found any info on it… I want to port out my KA24DE head combustion chamber. Make it more like the low compression KA24E head Has anyone done this?Correct me if I’m wrong but it seems like there would be huge advantages:1. even out the bowl for better flow.2. that seems like a nasty edge that will cause hot spots right?3. will lower compression for my KA24DET project.4. and it seems like it would be better for a head gasket

The info that I need is.. What’s the KA24DE head combustion chamber cc volume?I’m shooting for 8.5:1 so I need to know how many cc’s to clear.I welcome people’s opinion to my idea

Thanks Jacob

[DRIFTEADOR]

porting is removing material (adding sometimes) from inside the intake and exhaust ports, not from the combustion chamber. the "bowl" refers to the bowl in the port. i wouldn't change the chamber design. instead, if you want to lower your cr, which i dont think it's necessary, just gt a thicker hg. oh, heres a link about chamber design:http://www.streetrodstuff.com/...5.php

[sil80drifter]

I had no idea the DOHC heads had this weird addition design tot heir heads, it has to be one of the reasons compression is higher on the DOHC engines. Pistons play a role too, but these edges must also be part of it.

sil80

[chandler]

I think he just wnats to know if that will cause hot spots or not, I mean I would want a head that wouldnt have hot spots myself

[seajrl1]

thx drifteador for correction of my terminology... I know there are other ways to lower the CR... so you’re saying the DE head chamber is a more efficient then the E? I would think using a thicker HG would make for a weaker motor (I mean as in relying on the taller HG to hold the forces in)Also you can see by those pictures that the fire makes it all the way around the ring on the HG. that would leave a little pocket that I think would hurt the efficiency...

~Jacob

[SimpleEnigma]

that is funny....i have always heard mopar muscle guys harp on their hemis and now hemis are in everthing v-8 that is chrysler...only now do i learn from that article that hemis truly suck...from and engineering and design standpoint....what a twist of fate.

[seajrl1]

lol yea i know what you you mean

[NateDogg]

read this: http://www.theoldone.com/components/cylinderheads/

You have some good questions. I think if you register to that board you will learn more than ever wanted from archives and articles.

To start I would recommend cleaning up some of the casting marks in the ports and equalizin the port roofs and port floors. If you dont have a flowbench you can screw stuff up, especially when working the bowls. If I had money I'd send the head to Larry at the link above.

[seajrl1]

Thanks NateDogg that site has a lot of great info...

[SSS]

Radius that edge into the combustion chamber which will probably reduce the overall chamber volume by around 0.5-0.75cc per chamber. Use a cartridge roll. That flat area that cuts into the circle of the chamber is known as a quench pad and actually helps stop detonation occurring by giving the chamber less uneven edges to create hotspots.

[SonyPete]

Huh "less uneven edges" well just one quick look at the pic will show the ridge is 2 more uneven edges in the combustion bowl.

[SonyPete]

Huh "less uneven edges" well just one quick look at the pic will show the ridge is 2 more uneven edges in the combustion bowl. The thoery seems odd to me. Not saying your wrong I just don't understand. Maybe the large flat surface helps reduce temps by absorbing allot more easier.

[seajrl1]

I now understand that flat area or quench pad and its function.. I also don’t get the “less uneven edges” concept.... here is a link that talks about the quench pad area http://www.theoldone.com/archive/quench-area.htm

[WDRacing]

The flad spots on either side of the bowl are for quench. This area helps the total burn take place. Don't do anyhting inside the combsuion chamber, unless your having it done at a machine shop. You can remove casting defects and or sharp edges that will produce hotspots. You have no way of taking an even amount of material from each bowl.

Just stick to the runners, you'll get a good amount of power if you have the runners ported and polished. Have a 3 angle valve grind done as well.

WD