KA24DE Head Cut Open For Porting

Post by **Aaron_9349** » Thu Mar 09, 2006 1:51 am

Hey everyone, I'm currently attending Wyotech, and I'm working on porting my head in Chassis Fabrication/HP Engines Class. I had a spare head from my previous engine problems (over heated) and decided to cut it up on the band saw to see what I could take off the ports. The head was previously ported and had a 3 angle valve job done, but the job was very crappy, and the ports could have been done better. So keep in mind you will have a little more thickness than these. The idea behind this was to see if there were any weak spots or thin spots in the water jackets, and to locate where they were in relationship to the ports.

Here are a few pics of the Head slices, the head was off a 95 240SX btw. As you can see, the water jackets surround the exhaust ports, but not fully around the intakes. Also you will notice a slight bump on the top of the exhaust ports before the guides, I plan on smoothing this out.

I have already finished porting the Intake ports (on my good head), and will begin the exhaust ports tomorrow. I have taken a lot of time on these ports, and think they look good. I will post pics of those if anyone's interested.

ALSO, I flowbenched the stock head, and the Intake ports flow 283.6 CFM @ .500" lift w/ 28" of vacuum!!! The Exhaust ports flow 200.4 CFM @ .500" w/ 28" of vacuum. These are stock flows for the head on a flow bench. The Intake does not peak until .500" lift, but the exhaust peaks around .300" - .400" lift. I think these are pretty good numbers, considering one kid did a set of Chevy 350 heads and they only flow 180's CFM on intake, and also another guy did a B16 which only flowed 200 CFM on the intake. I will also post the flows after my port job, and after my 3 angle valve job, so you guys can see. Hopefully I'll be able to bring that exhaust peak up a bit. I'm shooting for over 300 CFM on the intakes, dunno yet on the exhausts. Hope you guys find this information usefull.

Post by **Aaron_9349** » Thu Mar 09, 2006 1:55 am

Here's another pic, not as touched up as the one above, but still nice. I do have more of different angle cuts through the head, but felt these were the nicer ones.

Post by **nissanfanatic** » Thu Mar 09, 2006 2:31 am

Very awesome information. And thank you for sharing this info!

Post by **fabio420** » Thu Mar 09, 2006 3:43 am

ditto. keep on informing.

Post by **virus77** » Thu Mar 09, 2006 6:55 am

Thats awesome man...

Post by **AZhitman** » Thu Mar 09, 2006 7:10 am

NICE work!

This is article material - Keep it up man!

Post by **WDRacing** » Thu Mar 09, 2006 1:30 pm

Thats kickass!!!!! I love being able to look at all the various angles and obstruction. You should port one set of runners and do a before and after.

Again, thanks for sharing.

Post by **Aaron_9349** » Fri Mar 10, 2006 12:11 am

Ok, here's a little update. I finished porting all the intake ports today (finally). I have before and after pictures below. I also have flow bench results per .100" of valve lift for the STOCK head. These numbers are for 28" of vacuum.

Intake:Valve Lift / CFM.100" = 120.2.200" = 195.4.300" = 253.3.400" = 279.2.500" = 283.6

Exhaust:.100" = 110.5.200" = 165.3.300" = 187.7.400" = 197.4.500" = 200.6

There you are, base flow numbers for the stock head. I will have Post porting flow numbers early next week, and I will also have Post porting and 3 angle valve job numbers later that week. Here are the before and after pics of the intake ports. I should have exhaust before and after port pics tomorrow or monday. Enjoy!

Post by **Aaron_9349** » Fri Mar 10, 2006 12:12 am

Notice the casting marks all the way through the stock port (sorry picture is the best I had), on both sides of both ports. And here is a pic of an almost finished port (it was touched up a bit after photo)

Post by **Aaron_9349** » Fri Mar 10, 2006 12:15 am

And here's a pic of the seat end of the ports.

Post by **KA-T** » Fri Mar 10, 2006 4:19 am

Which Wyotech do you go to?

Post by **Chezedik** » Fri Mar 10, 2006 8:15 am

Can we get this in the sticky?

Post by **WDRacing** » Fri Mar 10, 2006 8:59 am

I'll sticky it once the thread has run it's course. People read the stickies last for some damn reason.

Post by **InsanityInc** » Fri Mar 10, 2006 9:53 am

But, but, everyone knows that the KA head is simply too crappy to flow at higher RPM levels!!11elevent

Heh heh.

Post by **Chezedik** » Fri Mar 10, 2006 10:09 am

But this for sure would be a very helpful guide on self porting. Particularly, because the pic is almost to scale (on a 17" monitor).

Post by **Aaron_9349** » Fri Mar 10, 2006 11:19 am

I go to the Laramie Campus, the original Wyotech, in Wyoming. I have 2 weeks left till I graduate, but it has been quite a fun experience. The instructor I have helping me with this port job is awesome, he's very experienced in engines. He has built 2, 1300+ HP Supras, an SR, a bunch of american small and big blocks, a datzun 2.8L stroker motor, as well as being huge in SCCA and being a toyota master tech. He's creating a new class dedicated just to High Performance engines. Should start in 2007, and it will be 3 months of just hp engines. He's planning on buying american and import engines for students to build, then dyno. He said the heads are done very nice, and that they should see a good amount of improvement.

FYI I also may be buying another 95 240SX today, which is bone stock. If I do, I will bring it in class and swap the head with the finished one and compare the gains/feel compared to stock and let you guys know what I think.

Post by **Aworkinprogress** » Fri Mar 10, 2006 1:15 pm

This is great info i am on my seat and waiting for flow numbers and discription.....when i say seat i mean drivers seat drifting=)

Post by **KA-T** » Sat Mar 11, 2006 7:44 am

That's cool man. I can't wait to get over to the chassis side and start on engines. I attend the Sac wyotech. I'm in Drivetrain right now on the 4th week. In the middle of getting our tranny rebuilt, we'll get our parts monday. Anyways, good luck with your head

Post by **Nismo_Freak** » Sat Mar 11, 2006 10:35 am

Nice

Stock SR Head for Reference @ 0.450" Lift

209.9 CFM Intake160.0 CFM Exhaust

Keep in mind the SR has smaller valves, and is designed for a 2.0L engine.

Post by **Aaron_9349** » Tue Mar 14, 2006 11:49 pm

Well, I finished the head, will have pics tomorrow, but the Post flow numbers were about the same as the Pre Porting flow numbers. And, this is kinda hard to believe, since I put a ton of time in the heads and they look really nice and smooth. BUT... I did buy another s14 this week, 95, which is bone stock, so I am pulling the head off tomorrow, and will reflow the numbers for the stock KA head. I tried flowing the head on two different flow benchs, to see if just the bench was off, but both were the same. I believe the original flow on the stock head was not properly set up, and thus flawwed.

Just so you know, Post the port and polish I flowed and Average of...

278 CFM on Intake, and 195 CFM on Exhaust.

Judging by this, I would have lost flow by porting, and there is no way that happened judging by the quality of the port job. So, I will reflow the stock head I pull off tomorrow, and have the REAL stock flow numbers. If I lost flow, I'm gonna be pissed :P

Post by **Aaron_9349** » Tue Mar 14, 2006 11:53 pm

Cool man, I heard the Sac. Campus is super lax on rules like cellphones and stuff. Hope you're having fun man, I'm about ready to go (8 days left). But have fun with the 4L60, its not so bad, that was my best class... 97%. But, hoping to pull off a nice grade this phase. Engines is where its at though man. Good luck man

Post by **my91silvia** » Wed Mar 15, 2006 12:43 pm

Awesome job man, I'm going to OSU in the nissan program this save me on guessing where water kackets are thanks

Post by **KA-T** » Wed Mar 15, 2006 6:50 pm

Man...they are not lax on the cell phone rule for sure... I actually surprised how strict the school is...not to much of bad thing though. We are actually rebuilding the 4T60-E's. Maybe they do a diff tranny at laramie. That's a good score.. Good luck

Post by **BlackHat** » Thu Mar 16, 2006 3:27 am

You did say the head had been ported before (however crappily). Could that have messed with your preport flow numbers?

Post by **Aaron_9349** » Thu Mar 16, 2006 11:25 pm

No, the head that was cut open (in half) was the one that was previously ported. The one I am porting was stock.

I finished the 3 angle valve job today, and should have the stock head off my new S14 benched by monday, with post valvejob flow numbers as well for the ported head.

The valves were cut to 44 degrees first, with a 30 degree after (towards stem).

The seats were cut to 45 degrees first, then 30 on top, and 60 below. My instructor helped me search for the optimal contact line thickness. The head is being set up for Boosting, but will so far just have stock everything in it, a cometic HG, and some ARP head studs. Hoping to make some adjustable cam gears out of the extra set I have (if time allows) Would be nice to get some pics on that for you guys, since they look easy enough to make. But don't know if I'll have time. This port job is taking longer than expected because I'm being to "perfectionistic", but I just want to make sure it doesn't take a crap on me on the way home.

Here's a pic of the stock valve bowls, and in it you can really see those casting lines I took out (compare to pic above).

Hopefully, I will have new stock flow numbers on monday and post 3 angle valve numbers as well.

Post by **emperor_lunchbox** » Fri Mar 17, 2006 10:55 am

Looks good. I was under the impression that the head flow was good enough though. I know that statment seems vague, but I was told by a few engine shops around me that they don't recommend porting the KA24DE head because the flow is already more than efficient.

Post by **WDRacing** » Fri Mar 17, 2006 11:40 am

Yeah, it does flow well. The intake however is very poor. We need an intake manifold option.

WD

Post by **1WheelWonder** » Fri Mar 17, 2006 1:55 pm

Thanks Aaron, this thread is really informative.

Post by **Nismo_Freak** » Fri Mar 17, 2006 2:09 pm

Aaron, if you can. It will be in the best interest of the KA guys to measure the length and diameter within the ports. Both port entry and valve entry diameter.

That will aid in constructing an intake manifold.

Post by **Aaron_9349** » Sat Mar 18, 2006 2:14 pm

I can do that on monday for ya. You want the stock diameters correct? Cause I already measured my ported ones and made sure they were as equal as possible (got them within about .003"-.001" of each other).

I pulled off the stock head on my new S14 on friday and was able to clean it up and flow bench the exhaust side before the end of the day. The stock exhaust ports flowed 180 CFM and peaked at .400" lift. That means that I gained about 15CFM since my ported head flowed an average of 195 CFM on the exhaust side. I will have the intake flow numbers on monday, and I may also flow the upper intake manifold runners to see what they flow, just for the heck of it.

BUT... If anyone knows the stock valve installed height for the head, I would appreciate it. Because I've been looking and haven't found a number that is accurate, and they don't have anything on All-Data. I need it to set the valves in the new head.

KA24DE Head Cut Open For Porting

KA24DE Head Cut Open For Porting & Base Port Flow Numbers

Re: KA24DE Head Cut Open For Porting & Base Port Flow Numbers (Aaron_9349)

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Re: KA24DE Head Cut Open For Porting & Base Port Flow Numbers (Aaron_9349)

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