Porting & Polishing Datsun 240z Combustion Chambers

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Part of the Engine Build series this video provides and overview on the modification of the combustion chambers. Here we discuss the issues with the cylinder head and provide details on how to smooth the valve seat transitions, unshroud the valves and remove any hot spots.
The full article including tools and instructions can be found at:
www.kangamotors...
Related videos include:
Combustion Chamber Shaping:
• Datsun 240z - Combusti...
Measuring the Combustion Chamber CC:
• Datsun 240z CCing Comb...
Final measuring of the Combustion Chamber CC:
• Datsun 240z CCing Cham...
Combustion Chamber Finishing:
• Datsun 240z - Combusti...
Polishing the chambers
• Datsun 240z - Combusti...
Find out more about the engine build at: www.kangamotors...

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4 окт 2024

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Комментарии : 37

@rdh2059 10 месяцев назад

Great video. You explained what needed done, why and the process you used...

@mrbigg7255 6 лет назад

Never thought about grinding the old valve down for better access to the edge of the seat. It’s tough to get in there sometimes. Thanks for the tip.

@223remsucks 7 лет назад

Very informative! Much appreciated!

@KangaMotorsports 7 лет назад

Thank you, more engine build videos to come.

@223remsucks 7 лет назад

This will be fantastic. I've got an L20A to go in my '72 240Z here in the states, and these videos are going to be quite helpful.

@ELDIESTRODIY 6 лет назад

nice I'm gone make soon my sr20det head

@brd64021 6 лет назад

In the process of doing some similar work to my P79 head, hoping this head won't flat spot my cam like the last one.

@donwest5387 Год назад

I unshouded the valves in my Datsun head (by eye) and was .6cc different between chambers

@gav240z 7 лет назад

So are you an Australian living in the US? Your accent is odd, same thing happened to me living in Europe. I was wondering where the Kangaroo and Kanga came from on your website, but if you're an Aussie abroad that would make sense. I was reading up on your Subaru LSD install article, thanks for that! Must be great living in the US with so much access to S30Z parts!

@KangaMotorsports 7 лет назад

Australian living in US, been here for about 10 years, but I have lived in Europe and other places so my accent is all mixed up. Thanks glad you liked the Subaru article.

@gav240z 7 лет назад

after living in Europe for 7 years and returning to Australia my accent reverted back to 'normal'. Thanks for the videos etc.. I've subscribed for updates.

@KangaMotorsports 7 лет назад

gav240z yeah after a couple of hours I am back to normal too. Thanks for subscribing!

@robwhite240z 7 лет назад

1.your cyl head into your bare bored block and scribe to get chamber size CC to get 11 to 1 comp ratio . L series love high comp 2. Exhaust .Take out exhaust guides and shape guide boss to 45 deg angle shorten exhaust guide 10mm / 3/8 inch ,taper and reinstall 3. Intake open area under valve only and leave port w rough finish. 4. N/A motors need good long exhaust tune length pipes . smaller will scavenge better

@KangaMotorsports 7 лет назад

Thanks @robwhite240z. I am running a little less compression since I am in California and pump gas sucks. As the car is mostly used for touring around I didn't want to have find race gas or octane booster on road trips. Still looking into exhausts at the moment. I will have the shop knock down the exhaust guides when they do the valve job.

@3rd-eye-neenja563 4 года назад

you're a legend Ron!

@robwhite240z 4 года назад

@@3rd-eye-neenja563 Hi Bruce , you still out there in the youtube world

@3rd-eye-neenja563 3 года назад

@@robwhite240z hey Rob,,,how are you doing? Hope everything's good,,,almost done with my 260z ,,,,by summer 2021 will be finished ,,,,,

@robwhite240z 3 года назад

@@3rd-eye-neenja563 Hi Bruce, all good here, I have my 240Z up and running . the video is on you tube.

@donwest5387 Год назад

undercut the sides of the combustion chambers nearest the valves with a round burr

@danlombardi1797 4 года назад

Great video!!! Any idea on how many cc’s were added by doing this?

@KangaMotorsports 4 года назад

About 0.25 to 1.0 CC per chamber depending on the chamber but that prior to skimming the head for the fresh surface. I will know better when I complete final assembly and remeasure.

@michaelengelstad2055 3 года назад

@@KangaMotorsports updates on the final volume as a result of this work?

@donwest5387 Год назад

you mean unshrouding?

@donwest5387 Год назад

obtain a copy of How to modify your datsun 510; 240Z by Bob Waar

@kalbi777 6 лет назад

hi, first of thanks for your Videos. I just have a simple question. I tried doing the same but it looks like my head was poorly produced as there are alot of air bubbles in the cast (aluminium head) . Are all heads prepared like that or how did you removed this bubbles without removing too much material thanks in advance

@KangaMotorsports 6 лет назад

Glad the videos were helpful. Send me some photos in an email at: kangamotorsports@gmail.com and I'll take a look. I haven't seen that in any of the heads I have worked on but you might be right about a poor casting. What type of head is it?

@kalbi777 6 лет назад

it's a c14nz Opel (GM Family 1 engine) as i read on Wikipedia it is an aluminium head. I sended you some pics about the head. i'm curious what you Think about it

@KangaMotorsports 6 лет назад

That looks like a bad casting. Not sure how porous it is. Looks like you did the best you can do with the issues. You might just run it and see how it goes. You do want to be careful about taking too much material away especially if it doesn’t get better with the porosity and voids. Good luck with your motor build.

@kalbi777 6 лет назад

thank you for your imput man ! Keep going

@MindDezign 6 лет назад

What was the final result of this motor as a daily driver what other mods did this Z motor get? ( cam , ignition ? What ignition and settings you used ??? Its end of May 2018.

@KangaMotorsports 6 лет назад

Work is still a work in progress, a few life things and my race car have gotten in the way of finishing it. But still working on it from time to time. More videos to come.

@michaelengelstad2055 3 года назад

@@KangaMotorsports any updates on your motor's final performance?

@donwest5387 Год назад

install 280Z valves!