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#21 gav240z

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Posted 31 August 2015 - 01:25 PM

Peter I imagine with a regular L-series head (say P90 for example) you already know what areas to take out and move around, port, tickle etc.. for the optimum flow based on having done so many in the past.

 

When it comes to a complete unknown such as this engine head, with very few people having even seen 1 or worked on this cylinder head in the past, what approach to do you take to optimise flow? Do you have computer based modeling that you can rely on to help guide you? Or are you flying by the seat of your pants on something like this?

 

Given how rare the head is, how can you be confident to know where to remove material etc..? Not questioning your skills obviously, rather interested in your approach with such a unique piece?

 

By the way is the client located in Australia or Japan or somewhere else?



#22 Zedman240®

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Posted 31 August 2015 - 06:21 PM

Don't visit the site for a while and look at what I have missed!

 

Will you be making a video of it when its dyno time?



#23 peter mc

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Posted 01 September 2015 - 07:53 AM

Hi gav
Yes it would be a bit dangerous to just port away but i have seen the port work from os engine man and have a few good port pics and im flying over to see more in a few weeks
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#24 Blue Z

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Posted 05 September 2015 - 07:34 PM

Let's see who wins the HP challenge!

http://forums.hybrid...unworks/page-21

Good luck Peter!

#25 peter mc

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Posted 06 September 2015 - 03:55 PM

Yes good luck to them ..im taking the os to a new level ..its going injection 55mm itb drysump 13.1 comp hand made race pipes 90mm stroke monster only one thing in mind building the most outrageous NA L motor

#26 gav240z

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Posted 06 September 2015 - 05:53 PM

Let's see who wins the HP challenge!

http://forums.hybrid...unworks/page-21

Good luck Peter!

 

It's a great build, but doesn't interest me on the same level, the O.S Giken head is much more interesting because it's a cylinder head from that period.

 

 

Yes good luck to them ..im taking the os to a new level ..its going injection 55mm itb drysump 13.1 comp hand made race pipes 90mm stroke monster only one thing in mind building the most outrageous NA L motor

 

I love the fact that you're always challenging yourself to step it up to the next level Peter it's great to see.



#27 Gareth. J.

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Posted 06 September 2015 - 06:14 PM

Do you expect any issues with cooling when the block is grout filled?



#28 peter mc

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Posted 06 September 2015 - 06:38 PM

So far every block i have filled. We have not seen any change in cooling . As most of the cooling is needed at the top of the bore and head ..

#29 peter mc

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Posted 09 September 2015 - 06:40 PM

Working on the block this week. .making room for the 90mm stroke ..next week im flying over to japan to see os gikens engine man and get a few parts ..things are getting serious. .going to be a dream trip

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#30 GongZ

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Posted 09 September 2015 - 07:29 PM

Congratulations on the progress and have a great trip Peter - the excitement (and the engine) builds!  :P



#31 Gareth. J.

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Posted 10 September 2015 - 08:34 AM

Keep those pictures coming Pete!

Can't wait to hear this thing on the Dyno... I Can hear that 'Hakosuka GTR' YouTube clip in my head now.

#32 peter mc

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Posted 14 September 2015 - 03:52 PM

Well im flying over to japan next week to spend a few days with the head engine man at OS and then spend a day with the engine man at star road .so lots of pics coming up then the hard work starts .first up flow testing and then making the exhaust pipes .no small task .
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#33 PB260Z

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Posted 14 September 2015 - 08:48 PM

Have a great trip Pete, really looking forward to seeing your updates.

 

Travel Safe.

 

Cheers

 

PB



#34 peter mc

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Posted 28 September 2015 - 12:08 AM

Having the best time in japan so many cool things to see .spent 2 days with the people at os giken factory. Just great people. And there motors were fantastic.

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#35 PB260Z

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Posted 28 September 2015 - 12:10 PM

Great to hear that you having a good time.

How much excess baggage will you be bringing back ;)



#36 peter mc

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Posted 29 September 2015 - 11:48 PM

Haha about 57kg over had to pay lots

#37 Gareth. J.

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Posted 30 September 2015 - 11:27 AM

Living the dream Pete. How did you manage to keep it to only 57kgs. Lol.

#38 peter mc

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Posted 01 October 2015 - 08:15 PM

So first day back i had to know how well the os24b1 head flows stock and then with a good port to clean up a few problems.
Well first time on the bench it was quite clear the port was very small .and went in to choke and stoped flowing at 350 thou lift but still flowing 376hp .
Next i spent several hours doing the port and fixing the seat area. Well i was very surprised. 440hp flow first test ..i think 450hp flow is not going to be tuff to find

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#39 peter mc

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Posted 01 October 2015 - 10:33 PM

Many hours to go .and have to make a new set of valves .5 mm up in size to make best use of the seats .so its very possible theres 450hp flow .that will be one cracker L motor

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#40 dat2kman

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Posted 01 October 2015 - 10:38 PM

X-ray/sonc it to check on port wall thicknesses, and variations in core shift to the water passages???




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