924Board.org

[Chrenan]

Setup a research paypal account. I'm willing to chip in.
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1987 951 - M193 Version for Japan

[ideola]

Guys, we need to poop or get off the pot with this effort. I am always happy to coordinate, but I'm having a hard time determining what approach will best serve the 8 or 9 of us that are willing to contribute.

If you're all still in, we have enough to buy a block of 8 hours, but I need a clear indication if you all feel that it is a reasonable use of our pooled resources. If Roger can get a baseline done for much less, I am all for taking that approach, but I need to get back to Mr. Schmittling before I wear out my welcome with him.
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erstwhile owner of just about every 924 variant ever made

[morghen]

Roger...you have the mike.
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Supercharger and EFI kits
https://www.the924.com

[gegge]

Maybe I am just ignorante, but $600 for the basics is a lot. I find it difficult to justify the cost since my head already is streetported. Still, I am willing to contribute for the cause, consider it charity.
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Carl Fredrik Torkildsen

924 turbo -81 Carrera GT RESTOMOD
924 turbo -80 Dolomite De Luxe
924 -85 DP kit, BBS RS, M030 and tuned engine
924s -86 Black on black turbo with Fuchs

[peterld]

Roger where are you??? Otherwise I'm in for the first day with Mr Sch....

[ideola]

One thing to bear in mind is that this guy may not want to tie up his shop for a paltry 2 hours worth of work. In business, it's called opportunity cost. In order for him to make his equipment available to us, it means he can't use it for other high paying customers that are doing weeks or months of custom development work. Just a thought.

I don't think he's saying it will take 8 hours to baseline the head. I think he's saying he wants me to commit to a minimum of 8 hours, otherwise it's not worth his time. I can understand where he's coming from.
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erstwhile owner of just about every 924 variant ever made

[924guy]

I think its worth a day of testing to establish baseline, and hopefully, improvement potential... im still in..
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Eric
78 924
82 931 SE "smokey"
99' VehiCross
Y2K Honda Insight
http://www.cardomain.com/id/924Guy
Performance by Pasha

[RC]

Sorry guys, have been flat out busy and off the computer.

IDK, considering the rising unemployment in MI ATM, Mr. S seams to have a novel approach to business. A flow bench is nothing unique, like a dyno. He may be the only one in town but there must be thousands in the US keen for a few hours nominal work.

Not a problem doing it at any major centre in Au. Dollar is cheaper and shops still in business are willing to accommodate their customers needs.
As I am doing some minor port work and fitting slightly oversize valves anyway, that part will be free. Thats where most of the development time is spent. Ideally a pro will keep doing flow tests while working, at different stages. A probe in the port indicates areas of high or low velocity to dictate the relative restrictions. Then a bit more material is removed and then tested again. Epoxy or even molding clay (plasticine) builds up areas.

Personally just wanted a baseline flow number to compare my work to. Since there isn`t one, dont mind getting an initial test done, especially if a few others are willing to chip in $10 or $20. Was initially slightly reluctant to test the head I have since it appears to have been previously "cleaned up", having no prominent casting marks. However does not appear to have much more done but I don`t have a dead stock head to compare to.

If anyone has a stripped 931 head and can take some close up pics of the ports it will give a good indication. While it hopefully should flow slightly more than a stock cast head (or maybe slightly less even) it will give a reasonable ball park number. IDK, may even be factory anyway. I think it would be a minimum "remove the dags and blend in" on any basic performance head job, along with multiple angle cut or radiused seats. The largest gains are usually had with these easier initial operations.

For my stage 1 head am fitting 1 - 2 mm O/S valves but retaining stock seats. Another flow test here will really show the viability of going down this path, especially with the potential shrouding issue. Since I need new valves and guides anyway this is not a "development" expense. In fact custom 214N S/S valves are cheaper than stock ones. If the test actually reveals less than anticipated results I will just have to wear it, but everyone can learn from the mistake. On the other hand if the figures show an improvement it may be adequate incentive for further development, particularly by racers or those going for ultimate HP.

[ideola]

[gegge]

A copy of the 931 S1 blueprints.

If you are about to port the head, be aware of water jackets!
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Carl Fredrik Torkildsen

924 turbo -81 Carrera GT RESTOMOD
924 turbo -80 Dolomite De Luxe
924 -85 DP kit, BBS RS, M030 and tuned engine
924s -86 Black on black turbo with Fuchs

[ideola]

OK, now where in the heck did you get your hands on those?!?!???!

Eye opening...
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erstwhile owner of just about every 924 variant ever made

[ideola]

Comparing to endwrench's sectioned NA head:

(80% transparency on the left, 60% transparency on the right)

{EDIT}
Another attempt to do the superimposition a bit more precisely...70% transparency...also, up-sampled the image to 800x800 pixels:

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erstwhile owner of just about every 924 variant ever made

[Min]

very interesting stuff.

Min
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Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting.

[John Brown]

Oops. My bad
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John
80 931 - #931 44Cup
99 Escalade - tows track cars
gone but not forgotten: original 924.org car - 82

[Chrenan]