OST-013: Massaging a virgin ;)
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08-18-2011, 02:35 AM
Post: #1
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OST-013: Massaging a virgin ;)
What have we here.... :cool:
![]() Let me introduce to you a virgin :eek: ![]() It is a brand new bare head - no valves, no seals, no wear! Work will begin on Monday ![]() This head is one of those being sold here: http://forums.club4ag.com/zerothread?id=93590 Dan - You can | ![]() OST Porting service - http://hachiroku.net/forums/showthread.php?t=19991 |
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08-18-2011, 07:35 AM
Post: #2
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OST-013: Massaging a virgin ;)
![]() ![]() general information - two weeks ago pismir had still one left, in case anyone is interested. AE86 ex-daily |
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08-18-2011, 10:26 PM
Post: #3
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OST-013: Massaging a virgin ;)
Holy crap!
![]() ![]() 1982 - TA60 Carina 4dr sedan - fun cruiser 1983 - AE86 Sprinter Trueno - import project 2013 - Honda Civic sport - daily driver 2004 - AEU86 dot ORG - daily domain Support our forum, buy from the AEU86 shop: ![]() |
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08-18-2011, 11:27 PM
Post: #4
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OST-013: Massaging a virgin ;)
banpei Wrote:Holy crap!you can say that again as I have another one of these being fitted with OS valves and worked by Loynings ![]() AE86 ex-daily |
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08-20-2011, 02:55 AM
Post: #5
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OST-013: Massaging a virgin ;)
![]() Dan - You can | ![]() OST Porting service - http://hachiroku.net/forums/showthread.php?t=19991 |
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08-20-2011, 07:16 PM
Post: #6
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OST-013: Massaging a virgin ;)
Well.... here are some before photos......
intake ports... note @ the top of each photo the mismatched seat. Also note the casting flash intake #1 ![]() intake #2 ![]() intake #3 ![]() intake #4 ![]() The exhaust ports are always rough, note how the port walls are "crowding" the flow. exhaust #1 ![]() exhaust #2 ![]() exhaust #3 ![]() exhaust #4 - note the mismatch size(one side is taller then the other) of the bowl from the right to the left in this port.... compare it to exhaust #3 and it is more evident ![]() Finally, chamber views. Note in these photos: 1) rough chamber edges(gasket mounting area) where the surface was machined. 2) the mismatched seats. 3) casting flash/flaws chamber #1 - both views ![]() ![]() chamber #2 - both views ![]() ![]() chamber #3 - both views ![]() ![]() chamber #4 - both views ![]() ![]() Dan - You can | ![]() OST Porting service - http://hachiroku.net/forums/showthread.php?t=19991 |
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08-21-2011, 12:01 AM
Post: #7
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OST-013: Massaging a virgin ;)
the proverbial other forum Wrote:Are you going to cc the virgin chambers? GREAT question....... and YES - that way I'll know definatively how large a truly stock combustion chamber is Dan - You can | ![]() OST Porting service - http://hachiroku.net/forums/showthread.php?t=19991 |
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08-23-2011, 01:37 AM
Post: #8
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OST-013: Massaging a virgin ;)
Work begins by checking the combustion chamber volumes. To do this I use a burette
![]() Chamber #4 measures out to 36.5cc. ![]() The other chambers measure out to; #3 = 36cc, #2 = 36.25cc, and #1 = 36.25cc ![]() As I deshroud the chamber, I'll also be equalizing their volume. Here is a photo show chamber #4 deshrouded, #3 chamber in the photo is not yet deshrouded. The chamber walls have been highly polished ![]() Bowl work begins, bowl #8 on the intake side is roughed to size. The factory production process is not perfect, so work is done to blend the bowls, valve seats and the chamber walls to allow maximum flow ![]() Working a bowl the key area is always the roof, here the bowl roof has been cleaned up, the guide narrowed some, and the guide boss has been narrowed substantially ![]() Finally for this post, a before and after on bowl #8 ![]() Dan - You can | ![]() OST Porting service - http://hachiroku.net/forums/showthread.php?t=19991 |
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08-23-2011, 01:51 AM
Post: #9
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OST-013: Massaging a virgin ;)
So now everyone can know that the stock chamber is between 36cc and 36.5cc, pretty cool to get proper CR
![]() Will you measure chambers after deshrouding ? Also, can you show us the tool you use for the guide boss ?! |
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08-23-2011, 02:22 AM
Post: #10
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OST-013: Massaging a virgin ;)
Project D Wrote:So now everyone can know that the stock chamber is between 36cc and 36.5cc, pretty cool to get proper CR I told my client that I would make sure all the chambers were balanced, so yes... I will have #s after deshrouding I use a Dremel for all of the porting I do. The guide bosses were reduced using a round cutting bit ![]() I then cleaned up after the round cutter with a few different round tipped abrasive bits ![]() Dan - You can | ![]() OST Porting service - http://hachiroku.net/forums/showthread.php?t=19991 |
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