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ideola
Joined: 01 Oct 2004
Posts: 15548
Location: Spring Lake MI
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 Posted: Wed Jul 22, 2009 7:46 am Post subject: Getting Head Porn Pix |
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Sorry boys, just couldn't resist the temptation to once again plagiarize from the Roger G. tradition of suggestive subjects 
Just arrived today:
 
Intake ports
 
Integral cam & Piper solid lifters
 
Exhaust ports
 
Combustion chambers
 
Valves & seats
 
Can anyone say...
Specifications
44mm intake valves & seats
37mm exhaust valves & seats
Guides & seals
Chromoly retainers
Heat treated valve keepers
Ceramic coated exhaust ports & combustion chambers
Cost
Parts: $346
Labor: $650
Coating: $250
TOTAL: $1246
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erstwhile owner of just about every 924 variant ever made |
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Shurick
Joined: 15 May 2005
Posts: 524
Location: Russia, Moscow.
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| Posted: Wed Jul 22, 2009 7:50 am Post subject: |
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Love that porn pics! Pure sex!
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WBR, Shurick
'79 931 -- intercooled K26-3060-6.10 turbo @ 1.2 bar, EFI+EDIS, 951S brakes, stripped interior, 951 look.
'86 924S -- R.I.P.
https://www.instagram.com/ru_pacecar/ |
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RC
Joined: 25 Mar 2007
Posts: 2636
Location: Australia
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| Posted: Wed Jul 22, 2009 10:04 am Post subject: |
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Don`t we all enjoy a good head job? 
Details?
Such as stem diameter, guides, chamber volume & width, ........... ?
Was the ex seat replaced? Any idea of seat bore size?
Would be nice to see pics of it unassembled. |
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Min
Joined: 04 Nov 2002
Posts: 2368
Location: Vernon, British Columbia, Canada
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| Posted: Wed Jul 22, 2009 10:37 am Post subject: |
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Any thoughts on cam break in? What did they set your valve clearances to?
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. |
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11724
Location: PacNW
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| Posted: Wed Jul 22, 2009 1:13 pm Post subject: |
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Why no coating on the entire combustion area?
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Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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pocketscience
Joined: 23 Apr 2006
Posts: 1650
Location: Sydney, Australia... mate!
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| Posted: Wed Jul 22, 2009 8:21 pm Post subject: |
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(searching for a question to ask...)
Ohh ohh... did you get all the foam bits out of the head??
G.
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Whoever said you can't buy happiness forgot about Porsche!
81 924 N/A, GTS lights, Saratoga, interior, headers, Integral cam, EFI (sold)
95 993
69 911 |
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ideola
Joined: 01 Oct 2004
Posts: 15548
Location: Spring Lake MI
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| Posted: Wed Jul 22, 2009 9:24 pm Post subject: |
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| RC wrote: | | Such as stem diameter, guides, chamber volume & width, ........... ? |
I sent it to European Motoworks (I grew too impatient with trying to find a local resource I felt comfortable with...had the funds, decided to just bite the bullet and send it to Jorge). After discussing with Jorge, it seems he has a ready supply of the "big valve kit", either on the shelf or pretty much available at a moments notice. This "kit" includes the stainless valves, seats, guides, retainers, and keepers. The valve stem diameter is 8mm. Since we now know there is little difference between the 931 and NA head in terms of the ports, I suspect that the chamber volume will be very similar to what was reported on the "big valve head" years ago.
| RC wrote: | | Was the ex seat replaced? Any idea of seat bore size? |
Yes, both seats are brand new. I don't know the bore size, but I can ask.
| RC wrote: | | Would be nice to see pics of it unassembled. |
Agreed. The per piece prices aren't too outrageous, I am still contemplating buying a single set of everything from Jorge for further research. If this comes about, I'll post pix.
| Min wrote: | | Any thoughts on cam break in? What did they set your valve clearances to? |
I sent Jorge the instructions I got from Steve at Integral, so clearances are currently at the cold lash listed on the instruction sheet. I'll cross the cam break in bridge when I get to it, which probably won't be until next spring.
| Rasta wrote: | | Why no coating on the entire combustion area? |
Dunno. Maybe because they didn't have a sample piston to work with? Jorge sent it out to have the coating done, and this is how it came back. I didn't see it until it arrived, so no opportunity to query on that. I'm not going to worry about it.
| pocketscience wrote: | | did you get all the foam bits out of the head?? |
 Head was nicely double wrapped in thick mylar, so no worries there.
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erstwhile owner of just about every 924 variant ever made |
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924RACR
Joined: 29 Jul 2001
Posts: 8817
Location: Royal Oak, MI, USA
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| Posted: Wed Jul 22, 2009 10:29 pm Post subject: |
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Awesome...
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype |
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ideola
Joined: 01 Oct 2004
Posts: 15548
Location: Spring Lake MI
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| Posted: Thu Jul 23, 2009 3:26 am Post subject: |
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I should also mention, I sent Jorge a set of the Performance Springs that Roger helped us source. I asked Jorge to review their specs compared to what he had access to, as well as the lift specs provided by Integral. I told him that money wasn't an issue, and to use whatever he felt was best based on the available information.
He installed the Performance Springs that I provided. FWIW.
{EDIT}
Oh yeah, almost forgot, here are some in-progress pix that Jorge sent to me earlier, which show the valve seats prior to final assembly. The photos are blurry (sorry, I didn't snap these!), but maybe they'll be interesting to look at?
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erstwhile owner of just about every 924 variant ever made |
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RC
Joined: 25 Mar 2007
Posts: 2636
Location: Australia
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| Posted: Thu Jul 23, 2009 10:04 am Post subject: |
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It is the combustion chamber volume that I inquired about seeing that some material has been machined from the wall adjacent to the intake valve. Only looks like a few cc at most but clearly must be included in your CR calculations. Knowing that the stock chamber width is very close to std bore size, wonder what the maximum width is now. Sure that you are using O/S pistons Dan so should be fine. If you get a chance, see what the largest reading you can get with internal calipers.
From experience, the cold lash set up clearance given by Integral is spot on. They know what they`re doing. IIRC was 0.011" and it does indeed grow to the required 0.015" when hot. Would follow the instructions regarding run in RPM etc but pour a can of ZDDP additive over the assembly, rather than the traditional moly lube.
After the equivalent of a few hundred miles engine break in the lifter shims may likely need replacement or some surface grinding to maintain desired clearance. More of a PITA than the basic screw adjustment but no drama at all, and half as easy as a 4 valve.
Feel confident basing the spring pressures on Integrals figures. They spin their prototype cams in a spintron at all RPM, past red line, and run computer diagnostics on the valve train to verify their profiles and data. Porsche would not have had this technology over 30 years ago and AFAIK have not released any official valve spring specs. There`s no denying that the OE cam and valvetrain is far from an ideal design. |
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11724
Location: PacNW
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| Posted: Thu Jul 23, 2009 12:47 pm Post subject: |
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| RC wrote: | | There`s no denying that the OE cam and valvetrain is far from an ideal design. |
. . .unless your name is Rennjungen.
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Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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tuurbo
Joined: 08 Aug 2007
Posts: 1446
Location: East Windsor, New Jersey
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| Posted: Fri Jul 24, 2009 10:32 pm Post subject: |
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When you consider what you're getting and comparing it to present day costs for a head for any high performance car, that's a pretty good deal with the coatings and the big valve job.
Good choice Dan.
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1980 924 turbo, MSD, Meth. Inj, otherwise stock. |
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Raceboy
Joined: 01 Mar 2004
Posts: 2326
Location: Estonia, Europe
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| Posted: Fri Jul 24, 2009 11:19 pm Post subject: |
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| Rasta Monsta wrote: |
. . .unless your name is Rennjungen. |
Why don't you just try to think sometimes before you post and when you have to do that, just don't post, ok?
I have my experience that I'm willing to share. Obviously no one has to agree with what I've found out and said but what gives you the right to make a mockery of everything I've said?
From now, this is my last post on this board unless a$$hole named Rasta Monsta will get some manners that he didn't got from his parents.
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'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold 
'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche |
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11724
Location: PacNW
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| Posted: Fri Jul 24, 2009 11:27 pm Post subject: |
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Just teasin' ya, man. And if you search back, I don't think you'll find me calling you names. . .
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Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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ideola
Joined: 01 Oct 2004
Posts: 15548
Location: Spring Lake MI
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| Posted: Fri Jul 24, 2009 11:40 pm Post subject: |
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Raceboy, it's just stinky cheese man, stinky cheese. Rasta's frequently lame attempts at humor are difficult to comprehend, even for many of us that share his culture...can't imagine how it must come across when the humor doesn't transcend cultural barriers.
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erstwhile owner of just about every 924 variant ever made |
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