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sudo apt-get purge 930
Join Date: Jul 2006
Location: Brandon, FL
Posts: 4,838
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Stupid Question???
What is the difference between the 41.5mm valve (930-105-419-51-M154) for the 911 and the 41.5mm valve (930-105-419-50-M154) for the 930? Is the shaft different? Different material? Curious to know about the intake valves as well.
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Mark 1979 930 Euro ***GONE AND DON'T MISS IT AT ALL*** "Worrying about depreciation on your car and keeping mileage down is like not ****ing your girlfriend so her next boyfriend finds her more appealing" --clutch-monkey |
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11-28-2007, 06:49 AM
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abit off center
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I think they run more guide clearance with the turbo engine, (smaller stem) and Sodium filled, Thats my stupid answer and I am sticking to it.
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______________________ Craig G2Performance Twinplug, head work, case savers, rockers arms, etc. Last edited by cgarr; 11-28-2007 at 08:11 AM.. |
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11-28-2007, 08:05 AM
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sudo apt-get purge 930
Join Date: Jul 2006
Location: Brandon, FL
Posts: 4,838
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They both use the same valve stem seals, seats, springs and retainers. Also, the valve guides are the same size for both on 1st and 2nd oversize, in fact, the part numbers are the same. So far everything seams the same except the valve part number and price.
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Mark 1979 930 Euro ***GONE AND DON'T MISS IT AT ALL*** "Worrying about depreciation on your car and keeping mileage down is like not ****ing your girlfriend so her next boyfriend finds her more appealing" --clutch-monkey |
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11-28-2007, 09:15 AM
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Moderator
Join Date: Dec 2001
Posts: 9,569
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PET shows '51 for the 930.20/21/26 and '50 for the 930.66/68 So one's for the Turbo and one's for the NA version.
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'66 911 #304065 Irischgruen ‘96 993 Carrera 2 Polarsilber '81 R65 Ex-'71 911 PCA C-Stock Club Racer #806 (Sold 5/15/13) Ex-'88 Carrera (Sold 3/29/02) Ex-'91 Carrera 2 Cabriolet (Sold 8/20/04) Ex-'89 944 Turbo S (Sold 8/21/20) |
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11-28-2007, 09:46 AM
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sudo apt-get purge 930
Join Date: Jul 2006
Location: Brandon, FL
Posts: 4,838
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Yes, I realize the part numbers are different. My question is what is actually different about them physically. All other pieces are the same (valve stem seals, valve guides, seats, springs and retainers). The valve dimensions are the same. So what really makes them different than the N/A valves?
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Mark 1979 930 Euro ***GONE AND DON'T MISS IT AT ALL*** "Worrying about depreciation on your car and keeping mileage down is like not ****ing your girlfriend so her next boyfriend finds her more appealing" --clutch-monkey |
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11-28-2007, 09:51 AM
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abit off center
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I think if you mic the stems you will find the turbo valve stem to be about .001 smaller than the na valve stem.
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______________________ Craig G2Performance Twinplug, head work, case savers, rockers arms, etc. |
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11-28-2007, 10:04 AM
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Moderator
Join Date: Dec 2001
Posts: 9,569
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Why wouldn't you just ream the guide bigger rather than having a different size stem?
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'66 911 #304065 Irischgruen ‘96 993 Carrera 2 Polarsilber '81 R65 Ex-'71 911 PCA C-Stock Club Racer #806 (Sold 5/15/13) Ex-'88 Carrera (Sold 3/29/02) Ex-'91 Carrera 2 Cabriolet (Sold 8/20/04) Ex-'89 944 Turbo S (Sold 8/21/20) |
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11-28-2007, 10:23 AM
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sudo apt-get purge 930
Join Date: Jul 2006
Location: Brandon, FL
Posts: 4,838
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What is the reason for more clearance?
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Mark 1979 930 Euro ***GONE AND DON'T MISS IT AT ALL*** "Worrying about depreciation on your car and keeping mileage down is like not ****ing your girlfriend so her next boyfriend finds her more appealing" --clutch-monkey |
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11-28-2007, 10:24 AM
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Registered
Join Date: Sep 2007
Location: East Texas
Posts: 240
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they run hotter and have more thermal expansion? that would be my guess, i guessing we can guess on this topic
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11-28-2007, 11:55 AM
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sudo apt-get purge 930
Join Date: Jul 2006
Location: Brandon, FL
Posts: 4,838
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I'm trying to justify why an (apparently) identical set of intake and exhaust valves that are $268.50 for N/A will cost me $600 for my turbo. I want to believe there is some justifiable reason and not just the turbo tax. I'm curious to know if there is a metallurgical difference between the two.
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Mark 1979 930 Euro ***GONE AND DON'T MISS IT AT ALL*** "Worrying about depreciation on your car and keeping mileage down is like not ****ing your girlfriend so her next boyfriend finds her more appealing" --clutch-monkey Last edited by equality72521; 11-28-2007 at 12:33 PM.. |
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11-28-2007, 12:29 PM
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Registered
Join Date: May 2005
Location: Cridersville, OH
Posts: 1,879
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Just a guess, but I'd bet the turbo's are inconel, nitrided or possibly sodium filled.
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75 911 Indian Red- RUFWAN2B 2000 Boxster 2000 & 2007 Dobies www.stahlwerks.com Cages and preparation for your Porsche “People who never make mistakes must get tired of doing nothing” Bill : The origin of the orgy of Porsche |
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11-28-2007, 02:22 PM
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Welcome to the world of 930 ownership.. take any n/a price and go x2 to get the 930 cost.... As a buddy of mine once told me.. " you have to pay the TROLL the TOLL to play".
I'm sure there is a slight diff in the parts... |
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11-29-2007, 12:08 PM
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sudo apt-get purge 930
Join Date: Jul 2006
Location: Brandon, FL
Posts: 4,838
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Is there anyone who actually "knows" the difference?
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Mark 1979 930 Euro ***GONE AND DON'T MISS IT AT ALL*** "Worrying about depreciation on your car and keeping mileage down is like not ****ing your girlfriend so her next boyfriend finds her more appealing" --clutch-monkey |
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11-29-2007, 12:42 PM
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Join Date: Jul 2007
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Call Danny at P3automotive.. and ask him. He will know.
P3 Automotive in Centerville Danny L King P3 Automotive 445 Miamisburg-Centerville Rd Centerville, OH 45459 http://www.p3automotive.com turbotech@p3automotive.com |
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11-30-2007, 12:51 PM
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sudo apt-get purge 930
Join Date: Jul 2006
Location: Brandon, FL
Posts: 4,838
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Thanks Eric.
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Mark 1979 930 Euro ***GONE AND DON'T MISS IT AT ALL*** "Worrying about depreciation on your car and keeping mileage down is like not ****ing your girlfriend so her next boyfriend finds her more appealing" --clutch-monkey |
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11-30-2007, 12:53 PM
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A fellow Pelacanite
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I am sure I have read that they are sodium filled.
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG. Fitting - New service kit. Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head. 1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods. Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit. http://www.danasoft.com/sig/Iamnotanumber.jpg |
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12-01-2007, 01:05 PM
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1969 and 1986 Porsche Targa and Coupe 1720cc and 3
