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Join Date: Apr 2005
Location: Rancho Cucamonga, CA
Posts: 133
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2.7 heads
Hi, OK I resigned to the fact that the 2.7 case is max out. But after loOKing at the heads, well I can see where porting will help. Anyone have pictures of ported 2.7 heads? Or even just Porsche heads? Next, on the intake port there is a internal notch. Is that for a injector nozzle?, What's it purpose?
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08-13-2009, 06:20 PM
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Join Date: Jul 2001
Location: Portland Oregon
Posts: 7,007
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Hi,
LOL,..This is a complex subject and there is a LOT more to it than meets the eye,...  Port size is not as important as port flow & velocity and simply grinding/enlarging on them oftentimes ruins both flow and velocity very quickly. I see a lot of this as people modify their heads as part of an "upgrade" and simply ruin the factory's good work. This is one place where size isn't everything,... FWIW, stock 2.7S heads support power levels to 240 HP without any modifications so one would need a LOT more information about your engine what you are attempting to do before making any specific suggestions or recommendations. The notch, or cutout, in the port opening is for the CIS injector. One can build a real nifty 2.7 with the right combination of parts.
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Steve Weiner Rennsport Systems Portland Oregon (503) 244-0990 porsche@rennsportsystems.com www.rennsportsystems.com |
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08-13-2009, 07:23 PM
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Location: Rancho Cucamonga, CA
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Quote:
Complex, it would seem so. You state Nifty, Steve I would live very much to try and learn how to determine the "right combination of parts". I fully understand not hogging out the ports, but on the other hand. Porsche's live in the high revving range for torque and horse power. Right again as to me not understanding. I will do my own porting, however mildly though. I'd like very much to get my hand on some beryllium guides and seats. So Steve please share some of the nifty combos that I could look into to  . I do need the help, that a fact
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08-14-2009, 03:35 PM
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Location: Portland Oregon
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FWIW,..Beryllium is a poor choice for guides so I'd use something different.
If you keep the CIS, you are quite limited in everything you do so that really determines what modifications are possible.
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Steve Weiner Rennsport Systems Portland Oregon (503) 244-0990 porsche@rennsportsystems.com www.rennsportsystems.com |
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08-14-2009, 05:56 PM
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Location: Rancho Cucamonga, CA
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Quote:
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08-14-2009, 08:17 PM
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Max Sluiter
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I thought that the Beryllium Copper Bronze was better for guides than the Phosphor-Bronze. Something about "dry" lubrication for the areas where the valve stem seal wiped the stem of oil. Maybe excessively hard Phosphor-Bronze wearing the valve stem, too.
What is the recommended valve guide material now? What is wrong with the Beryllium Copper?
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance |
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08-14-2009, 10:57 PM
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Registered
Join Date: Apr 2005
Location: Rancho Cucamonga, CA
Posts: 133
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Beryllium Copper Bronze
Hi, here is a person in German that has built his own type IV VW head. He has used Beryllium Copper Bronze in both his guides and valve seats.
  If Dell West would have quoted me a price, I would have bought them. I do believe the beryllium cooper will work I don't think xtreme cylinder heads having brought to the market a new version of Porsche heads, and to have chosen beryllium cooper to take away from the new project.  In what way will the beryllium be an inferior addition 
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08-15-2009, 04:15 PM
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1971 Porsche 911S
