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Registered User
Join Date: Apr 2009
Location: Grasonville, Maryland
Posts: 81
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2.7L to 2.8 with Carbs
If you take a stock 2.7 and want to increase performance, it seems the going suggestion is 92mm P&C, with 964 Cam, Carbs and backdated exhaust. If you go to the 92mm P&C, you have to machine the heads, right? I think that is what I am understanding from Bruce Anderson's book.
To do the headwork, what is an estimated cost?
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1976 911s Targa 1976 911s Coupe |
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11-16-2009, 08:53 AM
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Registered User
Join Date: Oct 2008
Location: 27882, NC
Posts: 1,116
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Why would you use 964 cams? early S or Solex would be the way
The cylinders are slip in, what would you do with the heads, they should bolt right up, youre only opening 2.7 cyl 1mm of the wall. Bruce Bruce |
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11-16-2009, 09:12 AM
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Registered User
Join Date: Dec 2005
Location: Reston, VA
Posts: 328
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old style vs new style
Depends on what kind of pistons you get for the 2.8. Old 'honest to goodness' 2.8 pistons had crowns for the larger volume unobtainium 2.8RSR heads. So with 2.7 heads they have lots of compression and will touch at the edges. A chamfer on the heads is required. More modern versions exist that have 'correct' crowns for the 2.7 heads.
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11-16-2009, 09:24 AM
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Registered User
Join Date: Apr 2009
Location: Grasonville, Maryland
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Bruce's book talks about needing to widen the heads to 36mm from 32. I am not sure if that is for all set ups with bigger cylinders or specific to a certain setup. I was wondering if you increase the cylinder size, do you also increase the head size to be compatible.
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1976 911s Targa 1976 911s Coupe |
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11-16-2009, 09:31 AM
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Registered User
Join Date: Apr 2009
Location: Grasonville, Maryland
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Tadd, thanks. I think they clears up what Bruce was saying in his book. I was thinking of having my 2.7 cylinders bored to 2.8 so I assume the clearance would stay the same and I could use the existing heads without machine work on them (other than clean up and valve job).
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1976 911s Targa 1976 911s Coupe |
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11-16-2009, 09:37 AM
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Registered User
Join Date: Dec 2005
Location: Reston, VA
Posts: 328
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bored 2.7 cylinders
Do you have the CE ring grove? The cylinder gets mighty thin at 92mm and is prone to breaking off at the whiff of detonation. Mahle deleted the grove on there 92s.
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Building molecues or building cars... you do get more of first in every batch. A mole of porsches anyone? |
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11-16-2009, 10:41 AM
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Registered User
Join Date: Jul 2000
Location: So. Calif.
Posts: 12,153
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Quote:
Thus, an aftermarket piston (JE or other) along with larger cylinders begins the process. Sherwood |
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11-16-2009, 12:42 PM
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Registered User
Join Date: Dec 2005
Location: Reston, VA
Posts: 328
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Ln
I'm pretty sure that Charles (LN Engineering) can strip, bore, then recoat.
Hes going to strip and replate/hone as set of 92s for me, so tossing in a bore should be pie... but talk to the man first. t
__________________
Building molecues or building cars... you do get more of first in every batch. A mole of porsches anyone? |
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11-16-2009, 01:22 PM
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