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Registered
Join Date: Oct 2006
Location: MYR S.C.
Posts: 17,321
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will this improve performance
from the looks of the carbon left on the intake ports, it looks like the runners are a little bigger than the port opening. would it be worth the time to grind the edge of the port out to the carbon edge and down about 5mm or so. i would think the sharp edge would restrict air flow.
 
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01-28-2009, 04:32 PM
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UNDER CONSTRUCTION!
Join Date: Jul 2008
Location: ALASKA
Posts: 1,508
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i think what your looking at is the gasket outline I'm pretty sure when i looked my 2.7 over i decided that the intake runners and head port size was the same. what you would be doing is gasket matching your heads and intake runners. as far as performance gain i think it would take a dyno to even come close to telling that. i thought after looking at the flow characteristics of the CIS box itself going through the rubber sleeves etc. that it wouldn't be worth it.
just my two cents I'm sure someone has a good reason to do it, other than it would be good experience. ed
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Sometimes the first thing that comes to mind should be the last thing that you do! 
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01-28-2009, 05:36 PM
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Navin Johnson
Join Date: Mar 2002
Location: Wantagh, NY
Posts: 8,812
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gasket matching....
All these little hot rod tricks add up to: More Power
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Don't feed the trolls. Don't quote the trolls  http://www.southshoreperformanceny.com '69 911 GT-5 '75 914 GT-3 and others |
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01-28-2009, 05:41 PM
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Registered
Join Date: Mar 2001
Location: Marysville Wa.
Posts: 22,481
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the gasket ID is larger than the head port.
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01-28-2009, 06:52 PM
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Also looks like the gasket was installed backwards. The cutout in the gasket should be installed over the carved out area of the head. Was installed at the 1 o'clock position (in the picture) should be at the 11 o'clock position.
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01-28-2009, 07:06 PM
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Registered
Join Date: Dec 1999
Location: Novato, CA
Posts: 4,740
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You need to flip the gasket up side down.
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01-29-2009, 03:57 AM
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Registered
Join Date: Oct 2006
Location: MYR S.C.
Posts: 17,321
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i was not sure if the gasket was too big and left the carbon or if it was the runners themselves. perhaps a measurement is in order. i was taking pics for something else last night and thought i would post this while i was at it. perhaps i should have waited
looking at the pics again, it does look like the gaskets may have been flipped, but if they were, wouldnt they be in the way of the injectors or do they have double cutouts for the injestors? i will have to look at see if i still have them
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86 930 94kmiles [_ _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
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01-29-2009, 05:11 AM
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911 coupe
