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The Mighty Pieholio
 
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Join Date: Nov 2007
Location: North Canton, Ohio
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Quote:
Originally Posted by 2jmotorsports View Post
I am having trouble calculating my CR because I "eyeballed" TDC when I measured deck height. I may go back and re-measure it while setting TDC with a dial indicator. Maybe. Im getting kind of tired of all the precise measuring.
Another side bar:

Engine Builders Supply fly cut my heads to clean up for the new seal. They removed 0.006". I just looked up the formula for cylinder volume and did a little math and found 0.006" is worth 0.2 points of compression.

Years ago, I posted my math on this forum and it was confirmed.

So, 9.3:1 went to 9.5:1. I used standard (copper?) spacers at base of cylinders. Reason I knew they were standard spacers is Bruce Anderson's book talked about using fatter spacers if you went overboard.
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1981 911SC Targa
Old 11-10-2017, 12:50 PM
  Pelican Parts Technical Article Directory    Reply With Quote #101 (permalink)
Under the radar
 
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FWIW. My recently assembled SC motor's heads measured 89cc. IIRC the spec is 90. The JE 9.5 - 1 pistons ended up giving me a 9.8 - 1 CR.

I wonder if the Carrera heads have a slightly larger combustion chamber?
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Gordon
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'71 911 Coupe 3,0L outlawed
#56 PCA Redwood Region, GGR, NASA, Speed SF
Old 11-10-2017, 01:43 PM
  Pelican Parts Technical Article Directory    Reply With Quote #102 (permalink)
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Blasted and painted my cooling tins with VHT satin black.



Installed.



Dropped in head gasket rings.



Dropped on the heads with head stud nuts snugged then backed off a bit to allow the heads to move around and align with the cam tower dowel pin holes.



Cleaned and prepped cam tower and head bonding surfaces one last time and got all hardware and tools together.



Ready, set, GO! Applied the ooey gluey Threebond 1184 and got cracking.



Torque torque torque per the crazy order in the book. Cam was in place to make sure it moved freely.



Final torqued head studs and cam still moves freely. One side done.

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Jose - 1983 911SC Coupe
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Old 11-20-2017, 08:07 PM
  Pelican Parts Technical Article Directory    Reply With Quote #103 (permalink)
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Next day, repeated the same process for the other side.





Done.



The light at the end of the tunnel is getting brighter and brighter.





Tired of those chains dangling in testicular fashion, so chain boxes are next...
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Jose - 1983 911SC Coupe
Instagram: @joe_engineer
Old 11-20-2017, 08:18 PM
  Pelican Parts Technical Article Directory    Reply With Quote #104 (permalink)
The Dude abides...
 
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That looks AWESOME, Jose! Keep it up!
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'87 Targa Granite Green
Old 11-21-2017, 03:33 AM
  Pelican Parts Technical Article Directory    Reply With Quote #105 (permalink)
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Chain housings next. I didnt send these out to get cleaned up. I did it myself a while back but went over the sealing surfaces one more time with scotchbrite to get all traces of crud off.



I had to remove the old epoxy from the backsides using aircraft stripper, then wiped with solvent and re-applied new epoxy.



While the glue dried I went to install the threaded spray bar plugs on the rear of the cam housings. The chains housings partially block them so I had to take care of them now. Installed with green Loctite.





Housings cleaned and ready to install.

Note: The left (1-3) chain ramp has to be removed to get the chain installed correctly. I found this out after the fact when trying to get the chain through and ended up popping it off, torquing all fasteners, then putting the chain ramp back on.



Goo-ed up the right housing and gasket with 574.



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Jose - 1983 911SC Coupe
Instagram: @joe_engineer

Last edited by 2jmotorsports; 11-27-2017 at 08:02 AM..
Old 11-26-2017, 08:38 PM
  Pelican Parts Technical Article Directory    Reply With Quote #106 (permalink)
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Right housing on with all fasteners torqued.



Then the left housing (complete with the ramp removal, installation, torque, then ramp re-installation). No more dangly chains.



Rockers and idler arms with gears are out for rebuild. Cams are getting reground for heavier breathing.
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Jose - 1983 911SC Coupe
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Old 11-26-2017, 08:42 PM
  Pelican Parts Technical Article Directory    Reply With Quote #107 (permalink)
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Fantastic!
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1982 911SC
1998 Integra Type R
1964 Impala
Old 11-27-2017, 08:35 AM
  Pelican Parts Technical Article Directory    Reply With Quote #108 (permalink)
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Tidy work there
Old 11-27-2017, 09:32 AM
  Pelican Parts Technical Article Directory    Reply With Quote #109 (permalink)
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That's looking nice...
Old Yesterday, 06:33 AM
  Pelican Parts Technical Article Directory    Reply With Quote #110 (permalink)
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