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Crotchety Old Bastard
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Header Primary to Exhaust Port Fitment
Thought I would share some of the observations that we see when working to improve exhaust system function/performance. Most folks are aware that the heads are machined to allow the headers to slide up inside them. This gives a really nice transition and reduces the chance for gasket burnout and mis-alignment at the port. Having the header tube just meet the head when torqued to spec is the goal. Reproducing this measurement on every primary is not easy and why I am looking at it.
Anyway you don't get to see this alignment very often so here is a picture.  
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds '78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8 |
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08-14-2011, 09:45 AM
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Registered User
Join Date: Jul 2010
Location: Lithia, FL
Posts: 1,186
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beeeeeeautiful!!!
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1987 930 DTAFast EFI w/Electronic Dash, 17" Fuchs, Andial 8.39 R&P, C2 Intake, SuperCup Cams, Flame Ringed Heads & Cylinders, TurboKraft Full Bay Intercooler, RearlyL8 Twin Scroll Headers, Big Bullseye Twin Scroll Turbo  1999 Harley Davidson Custom 1250 Bobber 2010 BMW 335iTT, 2012 BMW 128i, 2011 Jeep JK (Boosted 12psi) 
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08-14-2011, 06:09 PM
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Registered User
Join Date: May 2008
Posts: 737
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The little details.
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'87, BMC air filter, Billet valve, 965 downpipe, Kokeln intercooler, GHL headers, Garrett T04B K27 hybrid, Tial w/.8 bar, WEGO IV, RarlyL8 dual out, LSD |
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08-16-2011, 04:57 PM
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Registered User
Join Date: Jul 2003
Location: Back in B'ham, AL
Posts: 2,621
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Are the spacers welded to the flanges now? I believe there is where my leak is on piston $6.
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08-18-2011, 03:08 PM
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Registered User
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Nice Brian, nice.
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79 Silver 930 3.4L , K27 ,SC Cams ,Andial IC ,Head Work ,Fuel kit, B&B Headers, Rarlyl8 duel, ERP T Bars, Von Shocks. Short Shift. |
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08-18-2011, 03:33 PM
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Registered User
Join Date: Mar 2000
Location: Auburn,In. U.S.A.
Posts: 2,284
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Bri:
Very nice buddy but I wouldn't expect anything else, you set the bar !!!! Remind me that if you ever come to see me I need to clean my garage before you get here. Dave
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Cole - 80 930 "The Old Sled" Mods: TurboKraft Custom IC, 934 Headers, K27S, Zork, Port Work, SC Cams, Air Mod Fuel Dist Relocated, Water Meth Injection, BL WUR, MSD 6530, Greddy EBC, Synapse Bov, Short 2nd & 3rd with 8:37 R&P, Wevo Shifter, Coupling, and Mounts, MTX-L SSI-4, Big Brakes, Rebel Coilovers, Bilstein Sports. |
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08-18-2011, 05:37 PM
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Crotchety Old Bastard
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I posted the pic just because you don't get to see that junction very often.
The reason I am looking at this is to set tighter specs. It was brought to my attention that variance occured on the gasket protectors and there is opportunity for improvement. Yes the spacers are spot-welded onto the flanges. If using short studs you can pop them off with a screw driver. You should have a set Miguel and if not I will send them to you.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds '78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8 |
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08-19-2011, 06:02 AM
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Registered User
Join Date: Jul 2010
Location: Lithia, FL
Posts: 1,186
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Brian, is there any advantage to running the spacers? I haven't ordered any studs yet, so I can go with any size there I might need...Thanks, RC
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1987 930 DTAFast EFI w/Electronic Dash, 17" Fuchs, Andial 8.39 R&P, C2 Intake, SuperCup Cams, Flame Ringed Heads & Cylinders, TurboKraft Full Bay Intercooler, RearlyL8 Twin Scroll Headers, Big Bullseye Twin Scroll Turbo 1999 Harley Davidson Custom 1250 Bobber 2010 BMW 335iTT, 2012 BMW 128i, 2011 Jeep JK (Boosted 12psi)
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08-19-2011, 06:28 AM
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Registered User
Join Date: Jul 2003
Location: Back in B'ham, AL
Posts: 2,621
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You already did, I'm good; better yet, moving back to B'ham... see ya'll.
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08-21-2011, 02:02 PM
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Crotchety Old Bastard
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We made spacers to make it easier for those with long studs. If you think stock long stud exchangers will ever be on the engine again then use long studs.
I hope that is good news Miguel, we'll sure be glad to have you back!
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds '78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8 |
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08-22-2011, 03:30 AM
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78 Porsche 911SC 3.0L, 3.3Turbo soon. 
