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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
Old 08-14-2011, 09:45 AM
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beeeeeeautiful!!!
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FS 1987 930 DTAFast EFI w/Electronic Dash, 17x9x11" Lindsey Racing 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
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Old 08-14-2011, 06:09 PM
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The little details.
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'87, Modified WUR, Billet valve, 965 downpipe, Kokeln intercooler, GHL headers, Garrett T04B K27 hybrid, Tial w/.8 bar, WEGO IV, RarlyL8 dual out, LSD
Old 08-16-2011, 04:57 PM
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Are the spacers welded to the flanges now? I believe there is where my leak is on piston $6.
Old 08-18-2011, 03:08 PM
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Nice Brian, nice.
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Old 08-18-2011, 03:33 PM
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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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Mods: TurboKraft Custom IC, 934 Headers, GSX 61, 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.
Old 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
Old 08-19-2011, 06:02 AM
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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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FS 1987 930 DTAFast EFI w/Electronic Dash, 17x9x11" Lindsey Racing 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 Hardtail Bobber
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Old 08-19-2011, 06:28 AM
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You already did, I'm good; better yet, moving back to B'ham... see ya'll.
Old 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
Old 08-22-2011, 03:30 AM
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Old 08-22-2011, 03:30 AM
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