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RarlyL8 RarlyL8 is offline
Crotchety Old Bastard
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Join Date: Jan 2000
Location: Huntsville, AL
Posts: 13,525
Take a digital infrared themometer with lazer dot aiming pointer and take a temp reading of the header primary tubes just below the heads at idle and you'll find #2 and #5 run alot hotter than the rest. Like close to 100 degrees hotter sometimes.
The data I have seen shows each set of cylinders run hotter as you go from front to back, 1/4, 2/5, 3/6 with the back 4 being closer in temp and the front 2 being the most cool. This is dyno data so no stop/go/idle as a street car would do. The purpose was to design a splitter for the shroud.

If you did not have data showing the volume/flow of each cylinder to not be significantly different I'd say the problem lies in the fuel head. Jim has a great idea to put a pyrometer on each bank and see what it says.
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 11-16-2011, 08:36 AM
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