View Single Post
RarlyL8 RarlyL8 is offline
Crotchety Old Bastard
 
RarlyL8's Avatar
 
Join Date: Jan 2000
Location: Huntsville, AL
Posts: 13,563
Garage
Keith, you can tell very quickly when the cylinders do not have a balanced AFR as the lean ones run hot. I use a pyrometer aimed at the base of each primary about 2" from the head to measure this. It does not take much of a lean condition to make a thin wall header glow red. This is also one reason I chose equal length primaries for my header system; it is more accurate to tune when each runner is the same volume.
__________________
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 02-06-2010, 08:03 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #51 (permalink)