View single post by Scrambler82
 Posted: Sat Jan 12th, 2019 07:45 pm
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Old Bastard !

Joined: Fri Dec 22nd, 2017
Location: California USA
Posts: 2108
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- My only thought about back pressure is this... for a stock engine it is necessary to maintain the proper mixture of gases within the cylinder so not to allow raw gas to escape, while allowing full scavenging of the burnt gases.  This is achieved by exhaust gas back pressure, how you get there I can't go into, too stupid !

For high performance, high rpm engines, that are running long duration, high lift cams, and do not have a care in the world about fuel economy, then the free flowing exhaust comes in play.  There is a point that too much exhaust, too large exhaust valves, too much overlap in the Intake and exhaust valves, causes the fuel mixture to de-atomize, and flow out of the exhaust, not stay where it is needed.


Last edited on Sat Jan 12th, 2019 07:47 pm by Scrambler82

2003 EDGE, Std Cab, Steppie, E4 Red, 5sp, 4x
5" SuperLift, 33" x 12.50 x 15"
Hurst Shifter
Mod'd Backrack to fit Steppie
Front and Rear Bumpers by Custom 4x4 Fabrication, OK; now Mike's Welding and Fabrication.
Working on more Mods, just need more time, longer days would work !