Mud-club

Vehicle & Technical => Discovery => Topic started by: petergalileo on April 08, 2006, 17:55:30

Title: Strange V8 cylinder heads
Post by: petergalileo on April 08, 2006, 17:55:30

I have these allen socket plugs on my cylinder heads.  I have seen numerous v8 discoveries, defenders and rangies but not one with the allen sockets.  They are on both heads on every cylinder near exhaust outlet.  Any idea what they are for, and why I have them on mine.

Title: Strange V8 cylinder heads
Post by: Range Rover Blues on April 08, 2006, 18:11:38

What year is the engine?  My (eduacted) guess is that is for pulse-air, an emision control used either/or with EGR in some countries like the USA.  Quite common to see on MGBs.

Title: Strange V8 cylinder heads
Post by: petergalileo on April 08, 2006, 18:15:03

Its on a G reg disco 1990 but whether its the original engine is anyones guess.

Peter

Title: Strange V8 cylinder heads
Post by: Range Rover Blues on April 08, 2006, 18:19:38

Pre catalyst model then, quite likey it's the pulse-air.  Just ignore them.

Title: Strange V8 cylinder heads
Post by: JIM 2B on April 09, 2006, 22:15:13

they are where the air rails used to fit ive just removed mine and blocked the holes off to!

If they are not blocked off and air tight, air will be sucked in when you shut off the throttle and make your exhaust pop and bang rather like a rally car!

Title: Strange V8 cylinder heads
Post by: petergalileo on April 09, 2006, 22:19:36

Sorry ? air rails ?

Title: Strange V8 cylinder heads
Post by: JIM 2B on April 09, 2006, 22:57:02

Air is pumped in to lower emisions.