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Old 03-24-2013, 06:40 PM   #144
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Join Date: Feb 2007
Location: Australia
Posts: 1,817
My Ride: E46 M3 Turbo
Originally Posted by Twin_Turbo_S54 View Post
To rev 9000-9100 rpm I have produced my own retainers, that is bought raw titanium, cnc cut, test fit, heat process.... first step was custom made, actually home made retainers.
Lower retainers are not titanium, they are steel.

Valves are custom made, learnt a hard lesson, when a off the shelf valve let go at 8600 rpm one day, causing a total loss of engine. From there on I decided to get custom valves, custom means material and weight.

As of today, I have 5 different sets of camshafts. Still 1 set of them not tested.

DLC coated rocker arms.

Vanos is on the car, vanos delete caused loss of torque, tested back in 2007.
I know what you mean about off the shelf not being strong enough. I had a exhaust valve and lock actually pull through a titanium retainer.

You need to do a lot to these engines to push limits with them. One of the reasons I'm going LSx conversion

BMW E46 M3 Turbo 570rwhp @18psi (old setup)
BMW E46 M3 LSX 427ci 800hp N/A
Ultima GTR LSX 440ci 800hp N/A
VY SS Ute Turbo 1004.6rwhp @ 28psi E85
Ford Escort Mk2 2JZGTE 600rwhp @14 psi
04 Yamaha R1 154.3rwhp
ISUZU FZR550 tilt tray (GT35 Turbo)
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