Subiesport Magazine - August/September 2008 - (Page 88)

TECH: REBUILD YOUR HEADS How to rebuild your heads and install performance camshafts CAMSHAFTS ARE AN important engine component. They determine how much air and fuel your engine can ingest and expel. They can determine your power band, and they can also be a limiting factor when trying to build a big power car. Stock cams are generally designed to allow for smooth idle and a broad daily drivable power band. However, stock cams can act like a choke point for a big turbo, especially in the upper rpm ranges where you really want the cams to open up a bit more to flow all that air and pressure your turbo is pumping out. Last issue we showed you how you could swap out your pistons for stronger forged slugs. In this issue we will show you how to upgrade your mildly lumpy cams for some serious bump sticks. The engine in question is an EJ20 out of a WRX that is destined for a turbo conversion in the 1999 2.5RS of our Technical Editor, Tim Bailey. Already, Tim has built up the bottom end with a set of Wiseco forged pistons and K1 Technologies forged rods. Since Tim can’t leave well enough alone, we contacted Brian Crower (BC) for a full set of titanium 88 SEPTEMBER 2008 retainers, high-tension valve springs and their Stage 3 cams. The process of swapping out all these parts is fairly straightforward and most of it you can do in your garage if you have the right tools, although you will need some specialized ones. Also, you need to have your heads pressure tested, the valve stem seals checked for trueness, and the heads cleaned. Any machine shop can do this and it is relatively cheap. You will also need a valve-spring compressor, some valve lapping compound and a valve lapper. You can have your valves reground and lapped at the machine shop, again for a fee. We decided to go a bit budget and see just how far we could get in the garage, though we did employ a drill press and a few other less-common home-shop tools. If you do not have a drill press, you might be better off having the machine shop check the trueness of your valves, stem seals and machine your valves and head to match. In addition to cams, you will need new or reconditioned valves, valve springs, valve spring seats, retainers and retaining clips, and buckets of varying sizes. http://www.briancrower.com http://www.briancrower.com

Table of Contents Feed for the Digital Edition of Subiesport Magazine - August/September 2008

Subiesport Magazine - August/September 2008 Features Contents Editor Letters Readers' Rides New Products Subaru News 2009 Impreza WRX East Meets West Shoebox Sleeper Bettering the Breed ...Even the Kitchen Sink WRC Rally Greace WRC Rally Turkey Rally America: New England Rally America: STPR 2008 STI Open Class GCRallyX R4 Where to Buy Subiesport ICY Racing E85 & Methanol Rebuild Your Heads Budget Building Ad Directory Spotted!

Subiesport Magazine - August/September 2008

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