steve wilson Posted June 5, 2003 Share Posted June 5, 2003 What do they do to a cyl. head to make it gas flowed ? Quote Link to comment Share on other sites More sharing options...
Mark Stanton Posted June 5, 2003 Share Posted June 5, 2003 Very basically it has it's head ported and "smoothed out" to ease gas flow - it will have metal removed from it and balanced - also its outlet will be profiled to suit the manifold Certainly not a job to be undertaken by a novice - although no doubt someone with the engineering skills will be along shortly to say how they done it (hat doffed) Mine was done by Mike Tanski at Ferriday - I've seen some of his work and its superb Quote Link to comment Share on other sites More sharing options...
steve wilson Posted June 5, 2003 Author Share Posted June 5, 2003 Why isnt this done when they are made. Im not thinking of doing it, Id seen it alot and just wondered what it meant. Quote Link to comment Share on other sites More sharing options...
DodgeT Posted June 5, 2003 Share Posted June 5, 2003 Production costs. A standard head is usually a cast item, whereas the porting process (basically smoothing the cast surface) can only be done by hand/machine. + with varying tolerances on the cylinder head & inlet manifold / exhaust manifold, the ports never match up perfectly as standard, again, this has to be done by hand. HTH Quote Link to comment Share on other sites More sharing options...
steve wilson Posted June 5, 2003 Author Share Posted June 5, 2003 Thanksguys Quote Link to comment Share on other sites More sharing options...
Nick M Posted June 5, 2003 Share Posted June 5, 2003 Another reason (although cost is the main driver) is that modern engines have to meet ever stricter emissions tests and has to be fuel efficient and so the design of the cylinder head is often optimised for this rather than all out power. If an engine (or the head) can flow more air then you can add more fuel to make more power. The downside is higher emissions and more fuel consumption which, for your average rep-mobile, is probably not a good thing... Some engine were designed to produce power from the outset - the Vauxhall 2.0 XE for example - and it's less critical to play with the head on these engines than, say, a K series or a Xflow. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.