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General Category >> Rubber Side Down! >> So... Cylinder Head Porting?
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Message started by Smokestack on 02/12/13 at 17:32:21

Title: So... Cylinder Head Porting?
Post by Smokestack on 02/12/13 at 17:32:21

Who's done it? How hard was it to do, or did you have it done? Was there a noticeable difference in performance? I'm about to rip into the top end to cram a bunch of go-fast stuff in, and this seems to be one of the last things ya can do.

Anyone wanna help a guy out?

Title: Re: So... Cylinder Head Porting?
Post by Oldfeller on 02/12/13 at 19:05:33

Lancer and others have done it with somewhat indeterminate results -- it likely did something for them at WFO but anything less than WFO is hard to determine what the benefit actually was.

Doesn't mean there wasn't any.

Title: Re: So... Cylinder Head Porting?
Post by Serowbot on 02/12/13 at 22:21:17

There are many degrees of head porting,... from smoothing cast marks to gasket matching, to computer flow testing....
I've done a few cars, and bikes... Nuttin' fancy,...
If you want to do a little,... that shouldn't hurt anything,..
get a Dremel, or I also use a ball shaped cutting bit in my drill,... (do only the exhaust,... roughness in the intake can more helpful than harmful, so leave it alone)... block the exhaust valves by stuffing some rag or paper towel deep in the hole, so no shavings get back there ... then gently, smooth the exhaust port passages,.. there is a torque hump that bumps up in there across the bottom of the hole,.. don't grind that away, just smooth it... then,...open up up the that outer ring to closer match the exhaust gasket and header pipe... (vacuum it out when you're done)...(doing too little is better than overdoing it)...
Go too far, and you might screw something up...

Remember,.. you can take it off,.. you can't put it back...

I did gasket matching, and smoothing on a couple of Mustangs, years ago, and got a small, but noticeable improvement...
On the Savage I did similar work,.. and results aren't really noticeable...
.. but,.. being conservative,.. I'm quite sure I haven't done any harm, ...and it is likely that there is a tiny improvement, if not perceptible...
... or not... ;D... (but, I know I've done it, and I don't trust letting anyone else try to prove they can do better, by doing more)...

Keep it safe... or you can do more harm than good...
I just suspect, that there's no harm in trying to gently correct the inefficiencies of mass produced casting...

JMHO... I'm no expert. just a DIY guy...
I do pride myself on not perceiving illusionary performance results...
Don't expect much... if your bike is breathing pretty good, and jetted pretty good,... a little smoothing and porting might allow a bit more potential...

Title: Re: So... Cylinder Head Porting?
Post by Gyrobob on 02/13/13 at 03:28:59

Extrude Hone.

Costs about as much as a proper porting job, but doesn't change the shape the engineers wanted all that much,.. it just puts a smooth satin finish on everything that touches the flow,... takes out the casting ridges, etc.

See reply # 4 here:

http://suzukisavage.com/cgi-bin/YaBB.pl?num=1357947126/4#4

Title: Re: So... Cylinder Head Porting?
Post by Smokestack on 02/13/13 at 13:34:50

Thanks all. Just what I needed.

Title: Re: So... Cylinder Head Porting?
Post by justin_o_guy2 on 02/13/13 at 15:57:24

What else has been done? There Are much easier things to do. Things that, should they not work out well, can be reversed.
Whats your skill level?
Have you considered doing a test on it first? See how it runs on a dynamometer? YOu mite be happy enough with a better exhaust & a good tune on the carb.