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any benefits of using ported heads for turbo use if so what would be more beneficial , mild porting with stock valves or heavilly ported with oversized stainless valves
thanks , john
use Strong Valve Springs...porting...Why you have pressure...
JD
... Toe, in a Shootout or Funnybike yes, just about anywhere else no. If you are racing and say you have the option of 10 12, 15, 18 etc. boost just keep cranking er up then, if you run out of option,start spending money on the head; although I think you should have a standard race prep.
Don't loose site of the fact that the first 6 second pass was done with a STOCK GPZ HEAD...and Boost...
but it's your MONEY...spend it where you want...
JD
before i reassemble the new motor (1307cc) gsxr oilboiler , i have the choice of 2 heads ...
A. stock valves / HD springs / mild intake and exhaust porting / 29cc's
B. stainless valves (30/26) / HD springs / radical D port intake and heavily ported exhaust / cut guides /
15.4cc's (probably overkill)&nb sp;i mostly will be running on the street and occaisionally on the strip on weekends . water / alky injection and 91-94 octane pump gas . ff40/hsr42 and will be running 10-12 psi street and 20psi for the strip . comp ratio will be 9:1 depending on the head i use .
Was that MillerEdited by: squirtOriginally Posted by Gatormaker
That's the ONE....Mark Miller @ Bristol Tenn.
JD
... Toe, by race prep I am not refering to level umpteen. Just valve job, springs (setup), retainers, maybe a set of stainless valves, unless the stockers are known to last, knock a few edges off in the chambers, match intake to manifold.
thanks guys , the mild head goes back on . just thought that if there was more flow (even with turbo)there'd be more go . so........it's safe to say that there are limits to head porting and turbo charging then , and too much flow can be hindering on a street set up ....right
A better flowing head will make a more effecient motor even on a turbo............So, it's not about limitingport work to turbo motors.........Ithink the guys are saying for what you are wanting to do.......it's probably not worth it because you may not be able to put all the hp you have now to use. More head work won't hinder you but you may not see any gains in street trim. That's what Roland was talking about in his first response above and what Gator means by wasting your money. Again..........if you were in 12x29 or 13x29 tire trim running the 1/8 and 1/4 trying to get below the 6.45 mark...................well now that's a different story. It will be a challenge for you to put what you have now to the ground. If you want.......put the mild head on and run it..............then build the head that you desire......put it on and run it!......then see how much you think it was worth.........[img]smileys/smiley1.gif[/img]
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