Pleas hightower!! you have realy been bit of this high-velocity virus!
You can`t claim that biger inlet ports DON`T gain power!!!
There are to many engiens in the world with big ports to prove you wrong!!!
I don't claim that bigger ports wont gain power. I believe in motoman's statement that bigger ports lose power. He explains all the reason behind this statement and points out that not a single engine has proof that it is only the bigger ports working to make more power. NOT A SINGLE ONE!
Also to Paul: You seem to have a slight misunderstanding lowering the volume of your ports will not increase flow. However You can fill in quite alot without effecting flow (this space is referred to as "dead space") Flow is not the most crucial element of intake performance. Velocity has a much greater importance, to understand why everyone should read Motoman's explaination of how a 4 stroke works in real life (with all 8 phases!) another interesting note is that polishing your ports will reduce flow and velocity! the surface you want is like shark skin (An explaination to follow soon, or you could just read Motoman's stuff)
I have read the mototune pages myself.. and know the deal..
either you have only glanced over the info or you just haven't understood what you have read!
For your road use I think it will be cheaper in the end with good machine work.. Remember that this high-velocity porting is done on RACING engiens! they are rebuild after every race.. So they keep good control on the epoxy in the inlets.. there are some reliability issues conserning this methods.. I can imagien you have no plan of stripping down your engien everyother month or so
It will not be cheaper to get the porting done at all! And just to point this out the high velocity ports where tried out on normal motorcycles as well as racing ones and they have shown no reliability problems what so ever. I suggest you try it out with some epoxy, if it doesn't work you can remove it without any damage to your motor and then by all means you can take the normal path. If however it does work (It will) then if you are slightly paranoid of reliability then you can always replace the epoxy with weld material (I didn't)
And second: there are NO proof anywhere that this will work on bigger engiens.. and certainly not with the result that hightower claims to have done... hightower has a very good skill of writing, and clearly a lots of knowledge about engiens.. but still no proof of actual results.. I haven`t seen one pic of one singel nut or bolt from his garage yet..
This is unfortunately true I have no concrete proof (I didn't take many pictures when I was working on it, and the Dyno sheet I have proves nothing other than the gain ((which I could have used anything to get))) I might be taking the motor to bits again later this year and I promise to save some good pictures of the intake and exaust ports.
Originally Posted by
Matra et Alpine
Give me three good reason why not .......
Being a bastard is not cool
Being a bastard does not serve the purpose of this website
Being a bastard does not protray a wise man of your years!
good enough?
Power, whether measured as HP, PS, or KW is what accelerates cars and gets it up to top speed. Power also determines how far you take a wall when you hit it
Engine torque is an illusion.