"A woman without curves is like a road without bends, you might get to your destination quicker but the ride is boring as hell'
Im not so keen to do the intricate stuff myself. I dont really have the tools or technique.
Thanks for all the advice guys
The Datto will rage again...
Just for you Matra here is a play-by-play with commentary...
Initial info stating my intent.Originally Posted by hightower99
This is the only thing I would suggest that he do himself, as it is relatively easy, doesn't require special tools and is not a dangerous thing to do. It is also very hard to do this incorrectly.Originally Posted by hightower99
The heading for a list. the operative word here is "Know". Had I written "Do" instead you would be correct.Originally Posted by hightower99
Helpfull hints and guidelines so that if he takes it to a tuner he doesn't get screwed out of his hard earned cash.Originally Posted by hightower99
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.
Self-ownage
Go back and read wot you wrote
"YOU CAN grind the intake valve guide"
Another petrol can job, well done.
"A woman without curves is like a road without bends, you might get to your destination quicker but the ride is boring as hell'
Yes being completely different from saying maybe "You should" or something alittle more long-winded like "I suggest you grind the intake valve guide".
Besides I wrote it...
Regardless of how you decide to interpret it I have told you how it should be understood...
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.
ht, your English comprehesion sucks
Trust me, contractual law on major contracts is VERY clear about the meanings of can, should, could, would etc.
At least now it's cleared up and woudlnt' have needed a long debate if you'd just owned up first time questioned !!!!
"A woman without curves is like a road without bends, you might get to your destination quicker but the ride is boring as hell'
This is a really cool process to port and polish....
Extrusion Honing
A good finish on an intake port is a slightly rough to feel finish that is not wavy. I have heard that bead blasting an intake port is the best because it creates small vortices that create a kind of an air ball bearing effect from the port to the intake charge. I'm trying to find more information on this.
One thing I can quote is the porting article on Wikipedia which states, "Flow bench testing shows that the difference between a mirror finished port and a rough textured port is typically less than 1%".
One thing that can be said is that when porting a head, it is easier to see the variations of port surface when polished. After you have completed a port and slight polish and inspect, a good practice would be then to rough up slightly the surface or bead blast the port. But then again it is stated as a 1% variation in performance between the two.
Last edited by revetec; 04-22-2008 at 04:12 PM.
A good finish is a relatively uniform roughness. The reason is because on the intake side you want to diminish the slow moving boundary layer to help keep the fuel airbourne (by making the boundary layer turbulent). For the exhaust ports and manifold you can actually get better performance (not necessarily more flow) by polishing the ports smooth because for the exhaust you should be more concerned with maintaining laminar flow. I would think that a uniform, one-way pattern would get the best performance through the intake manifold and ports. I always think of shark skin.Originally Posted by revetec
Yes and this is important for 2 reasons. One, getting your ports polished is expensive and it will only net roughly 1% more flow and two, polishing increases the boundary layer and you will end up having fueling problems and probably combustion problems as well.Originally Posted by revetec
It stated a 1% difference in flow. Engine performance will be much more than 1% between and engine with smooth polished intake manifold and ports and the engine with uniform, one-way roughed manifold and ports.Originally Posted by revetec
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.
alot depends on the original manufacture and design that has gone into it. for instance the head on a type r is alot more refined then on a 1.3 civic. But then if you compare the efficiency of those to a ford/renault they probably alot worse on similar models. in any case try to find a trustworthy tuner with proven experience with the engine you want to modify.
i have heard alot of differences with intake ports there is alot you can change , not just with the surface, or the bore, but with the actual path the charge has to follow to reach the cylinder.
its all fun and games
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