For the W5 lovers
What would give the best throttle response and low to midrange torque, 1.880" intake valve's or 2.020"? And also I've never said that 2.02 would not work on the 318. As far as a cylinder head specifically for the 318's is it the speedmaster? Looks like early next week is leaving for Illinois in the idea of bringing home a ride
I can tell you for a fact that port volume, valve size and throttle response arent related.
Pay attention to newer engines. Hell, look at what other guys are doing. Chrysler guys have been getting screwed because the ports on these heads are too small for almost any performance engine.
You are trying to develop your engine design and building theory based on nonsense, magazine horse crap and internet myths.
BUY THE BEST HEADS YOU CAN AFFORD, PREP THEM CORRECTLY AND BUILD YOUR ENGINE AROUND THEM.
Youll make more power, have better throttle response and it will drive better than if you use a shitty undersized head.
Now Dan, I’m giving you this for free, even though I paid out the nose to learn it. Take its value as what you are paying for it.
If Im standing around, and some throttle blipping clown is telling folks how much “throttle response“ he has free revving it I walk away because like I said, the dude is a clown.
I couldn’t care less how an engine rpm’s without load on it. How it rpm’s under load is what matters. PERIOD.
That is one flaw in water brake dyno testing. That type of dyno can not measure the engine’s ability to rpm and that is what matters.
Of course, the water brake dyno does things a true inertia dyno does not.
Im not saying this to offend you Dan, but you are trying to develop your understanding the wrong way. Are there any dyno shops near you? If so, stop in with pizza and beer and make friends with them. Then see if they will let you sit in and watch some dyno testing. Ask questions but stay out of the way. Take notes.
Then head to the drag strip and/or the local circle track and look at the numbers and see what you see. Of course you need vehicle weight to properly asses if the time slip matches power but that’s part of learning.
You should be learning how to make the engine more fuel efficient, not in MPG but in actual efficiency. How well does it burn the fuel it’s using. There are big power gains in maximizing fuel burning. Air doesn’t burn nor does it make power. Fuel does.
To that end, to burn more fuel (as efficiently as you can) you have to increase the air flow through the engine. And you still have to determine if you are burning the fuel as best you can.
And that goes for drag cars, street cars, circle track cars, virtually any car (I should say engine but you get my drift there) needs to burn fuel as efficiently as you can get it.
What most guys call throttle response is just like masturbation. It’s self gratification and that’s about it.
Now, if you want to head down the rabbit hole of driveablity then you need to get a handle on the above first.