Lloyd klem wrote: ↑Fri Dec 02, 2022 10:22 am
Erland Cox wrote: ↑Fri Dec 02, 2022 6:48 am
Lloyd klem wrote: ↑Thu Dec 01, 2022 7:35 pm
There we go ,the more we do the math the less we know! Experience,r&d is everything.I have read so much expert knowledge that is no where near what goes on.People think they find something,and that's cool.Most things do not duplicate enough for us to understand.Thats why I only do what intrigued me ,I will never work on anything again that someone thinks they figured out.What happens at one rpm does not at another.The only guys that impress me have general knowledge of race engines,can produce a decent Dyno sheet and bring that to life at the track etc!!
It is a good start when you start from scratch but for developing max power you have to work on the dyno.
But an understanding on what goes on helps you to choose which way to go and saves time.
Do you understand how the physics in a manifold works?
I just want to understand all the things I see on a dyno.
By the way. 1996 I did a set of heads for an NHRA P/S engine here in Sweden, the first and last I ever did.
I had the manifold and the pistons but I did everything in between.
Dart Oldsmobile heads. 7.28-190.
The fastest American built car ran 7.16-196 something.
This is when they used 4.84 bore centers.
At a point I got tired off throwing parts on cars and tried to get an understanding of what is going on.
The gas flow and waves in the ports are very complicated because they affect each other.
Not even a perfect sim can keep up with reality but it can help you understand better.
Sadly I am to old to be any good with computers and I rather work on the dyno which by the way also has a computer though a less troublesome one.
But today I know where I would start on that P/S engine to make it better, valve gear.
Erland
Erland
I will start with no I'm not any math or physical science expert.I use general spread sheets I have came up with for length,size ,taper etc.I have worked on engines from about every style of racing at some point in my life.I worked with a guy for years ,when I left there we had dynoed somewhere near 2000 different engines.The thing we worked on hardest was looking at what an engine told us after it ran.We learned what to fix by color of piston on dome side and underside.What chamber and ports look like,where or if there was reversion.I work on heads and manifolds yet today.Most stuff that comes to me is already pretty well perfected design.But guys always want more.I don't get caught up in all the physic or math BS,in fact I find 80 percent of manifold or head problems are not physical outlay or design.I find that most result back to poor ring seal,valve jobs and or cam events picked.Btw I was working on prostock stuff in mid 90s as well.I would say by 96 nobody in America that was qualifying had non 4.900 Bs stuff.In fact one of guys we worked on his stuff probably was one of the last guys to qualify with 4.840 stuff.In 95 one team I worked with was running 7.11-7.12ish with at that time was 1325 hp and 785 ft lbs roughly as I recall.I really admire the guys caught up in the all the math aspect of race engines.I don't have time for that personaly.But I have fixed many of the guys that think they know it all's engines.Maybe it comes down to I out guess them.lol.
I started out with 2 stroke bikes as a kid of 13 knowing nothing.
I bought my first Chevy2 when I was 16 and had my first summer job.
When I was 17 I had another Chevy2 with a 331, Muncie M21 and 3.36 gears.
It was all the tires could take dropping the clutch at 6000 rpm.
I read Jenkins and dreamed about smallblock tuning.
Then I did some real drag racing with a 305 in a 40 Willis 4 door. 302 + .030"
After that I started streetracing with a Dodge Charger 68 and in that car I did a lot of manifold and cylinder head testing.
Just plain old cast iron heads and some where welded and epoxied.
Got around 625 hp out of a streetable 440 and used Nitrous on top of that.
In the 80:s I quit my job porting heads for another company and have been self employed.
I built my flow bench after an article in Car Craft and trying to figure out flow got me interested in math.
So I went to school for 2 years to understand more about math and physics.
But I am mostly self taught by testing but at the same time I alwaays have had an interest in deeper understanding.
I just must know why.
I have street raced, drag raced, mx:d, run bikes in roadracing and now I road race cars.
And I love it.
I have had so many cars that it would take hours to write about all of them.
http://www.topplocksverkstan.se/bilder/ ... azine1.jpg
http://www.topplocksverkstan.se/bilder/ ... azine2.jpg
Erland