Re: Cylinder head flow - What is crucial in a stocker?
 

LOL! :D

On a small Cessna airplane, waxing the exterior increased the airspeed by 3.5 MPH

Re: Cylinder head flow - What is crucial in a stocker?
 

Dear SSDiv6,
I will throw this add up to your paint preparation subject and just for discussion or the fun of it (with no disregard to your point) an even if this isn’t in direct relation with the title subject.
I was at the Napierville Nationals Open Series few years ago and I was taking a close look at the NHRA “open tech barn” at the back of the tower. A certain stocker had his engine check for the approval of new E.T. record, for the second year in a row.
While waiting and checking the Tech’s work, the car parts, suddenly a small detail pop-up… The golf ball effect…The car had a good or important orange peel surface…

Re: Cylinder head flow - What is crucial in a stocker?
 

I was once told by a racer that after he had a vinyl top put on his car he picked up MPH...?...
Fact?... or fiction?...

Re: Cylinder head flow - What is crucial in a stocker?
 

Earlier in the thread somebody mentioned price. I bought my heads from another racer. So I don’t know. But is that accurate $5,000 for new stocker heads and $1,800 for an intake? And is that assuming you supply them with good cores to start with? I’m just curious. If you think about it. Even if you knew how to do it and what do do. By the time you bought all the equipment to do it. You’d have to do probably 100 sets of heads or more to break even on used equipment. So in the end for most of us it’s still cheaper. Although expensive. Plus you theoretically get all their R&D as things advance over time. Again I’m just curious at some point I’ll get a new set. But for now these ones I have will have to do. If you don’t want to say here. Feel free to PM me.

Re: Cylinder head flow - What is crucial in a stocker?
 

Air is different than water, or is it? anybody that messed with overpowered outboard boats knows that primer is faster than smooth and shiny on the pad and the lower unit, 4,5 or 6 mph and how you go from stuck in the upper 90's to breaking triple digits......that "theory" that has been proven also applies to cylinder head ports...but what do I know? the "experts say, size matters more", not flow

Re: Cylinder head flow - What is crucial in a stocker?
 

You missed one, velocity. CFM, CSA, and Velocity are like the 3 sides of a pythagorean triangle. If you know any 2 the 3rd is easily calculated.

Stan

Re: Cylinder head flow - What is crucial in a stocker?
 

Stan I wouldn't argue anything about machine work with you, but I disagree on the HP needed. Maybe in a lightweight car. But in my 40 plus years of running stockers I'd say more like 15 to 18HP. The point I was going to make if someone can pick up .7 with an intake and heads you must have some pretty bad heads to begin with. Just a few years ago it was 8hp difference with an intake on a small block stocker. If someone is getting much more than that I would love to see it in tec at Indy.
Using the 15 hp number to go .7 you would need to pick up 105hp. That would be 97 hp from head minus the intake. I think I use one of the best out there but if you have someone that can get me 100 hp from a set of heads please let me know. BP

Re: Cylinder head flow - What is crucial in a stocker?
 

Barry,
I don't have time to optimize these simulations.


60 Foot ET = 1.3610
330 Foot ET = 4.0108
1/8 Mile ET = 6.3058
1/8 Mile MPH = 106.6345
1000 Foot ET = 8.2990
1/4 Mile ET = 9.9840
1/4 Mile MPH = 134.2295

60 Foot ET = 1.3746
330 Foot ET = 4.0519
1/8 Mile ET = 6.3693
1/8 Mile MPH = 105.5199
1000 Foot ET = 8.3839
1/4 Mile ET = 10.0866
1/4 Mile MPH = 132.8920


Race weight with driver 3375 #. 17 HP difference


Stan

Re: Cylinder head flow - What is crucial in a stocker?
 

Thanks Stan, it looks like you have a couple of my times slips. Excluding 60-foot times. And it was about 16hp difference. BP

Re: Cylinder head flow - What is crucial in a stocker?
 

Stan I just sold my business. I'm helping with the transition but I'm only working about 20 hrs. a week. Down from 10hrs a day 7days a week. I had 19 employees. What a weight off my shoulders. I'm 66 and feel I should've done it 2 years ago. Don't wait too late. Get out while we have our health. BP