Don Terrill’s Speed-Talk

Posting this in response to both flowbench threads. Go to Bruce's Flowbenchtech site and sign up. See what he and the site has to offer and start reading. For under 1000 bucks I built this complete with PTS DM and probes. 600+cfm @28/400+cfm @36" benchpic.jpg It can also do this, through an int...

Ok , i am currently porting a set of RHS 235 heads . The exhaust ports are square , and VERY small ! I mocked up a D port gasket and it looks like a nice choice for porting . BUT ,,,,, i think the D port may be a little tall for most headers ??? i will be using a set of HOOKER SUPER COMPS .. will t...

I try to always set the throat on the exhaust no larger that 88%. I have tried larger but did seem to flow as well (maybe it is just me). I don't know if that helps in some formulas. I don't even know if that is the thing to do to make the best power. I would like to know how you came up with the r...

Put your calculations online, please do not hold us in suspense as being the next GOD. Stuart. Let me mention somthing, calcultions in PHYSICS hav not changeded At least as far as I know, and I have a couple that are prtty good too. Bro, I don't think that way. They are rough and still have tweakin...

My problem is the throat size on my exhaust is already 90% of a 1.850 valve. If I put a 1.800 valve in, my throat (just below the bottom cut) is still the same size and now it becomes 92.5%. I follow all of your intake side mach numbers and from that, it would appear that I am fairly close to where...

Eric, can you give me an "example" engine design you would be working on for this exhaust. I need bore stroke rpm current intake head flow current intake valve size current intake MCSA or throat size. This will get exhaust related. Thanks Bore 4.310 or 4.5 4.25 Stroke 7000rpm Flows 410cfm...

I have an example for you. This topic is right up my alley right now. BBC 4.625 bore 4.75 stroke Edelbrock Big Victor spread port heads 2.450" I 1.850" E Sheet meat 2 X 4 induction Pro-street application but looking to very much maximize track performance as well. Going to run titanium on...

Eric, can you give me an "example" engine design you would be working on for this exhaust.
I need
bore
stroke
rpm
current intake head flow
current intake valve size
current intake MCSA or throat size.

This will get exhaust related.
Thanks

This thread made my head hurt. You all want to see differences between benches using a head? How about we all show up at one place to one bench but each holding their own example of say AFR's 235 sbc head. I will bet money that most of them will flow different. Thats where the differences lie, in th...

I must be nice working with good family. I'm sure others may also wonder this. Are you still going to hold any "classes" in Ohio? Just curious.

With all being said which are only a few parts of the equasion, there are answers to all the questions. Each new discovery helps put the puzzle together. Even though there is "chaos", these events are not random. Everything follows one form or another of physics, no matter how fast or slow...

Know I now I'm going out on a limn by saying "Stagnant Fuel " and this is my opinion.... John Yelich I don't think you're going out on a limb. :) The fuel MUST stop between valve events. Since that makes up the majority of every engine rotation, it makes sense that, over time, small amoun...

eric, water will give you patterns and help your understanding. It does replicate burn patterns. It's cheap, won't explode and can teach you a lot. I'm still waiting to hear from the guy who has wetflow so refined that water is no longer useful. The one thing I need more info on is the lift amount/...

Did you notice how the port went into swirl mode when the port velocity rose going to .550" lift" ? Begins around the convergence point and approaching .22 to .25 LD on these. MMMMMMMmmmm. Also, take note watching the .300 vid. 3/4 of the way through, there was a quick separation when I f...

I been thinking if when using alky. Say a vortex with gas amounts is small and out of the way from the plug. Adding the amounts found with alky can increase the size of the liquid vortex becomming too close to the plug. And/or the change in airspeeds from such a saturated port may "move" t...