Don Terrill’s Speed-Talk

Unless I have the dynamics of the cylinder pressure decay wrong. If the exhaust valve was not to open they would still be pressure above atmospheric ABDC. (Multiple atmospheres). Also for the last "X" number of degree BDC the crank rod angle is not very favorable to generate much turning force.

Stan

Cross section area makes sense for a straight pipe. What becomes of the effective cross sectional area when the pipe has a bend in it? My guess is this is why probing air speed is needed in relation to cross section. How effective, or accurate is probing without an exhaust stub on the port that's t...

Jon, In the engine tech section Scores From The Race Engine Challenge https://www.speed-talk.com/forum/viewtopic.php?f=1&t=58526&sid=560975b89c7526a5e8c3c1dfcbcadb53 Due to some technical glitches we got off to a slow start this week. Here are the scores to date: Ben Robey, SBF, 376 cu in,Peak HP 60...

Why is the exhaust valve lifted less than the intake? Because, in general, low lift flow is more important on the exhaust side. In general, high lift flow is more important on the intake side. Yes, a generalization. So it is not so much that you are trying to get lower lift on the exhaust. It is th...

Yes. How much more? What was max cylinder pressure and where ATDC? What was CR? What was exhaust valve size? Where is EVO at?

Stan

RevTheory wrote: ↑

Mon Sep 16, 2019 3:59 pm

Do you guys know if David made it? I've been staying out of his hair.

When I spoke with David at noon today he was at the challenge.

Stan

Carnut1 wrote: ↑

Mon Sep 16, 2019 3:18 pm

I would like an update on ST as far as dyno tested this week. I am sure I am not alone. Thanks, Charlie

X2

Stan

Still not sure what the lash ramp height has to do with lash loops. I don't know what style lash ramp is being used now, but I have not seen many constant velocity ones lately, although they do make the calculations very easy. For illustration this is a 40 degree 0.020" constant velocity and constan...

I guess a tight lash lobe would be a constraint for someone who wanted to experiment with changing lash as a signpost re the benefit of more/less duration? Bill, I don't see why trying the lash looser would be any different between a tight and loose lash cams. Now if you want to try a tighter lash ...

I guess a tight lash lobe would be a constraint for someone who wanted to experiment with changing lash as a signpost re the benefit of more/less duration? Bill, I don't see why trying the lash looser would be any different between a tight and loose lash cams. Now if you want to try a tighter lash ...

I guess a tight lash lobe would be a constraint for someone who wanted to experiment with changing lash as a signpost re the benefit of more/less duration? Bill, I don't see why trying the lash looser would be any different between a tight and loose lash cams. Now if you want to try a tighter lash ...

Experimental study on an IC engine in-cylinder flow using different steady-state flow benches

https://www.sciencedirect.com/science/a ... 6817302582

Stan

At what lash would you call a cam tight lash?

In the mid '60s I had a SBC Engle solid roller cam which had 0.012" Intake lash and 0.014" Exhaust lash.

Stan

I would put the 4 at 5.4 long in one bank and the 4 at 5.09 long in the other bank.

Stan

Someone, that would be me, has been dragging their feet. I have just sent off to David and Marvin for them to checkout what hopefully is a complete install package for the 14 Day trail and all of the other files that are needed.

Stan