Don Terrill’s Speed-Talk

Interesting stuff, although I have to admit I'm not exactly sure what Stan's spreadsheet is telling me . In my case, it's the new / next build for my Mopar. Stock rod journal size is 2.375 and, as mentioned above, it's pretty common to switch to BB Chevy rods with 2.20" journals. However, most peop...

It reduces bearing speed and it reduces the Bob weight quite a bit. If you consider it, the big end of the rod can be smaller, therefore lighter. The bearing is now smaller, and lighter. The rod pin is now smaller...and lighter. That means rather than Swiss cheese the counterweights you can reduce ...

Let say you are talking about a V-8 and 4 rod journals. If you remove .1 pound (45.36 grams) from each journal that is a total of .4 pounds. Next we next need to look at the stroke. Let use 4". We can look at different RPM but must also decide on the engines acceleration rate. I am going to use 3000...

Hi, · Cam: With 1.6 ratio rockers has 224/230 @.050 and .536/.544 lift. 110-degree lobe separation/ 106-degree intake center line . (pt # 8-423-8) To get more data, I ran cranking pressure tests yesterday which confirmed the problem. On a motor with maybe :10 run time, and a squirt of oil in the cy...

fastblackracing wrote: ↑Fri Nov 20, 2020 11:55 pm

frnkeore wrote: ↑Fri Nov 20, 2020 5:32 pm Mike, this is the am that I'm having made.

What does the area represent and how is it figured?
Thx.

The area is the area under the lifter raise curve. It is broke down / shown from a given start to stop lift point.

Stan

Steve,
Have a look at this thread.

2 heads better than 1 - power porting E7TE iron.
viewtopic.php?t=48390&start=1

Stan

Yes, I know this thread is from 2005. All that means is there are people posting now who were not posting then.

So does anyone have any CamDR or Cam Pro Plus files that they are willing to share?

Stan

Steve,
Here are those numbers plotted against some numbers from a Dr J ported 4V closed chamber head.

Stan

David has posted a number of graphs from the IOP / FLOW program. If anyone would like to check it out with some hands on time. This is the install package for a 30 Day version of IOP / FLOW. It is in a zipped file that requires a password to Unzip. Please PM me to get the password. If it turns out t...

SERIOUSLY thinking about purchasing a.set of these heads for somewhat of a street sleeper project. Anyone know if there Is there anyone out there with a CNC program for these heads or who is working these heads by hand? Two places to go to thjat I know can do a good job right down to getting the be...

BlitzA64 wrote: ↑Wed Oct 21, 2020 8:53 pm I would ask the same question as the original post. I have two cams with 261 @.050 with 3* difference @.200

With the same or different max lobe lift?

Stan

Funny you mention that, I was watching Uncle Tony’s Garage last night. The episode was regarding his thoughts about the small block Mopar (LA). In that episode he picks up a D4 hemi head and he mentions that the ports in that head and the D5 were “Weslake” ports. Just a quick quip I don’t know any ...

CamKing wrote: ↑Wed Sep 09, 2020 10:31 am

Nut124 wrote: ↑Tue Sep 08, 2020 3:28 pm
What kind of max velocity limits are being recommended for valve seating?

You want the velocity at the lash point to be under .0008" per degree. If it's over .001", I would worry.

Mike,
Do you ever look at valve seating velocity in fps @ shift point RPM?

Stan

Can you get a 0.016" feeler gauge between the base circle and the bucket and then measure? If so, and you can post degree wheel readings and lift number then we can calculate what the velocity is at different points.

Stan

Remember at lower lift the more you increase the valve seat angle the smaller the actual flow area between the valve and the seat gets.

Stan