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Search found 2928 matches

by Stan Weiss
Wed Nov 25, 2020 6:42 pm
Forum: Engine Tech
Topic: Performance improvement from reducing rod journal size
Replies: 18
Views: 861

Re: Performance improvement from reducing rod journal size

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...
by Stan Weiss
Tue Nov 24, 2020 11:32 am
Forum: Engine Tech
Topic: Performance improvement from reducing rod journal size
Replies: 18
Views: 861

Re: Performance improvement from reducing rod journal size

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 ...
by Stan Weiss
Tue Nov 24, 2020 10:42 am
Forum: Engine Tech
Topic: Performance improvement from reducing rod journal size
Replies: 18
Views: 861

Re: Performance improvement from reducing rod journal size

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...
by Stan Weiss
Sun Nov 22, 2020 11:12 pm
Forum: Engine Tech
Topic: Big Issues with Cylinder Pressure (DCR)
Replies: 84
Views: 2162

Re: Big Issues with Cylinder Pressure (DCR)

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...
by Stan Weiss
Sat Nov 21, 2020 4:38 pm
Forum: Engine Tech
Topic: duration @ .050"/ .200"
Replies: 29
Views: 2235

Re: duration @ .050"/ .200"

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
by Stan Weiss
Wed Nov 11, 2020 3:40 pm
Forum: Engine Tech
Topic: 80’s era 351w heads
Replies: 22
Views: 781

Re: 80’s era 351w heads

Steve,
Have a look at this thread.

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

Stan
by Stan Weiss
Sat Nov 07, 2020 11:21 am
Forum: Engine Tech
Topic: Got CamDR-Cam Pro Plus files?
Replies: 17
Views: 8273

Re: Got CamDR-Cam Pro Plus files?

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
by Stan Weiss
Tue Nov 03, 2020 12:23 pm
Forum: Engine Tech
Topic: Gliddens heads!
Replies: 24
Views: 1614

Re: Gliddens heads!

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

Stan

Cleveland_Flow.gif
by Stan Weiss
Mon Nov 02, 2020 11:39 am
Forum: David Vizard forum
Topic: IOP / FLOW Program
Replies: 0
Views: 158

IOP / FLOW Program

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...
by Stan Weiss
Wed Oct 28, 2020 11:02 pm
Forum: David Vizard forum
Topic: EQ – all-time best BBC iron heads?
Replies: 23
Views: 1368

Re: EQ – all-time best BBC iron heads?

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...
by Stan Weiss
Wed Oct 21, 2020 11:51 pm
Forum: Engine Tech
Topic: duration @ .050"/ .200"
Replies: 29
Views: 2235

Re: duration @ .050"/ .200"

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
by Stan Weiss
Thu Sep 10, 2020 12:23 pm
Forum: Vintage/Classic/Historical Engine Tech
Topic: My next debate: origins of the canted valve Ford cylinder head.
Replies: 42
Views: 1367

Re: My next debate: origins of the canted valve Ford cylinder head.

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 ...
by Stan Weiss
Wed Sep 09, 2020 11:49 am
Forum: Engine Tech
Topic: Cam lobe decel ramp - valve life?
Replies: 32
Views: 1558

Re: Cam lobe decel ramp - valve life?

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
by Stan Weiss
Mon Sep 07, 2020 1:30 pm
Forum: Engine Tech
Topic: Cam lobe decel ramp - valve life?
Replies: 32
Views: 1558

Re: Cam lobe decel ramp - valve life?

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
by Stan Weiss
Sun Sep 06, 2020 7:14 pm
Forum: David Vizard forum
Topic: Seat angle shoot-out
Replies: 10
Views: 718

Re: Seat angle shoot-out

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