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Forum: Pontiac - Street 05-28-2019, 03:10 PM
Replies: 327
Views: 27,801
Posted By Stan Weiss
The green line show a generated valve lift curve...

The green line show a generated valve lift curve for the UD H5. The blue line show a generated valve lift curve for the UD H5 with 0.007" lash (equal to 0.045" lifter raise - Adv duration with 1.5:1...
Forum: Pontiac - Street 12-31-2018, 03:27 PM
Replies: 327
Views: 27,801
Posted By Stan Weiss
These lobe lift files are not from measuring an...

These lobe lift files are not from measuring an actual cam but I computer generated them form listed specs. The graph shows valve lift for a comp 3115 lobe with 1.5:1 and a 041 with 1.65:1 both @ 110...
Forum: Pontiac - Street 12-31-2018, 12:44 PM
Replies: 327
Views: 27,801
Posted By Stan Weiss
Steve, Looking at that article I have to say...

Steve,
Looking at that article I have to say the shift RPM looks low to me for that cam timing.

Stan
Forum: Pontiac - Street 12-29-2018, 04:53 PM
Replies: 327
Views: 27,801
Posted By Stan Weiss
I think that this generated lobe lift curve is...

I think that this generated lobe lift curve is very close to an ISKY 292 - 244 0.050 cam

Stan

Rocker_Arm_Ratio_1.5:1

Intake_BTDC_(IVO_to_TDC)_=_1.451
Intake_Pumping_(TDC_to_BDC)_=_52.588...
Forum: Pontiac - Street 12-29-2018, 04:19 PM
Replies: 327
Views: 27,801
Posted By Stan Weiss
I would have liked to see one more test. A higher...

I would have liked to see one more test. A higher ratio intake rocker arm on the flat tappet to somewhat equal out the valve lift and 0.200 duration to the roller.

Stan
Forum: Pontiac - Street 12-29-2018, 02:18 PM
Replies: 327
Views: 27,801
Posted By Stan Weiss
Cliff, While peaks are one thing, averages are...

Cliff,
While peaks are one thing, averages are another. Would you happen to have both dyno sheets?

Stan
Forum: Pontiac - Street 12-20-2018, 01:08 PM
Replies: 327
Views: 27,801
Posted By Stan Weiss
What was the logic installing that cam at 105 ICL...

What was the logic installing that cam at 105 ICL verses 108 ICL to start with?

Stan
Forum: Pontiac - Street 12-19-2018, 01:37 PM
Replies: 327
Views: 27,801
Posted By Stan Weiss
Did you ever do a cranking compression test on...

Did you ever do a cranking compression test on the engine?

Why didn't you try and retard the cam a few degrees to see if it fixed the problem?

Stan
Forum: Pontiac - Street 04-06-2018, 10:49 AM
Replies: 327
Views: 27,801
Posted By Stan Weiss
I do not know about this particular combination,...

I do not know about this particular combination, but there have been times when reducing the piston to head clearance while upping CR has made it less octane sensitive.

On the cam. The manufacture...
Forum: Pontiac - Street 04-06-2018, 12:40 AM
Replies: 327
Views: 27,801
Posted By Stan Weiss
Thanks. 2 engines with the same CR and...

Thanks.

2 engines with the same CR and cranking compression can behave differently based on other factors. What is the piston to head clearance?

Also retarding the cam 4 degree should lower...
Forum: Pontiac - Street 03-31-2018, 01:19 AM
Replies: 327
Views: 27,801
Posted By Stan Weiss
X2 Also doing you ever do a cranking...

X2

Also doing you ever do a cranking compression test?

Stan
Forum: Pontiac - Street 03-28-2018, 09:31 AM
Replies: 327
Views: 27,801
Posted By Stan Weiss
Have you done a cranking compression test? if so...

Have you done a cranking compression test? if so what is it?

Have you called and talked with Chris about this?

Before I changed / bought a new cam. I would try this in at 109 icl.

Stan
Forum: Pontiac - Street 01-22-2017, 01:04 PM
Replies: 327
Views: 27,801
Posted By Stan Weiss
The point is that it is the valve lift curve that...

The point is that it is the valve lift curve that counts. So you need to find a cam guru that designs the valve lift curve needed for you combination. He will then grind a cam lobe that will give you...
Forum: Pontiac - Street 01-22-2017, 01:03 PM
Replies: 327
Views: 27,801
Posted By Stan Weiss
Cliff, So of us do not need to Google. We also...

Cliff,
So of us do not need to Google. We also have very knowledgeable friends. Then this could almost like the old my brother can beat your brother up. :)

Stan
Forum: Pontiac - Street 01-21-2017, 02:53 PM
Replies: 327
Views: 27,801
Posted By Stan Weiss
Steve, No question about it. For some it is...

Steve,
No question about it. For some it is much more complex then that. :D

Stan

PS - me to
Forum: Pontiac - Street 01-21-2017, 02:51 PM
Replies: 327
Views: 27,801
Posted By Stan Weiss
If anyone wants to play around. This is close to...

If anyone wants to play around. This is close to what Chris will get for 0.050" intake duration

Estimate Cam Intake Duration Needed @ 0.050"
http://www.magneticlynx.com/carfor/calchpm.php

Stan
Forum: Pontiac - Street 01-21-2017, 02:43 PM
Replies: 327
Views: 27,801
Posted By Stan Weiss
Steve, Actually many years ago David Vizard...

Steve,
Actually many years ago David Vizard worked with Harvey Crane and ran those and many different dyno test (1000's) using SBC engines. The results of those test was the original bases of...
Showing results 1 to 17 of 17

 
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