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Search found 673 matches

by skinny z
Sat Oct 16, 2021 9:08 pm
Forum: Engine Tech
Topic: Lobe Intensity vs Durability
Replies: 36
Views: 1353

Re: Lobe Intensity vs Durability

It's fair to say that all of these components are getting stressed. Proportionally or otherwise.
It certainly giving me cause to reconsider my performance goals.
by skinny z
Sat Oct 16, 2021 1:37 pm
Forum: Engine Tech
Topic: Lobe Intensity vs Durability
Replies: 36
Views: 1353

Re: Lobe Intensity vs Durability

Now that is something I hadn't considered. Prior to finding the mangled lifter set, I was firmly in the hydraulic camp. Now you have me thinking. But... Now this is exactly why I asked this question in the first place. Based on those insights, it may be that I dial back my objectives a little just ...
by skinny z
Fri Oct 15, 2021 4:30 pm
Forum: Engine Tech
Topic: Lobe Intensity vs Durability
Replies: 36
Views: 1353

Re: Lobe Intensity vs Durability

Thanks for that Mike. I can see it's a question of risk (being longevity) vs reward (more power!). I suppose the question I have to ask myself is how much risk am I willing to take. I'm at a point where I probably won't rack up the mileage that I used to but that said this IS going to be driver. I ...
by skinny z
Fri Oct 15, 2021 1:39 pm
Forum: Engine Tech
Topic: Lobe Intensity vs Durability
Replies: 36
Views: 1353

Re: Lobe Intensity vs Durability

In the absence of having my own personal Spintron or Cam Doctor, I'm relying on some that have that equipment or the real world experience to say whether or not one lobe would survive better than the other. Going through my notes, I came across a conversation I had with CamKing by way of a cam recom...
by skinny z
Sun Oct 10, 2021 3:53 pm
Forum: Engine Tech
Topic: Lobe Intensity vs Durability
Replies: 36
Views: 1353

Re: Lobe Intensity vs Durability

Will be interesting when Mike chimes in. It will. As I mentioned those are Jones' profiles. I have to rely on the experience of others unlike the petroleum engineer come camshaft grinder who did it all. Some off the shelf lobes are bound to suit my modest goals but as any hot rodder, I don't want t...
by skinny z
Sun Oct 10, 2021 3:36 pm
Forum: Engine Tech
Topic: Lobe Intensity vs Durability
Replies: 36
Views: 1353

Re: Lobe Intensity vs Durability

Will be interesting when Mike chimes in. It will. As I mentioned those are Jones' profiles. I have to rely on the experience of others unlike the petroleum engineer come camshaft grinder who did it all. Some off the shelf lobes are bound to suit my modest goals but as any hot rodder, I don't want t...
by skinny z
Sun Oct 10, 2021 2:11 pm
Forum: Engine Tech
Topic: Lobe Intensity vs Durability
Replies: 36
Views: 1353

Re: Lobe Intensity vs Durability

3V Performance wrote: Sun Oct 10, 2021 2:07 pm It's just not that black and white from my experiences.
This I'm learning.
Case in point is what I have compared to what I need for a change in application and that answer doesn't appear easy to come by.
by skinny z
Sun Oct 10, 2021 1:46 pm
Forum: Engine Tech
Topic: Lobe Intensity vs Durability
Replies: 36
Views: 1353

Re: Lobe Intensity vs Durability

I could've sworn Mike said you're usually better off with lobe lift and less rocker but that may have been solely for the sake of keeping the plunger happy. Everything has it's little happy zone though so I'm sure at some point, side load becomes a bigger issue than plunger stability. I'm curious t...
by skinny z
Sun Oct 10, 2021 1:39 pm
Forum: Engine Tech
Topic: Lobe Intensity vs Durability
Replies: 36
Views: 1353

Re: Lobe Intensity vs Durability

From my spintron experience ( we own 2 ) the problem is EVERYTHING affects everything in a dynamic state. Sim's can help with understanding but real world most always shows unwanted compliance or deflection that was never figured into a sim program. The results very AND are always changing with rpm...
by skinny z
Sun Oct 10, 2021 12:52 pm
Forum: Engine Tech
Topic: Lobe Intensity vs Durability
Replies: 36
Views: 1353

Re: Lobe Intensity vs Durability

That's what I figured Stan. I can't say that I'm one to integrate that level of equipment into my shop in as much as I'd like to. The data would be interesting though. Working in a machine shop/ manufacturing facility, I've access to all kinds of measuring equipment like our several CMM's but they'r...
by skinny z
Sun Oct 10, 2021 11:56 am
Forum: Engine Tech
Topic: Lobe Intensity vs Durability
Replies: 36
Views: 1353

Re: Lobe Intensity vs Durability

hoffman900 wrote: Sat Oct 09, 2021 3:14 pm You need someone who knows what they're looking at...
Still agreed on this.
Those profiles posted are from the same manufacturer's catalog and they have plenty of representation here at ST.
by skinny z
Sun Oct 10, 2021 11:51 am
Forum: Engine Tech
Topic: Lobe Intensity vs Durability
Replies: 36
Views: 1353

Re: Lobe Intensity vs Durability

I know the CamProPlus measurement and looking at the derivative charts is advanced, but it's the only way to answer your question accurately. You don't need to be a math wizard to see which one has lower peak acceleration and where, and has the lowest jerk value. Am I missing something with CamPro?...
by skinny z
Sat Oct 09, 2021 5:13 pm
Forum: Engine Tech
Topic: Lobe Intensity vs Durability
Replies: 36
Views: 1353

Re: Lobe Intensity vs Durability

Looking at Cam Dr. I'm not sure if it's the stuff of the hobbyist. Which is what I am. That doesn't mean I don't appreciate all of the science. I'll look into it further. That said, one excellent explanation with respect to ratio vs lobe lift I've come across was posted by CamKing . Ignoring lobe de...
by skinny z
Sat Oct 09, 2021 3:23 pm
Forum: Engine Tech
Topic: Lobe Intensity vs Durability
Replies: 36
Views: 1353

Re: Lobe Intensity vs Durability

What I have learned in those numbers don't tell you really how it's going to impact the valvetrain. You need someone who knows what they're looking at to see the derivatives (Cam Doctor level at least). Plenty of old school, low intensity cams out there that actually have crazy acceleration and jer...
by skinny z
Sat Oct 09, 2021 3:17 pm
Forum: Engine Tech
Topic: Lobe Intensity vs Durability
Replies: 36
Views: 1353

Re: Lobe Intensity vs Durability

I would check with the cam company on that higher intensity lobe. They should know if 1.6 RR were in the design parameters. Some lobes are designed to be RR specific or tolerable. With a solid I would go for it, but a Hyd might not like the little extra the 1.6 RR puts on it. A good Cam Mfg should ...