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Search found 1435 matches

by skinny z
Mon Sep 26, 2022 12:12 pm
Forum: Engine Tech
Topic: What was Chevrolet thinking ?
Replies: 27
Views: 1068

Re: What was Chevrolet thinking ?

Skinny. in all due respect you are just not going to learn what needs to be learned by computer sim ing this stuff to death.... You need to get in there and get dirty. Cam in motor , in car... Car down ¼ mile... Time slip yeee ha or wow What happened :( ha ha No disrespect taken F-BIRD. But as far ...
by skinny z
Mon Sep 26, 2022 11:18 am
Forum: Engine Tech
Topic: What was Chevrolet thinking ?
Replies: 27
Views: 1068

Re: What was Chevrolet thinking ?

The other old ZZZ cam 235/235° was in "straight up" 114/114. Do you happen to know the advertised values of that cam? I think we may have established that the performance difference might be minor but I'm still interested in how different they are. If the ramp rates are similar then the 235 is real...
by skinny z
Mon Sep 26, 2022 11:12 am
Forum: Engine Tech
Topic: What was Chevrolet thinking ?
Replies: 27
Views: 1068

Re: What was Chevrolet thinking ?

I wouldn't disagree with you as some experimenting with different profiles in various sim programs has proven what you suggest to be the case,. But I'll go out on a limb and say if one of those cams had the ideal valve events, not dialed in so as to get the best results but had valve events exactly ...
by skinny z
Mon Sep 26, 2022 10:48 am
Forum: Engine Tech
Topic: What was Chevrolet thinking ?
Replies: 27
Views: 1068

Re: What was Chevrolet thinking ?

The perspective is incomplete as I'll also have to know the advertised values for the 235/235 cam. That may prove difficult. My objective is to compare overlap values and then ask you if you think that could be a cause with effect. And this is not to dismiss the change a different IVC and ICL might ...
by skinny z
Mon Sep 26, 2022 10:19 am
Forum: Engine Tech
Topic: What was Chevrolet thinking ?
Replies: 27
Views: 1068

Re: What was Chevrolet thinking ?

Can you plot that with seat duration values please? Were they stated? Seat duration is where the answer lies? Not sure about the answer but I find that seat timing gives me a better perspective on the valve events. Summit Racing Part Number: NAL-10185071 UPC: 036666163278 Cam Style: Hydraulic rolle...
by skinny z
Mon Sep 26, 2022 9:34 am
Forum: Engine Tech
Topic: What was Chevrolet thinking ?
Replies: 27
Views: 1068

Re: What was Chevrolet thinking ?

The drop in lc is why the shorter cam works. 208-221 112LSA 112ICL IVO is -8.0 ° BTDC IVC is 36.0 ° ABDC EVO is 42.5 ° BBDC EVC is -1.5 ° ATDC 208-221 114lsa 114ICL IVO is -10.0 ° BTDC IVC is 38.0 ° ABDC EVO is 44.5 ° BBDC EVC is -3.5 ° ATDC Ok, so its the LSA then? So in this case what specificall...
by skinny z
Sun Sep 25, 2022 6:35 pm
Forum: Engine Tech
Topic: What was Chevrolet thinking ?
Replies: 27
Views: 1068

Re: What was Chevrolet thinking ?

Somewhere, someplace, I've had a conversation about those cams. One of them at least. Factory spec seat timing specifically.
If I find it, I'll post it here.
Seems to me F-Bird had a hand in it?
by skinny z
Sun Sep 25, 2022 5:21 pm
Forum: David Vizard forum
Topic: Cam Master
Replies: 13
Views: 2909

Re: Cam Master

Stan Weiss wrote: > [quote="skinny z" post_id=925890 time=1664122971 user_id=6881] > Stan Weiss wrote: > > [quote="skinny z" post_id=925388 time=1663536562 user_id=6881] > > Hi Stan. > > What's the latest with Cam Master? > > [/quote] > > > > Kevin, > > I got busy with other things and it has not be...
by skinny z
Sun Sep 25, 2022 3:24 pm
Forum: Engine Tech
Topic: How much advance for a less than optimal cam ?
Replies: 22
Views: 644

Re: How much advance for a less than optimal cam ?

Quick question as we're comparing a single pattern to a dual pattern cam. Perhaps not easily answered but what is the defining factor for establishing a duration split? I/E ratio? Exhaust system efficiency (as in open headers vs a full system)? Back in the 80's, we used Exhaust to intake ratio, but...
by skinny z
Sun Sep 25, 2022 2:54 pm
Forum: Engine Tech
Topic: How much advance for a less than optimal cam ?
Replies: 22
Views: 644

Re: How much advance for a less than optimal cam ?

Taking all the variables out of this conversation. Let's assume the optimum can for your application is 226/234@.050" on a 110 LSA, with a 106 ICL. Now, assume you have a cam from the same exact lobe family, so the acceleration rates, ramp design, and lift are the same, but it's a 230/230@.050" on ...
by skinny z
Sun Sep 25, 2022 1:39 pm
Forum: Engine Tech
Topic: How much advance for a less than optimal cam ?
Replies: 22
Views: 644

Re: How much advance for a less than optimal cam ?

The cams of same .,,050" spec and same events open close @ .050" on all the various high perf hyd flat tappet sbc cams will run MORE ALIKE THAN DIFFERENT. the real different in relative seat to seat real durations will be vey small +/-.. The practical design mechanical limitations are the same.. un...
by skinny z
Sun Sep 25, 2022 1:36 pm
Forum: Engine Tech
Topic: What was Chevrolet thinking ?
Replies: 27
Views: 1068

Re: What was Chevrolet thinking ?

May need a full lobe profile to answer this, the 208 might be an inverted lobe, or extremely aggressive ? 235 235 Equal intake exhaust, they don't know what you're using it in so they can't assume great flowing exhaust system, and it is a 90 degree V8 so the exhaust is always compromised. So I'm gu...
by skinny z
Sun Sep 25, 2022 12:58 pm
Forum: Engine Tech
Topic: How much advance for a less than optimal cam ?
Replies: 22
Views: 644

Re: How much advance for a less than optimal cam ?

Assuming that the events below .050” is the same is a big assumption. The engine sees seat-to-seat duration, not .050”. You can’t compare a Mike Jones designed lobes to Billy Godbold has designed lobes to Harold Brookshire designed lobes look at .050. Mike’s cams look smaller at .050” than they run...
by skinny z
Sun Sep 25, 2022 12:34 pm
Forum: Engine Tech
Topic: How much advance for a less than optimal cam ?
Replies: 22
Views: 644

Re: How much advance for a less than optimal cam ?

Assuming that the events below .050” is the same is a big assumption. The engine sees seat-to-seat duration, not .050”. You can’t compare a Mike Jones designed lobes to Billy Godbold has designed lobes to Harold Brookshire designed lobes look at .050. Mike’s cams look smaller at .050” than they run...
by skinny z
Sun Sep 25, 2022 12:22 pm
Forum: David Vizard forum
Topic: Cam Master
Replies: 13
Views: 2909

Re: Cam Master

Stan Weiss wrote: > [quote="skinny z" post_id=925388 time=1663536562 user_id=6881] > Hi Stan. > What's the latest with Cam Master? > [/quote] > > Kevin, > I got busy with other things and it has not been worked on since the end of > Oct 2021. > > If anyone is interested here is a 14 day trial versio...