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Search found 199 matches

by pastry_chef
Mon Jan 11, 2021 9:43 pm
Forum: Engine Tech
Topic: Flat Tappet vs Roller Specs
Replies: 36
Views: 1235

Re: Flat Tappet vs Roller Specs

Please post a few more details.

Bore, stroke, rod length.
valve sizes and head flow.
Compression ratio.
by pastry_chef
Sat Jan 09, 2021 6:56 pm
Forum: Engine Tech
Topic: Cam King
Replies: 16
Views: 2218

Re: Cam King

Mike,
I recall talk of a cam program in progress that would eventually be available for purchase. Is that still in the works?
Thank you.
by pastry_chef
Sat Dec 12, 2020 11:53 pm
Forum: Engine Tech
Topic: Acceleration curves
Replies: 32
Views: 1598

Re: Acceleration curves

Just a few great tools:

https://www.motionsoftware.com/dragsim5.htm

Larry (maxracesoftware.com) is also working on an updated version of his "ET Analyst"
by pastry_chef
Fri Dec 11, 2020 12:14 pm
Forum: Engine Tech
Topic: cam area vs power
Replies: 18
Views: 1243

Re: cam area vs power

Why the big concern over the opening area, The first thing to do is to get the events on the right LCA and both the cams you are using are not optimal for the apparent spec of engine you are running. DV Thanks David, Personally I'd use more duration than the larger cam and tighter LSA. I'm curious ...
by pastry_chef
Wed Dec 09, 2020 2:10 pm
Forum: Engine Tech
Topic: cam area vs power
Replies: 18
Views: 1243

Re: cam area vs power

Thanks for the comments. This was not my engine, cam selection or dyno. Attached dyno image of two results. Important note: reportedly the smaller cam version detonated itself to death on the dyno. I strongly believe that engine was sick or maybe the cam was retarded. 276 VS OF.jpg Believe it or not...
by pastry_chef
Tue Dec 08, 2020 8:29 pm
Forum: Engine Tech
Topic: cam area vs power
Replies: 18
Views: 1243

Re: cam area vs power

Picture
compare.png
by pastry_chef
Tue Dec 08, 2020 6:16 pm
Forum: Engine Tech
Topic: cam area vs power
Replies: 18
Views: 1243

cam area vs power

Pontiac 455 Lets say bore 4.185 , stroke 4.21. 9.2 compression ratio. Cast iron dport heads 2.11 intake , 1.77 exhaust valves - intake 250 CFM @ .500 exhaust say 215 CFM. Matched dual plane intake. 1.65 rockers. Quad jet carb. Estimate how much power difference? Smaller hyd roller on 110 LSA Intake ...
by pastry_chef
Sat Dec 05, 2020 5:26 pm
Forum: Engine Tech
Topic: Big Issues with Cylinder Pressure (DCR)
Replies: 142
Views: 4583

Re: Big Issues with Cylinder Pressure (DCR)

You are confusing the definitions of torque and work, which are not the same thing. He always has and will never get it! Shameful. Work and engine POWER here. https://www.grc.nasa.gov/WWW/K-12/airplane/ottoa.html Not one mention of "torque" on the page. If your theory contradicts motorsport champio...
by pastry_chef
Thu Oct 22, 2020 8:29 pm
Forum: Engine Tech
Topic: duration @ .050"/ .200"
Replies: 29
Views: 2393

Re: duration @ .050"/ .200"

A bit like asking how high is high, it depends. I'm known for being a deep searcher. :) Some great comments here: https://www.speed-talk.com/forum/viewtopic.php?t=12012 Mike Jones stated - "Since the .200" number changes with the design, and is not only a product of the required duration, but the re...
by pastry_chef
Wed Oct 21, 2020 9:06 pm
Forum: Engine Tech
Topic: duration @ .050"/ .200"
Replies: 29
Views: 2393

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
Please post all the specs you have for both cams and details about your intended engine / application.
by pastry_chef
Thu Oct 15, 2020 8:42 pm
Forum: Engine Tech
Topic: test, do not reply
Replies: 4
Views: 3061

Re: test, do not reply

Chris used to post on many forums pretty much daily. I think he has less time in recent years.
by pastry_chef
Wed Oct 07, 2020 1:51 pm
Forum: Engine Tech
Topic: Port volume dyno testing
Replies: 11
Views: 1174

Port volume dyno testing

by pastry_chef
Tue Oct 06, 2020 7:58 pm
Forum: Engine Tech
Topic: New Peanut Port Head Test
Replies: 19
Views: 1926

Re: New Peanut Port Head Test

vortecpro wrote: Mon Oct 05, 2020 7:54 pm Maybe this will give you some data to work off of.
Hi Mark, what lifters were you running?
by pastry_chef
Sun Sep 20, 2020 11:16 pm
Forum: Engine Tech
Topic: Crane Hi-6
Replies: 11
Views: 554

Re: Crane Hi-6

We really liked those Hi-6 units, ran them for many years.
I've seen one unit die, the owner did power wash his engine bay right before then so maybe he got some water into it.

I agree about the Daytona Sensors thought. I'd buy from them.
by pastry_chef
Sun Sep 20, 2020 9:53 pm
Forum: Engine Tech
Topic: Pontiac 6X heads and cam suggestions
Replies: 10
Views: 542

Re: Pontiac 6X heads and cam suggestions

Butler has many aftermarket style valley pans with better clearance.
https://butlerperformance.com/c-1234757 ... -pans.html

They also carry these very nice lifters.
Johnson High Performance Hydraulic Roller Lifter Set, Short Travel JLI-ST2112OPR-16