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Search found 104 matches

by Rick!
Thu Jun 11, 2020 11:06 am
Forum: Engine Tech
Topic: Safe BSFC
Replies: 7
Views: 457

Re: Safe BSFC

A starting BSFC of 1.0 will make decent power on the dyno. Then go up and down from there in 5% swings to see what makes the engine happiest.
by Rick!
Thu Jun 04, 2020 1:53 pm
Forum: Engine Tech
Topic: energy suspension motor mounts
Replies: 13
Views: 561

Re: energy suspension motor mounts

Stop tuning the oil pump pickup to go into resonance at your operating RPM and try a different engine balance guy. Seems your regular guy's work may not be as balanced as it should be. Also, is the flex plate zero balanced? You mentioned the convertor - has that been balanced? If the ATI is SFI cert...
by Rick!
Tue Jun 02, 2020 7:27 am
Forum: Engine Tech
Topic: Oil pressue and centrifugal force
Replies: 10
Views: 540

Re: Oil pressue and centrifugal force

This one only costs you time to register and log in. https://www.hondarandd.jp/point.php?pid=661&lang=en Then read about "The Development of Reciprocating Parts". Between the two, you find the centrifugal force throws oil out of the crank and keeping the crank filled along with minimizing oil pressu...
by Rick!
Mon May 11, 2020 7:54 am
Forum: Engine Tech
Topic: Steve Morris Engines EFI Test
Replies: 5
Views: 679

Re: Steve Morris Engines EFI Test

Interesting.
No BSFC and no pph on fuel - a little disappointed at that.
It still leaves the big looming question - would a carb have made more power? :)
Would have really liked to see how the CNP tuning would have affected power after peak.
Thanks for posting the vids.
by Rick!
Mon May 04, 2020 8:02 am
Forum: Engine Tech
Topic: head stud clamping w/different thread pitch
Replies: 7
Views: 1153

Re: head stud clamping w/different thread pitch

Screw stress is calculated from its tensile stress area, which is between the major diameter and the minor diameter of the thread. Using the minor thread diameter would give a conservative clamp force or torque result. A screw's Proof Load is the highest tensile force the screw can handle and still ...
by Rick!
Thu Apr 30, 2020 8:15 am
Forum: Engine Tech
Topic: Progressive/Digressive rockers, flat tapppet..pros/cons?
Replies: 17
Views: 1001

Re: Progressive/Digressive rockers, flat tapppet..pros/cons?

I think the antonym to progressive is regressive - which fits what you are posing to the forum. Digressive, though what many posts could be considered, doesn't seem to be the word you are looking for to describe the reduction in rocker arm ratio as cam lift increases. Back on topic, cam lift profile...
by Rick!
Sun Apr 19, 2020 11:48 am
Forum: General Tech
Topic: 2019/2020 Ram Diesel
Replies: 2
Views: 311

Re: 2019/2020 Ram Diesel

Not me, I only had a 2013 with 800ftlbs of torque. It was the first year of Tier 4b emissions on the 6.7 which is fundamentally the same emissions package on them now. The exhaust brake was great. The power was great. Towing mileage was meh, unloaded highway mileage was significantly better than my ...
by Rick!
Wed Apr 15, 2020 10:03 pm
Forum: Chassis / Suspension / Body
Topic: How hot is the actual air expelled from center dividers on a brake rotor?
Replies: 11
Views: 632

Re: How hot is the actual air expelled from center dividers on a brake rotor?

Not sure this site is a good candidate for an answer for this question, but I'll take a stab at it. We are talking circuit type braking conditions, so feeding cool air with typical materials (Alum, CF, etc) is no problem. I'm toying with, in addition to the typical inlet (albeit slightly smaller if...
by Rick!
Mon Apr 13, 2020 11:01 am
Forum: Engine Tech
Topic: Spintron
Replies: 65
Views: 3599

Re: Spintron

Coincident with the introduction of GM's Gen 2 'F' body in 1970, oil system problems arose with a lot of Pontiac Trans Ams, with the highest proportion of complainants being in Quebec, Canada. The explanation turned out to be that the Pontiac chassis engineers had aced the tuning of their version o...
by Rick!
Thu Mar 26, 2020 11:19 am
Forum: Engine Tech
Topic: aeration from scavenge pumps?
Replies: 8
Views: 597

Re: aeration from scavenge pumps?

https://www.drysump.com/index.php/technical-info Seems like stated above, two scavenge stages are adequate for most applications. When we were designing a dry sump system for a turbocharged 750 twingle, the target scavenge volume was around 4 engine volumes at 7500RPM or so. More scavenge made it to...
by Rick!
Wed Mar 25, 2020 7:27 am
Forum: Engine Tech
Topic: SCAT 9000 Limits
Replies: 50
Views: 2836

Re: SCAT 9000 Limits

Out of everything on the Camaro, the crank is the only component worth worrying about for 5 minutes at WOT? Maybe looking crankshafts in Mercruisers might help your decision. I don't see a 500HP Mercruiser small block anywhere, though. SCAT doesn't list the alloy of the 9000 crank. If it is cast 434...
by Rick!
Wed Mar 18, 2020 1:41 pm
Forum: Engine Tech
Topic: Engine Masters rod ratio test results
Replies: 151
Views: 12024

Re: Engine Masters rod ratio test results

It is interesting to note that both Formula One and Cup engines run very long rods with ratios above 2.0. No, they don't Dale Carnegie would put it another way: "Here's a conversation about F1 rod/stroke ratio that might be interesting and shows myriad combinations of which some are below 2:1." htt...
by Rick!
Sun Mar 15, 2020 8:01 pm
Forum: Valve Train
Topic: Valve train control loss question
Replies: 26
Views: 2454

Re: Valve train control loss question

What's your recording rate on your O2's? It's not all smoothed out and at a low rate is it? With all that mayhem in the RPM trace, one would expect subsequent misfiring and lean mixtures. On my brother's dragster, I can evaluate little bumps and dips in the RPM trace, look at which bank the O2 leans...
by Rick!
Wed Mar 11, 2020 10:55 am
Forum: Electric & Hybrid Vehicle ** NEW **
Topic: An EV battery that could last 1 million miles
Replies: 13
Views: 1425

Re: An EV battery that could last 1 million miles

I like to read Sci-Fi so will wait until we create capacitor type energy storage methods. Not battery type storage methods. pdq67 https://www.techbriefs.com/component/content/article/tb/stories/insider/36298?utm_source=TB_Power_News&utm_medium=email&utm_campaign=20200311 Probably don't want to char...
by Rick!
Mon Mar 09, 2020 1:30 pm
Forum: Electric & Hybrid Vehicle ** NEW **
Topic: Wow , diesel cars and light diesel vehicles banned in Europe!
Replies: 28
Views: 3918

Re: Wow , diesel cars and light diesel vehicles banned in Europe!

A Quadtrac holds 450 gallons of diesel - that's over 18000 kWh. Close but no cigar. That might be the total energy in the fuel but a good diesel engine will only convert 40% of that (7,500 kW.h) to useful work - less if you include idling and part load. An electric motor that size will have at leas...