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Search found 66 matches

by Rick!
Fri Dec 06, 2019 9:15 am
Forum: Engine Tech
Topic: Flat Plane V8 Race Engine - Single Exit Exhaust Question
Replies: 33
Views: 890

Re: Flat Plane V8 Race Engine - Single Exit Exhaust Question

What are the dimensions of the exhaust port? The torque hole with the 1.75 primaries is a huge ‘tell’ on what the engine wants. Like englert mentioned, a set of stepped headers should help considerably. Pipemax can help estimate diameters and positions. You may not be able to connect the brown down ...
by Rick!
Mon Dec 02, 2019 1:54 pm
Forum: Engine Tech
Topic: Rod strength
Replies: 35
Views: 1031

Re: Rod strength

lefty o wrote:
Mon Dec 02, 2019 11:22 am
rod being strong where they crack the cap, does not dictate rod strength as most would view it.
^^This guy gets it. It's a manufacturing operation, not a strength test. A few years ago, cracked cap rods were popular.
by Rick!
Mon Dec 02, 2019 1:50 pm
Forum: Engine Tech
Topic: Hemi vs Chevy wager...
Replies: 25
Views: 964

Re: Hemi vs Chevy wager...

For another $6K he coulda got a Helephant and 1000hp in crate. In 1978, I missed buying a hemi for my Belvedere by a few minutes. It went for $725. Mopar loyalists are a different breed and will go out of their way to not use "ordinary" hardware. My brother is one and he is the only S/Pro dragster o...
by Rick!
Mon Dec 02, 2019 11:51 am
Forum: Engine Tech
Topic: when are 3/4 grooved main bearings needed for bbc ?
Replies: 223
Views: 5026

Re: when are 3/4 grooved main bearings needed for bbc ?

If you take it one step farther, how much of the standard 180 degree groove is being used or could be eliminated. I believe one of the posters already commented that one can use less than 180* for the upper shell groove. The SAE paper measured the angle used up to accelerate the oil from the feed p...
by Rick!
Sun Dec 01, 2019 10:15 am
Forum: Engine Tech
Topic: when are 3/4 grooved main bearings needed for bbc ?
Replies: 223
Views: 5026

Re: when are 3/4 grooved main bearings needed for bbc ?

http://sbftech.com/index.php?PHPSESSID=436d94e3a245118ff86241904470d601&action=dlattach;topic=38378.0;attach=52803;image http://www.supermotors.net/getfile/798026/fullsize/clevoilsketchjpg.jpg Main priority cleveland: https://www.tmeyerinc.com/product/track-boss-cleveland-block/ Then there's this: ...
by Rick!
Thu Nov 28, 2019 8:10 am
Forum: Engine Tech
Topic: Flat Plane V8 Race Engine - Single Exit Exhaust Question
Replies: 33
Views: 890

Re: Flat Plane V8 Race Engine - Single Exit Exhaust Question

Hi All, I'm looking for a little advice on exhaust system diameters and merge points for my race car project. I'm fairly comfortable with header diameters and lengths, however, our regulations stipulate that we must have a single exit exhaust at the rear of the car. All of the examples of math that...
by Rick!
Tue Nov 26, 2019 7:48 am
Forum: Engine Tech
Topic: when are 3/4 grooved main bearings needed for bbc ?
Replies: 223
Views: 5026

Re: when are 3/4 grooved main bearings needed for bbc ?

A wide survey of the crank pile today it looks like (with rod UP) hole the main is in the range of 9 o-clock to 6 o-clock position, on everything. 454 or a 350 looks like about 8 to 9 o-clock. Which means the "holes would align", at 90-180 afterTDC In order to get them to align at 70, you would gri...
by Rick!
Fri Nov 22, 2019 9:03 pm
Forum: Engine Tech
Topic: when are 3/4 grooved main bearings needed for bbc ?
Replies: 223
Views: 5026

Re: when are 3/4 grooved main bearings needed for bbc ?

I have a billet crankshaft that was built for a reverse rotation engine. The oiling hole in the rod journal is in the what would be usual 1 o'clock-ish location for reverse rotation putting it at 11 o'clock-ish in standard location. I assume using as standard rotation is out of the question? Basica...
by Rick!
Thu Nov 21, 2019 7:36 pm
Forum: Engine Tech
Topic: when are 3/4 grooved main bearings needed for bbc ?
Replies: 223
Views: 5026

Re: when are 3/4 grooved main bearings needed for bbc ?

Some interesting crank oiling information: https://rehermorrison.com/tech-talk-51-crank-calls-part-ii/ https://f1-forecast.com/pdf/F1-Files/Honda/F1-SP2_08e.pdf Interesting how they measured negative pressure in the crank oil passage due to centrifugal forces. The hollow connecting rods are pretty t...
by Rick!
Tue Nov 19, 2019 7:41 am
Forum: Engine Tech
Topic: Mopar RB Crank Journal Spacing
Replies: 8
Views: 495

Re: Mopar RB Crank Journal Spacing

What is your goal? To make one? My goal is to have a reasonably accurate CAD model so I can do a bunch of modals on it to understand what rpm the crank shouldn't be run. By reasonably accurate, I mean it will have the right physics but not be perfect enough to to send to CAM and make a crank. (It c...
by Rick!
Sat Nov 16, 2019 4:49 pm
Forum: Engine Tech
Topic: Do electric turbo chargers work???
Replies: 22
Views: 1172

Re: Do electric turbo chargers work???

Maybe...
https://www.garrettmotion.com/

F1 was doing it in '14...
by Rick!
Sat Nov 16, 2019 4:39 pm
Forum: Engine Tech
Topic: Mopar RB Crank Journal Spacing
Replies: 8
Views: 495

Re: Mopar RB Crank Journal Spacing

Rick, I have several cranks at the shop. I will try to remember to measure a couple of them in the morning. Thanks for the measurements, Bill, much obliged. Diodedog, "two-piece" is another way of saying broken crank. The block, along with a new Bryant billet crank, is in Immokalee this weekend.
by Rick!
Sun Nov 10, 2019 5:09 pm
Forum: Engine Tech
Topic: Mopar RB Crank Journal Spacing
Replies: 8
Views: 495

Mopar RB Crank Journal Spacing

Does anyone know if distance between main journals 4 and 5 is the same as between journals 1 and 2?
I've got a two piece crank and a vernier and it's not quite the right equipment to make the measurements so I can complete the CAD model of it.
Thanks.
by Rick!
Mon Nov 04, 2019 6:27 pm
Forum: Engine Tech
Topic: Pros/Cons of using aluminum ring harmonic balancer?
Replies: 21
Views: 760

Re: Pros/Cons of using aluminum ring harmonic balancer?

any chance you can educate me on how ATI "tune" a damper? Typically with encoders on the crank measuring twist. By varying o ring design, number and durometer, along with diameter for a given application and rpm. That's the how. The "why" is that every crank has a torsional 1st mode (resonant frequ...