Getting This Wrong Is VERY Expensive | Crankshafts

In this webinar we’ll look at the common options available for crankshaft construction, both from an OE perspective as well as in the aftermarket. We’ll discuss cast vs. forged vs. billet construction and learn about the pros and cons of each.
This is a HPA members-only lesson that has already been available on our website for 12 months or so, along with over 300 other lessons on a HUGE range of performance topics.
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TIME STAMPS:
0:00 - Intro
0:55 - Cost vs performance and reliability
1:40 - 4G63 drag engine example
4:15 - What options are out there?
5:10 - Cast
8:30 - Forged
13:15 - Billet
17:55 - Oil supply
20:10 - Material considerations
23:00 - Surface hardening
27:30 - Checking for crank walk
30:45 - Bearing selection
36:15 - Questions
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TAGS:
#highperformanceacademy #buildtunedrive #motorsport #enginebuilding101 #dontletthesmokeout #carmods #automotive #motorsports #racing #dragracing #endurance #circuitracing #roadracing #boost #crank #crankshaft

[@bimmerfab]

Bmw m50b25 do really well at 800-1000hp with a cast crankshaft

[@rafaellastracom6411]

Really, they get that high with the stock crank?

[@bimmerfab]

@@rafaellastracom6411 all the time in Europe

[@rafaellastracom6411]

One thing I would add is that using a billet crank for really demanding applications should be machined from vacuum melted and preferably re-melted material. The re-melting process (VAR or ESR) ensure fracture toughness in the tangential direction almost as high (@ 90%) as in the longitudinal direction. As such it would actually be better than even forged cranks made of standard wrought material. Great video BTW, love the content.

[@smudger6461]

Always a great production. 👍

[@hpa101]

Much appreciated! Cheers for the support - Taz.

[@zac2384]

I really want to build a JZ powered car with the BC lightweight 3.0 crankshaft. I believe it's something like 13 lbs lighter than stock, which I saw helps the mid range torque immensely.

[@25aspooner]

Awesome videos as always. Thank y’all!

[@hpa101]

Our pleasure!

[@blueyhis.zarsoff1147]

Read some notes the other day, Repco used stock cast cranks in Repco F5 Holden engines way back, they just knew how long they would last.

[@JDM_Jeffro]

Always super informative content guys! Could listen to this kinda stuff for hours (HPA Podcast) :)

[@jamesgarrard4361]

we ran cvh ford turbo on stock cranks to 9k and 380 ps no worries ztec 2.0 turbo 550ps 8000rpm no problem ?

[@jlmarco7552]

perfect webinaire again :) its possible for a next vidéo to talk arround the flywheel please ? benefits and disavantage ? :) thx so much for your brillant work and sharing

[@bernardofontes6558]

Great content !!!

[@newagetemplar6100]

Top Russian scientists have recently experimented with carbon fibre con rods and ball bearing cranks . The results of their experiments along with many others can be found on YT - garage 54 . 😂

[@hpa101]

haha they are really entertaining dudes! - Taz.

[@iansmith6728]

Volvo changed to a mid crank thrust bearing mid 80's, saw the issues with crank walk on their turbo engines, said bugger that (in their best Swedish) and went back to a full circle main thrust bearing on #5.

[@Ak3rn0]

If the chemical hardening process bends the crankshaft out of spec, how is it used in the original manufacturing?

[@dcptiv]

thing I never understood about cast grain structure compared to forged or billet is that forged & billet were both molten at some point.

[@ej20tnz]

Whilst the forging was molten, it's not molten during processing, hence a grain is produced, casting doesn't have a grain because it's phase changed when it's molten. Billet items also only have a grain in the direction it was formed into a billet in the first instance.

[@seanb250]

many stock cast crank Barra's out there making 1000hp

[@hpa101]

Peak HP is only one data point that on its own doesn't mean a whole lot - Taz.

[@seanb250]

@@hpa101 plenty of cast crank barras running 9’s or better then, is that a more appropriate answer?

[@hpa101]

Depends who is asking the question and what they want to know in the first place I guess 😂 What do you have planned next to get down into the 8's with your Barra? - Taz.

[@seanb250]

@@hpa101 not my barra but my cylinder head and intake manifold on one is already in the 8’s Taz, 8.42 @ 172mph. You can check it out from Drag Challenge earlier this year, look for the Green Barra powered Torry 👍 would you like a link? The major thing in my opinion your overlooking here is the load per cylinder, your 1100hp 4 cylinder has 5 main caps, the 1100hp Barra has 6 cylinders and 7 main caps, less load applied by each cylinder and also supported by more main caps.

[@seanb250]

@@hpa101 also if the Torry was able to put the power down at 172mph would translate to a high 7 second pass, the suspension is being rebuilt hopefully for next year.

[@maxwelltannenbaum]

Aren't LS crankshafts cast from the factory?

[@hyper8545]

I think is depends. Lota ls

[@chippyjohn1]

LS engines are all crap, that is why.

[@nagyandras8857]

meh.. up to 2x the stock power you are just fine with a cast crank. remember, back in the old days they had no wierdboyz and brainboyz. just mekboyz. things where well over engineered, none was able to figure out how to produce them just barely sufficiently strong. unlike nowdays. and that is why you can grab a junkyard cast iron engine, get rid of the rust, rebuild, and make an easy 500 hp virtually out of any older v8 engines with litte efforth. allso we must mention the good old om606 that is clean deal with stock internals to 600 hp. the NA version did some 80 or so hp in stock form, btw. cast material is naturaly not strong. but you should not say those are to be forgotten.