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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.

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

@rafaellastracom6411

9 ай бұрын

Really, they get that high with the stock crank?

@bimmerfab

9 ай бұрын

@@rafaellastracom6411 all the time in Europe

Always a great production. 👍

@hpa101

10 ай бұрын

Much appreciated! Cheers for the support - Taz.

Awesome videos as always. Thank y’all!

@hpa101

10 ай бұрын

Our pleasure!

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.

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

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.

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

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

Great content !!!

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

9 ай бұрын

haha they are really entertaining dudes! - Taz.

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.

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

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

@ej20tnz

7 ай бұрын

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.

Aren't LS crankshafts cast from the factory?

@hyper8545

10 ай бұрын

I think is depends. Lota ls

@chippyjohn1

10 ай бұрын

LS engines are all crap, that is why.

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

@hpa101

10 ай бұрын

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

@seanb250

10 ай бұрын

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

@hpa101

10 ай бұрын

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

10 ай бұрын

@@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

10 ай бұрын

@@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.

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.