Crank modifications for increased power Part 1

Hearing people give credit for help is rare these days. You get a deserved like from me for having the humility to do that. Big win for humanity.

I spent 7 years machining billet cranks for a living, great job.

I am a 110% follower and when I sit down to rationally draw up my next engine build it will be done with your nuggets of knowledge you give us here on these videos. I can't tell you how much I personally appreciate the time and effort you put into teaching us a logical process in building a efficient and long-lasting engine. Thank You again David Vizard, the entire world of motorsports owes you big time!

Exactly why Youtube should exist, saving knowledge.

Wow! I've been wrenching, off and on for over 50 years and am amazed at what I'm learning. Well taught Mr. Vizard.

I have been reading your books since 1994 when I was in high school. You taught me all I know about engine tuning. Nice to see you on YouTube in 2023.

Mr Vizard's videos make me feel like I'm in college. He sounds like a teacher I would listen to. Thanks for sharing so much.

The more I watch this guy's videos the more I realize I'm just an engine assembler rather than the hot engine guy I thought I was. Thanks for sharing your tips and tricks with the gear head community.

This man is so humble his real name is Dave wizard. Thanks so much for the information and your awesome videos.

I've learned more watching your video than in the 40 years of building..... sometimes the basics is what I need to remember instead of trying to fit a 'square peg in a round hole' !!! Thank you for these. I'm sure as I go through your library I will soon have some questions.

David, you are hands down the best Engine fundamentals guy here on the youtubes. Even experienced folks enjoy your talks. Thank you!

David thanks for your good information.in the 80's I raced mini's built with the guidelines of your books ,I won many races with great success

One day I hope to see journal clearance as a topic. This session touched on surfaces and radii with a teaser regarding viscosity, and I think that’s worth elaborating on.

Thankyou David for all you have done over the years, I have studied and worked using your amazing books and manuals for many years. You explain things in detail and layman's terms that we can relate to so it makes sense and works for us. I often refer to them for clarity and realistic understanding. You're amazing!

I learned more from you about cranks in 25 minutes than I knew in my entire previous life span. I don't race, but I have built some sbc engines and other 4 cyl motors. This is some great information.

Thanks DV and Tom from SCAT 🏁 What a wealth of knowledge!!!

I'm new to your channel and I am not an engine builder but I'm getting ready to build my first engine 350 I'm definitely learning a lot from u I'd cherish being able to meeting you one day I think we're all very fortunate to have you doing your channel Happy Thanksgiving Mr Vizard

Crank polish is important for bearing life and oil temp. On a microscopic level, it orients the direction of the end grains of the metal, so the direction of rotation when polishing is important. When I polish a journal, I start with a P800 cork belt, and finish with a woven belt. Excellent results, with only about .0001 or so removed. Anyone that I have seen polish more than a few tenths to correct bearing clearances ended up with a journal that was out of round, tapered, or some combination of bad geometry. Micropolishing is effective in a production environment because the backing shoes must be made to a specific size. If you are micropolishing many of the same size journal, it is cost effective to make the required shoes. If you have many different sized journals the shoes would make micropolishing impractical. Micropolishing achieves the same affect as polishing with even less metal removal. Quite precise, and done quickly. Properly polished journals can support higher loads with lower oil clearance and oil pressure than a poorly prepared journal. As for friction, I would imagine you could get a bigger reduction in power loss from a more efficient oil pump than you can by reducing friction at the crank journals. Thank you for the excellent videos.

YOU ARE THE BEST DAVID....IV'E BEEN WATCHING YOUR STUFF SINCE AROUND 1990....LOVE ALL YOUR STUFF BROTHER!!!!

Man you're brilliant! I remember my father talking about such things when we were cleaning carberatures on his beloved classic cars... Of course he was not this much into racing! He was more of a restorer/collector I can't decide to quote which one of the lessons I learned of him, without being rude to the rest of them!