David Vizard's PowerTec 10 EP 22 Avoiding Timing Chain Power Losses

In this , episode 22, DV shows how to avoid undue power losses between the crankshaft and camshaft.These are moves rarely discussed so your SBC or Ford could be up by as much as 11 HP over your competitions.

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[amateurism]

F'in YouTube, I have many of your books, they are priceless even today, years after they were published. Now I discover your YouTube channel, really?

You are a hero to many of us. Thank you.

[hotrodray]

🔔You mentioned the vibration harmonics transmitted from the crank to the cam and dampers.
Years ago I saw a back to back dyno tests of SBC aftermarket dampers. Large diameter heavy factory one won.😱 What a surprise.

[luckyPiston]

So having a little more slack allows for a little more clearance for oil to ride between the chain rollers and the sprocket teeth hence reducing friction and drag, makes perfect sense. Kinda like that boundary layer affect that we also see with air flowing through a port, so what David is talking about here is fluid dynamics as much as chain tension.

[power]

Exacty! The slack and oil cushion helps to isolate the cam from the crank. Hence a belt does an even better job.

[micvik]

Love the frequent uploads, these videos are fantastic for us with above average interest in engine building 👍👍👍

[curvsme]

For anyone that rides motorcycles, that resistance is a noticeable quantity when pushing your motocross bike after putting a new chain and sprockets on. It's takes a good month before it really rolls freely. It's slightly better after a few runs but will glide almost effortlessly right before it's getting worn out.

[BubbaAyers]

Back in the 80’s running the 010 4bolt Chevy truck engines ran good with loose chains, you always heard someone saying: that thing runs better than it did when it was new

[troywee]

i remember way back also mate, you are as young as you feel! well thats what i tell myself! cheers.

[kenswitzer]

David growing old brings more knowledge and wisdom of which you are generous enough to share with us. Thank you very much.

[approachingtarget.]

Brands of products are also a big reason. I also have run into gears that had tapered wholes and sloppy key ways. They also sent me plastic cam walk buttons. You really have to watch what your buying. Inspection everything to fit as it should.

[brucejordan]

David vizard tech. explanationss unlike so many youitube videos . while watching , "I'm thinking to myself what language or combination of languages is the presenters peaking in", are so informational & mind powering . My only complaint is my mind is thirsting for part 2 that in most cases never appears. Because of part 2 which would be a accumulative summary of part 1 fallow up that is usually missing I don't know wether to give David A A+ for what I just watched or thumbs down because I'm left hanging waiting, [ & I have searched youtube for part 2 ] looking forward to part 2, the accumilation to every thing presented in part 1

[Gabe-dfjs]

David, it's amazing to see you outside of the pages of my favourite sbc building books! Love the tips and the knowledge you're sharing..

[keithfields]

Sir, your knowledge is well earned, and eagerly needed to be learned. It’s what I call Raw Wisdom. There’s a book that makes this very plain that we don’t learn from. With age comes much wisdom. We appreciate what you have to teach, and thank you.

[timruiter]

I had a Cloyes on my 351C which was very tight. And I thought this was the way a new chain should be. Than you for your experience DV!

[cjbert]

Timing chains have always been one of my pet peeves. It’s always hard to get one that fits correctly, I have a huge selection of new and used to find one that’s just right.

[kennethperian]

Thanks for showing telling, and all that good info about the chain well see ya next time see ya bye bye.

[albundy]

What is your evaluation of, Chevrolet factory original gear drive camshaft on a Chevrolet 427 Big Block industrial engine ( grain truck on a farm) ( reverse rotation camshaft, factory original).
Would a reverse rotation camshaft & gear drive "FIX" the chain problems?
Thank you for the Professional training & education.
Why are the camshaft companies NOT making reverse rotation camshafts and gear drive????
Can you test reverse camshaft & gear drive VS chain drive???
Using a Big Block Chevrolet (or small block) gear drive VS chain, using a electric motor to drive (power) a crankshaft ( without rods or pistons).
Also test, does high spring pressure require more horsepower????
Does roller lifter use more or less horsepower???
Does roller rocker arms use more or less horsepower???
Yes I know the crankshaft oil passages will spray oil, so a crankshaft without rod passages drilled out. Just ask a crankshaft manufacturing to Not drill out the rod passages.
Thanks

[panzerkfw]

Thanks again David. I've learned several things from this one video, not the least of which is the guy showing the chain tension. Always wondered what was right. And I bet I'm not the only one who said to himself "why have I been prying off the cam gear all these years" when that man drove the cam rearward with a drift and the cam gear just fell off. Maybe I overlooked that tip when I read one of your books.

[mykatawato]

Love the advice on avoiding HP losing too tight timing chains. Any chance you can do a video on Ford FE head porting, FE heads, FE rods and FE blocks? Their is such a resurgence in the original BBF with vintage Cobra, Mustang, Cougar, Galaxie and Fairlane restorations and hot rodding that the old FE engine family has gained a new life and quite a following of late. Keep the great videos coming as they are most appreciated and cherished! Great info there, keep educating the masses.

[montebradshaw]

My brother and I run something called a Cam Correct. Made by Roger Hurst marketed through Competition Products. I run a chain with 4 deg of stretch, on purpose! Lol. It's supposed to advance valve timing every time you let off the throttle. Its mostly aimed at the circle track community but we ve used it for mud racing.