He's been a professional source since I started in the mid 70s. He knows what he's doing. He has great books to.

Thank you Sir for putting your life's knowledge into a format that will be your legacy to history. 👍😎

Learning the "whys" of engine performance makes my brain happy. Thank you Mr. Vizard!

Adhering to your principles, I built a Chevrolet 250 six cylinder that performed well beyond my expectations. That engine made so much torque throughout the entire rev range, it left me shaking my head in disbelief. It would absolutely destroy the 295 rear tires. It made a very difficult customer (putting it nicely) a very happy man. Thank you for sharing your priceless knowledge.

I know I'm late for the party but your information is so helpful and I am grateful for your lifelong dedication to helping us racers get the absolute best from our engines, thank you will never be enough.

Keep on posting these videos. Anyone who is interested will always learn a lot. Thanks for posting. Keep up the great work.

All good stuff here...even an old guy like me can learn a lot

David your in-depth study of all aspects of gas flow through engines is brilliant to say the least! Never have I seen such attention to detail explained to this degree, before. Watching your videos has given me a better understanding of harmonic imbalances, gas flow characteristics, and how to put into practice, these great lessons you give! Thank you for your time!

I'm only three minutes into the video and this popped into my head, so forgive me if it's covered later. That spring weight only tells half the story, literally. The bottom half of the spring doesn't move much (distance or velocity, bugger all energy/inertia), but makes a large portion of the weight. Were you to support one end of the spring with a string and just weigh the small end plus retainer, the weight difference would be even more dramatic, and that's the bit that moves the furthest

@rcamacho364

2 жыл бұрын

Yes. Even then the top half, moving the most, on the beehive looks to have even less than half the mass of the top of the outer dual spring. Less mass=faster acceleration with the same energy exerted to open the valve.

That was a good refresher talk. The really surprising thing though, it took motorsports 100 years to catch up with piston engine aircraft. When Suzuki came out with SACS engine in 1985 it was 'innovative' but oil jets directed at bottom of piston crowns was already 65~70 years old. Today it's pretty ubiquitous on many engines (even Harley Davidson for more than 10 years IIRC?)

Great video David, I've been to numerous seminars of yours at the PRI show. great stuff. I have two suggestions. First, the tip on the dial indicator on your valve spring tester is loose. that will ruin your life on accurately measuring your springs.Second, the easiest way to set up valve spring tester height,with a multiple spring combination is to just use the comp spring measuring tool,WITH the retainer on top of it, to set up your height.then there is no math involved ,or guessing. that will also allow the inner spring to be measured accurately Hope that helps ! Steve

Thanks for the update. very detailed. love the rule of thumb on the spring frequency requirement.

Thank you very much David. Love your videos, books and seminars and respect the tremendous knowledge you have and your approach.

You taught me more in 20 min!s than i ever new .! GREAT INFO !

Thank you very much Mr.Vizard I have studied your books for about 2 years, and even started on my first high rpm Ls3 build please post more.

Thanks David. Your videos make me feel like a kid on Christmas

Excellent presentation and dissemination information. Thank you David

Fantastic easy to understand information of obtaining performance thank you David for sharing your extensive knowledge!

Thank you for showing me, I am learning keep it up and well see ya next time see ya bye bye.

Quality viewing and very informative thanks for posting can’t wait to see when your coming back to Melbourne Australia 👌🏻🍻

aweshome work as always david vizard we love it.

Spring tech is very interesting.

Thanks again David for a very informative video. Changing the subject, just wondering what your thoughts are on ceramic coatings on engine internals?

Thank God for this wise man! I almost didn’t watch the video because of the sound quality(he doesn’t have a mic on him), but please just put on headphones and watch his video(s) if you care about your engines.

I have your SBC performance books from the early 70's, now videos🤠cool

David, my 63 Olds 215 has beehive springs, too!

Thank You that was great! I learned quite a bit today!

Love the coverage of this tech!!! I believe I saw the LS Chevy beehive springs on your 289 Ford vintage race engine - ? I am VERY interested in the camshaft you use in that engine, if it's not a secret... Anyway, I love your Power Tec 10 videos!

thank you for teaching us . I have a few of your books and enjoy them very much. im not a bulder I have a friend that does that but i love to learn so thank you again for the sharing of your knowledge.

Thank you! Very informative. Please do a video on bearing clearances! especially with regards to heat. Thanks!

fantastic education sir.one never stops learning..

Another great video thanks for sharing this is us I really learned a lot hear an I'm so impressed with the difference between the type of springs and the careikteristiks ove each one very important information thanks again for your help

Did you experiment with shot peening the competition springs to impart compressive forces? Maybe they are all manufactured that way. I know a lot of research went into finding the correct sized steel shot media for commercial springs. Great vid.

Great video! Can you do one on spring tip prep? Such as that offered by PSI and carried out to a further degree in organizions such as TRD. Also perhaps address cryo benefits.

Always excellent information and knowledge, very good presentation. However, the audio is inconsistent and sometimes difficult to hear clearly. Usually when David is farther from the mic. Very much enjoy all the videos... thank you.

brilliant mr Vizard thank you.

My dad knows david..I love your vids David. I hope you're ok

Great video thanks David, are the beehive springs suitable/available for smaller multi valve engines Nissan etc?

great knowledge only get from hard work testing and understanding the data thanks

Priceless

Very helpful

nice video be blessed man thanks for shirring intellect

I learned important things today before even putting my pants on.

You can see the valve literally bounce off its seat (several times) with the slo-mo of the large spring! OMG!

THANKS FOR GETTING BACK TO ME SO QUICK, I WILL GIVE THEM A CALL, DID YOU GET MY LETTER I SENT YOU?THANKS FOR YOUR TIME,MIKE

Question Sir. I am told that going from a helical cut camshaft gear to a straight cut timing gear set produces Harmonics that will drastically shorten the life or the valve trane. Is this true and will the beehive spring help? I'm more interested in Horsepower combined with longevity. Thank you for your time and sharing your knowledge.

Wow....David is cutting edge....

David I was wondering would it be plausible to spec a half a set of valve springs for the intake and 1/2 a set for the exhaust with different spring rates to fine-tune the difference in lift of the two like for instance if you have a 520 lift on the intake and a 560 lift on the exhaust would it be worth it for the extra .040 lift kind of like when Chevrolet uses a 1.6 ratio rocker on an intake in a 1.7 on the exhaust

Great stuff. Especially the clear rocker cover, hence the motion and " follow through"; of the spring. Was that 25 thou Mr. Vizard?Forgive the question but just double checking! Have a good one all, Adam.

Do you have a video on the conical valve spring like the other 2?

Ok, going to tell on myself. I tried to wipe the smudge off of the wall behind Mr. Vizard. Well, my phone needed cleaning.

Interestingly (or not) Peugeot used a tapered spring on the EW10 (2ltr petrol) This was some time in the mid/late 90's

That's the first time I've seen a taper / conical spring tested. interesting. Looks like it maxed out the spring tester? How much accelerated wear are you going to get though on a street motor? Would it be better to use them with a full roller valve gear? (followers and rockers)

@hotrodray6802

4 жыл бұрын

IMO engines built to this degree are full roller everything.

Hi J Guti...would you be willing to share more info on that Chevy 250...thank you in advance. I have Chevy 305 that needs help.

High speed resonances in high speed filming shows funny results at 15000 rpm. Tuned lengths to match top rpm. On bikes.

how do the spring stress compare. if fewer coils work then fewer coils twist more??

How do we find the frquency of the spring ?

HI DAVID ANOTHER GREAT VIDEO THANK YOU, WOULD THESE SPRINGS BENEFIT A STROKER ENGINE THAT WILL ONLY TURN 6800 RPM? OR WOULD I BE BETTER WITH THE SPRINGS YOU RECOMEND IN YOUR HOW TO BUILD HORSE POWER ON A BUDGET BOOK FROM LUNATI, THANKS AGAIN

@sc358.

5 жыл бұрын

Yes they can benefit. Call up PSI (preferably) or PAC and they will hook you up for your application. I run beehive in my hobby stock and only turn 6,000. You will find on a spintron that losses of control of the valve motion occurs in different rpm ranges not only high rpm. Therefore having a valvetrain that works together as a system is important for durability as well as power even if not revving to ultra high rpm.

Where can the oil extreme be purchased?

Commonly its recommended that springs has 0.06” left until coil bind. Am I understanding it right that behive and conical springs can(should) be used with only 0.025” margin?

@brockparsley8843

2 жыл бұрын

I have the same question about beehives

With a beehive, what’s the max over the nose seat on a mechanical flat tappet for a racing engine? 370lbs?

So what he's saying is my springs are shit

🔔👍

Is that spring still availible?

@CharlesLease-ei1ee

8 ай бұрын

Look it up

That was "new valve spring tech " about 8-10 year's ago.....lol

seat force! yes. it's not pressure.

Hello and I congratulate you Mr. David I write to you from Caracas, Venezuela my Name is Ruben Alfonzo megustan the high performance engines I need to consult the subject is referring to the chevrolet engine Ls-3 Iron block and the performance of this engine please can you support me with the query about what is better to do 700 Hp- "O" more for the street with mechanical roller cam (stoker "or" change the crankshaft and piston) for one of better quality and brand Osea stroker. OR. crankshaft change

I was blind but now I see. Honestly this information is isolating until you start winning races with your builds. I'll just be telling the machinist specs and that's it. If you constantly engage in conversation about components it's a nuisance. Better to nod and smile.