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David Vizard Performance
United States
Registrace 1. 12. 2007
Cam profile dynamics Vs event BS bashing!
In this, episode 70 part 2, DV goes for the throat on those consult guys and a few other pro's who are apparently spreading some pretty misleading info on cams. This is the second part of a focused BS attack on cam profiles and event timing that need to be straightened up. No holds barred here!
zhlédnutí: 26 945
Video
DV cam logic Vs totally pro originated BS
zhlédnutí 15KPřed rokem
In this, episode 70 - part 1, DV takes on what seem to be beliefs widely held by many professionals concerning 'cam profile dynamics Vs cam event timing'. When some grossly misleading info was put forward by a company that supposedly consults on the topic of cams and engines in particular DV decided it was time to do some serious BS bashing. So here, with little held back, is part 1 of the crus...
A V10 LS motor??
zhlédnutí 5KPřed rokem
In this, What's New #3 in PowerTec 10 DV covers some of the subjects that are upcoming. This includes super head porting DV flow bench program and though far from finally, a breakthrough in cam selection.
Why are these #'s critical for a good torque build?
zhlédnutí 43KPřed rokem
In this, episode 71, DV and crew chief Mervin Bonnet, reveal certain easily attainable combinations of parts can generate a stronger torques curve than others. This increased torque potential can amount to a sizable increase in lbs-ft per cube so it has the same effect as making your engine feel much bigger than it really is. Since all the moves described come about through increased efficiency...
Automatic readout cam timing wheel
zhlédnutí 15KPřed rokem
In this issue (68) of PowerTec 10 DV shows how to install and time in the cam for the 350 SBC intended for a Model 'A' Ford Hot Rod. In this video he covers a whole lot od cam install/timing the is rarely cover. the real never-before-seen deal is the DV double wheel degree wheel that removes the need to calculate the intake center-line. Instead it reads it out directly.
#3 of 'whats coming up' on this channel
zhlédnutí 4,5KPřed 2 lety
Here DV revels the some of the subjects of upcoming PowerTec 10 video's. He mentions that 'how to cheat -without cheating' and while in the middle of the race turn off the drivers engine in the car behind and more. You don't want to miss any of theses video's - for sure!
Our super hi-flow SB Chevy heads - flow bench results.
zhlédnutí 10KPřed 2 lety
In this, episode 62 part 4, DV really takes a hi-tech look at the flow figures our Ultra Pro 9 degree heads achieve on the flow bench. As he has stated so often flow #'s alone are at best short of even half the story. Additionally he goes on to show that you can acquire the tech know-how of a winning pro-stock head porter just by adopting the use of the IOP head porting program. Everyone from a...
Power sparks & how to use them.
zhlédnutí 19KPřed 2 lety
This is the continuing episode of 67 part 1. In this episode 2, DV reveals more basic but often misunderstood tech about ignition and combustion. You will find at least 3 commonly accepted Ignition and combustion beliefs that are shot down in ribbons.
Big Block air flow from small block heads
zhlédnutí 23KPřed 2 lety
Impossible though it may at first appear, here are the results of DV's efforts toward doing the finished porting on a set of UltrPro Machining 9 degree small block Chevy heads. Ultra Pro's CNC, 293 cc, 2.25 intake valve version goes to 440 cfm before 0.800 lift. Can DV match that. Guess you will have to watch this to find out!
Project updates you don't want to miss!
zhlédnutí 6KPřed 2 lety
In this episode of PowerTec 10, DV whisks through the status of the projects close to to being presented. He talks about how seminars might be conducted where more folk can be in on the show at a lot less money by means of Zoom. Also the new shop extension and the status of the cam timing with the double wheel on the 350 motor for cam and head testing that will ultimately be used for a Model 'A...
Spark tech for power and spark tech BS!
zhlédnutí 45KPřed 2 lety
In this, episode 67, part 1 of PowerTec 10, DV reveals spark tech that you probably did know along with some commonly held beliefs that are little short of BS. Whatever you may currently think you know now you will be better able to optimize the ignition system after watching this mini series.
Mystery power gains and losses
zhlédnutí 11KPřed 2 lety
In this, episode 66, DV looks into some mysterious power gains and losses which he never did fathom out. He is inviting you guys to throw in your 10 cents worth to see if new eyes can can spot a probable solution. Go for it guys!
Small shop porting for profit pt 1
zhlédnutí 8KPřed 2 lety
In this Dart University porting video presented by DV (episode 66) and aimed at small pro shops we ask the question 'can in house porting net more income than the purchase of an already fully prepped CNC head'. this video - the first of five parts - definitely provides the answer 'yes'. Here is how it's done.
What's new, for next two?
zhlédnutí 8KPřed 2 lety
This is #1 of a sub series of PowerTec 10 where DV gives out a few details of what the next two PowerTec 10 video's subject matter will be along with just some interesting side issues. To get the last of our about to be published video's just look for the last edition of 'What's new, for next two?"
Worlds highest flowing conventional parallel valve SB chevy heads??
zhlédnutí 25KPřed 2 lety
Worlds highest flowing conventional parallel valve SB chevy heads??
Totally Streetable 800 hp 87 Octane BB Chevy
zhlédnutí 24KPřed 2 lety
Totally Streetable 800 hp 87 Octane BB Chevy
GOOD NEWS -Blower motors are incorrectly dyno tested???!!!
zhlédnutí 14KPřed 2 lety
GOOD NEWS -Blower motors are incorrectly dyno tested???!!!
the Cocktail Motor - a build like you have never seen!
zhlédnutí 51KPřed 2 lety
the Cocktail Motor - a build like you have never seen!
The hi-nickle SB Chevy block controversy.
zhlédnutí 19KPřed 2 lety
The hi-nickle SB Chevy block controversy.
How we built that super competitive low buck 383 SBC
zhlédnutí 138KPřed 2 lety
How we built that super competitive low buck 383 SBC
What you say might not be what you meant
zhlédnutí 7KPřed 2 lety
What you say might not be what you meant
1000 hp capable Ford production line 5.0 block.
zhlédnutí 23KPřed 2 lety
1000 hp capable Ford production line 5.0 block.
Cam companies still have not got it right!
zhlédnutí 66KPřed 2 lety
Cam companies still have not got it right!
Project Farm car air filter test results contradicted
zhlédnutí 23KPřed 2 lety
Project Farm car air filter test results contradicted
Real low buck 60 lbs-ft and 60 hp minimum from stock iron headed 350 SBC
zhlédnutí 74KPřed 2 lety
Real low buck 60 lbs-ft and 60 hp minimum from stock iron headed 350 SBC
Turbo Exhaust port science Chrysler 2.2
zhlédnutí 8KPřed 2 lety
Turbo Exhaust port science Chrysler 2.2
What cast iron BBC heads are these? That combustion chamber does not look familiar to me.
I trust Project Farm
how do you calculate secondary pipe length? Did not hear on the video.
One nitrous deto will bend those into an s shape. Ask me how I know. lol. Love the vids!
Audio is missing or really low on some videos just music playing
Chrysler used a mushroom lifter. Years ago a friend had a drag racing engine that Maurice petty had built using mushroom lifter. He decided to swap to roller set up. After we got finished there was no difference in power and he was angry he wasted the money on swap.
Hello David. This is excellent information! Thank you for this. Do the other companies that make multi-electrode spark plugs perform as well as your reshaped specials or even the E3s? Is this something you have tested? I'm guessing this becomes much more important when stuck with a non-transistor system.
Thank you DV for the mini-series on lower end assembly. I am rebuilding a Saab 2.0L B205 and have been using your tips. Had an issue using the 40ft-lb recommendation with plasti-gage (red), it was showing about 0.004"-0.005" clearance, not enough compression. Repeating using full torque and was able to get around 0.0025" (the target). Some online forums mentioned similar issues and recommended full torque or the results were similar. I am guessing the 40lb rule is somewhat engine type specific. I will try out the 40ft-lb tip on my next SBC or SBF project. Now the question of why it didn't work as expected.. my guess would be the bearings are simply different width and thickness requiring more or less pressure. I am sure this technique would work with almost all engines, but some trial and error would be required to figure out what the acceptable level of torque is required. Interesting results, thought I would share. Just also thought thread pitch and diameter variance between the engines might influence this as well..
Id get in trouble, grade school for reading DVs books in school hidden in my class books. Teacher and my Dad thought I was a strange little man. ID go to the bookstore in the northridge mall or the local chevy dealer and buy everyone I could, even Smokeys, Gms performance catalogs etc.
Vizard! I've always said it wrongly- to rhyme with WIZARD........
Is this channel a scam????? It's different than the original.....Hmmmm
Thank You King David:)
Vizard again teaching the world the way it’s supposed to be. Can u imagine how much horse power and torque has been lost because of all those lazy tard cams they made for DECADES. Excellent stuff I’d LOVE to do a back to back test on a dyno to prove it to the naysayers :)
What happened to the bowl mods?
Please do vortech aluminum exhaust porting
Would this motor perform in a 7200 4wd 3/4 ton truck and still pull Camper,what camshaft do I need for my application??
The next time I take my mini van to the track, I'll stick in a K&N filter. In the meantime, I'll stick to top rated conventional air filters
I'd love to be a fly on the wall of your shop!
dave, why havent you made a "i dont have an opinion i have a dyno t shirt? that was hands down the best way to tell someone to get out of here w your BS ever lol. best quote ive ever heard by far. one thing ive learned over the years is know it alls dont know jack schmidt lol!
Excellent work David! It really works!
David any thoughts on PC products PC-7 for light port filling in an intake manifold? I did some research and found favorable comments on this epoxy. Price is good also! This would be used in your "light filling" application
Chip Barret-Smith applied Whitcomb Area Rule in Ohio canted valve chambers circa 1970
Great episode. Cam function is really critical and so difficult to grasp.
Flowmasters makes high pitch sound that changes the tone and makes the engine sound mean and desirable, to me the flow perfs comes after . On my lmp race car I use a walker because the goal is to be under 95db and no power loss
You are the Engine Father I never had. Can I have an allowance?
About 99% of the gear heads on the internet will debate that engines like a little backpressure! I ask them if they have had college level physics classes or a fluid dynamics class? On planet earth back pressure reduces flow which in an engine reduces power. I ask them why would you do H/C/I work to increase flow to only choke it back in the exhaust? They can never answer that question....they usually say well my uncle was a mechanic for 40+ years and that’s what he told me....😂😂😂. If back pressure is good then stick a potato in your exhaust pipe and see what happens. 😂😂😂
So does the header collector still have to be a tuned length, calculated? Prior to the termination box (resonator).
Interesting do you know how big the hole wss he drilled in the plug negative electrode? Just made me think what about if you had a hole in the electrode and the center electrode came up through the hole so you're given gap is the size of the hole to the size of the electrode, and if it was tapered from the inside you could have some adjustment on this gap and the spark would be right on the tip the flat part.
On a lower hp engine would a double roller chain be a consumption of power where a single roller could do the job just fine?
A Day and Night difference of understanding Exhaust backpressure and muffler design
Thanks for the heads up.
Excellent video with Dyno-proven results. My question is what is the measure of a chain that is too tight or too loose? How much range of deflection is preferred between the cam and crank gear and how many pounds of force are required as a standard to impose the deflection? 10, 25, or 50 lbs? What is the maximum “allowable wear” measured in deflection typically? Also, I realize this would be a variable on all different engine types as the cam and crank gears vary in spacing and chain length.
Just on the dyno: 355ci sbc 9:1 compression Trick flow 175 dhc heads Isky 258/262 208/208 @0.050 .464/.464 lift w/1.6 roller rockers 107 lsa with 4 degree advance 400 ft/lb @4200 360 hp @5100 16" vacuum @800 rpm 15° initial timing 34° total
Have an 010 block handy, going to basically follow this build, 500+hp is my goal. Be a fun daily driver, probably high 11 sec car or so.
Should I run a pcv valve on my 383 build?
all in favor of any and all seminars
I assume the pressed in studs are adequate for the job.
getting to grips with a rotary way out on the boondocks of NZ , I found it best to build my own straight though with lots of stainless polypads , the brass ones got flattened in days , any normal glass pack large mufflers fell apart . I made a few attempts at internal reflection cones too , were ok but stainless is to noisy . And with turbos have found a big expansion tube after the turbo is good . now it seems there are ways to design noise reflecting grooves at about the size of the sound waves , Gismag/new atlass had an article a few years ago ,would like to know more ,could greatly simplify the muffling , even make effective aero mufflers , next project I hope . Thanks David ,great info, and attitude , we say you attitude determines your altitude ,and fame without good character will destroy you .
best 🚀🚀🫡
You answered several questions
Old Crank - "in my day, we used flannel to filter our model T"
Do you have any experience with 4 liter Jeep 6 cylinder heads and also their 5 liter v8 head? Will look for an answer in this column. Thank you for all your info on small block Chevys.
🇦🇺🙂
You said in your book that balancing is a waste for street cars. Make up your mind.
Please dont use the lords name in vain !
Brilliant!
Aren’t Baja engines rebuilt ever so often, meaning multiple times a year which would mean that this story might not apply to every day engines that are looking for longevity? I’m not very well versed in Baja, so I’m asking and not being accusatory here. Maybe I’m missing something and need clarification, but I’m not entirely sure a baja engine can be compared to factory engines. I would think that companies with billions of dollars looking to extend fuel performance would maybe adopt K&N like filters because they not only produce higher horsepower, but increase fuel mileage and help with filtration that also filters better? I need something more than a story and more actual science analysis.
Dale here. I am glad that you have mentioned that the engine does not need back pressure. I have talked with many people about this, and they always say that there needs to be some type of back pressure. As I mentioned in another video that you did "Grumpy Jenkins" once made a comment about using slightly larger exhaust manifolds (in this case headers) so he could block backpressure and therefore gain a few more horsepower and a slightly quicker time on the track. With what you are talking about here validates his comments and makes me want to agree with you about the person who demands that the engine needs that backpressure is either ignorant or parroting words that someone told them were gospel. Thank you for the information that shows the fallacy of that view.
Thank you for sharing your knowledge. I hope some youngsters can learn from you. 😊
That's dam fine! where do I find the info on how I can try to do this on my heads? of better yet can I send my heads off and have them done? There's plenty of guys out that will port heads for me but I don't want to get ripped off by joe blows head job. I'm sure I could butcher them myself LOL!