Your books taught me more about engine performance than any other single resource. I've been enjoying your articles for years and it's good to see you still spreading the good word.
Mr. Vizard, I have been reading your books since 1996. I recently built a 302 ford with stock heads which I ported using your flow bench plans with a hydrometer. I used zero deck clearance and took forty thousands of the heads. My friends and neighbors can't believe that the engine is a stock 302 with machine work and porting. Runs awesome and I attribute it to your teachings. Thank you. I am a life long fan.
I just found out he had a channel a week ago too, I have many of his books. I don't think Google understands that people of all ages use UA-cam yet, Google certainly doesn't understand that people use UA-cam as a learning tool-If Mr. Vizard is not showing some half-naked girl or yelling political nonsense, no one will ever know of his channel. This channel should make one video of a Tesla electric motor knocking a naturally aspirated engine off a shelf, then have the engine falling on an ar-15, crushing it, then everyone will know about this channel. Watch, this comment prevents me from getting a job one day.
Love your power tech videos, Thanks for your research on the BBC, especially about port velocity, Cr, LCA. Your knowledge is priceless.and your books are full of it. Thank you very much.
Good to see you again David, hope you are keeping well. When I was a young fella driving my early Holden cars it was not uncommon for us to fit our hydraulic lifters with a solid kit which is what I suspect you were referring to early in this video. It was a common performance modification to give a quicker pedal response from the old Holden engines. Stopped any leak down and gave a nice little engine clatter sound to annoy the old folk. As an interim (and easy) modification to help a little we would also simply use a heavier oil which gave a little more time before you had any meaningful leak down. Great ti see you again, keep up the good work.
I'm still reading them too. I observed years ago: whatever you do in life, at some point you wind up teaching. A tip of the hat to all those that pass their hard fought knowledge along to others wherever they are.
David, I refer to your books often. One thing "please check the lens of your camera before you start and make sure it is clean" and KEEP UP THE GOOD WORK. I learned something already and it couldn't have been better timing. I've got a slightly built BBC (491) with aluminum heads in my 70 Chevelle and have used your books throughout the entire process. I'm thinking about swapping out my current cam for a Nitrous profile and adding some boost that way. Thanks for bringing things online and giving us firsthand knowledge straight from the source!
I’ve shared your channel on my FB build page Bubba’s model building, I’ve tested a lot of cams myself since 85 but not that many 😃, we went threw a ton of Crane but Comp came out on top at the end, thx for sharing love your content
Thanks for sharing your knowledge David. Love the videos. Is it possible for you to do some videos on overhead cam 4 valve per cylinder heads? Thanks again
@ 16.10 David Vizard slams hydraulic roller lifters. Love it. Anti-pump up lifters, do those old ads for Rhoads lifters come to mind? Always thought that paying extra money for a preworn lifter with big clearance is not money well spent.
Regarding the change from solid to hydraulic lifters by manufacturers back around the early 1960's. I think possibly another advantage for the manufacturers and their service centres was the hydraulic lifter did away with the need to adjust tappets which was always a contentious issue with workshops. I imagine it would have been one of the least favorite jobs for young trainee mechanics.
We put sold roller lifters on hyd roller cams all the time with excellent results. Zero lash on aluminum heads, .003” on iron. .904” on most everything. I think you have to touch on cam to crank C/L, lifter bore index and body clearance when discussing cam & lifter performance and function. We spend a great deal of time correcting those parameters.
Neatly covered. Can you add the link in the video description? Format was cropped [left and right sides reduced] and... it just doesn't present completely. Having never done any spintron testing myself, my only observation in the past was: better follow the cam mfr spring specs. Hydraulic lifters have their own comfort area regarding spring rates snd that's that. Nice to learn a bit about polymers too - I always knew viscosity mattered when it comes to operating anything hydraulic [I have observed high pressure pumps just go haywire on output pressure/make a racket due to low vis caused by high temp/insufficient sump levels, but that's not automotive].
Very thought provoking indeed, thank you for making the video. The viscosity issue/parasitic loss makes me wonder, if there would be merit in inserting an extra oil cooler just in the galleries feeding the valve gear or specifically the lifters.
David, Any plans for another seminar or two in 2021 (obviously pandemic-contingent)? I sincerely would like to get to one. The website rarely seems to have much updated info.
If you need to shim a collapsing lifter, you have a worn out or wrong lifter. If you taking it apart to get to them knowing that, why would you not just replace them?
@@garlandjones7709 I am referring to something that DV said on a forum. I do not have a collapsing lifter. He knows what I am referring to, but I know he is a busy guy and can't answer everything. I've asked twice and sooner or later he will probably see my question and reply.
Quick question, I was always told that the reason behind the introduction of hydraulic lifters was to eliminate any further valve adjustments? Is there any truth to that David? or had my auto shop teachers just talking BS. Thanks
Please keep the videos coming. I've looked up before notice the crane no longer makes your part number camshafts from your small block Chevy book do you have those camcards somewhere we can download?
Probably closer to triple that or even more, can't imagine them only making 1 pull per cam? Running jets or fuel injection changes, timing changes, header changes. Wouldn't suprise me if were closer to 80,000 pulls and thats pretty damn crazy! Even at 4 pulls per cam, that 32,000 dynamic pulls.
With respect to David, this episode reminded me of when Engine Masters swapped hydraulic rollers for solid rollers. Would love to hear David's analogy. Too bad I can't find the complete episode since it was on Motor Trend TV. I guess we'd have to join: ua-cam.com/video/GZTdo2-cGCM/v-deo.html
I have seen way too many stories of Comp cams being shredded after days of driving. They owner fills the engine with high zinc break in oil, runs the engine at 2000-2500 RPM for 20 minutes, and the cam and lifters are still torn to shreds. I have heard some other brands are also trash.
![Lp. Сердце Вселенной #60 РОЖДЕНИЕ ЛОЛОЛОШКИ [Финал] • Майнкрафт](http://i.ytimg.com/vi/YoR0pAV9FVQ/mqdefault.jpg)
Your books taught me more about engine performance than any other single resource. I've been enjoying your articles for years and it's good to see you still spreading the good word.
Mr. Vizard, I have been reading your books since 1996. I recently built a 302 ford with stock heads which I ported using your flow bench plans with a hydrometer. I used zero deck clearance
and took forty thousands of the heads. My friends and neighbors can't believe that the engine is a stock 302 with machine work and porting. Runs awesome and I attribute it to your teachings. Thank you. I am a life long fan.
Can't believe you don't have more subs. i've been reading your books since I was a kid.
I bet no one knows that David has a u tube channel....I did not !
I just found out he had a channel a week ago too, I have many of his books. I don't think Google understands that people of all ages use UA-cam yet, Google certainly doesn't understand that people use UA-cam as a learning tool-If Mr. Vizard is not showing some half-naked girl or yelling political nonsense, no one will ever know of his channel.
This channel should make one video of a Tesla electric motor knocking a naturally aspirated engine off a shelf, then have the engine falling on an ar-15, crushing it, then everyone will know about this channel.
Watch, this comment prevents me from getting a job one day.
Love your power tech videos, Thanks for your research on the BBC, especially about port velocity, Cr, LCA. Your knowledge is priceless.and your books are full of it.
Thank you very much.
Thank you for all the years of information..........
Good to see you again David, hope you are keeping well. When I was a young fella driving my early Holden cars it was not uncommon for us to fit our hydraulic lifters with a solid kit which is what I suspect you were referring to early in this video. It was a common performance modification to give a quicker pedal response from the old Holden engines. Stopped any leak down and gave a nice little engine clatter sound to annoy the old folk. As an interim (and easy) modification to help a little we would also simply use a heavier oil which gave a little more time before you had any meaningful leak down. Great ti see you again, keep up the good work.
Nice lesson on the history of lifter technology
I still read through your books........ Ty
I'm still reading them too.
I observed years ago: whatever you do in life, at some point you wind up teaching. A tip of the hat to all those that pass their hard fought knowledge along to others wherever they are.
David, I refer to your books often. One thing "please check the lens of your camera before you start and make sure it is clean" and KEEP UP THE GOOD WORK. I learned something already and it couldn't have been better timing. I've got a slightly built BBC (491) with aluminum heads in my 70 Chevelle and have used your books throughout the entire process. I'm thinking about swapping out my current cam for a Nitrous profile and adding some boost that way. Thanks for bringing things online and giving us firsthand knowledge straight from the source!
Thanks David. You always share so much knowledge
Hi David, I hope you're keeping well, good stuff as always buddy.
You got a great sense of humor David although some people may not get it
Looking forward to part 2. Thank you.
I’ve shared your channel on my FB build page Bubba’s model building, I’ve tested a lot of cams myself since 85 but not that many 😃, we went threw a ton of Crane but Comp came out on top at the end, thx for sharing love your content
Thanks for sharing your knowledge David. Love the videos. Is it possible for you to do some videos on overhead cam 4 valve per cylinder heads? Thanks again
Sir would you please review"Rhodes"lifters? Thank you.
@ 16.10 David Vizard slams hydraulic roller lifters. Love it. Anti-pump up lifters, do those old ads for Rhoads lifters come to mind? Always thought that paying extra money for a preworn lifter with big clearance is not money well spent.
Any plans for new books?
Good info David, thanks.
So much great info. I've put together my share of engines but I always strive to learn, Indeed I am! Thank you David!
Regarding the change from solid to hydraulic lifters by manufacturers back around the early 1960's. I think possibly another advantage for the manufacturers and their service centres was the hydraulic lifter did away with the need to adjust tappets which was always a contentious issue with workshops. I imagine it would have been one of the least favorite jobs for young trainee mechanics.
Not to mention easier to slam together on the assembly line.
We put sold roller lifters on hyd roller cams all the time with excellent results. Zero lash on aluminum heads, .003” on iron. .904” on most everything.
I think you have to touch on cam to crank C/L, lifter bore index and body clearance when discussing cam & lifter performance and function.
We spend a great deal of time correcting those parameters.
What's the benefit of doing this versus just swapping in a solid roller cam along with the solid lifters?
Neatly covered. Can you add the link in the video description? Format was cropped [left and right sides reduced] and... it just doesn't present completely. Having never done any spintron testing myself, my only observation in the past was: better follow the cam mfr spring specs. Hydraulic lifters have their own comfort area regarding spring rates snd that's that. Nice to learn a bit about polymers too - I always knew viscosity mattered when it comes to operating anything hydraulic [I have observed high pressure pumps just go haywire on output pressure/make a racket due to low vis caused by high temp/insufficient sump levels, but that's not automotive].
I called Comp and was on hold for over 4 hrs. "Customer service "
Very thought provoking indeed, thank you for making the video. The viscosity issue/parasitic loss makes me wonder, if there would be merit in inserting an extra oil cooler just in the galleries feeding the valve gear or specifically the lifters.
Thank you
Ty David, 🙏
David, Any plans for another seminar or two in 2021 (obviously pandemic-contingent)? I sincerely would like to get to one. The website rarely seems to have much updated info.
Merry Christmas David and to your family do you have any plans to come back down to Melbourne Australia
Let’s talk about the serious problem of getting any flat tappet hydraulic lifters that ain’t complete garbage.
Thank you sir!
Rhodes lifters?
I've read about shimming a hydraulic lifter to keep it from collapsing. Can you elaborate? Thank you
If you need to shim a collapsing lifter, you have a worn out or wrong lifter. If you taking it apart to get to them knowing that, why would you not just replace them?
@@garlandjones7709 I am referring to something that DV said on a forum. I do not have a collapsing lifter. He knows what I am referring to, but I know he is a busy guy and can't answer everything. I've asked twice and sooner or later he will probably see my question and reply.
Where might i find the oil extreme for sale?
Is there any benefit from burying your Engine block under ground for a year for better machining and strength?
very informative. crane cams still in business? what are your to picks for cam manufacturers for sbc chevy.
Quick question, I was always told that the reason behind the introduction of hydraulic lifters was to eliminate any further valve adjustments? Is there any truth to that David? or had my auto shop teachers just talking BS. Thanks
That's true. He states this in the beginning of the video
What's your opinion on the GM LS blue springs 19420455 is the current part number I think
Please keep the videos coming. I've looked up before notice the crane no longer makes your part number camshafts from your small block Chevy book do you have those camcards somewhere we can download?
Not Crane. Lunati. They'll make any cam in David's books, and nitride harden it for an extra 100.
Great info.!
Wrong comp cam spring number it’s actually 26981
Man, 8 thousand Dyno pulls!!
Probably closer to triple that or even more, can't imagine them only making 1 pull per cam? Running jets or fuel injection changes, timing changes, header changes. Wouldn't suprise me if were closer to 80,000 pulls and thats pretty damn crazy! Even at 4 pulls per cam, that 32,000 dynamic pulls.
Thanks again
Can you please clean the camera lens before the next video?
With respect to David, this episode reminded me of when Engine Masters swapped hydraulic rollers for solid rollers. Would love to hear David's analogy. Too bad I can't find the complete episode since it was on Motor Trend TV. I guess we'd have to join: ua-cam.com/video/GZTdo2-cGCM/v-deo.html
You basically told me what I already know. Hydraulic lifters in a serious engine suck big time!
I thought you should rest untill you break it! Before manufacturing anything mechanical!
Comp cams = garbage lifters! That’s what they sell.
I have seen way too many stories of Comp cams being shredded after days of driving. They owner fills the engine with high zinc break in oil, runs the engine at 2000-2500 RPM for 20 minutes, and the cam and lifters are still torn to shreds. I have heard some other brands are also trash.