65CC heads and .600 lift cam clearance?
12-30-2017, 12:41 PM
#21
You can run the same lift cam and have a 0 deck setup and a .012 deck setup and have worse ptv on the latter. No matter the lift. Same with the other 2 options.
There is no need to be insulting like that for what he said. Plus, on the internet, everyone is an expert.
12-30-2017, 02:16 PM
#22
Id say ptv is more directly related to ptd, head gasket thickness, or milling of the cyl head than lift if you want to argue exaggerated semantics.
You can run the same lift cam and have a 0 deck setup and a .012 deck setup and have worse ptv on the latter. No matter the lift. Same with the other 2 options.
There is no need to be insulting like that for what he said. Plus, on the internet, everyone is an expert.
You can run the same lift cam and have a 0 deck setup and a .012 deck setup and have worse ptv on the latter. No matter the lift. Same with the other 2 options.
There is no need to be insulting like that for what he said. Plus, on the internet, everyone is an expert.
How do you sheep not comprehend this most basic of concepts.
12-30-2017, 03:04 PM
#26
That is a huge exaggeration of a rather small measurement. PTV is literally the closest distance between the piston and the valve, not the farthest. That is the universally accepted definition.
Arguing anything more than that one measurement is only tryin to argue semantics to make you right.
12-30-2017, 03:35 PM
#27
It reall seems like you are the one reaching...all the way to the bottom of the cylinder, for your definition of ptv.
That is a huge exaggeration of a rather small measurement. PTV is literally the closest distance between the piston and the valve, not the farthest. That is the universally accepted definition.
Arguing anything more than that one measurement is only tryin to argue semantics to make you right.
That is a huge exaggeration of a rather small measurement. PTV is literally the closest distance between the piston and the valve, not the farthest. That is the universally accepted definition.
Arguing anything more than that one measurement is only tryin to argue semantics to make you right.
? PTV clearance is literally the distance between the piston and the valve.
Drugs must be good in china land.
Lets do some basic math. If clearance between piston and valve is .070 at the closest point, if lift was increased by .050 at that point (whatever or wherever it may be), then the valve would be .015 into the piston, or would make contact. See how that works?
12-30-2017, 03:56 PM
#28
Are you also going to pretend that no other parameters effect ptv? Because that is what shouldn't have to be explained to you.
Lets try some other simple math. Using the same cam with the same lift, one engine has a piston that sticks .012 above deck and the other is at 0 deck. Which one has better ptv?
Lets try some other simple math. Using the same cam with the same lift, one engine has a piston that sticks .012 above deck and the other is at 0 deck. Which one has better ptv?
12-30-2017, 04:57 PM
#29
Are you also going to pretend that no other parameters effect ptv? Because that is what shouldn't have to be explained to you.
Lets try some other simple math. Using the same cam with the same lift, one engine has a piston that sticks .012 above deck and the other is at 0 deck. Which one has better ptv?
Lets try some other simple math. Using the same cam with the same lift, one engine has a piston that sticks .012 above deck and the other is at 0 deck. Which one has better ptv?
12-30-2017, 07:55 PM
#32
3That is where you would be wrong also.
Ignoring icl, lsa, and duration is pretty laughable.
For someone that knows more than us, you should also know that a cam can have more lift but the same ptv or better where ptv is always measured.
I didnt pee in your post toasties but maybe you should find out who did.
PS dont forget about normally using smaller base circles to achieve more lift in a given space....or the possibility that a lobe has less lift at other durations vs peak lobe lift.
Ignoring icl, lsa, and duration is pretty laughable.
For someone that knows more than us, you should also know that a cam can have more lift but the same ptv or better where ptv is always measured.
I didnt pee in your post toasties but maybe you should find out who did.
PS dont forget about normally using smaller base circles to achieve more lift in a given space....or the possibility that a lobe has less lift at other durations vs peak lobe lift.
12-31-2017, 11:45 AM
#33
3That is where you would be wrong also.
Ignoring icl, lsa, and duration is pretty laughable.
For someone that knows more than us, you should also know that a cam can have more lift but the same ptv or better where ptv is always measured.
I didnt pee in your post toasties but maybe you should find out who did.
PS dont forget about normally using smaller base circles to achieve more lift in a given space....or the possibility that a lobe has less lift at other durations vs peak lobe lift.
Ignoring icl, lsa, and duration is pretty laughable.
For someone that knows more than us, you should also know that a cam can have more lift but the same ptv or better where ptv is always measured.
I didnt pee in your post toasties but maybe you should find out who did.
PS dont forget about normally using smaller base circles to achieve more lift in a given space....or the possibility that a lobe has less lift at other durations vs peak lobe lift.
The only variable that changed in your imaginary scenario is the block being decked .012 - this results in .012 less static clearance (less the valve angle) between the piston and the valve versus the block being not decked, period.
Now your argument is "well what about xyz blah blah blah"
It doesn't matter. There is .012 less clearance (less valve angle), regardless, if nothing else changes between the setups. Might I suggest playing in traffic.
12-31-2017, 11:51 AM
#34
You are wrong about the whole "there is x less ptv everywhere due to having y lift more"
You should be smart enough to realize why. You should also have a better grasp on lobe design, but i guess im only taking you at your word that you are smarter.
When you are the only one arguing your point vs everyone else, maybe they arent the ones that are wrong.
Maybe hubris should be on your new years resolution as well as better manners.
You should be smart enough to realize why. You should also have a better grasp on lobe design, but i guess im only taking you at your word that you are smarter.
When you are the only one arguing your point vs everyone else, maybe they arent the ones that are wrong.
Maybe hubris should be on your new years resolution as well as better manners.
12-31-2017, 12:02 PM
#35
You are wrong about the whole "there is x less ptv everywhere due to having y lift more"
You should be smart enough to realize why. You should also have a better grasp on lobe design, but i guess im only taking you at your word that you are smarter.
When you are the only one arguing your point vs everyone else, maybe they arent the ones that are wrong.
Maybe hubris should be on your new years resolution as well as better manners.
You should be smart enough to realize why. You should also have a better grasp on lobe design, but i guess im only taking you at your word that you are smarter.
When you are the only one arguing your point vs everyone else, maybe they arent the ones that are wrong.
Maybe hubris should be on your new years resolution as well as better manners.
Use your brain little man. Keep digging a hole. Tech hasn't had this clueless a sponsor since TByrne was kicked from the page.
12-31-2017, 12:06 PM
#37
Piston to valve is a literal measure of distance between piston and valve, the amount of distance the valve coming out of the head is literally the lift of the cam at any point in the rotation. You're still grasping straws with a bad and incorrect argument. Lift directly determines PTV, at any point in the cam's rotation, period.
How do you sheep not comprehend this most basic of concepts.
How do you sheep not comprehend this most basic of concepts.
Clearly you didn't read, no one said x less ptv everywhere due to y lift. I said x less ptv due to y DECK OF BLOCK (or, in your scenario, piston out of hole) since there is physically that much less space between the piston and valve. The cam lift isnt even part of the equation.
Use your brain little man. Keep digging a hole. Tech hasn't had this clueless a sponsor since TByrne was kicked from the page.
Use your brain little man. Keep digging a hole. Tech hasn't had this clueless a sponsor since TByrne was kicked from the page.
12-31-2017, 12:08 PM
#38
You're tying two completely seperate scenarios that YOU posted that I responded to together, when they aren't related at all. I can only point out your incorrect information one post at a time. Would you like me to make an incorrect information family free for you so it's easy for you to comprehend/read?
12-31-2017, 12:08 PM
#39
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"There's battle lines being drawn, Nobody's right if everybody's wrong"
Buffalo Springfield
It doesn't matter at what point a piston to value clearance issue may occur. A measurement is made by making a full rotation for all the obvious reasons. Anyone only measuring at TDC is doing it wrong. If a valve interferes with the piston it is bad and doesn't matter at what degree it occurs.
Buffalo Springfield
It doesn't matter at what point a piston to value clearance issue may occur. A measurement is made by making a full rotation for all the obvious reasons. Anyone only measuring at TDC is doing it wrong. If a valve interferes with the piston it is bad and doesn't matter at what degree it occurs.
Last edited by Duntov1967; 12-31-2017 at 12:14 PM.
12-31-2017, 12:17 PM
#40
You're tying two completely seperate scenarios that YOU posted that I responded to together, when they aren't related at all. I can only point out your incorrect information one post at a time. Would you like me to make an incorrect information family free for you so it's easy for you to comprehend/read?
Besides you are wrong on the "one at a time please" scenario of the 0 deck block. I had the cam advanced 15 degrees on the 0 deck block. It has less PTV. You did not ask enough questions and your ignorance failed you.
So clearly you need to step back and cool your temper and learn instead of preach.
You are only showing how short tempered and short sighted you become when challenged by even the tiniest bit.