340 dyno chart thoughts
Here Is a visual reference to show the difference between the camshaft OP is using and the cam YR suggested. The triangle shape between the two lobes is overlap. The faster lobe ramp rate helps slightly, but as you can clearly see there is a LOT more overlap area in the MP cam YR suggested compared to OP's cam.
This was done on engine analysis software which retails $499 USD, So you be the judge of it's accuracy.
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Then install the ****** 4-6* ahead. What don't you get? What I'm saying is exactly what you are either too stupid to understand or you don't want to LEARN.
We are talking two cams with relatively low overlap. If you can't make a 284 MP idle and be streetable you need to quit and go golfing.
You still have NOT explained why I can use 255 at .050 and get idle and vacuum that YOU can't? I posted my numbers. It's even on a 105 LSA. That's at least 5* ahead of what you think is the greatest thing since pussy.
Cams have come miles and miles and it's stupid to contend that a ******* passenger car head needs anything wider than a 108 is pure ignorance. And YOU continue to preach ignorance. Youre so ate up by the numbers that you can't see the numbers. ******* crazy.
Now I'm going to post WHY comp, the crap company that it is, decided 110 LSA was the best thing since pussy and it had ZERO to do with performance.
As comp grew in size to the monolithic sloth it is today, they had to do what crane had already done...own a company that made cores. If you are grinding cams at the rate comp does, you can't wait on cores. I don't recall all the machinations that went on, but comp ended up either buy a core company or went into an exclusive contract with a supplier. Now comp had all the cores it needed, all the time.
Since most HFT and SFT cores are cast iron, they are EXACTLY THAT.....cast. The lobes, and therefore POTENTIAL LSA's are already there. We all KNOW that there are times when a 100*LSA or maybe even a 98* LSA is called for. On the other end of the spectrum, especially with the onslaught
of power adders, and specifically turbos, the LSA naturally has to get wider. A mild BB turbo engine may call for 113-114 LSA. I've seen as high as 120 LSA on a turbo alky deal, but it was well over 500 CID.
So, between, let's say, 102 and 114 LSA is where most cams will fall. To make a core that will take that spread is very expensive. And, it takes longer to grind. Unless you are somewhere in the middle. So the marketing jerks got with the engineering nerds and THEY decided for COST and PRODUCTION that 110 LSA would be the de facto standard. Comp had now birthed, blessed and baptized the living abortion of the production LSA.
It saves money because the cores can be made with less LSA split between them. It took less time to grind. They could make bank. Now the marketing pukes had to sell it, and so a media blitz raised from the pits of the marketing sewer. And all the sheep went to the slaughter. With them , they brought multiplied sheep, ripe for the killing by regurgitating this vile lie. But who cares? Money is made, they average guy is happy with "what he has" because he doesn't test, and engine builders are happy because they can stock a few generic junk **** cams and the customer will swallow them down like a 2 dolla ***** on a three piece suited John.
In 2016 and beyond, it has become almost impossible to get a core that will go tighter than 107. 106 is a push. Anything narrower than 106 and you are pretty much **** out of luck, unless you are somebody who is somebody. Engine builders no longer want to spend time trying to reeducate the customer from 3 decades of marketing stupidity. So they give the customer what he wants, even though the customer, most of whom are just casual with the hobby, have no ******* idea what they want, let alone what they need.
So engines are underachievers, and all the fools applaud and say bravo to an engine that is down on power, down on torque, has the torque curve too wide and makes RPM like a flat head ford. Yes, bravo indeed.
The facts are it's not just me bitching about guys giving up power. I PAY for power. It's what I expect. Many people for years have been trying to overcome the inertial ignorance that comp has blow right up our collective asses. It's not just me.
But just like the church of Scientology, it's hard for folks to admit that what they are doing is wrong, at least from theperspective of performance. All leave the religion of it to the rest of the Gentiles to argue out.
The LSA triangle is the single most misunderstood, misapplied and abused function of cam timing I can think of. And that's because it starts with your CYLINDER HEADS. Nothing else. If you can't make that connection, I can't help you. Every single cam event is based on YOUR cylinder heads, induction and exhaust system.
Sorry for the long, sometimes gruff rant. But it is stupid to keep hashing over numbers when ONE guy takes everything LITERAL and types a tome on the nuances of his pet theories.
With that in mind, I take BACK my comment for the OP to use the 284 MP cam. F-T-P says it will never work, so therefore, it is so.
I will go back to what I always have said. Buy a CUSTOM CAM. Don't get ate up by the LSA if it is more narrow that what the brainwashed masses claim is de facto. Rise above their ignorance. The earth is NOT flat. Never was. You have been duped by production oriented manufacturing and Madison Avenue pukes.
It's time to leave the dark ages of cam timing and get to the light.
