Texas Speed custom cam in my 402 with AWESOME results
12-22-2015, 11:41 PM
#21
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I can see this new cam working better for your set up and goals specifically low/mid range power.
But I might chalk the +8rwhp up as dyno variance, weather etc. Even different running temp during pulls can easily skew 10rwhp. Interesting what you learn with time on the dyno with an electric water pump
Intake Valve closing point at .050 is virtually unchanged.
Provided both cams have 51* duration between .006 and .050 Your DCR should have gone up a pinch. I calculate the old cam at 8.17 where the new cam should be 8.21
Lift is roughly the same
Overlap was reduced by 7*
Exhaust valve opens 2.5* later
But I might chalk the +8rwhp up as dyno variance, weather etc. Even different running temp during pulls can easily skew 10rwhp. Interesting what you learn with time on the dyno with an electric water pump
Intake Valve closing point at .050 is virtually unchanged.
Provided both cams have 51* duration between .006 and .050 Your DCR should have gone up a pinch. I calculate the old cam at 8.17 where the new cam should be 8.21
Lift is roughly the same
Overlap was reduced by 7*
Exhaust valve opens 2.5* later
12-23-2015, 07:24 PM
#22
cam #1 extremely unfriendly to driver & tuner 243/247 .623/.623 114+2
Cam#2 much more friendly, unfriendly to valve train 235/243 .647/.654 114+5
Cam #3 friendly to driver, tuner & valve train 231/243 .637/.627 116+3
Martin spec'd Cam #3, we never discussed the lobe that I remember. The lifters were changed from LS7 to Morel drop in's with this cam.
Cam#2 much more friendly, unfriendly to valve train 235/243 .647/.654 114+5
Cam #3 friendly to driver, tuner & valve train 231/243 .637/.627 116+3
Martin spec'd Cam #3, we never discussed the lobe that I remember. The lifters were changed from LS7 to Morel drop in's with this cam.
12-27-2015, 03:03 PM
#26
I don't.
The cam's specs are hugely important, particularly if all out peak power numbers are NOT a person's primary consideration.
I mean.....48.5* of overlap? For a daily, or often driven car (even a 430ci) that's pretty ridiculous. I, for one, would never consider a build that would require such a cam because I drive all more cars more than I race them.
For me.....a balance of power, drivibility and durability are the most important criteria for any engine build. And if I have to dial back the power for improved drivibility then so be it; that;s what I'll do, and I'll do it by adjusting my cam specs.
KW
The cam's specs are hugely important, particularly if all out peak power numbers are NOT a person's primary consideration.
I mean.....48.5* of overlap? For a daily, or often driven car (even a 430ci) that's pretty ridiculous. I, for one, would never consider a build that would require such a cam because I drive all more cars more than I race them.
For me.....a balance of power, drivibility and durability are the most important criteria for any engine build. And if I have to dial back the power for improved drivibility then so be it; that;s what I'll do, and I'll do it by adjusting my cam specs.
KW
12-27-2015, 03:36 PM
#27
I still want to see a street driven LS3/416 with LS7 smallbore heads. PRC or MAST
12-27-2015, 11:46 PM
#29
I don't.
The cam's specs are hugely important, particularly if all out peak power numbers are NOT a person's primary consideration.
I mean.....48.5* of overlap? For a daily, or often driven car (even a 430ci) that's pretty ridiculous. I, for one, would never consider a build that would require such a cam because I drive all more cars more than I race them.
For me.....a balance of power, drivibility and durability are the most important criteria for any engine build. And if I have to dial back the power for improved drivibility then so be it; that;s what I'll do, and I'll do it by adjusting my cam specs.
KW
The cam's specs are hugely important, particularly if all out peak power numbers are NOT a person's primary consideration.
I mean.....48.5* of overlap? For a daily, or often driven car (even a 430ci) that's pretty ridiculous. I, for one, would never consider a build that would require such a cam because I drive all more cars more than I race them.
For me.....a balance of power, drivibility and durability are the most important criteria for any engine build. And if I have to dial back the power for improved drivibility then so be it; that;s what I'll do, and I'll do it by adjusting my cam specs.
KW
12-27-2015, 11:57 PM
#31
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Thats the thing though, that same cam in a fast intake'd car with 11:1 compression would probably drive like ***. In a 15:1 engine with a tunnel ram, it drives like a baby. The whole point is there is no best answer for a camshaft. It's always a give and take between what you want, and what you're willing to live with. The camshaft doesnt determine every else on your engine, everything else on your engine determines your camshaft.
Your particular setup is not the norm but the exception.
For example: most people don't run 15:1 CR. On the contrary, the majority of setups are pump gas and many are daily drivers.
Also, running a tunnel ram is not common. Most run stock intakes or LSX intakes.
So a monster cam with almost 50* of overlap would be unwanted in the majority of setups here regardless of displacement.
12-28-2015, 12:01 AM
#32
Gotta disagree.
Your particular setup is not the norm but the exception.
For example: most people don't run 15:1 CR. On the contrary, the majority of setups are pump gas and many are daily drivers.
Also, running a tunnel ram is not common. Most run stock intakes or LSX intakes.
So a monster cam with almost 50* of overlap would be unwanted in the majority of setups here regardless of displacement.
Your particular setup is not the norm but the exception.
For example: most people don't run 15:1 CR. On the contrary, the majority of setups are pump gas and many are daily drivers.
Also, running a tunnel ram is not common. Most run stock intakes or LSX intakes.
So a monster cam with almost 50* of overlap would be unwanted in the majority of setups here regardless of displacement.
12-28-2015, 12:07 AM
#35
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I don't visit tech as often as I used to because tech isn't what it used to be 15 years ago.
Oh well ... My intentions for making the thread post was not to argue cam specs but just to share my results. My bad lol.
01-02-2016, 10:41 AM
#37
DIetcoke,
That WOT was pretty wild. lol
That WOT was pretty wild. lol
