Flat tappet to roller cam:

-
RustyRatRod said:
Yeah if you have um. Are they stock iron castings? Ported? Aluminum? Ported? Made outta doodoo? Ported? Not like we know anything.
Click to expand...
As I said in my original post, Edlebrock Performer RPM Heads.

88cc combustion chamber, 6092 Edelbrock Performer RPM heads.

light port/gasket matching and a light bowl polish.

According to the Edelbrock paperwork, out of the box flow numbers are: Valves: IV=2.14/EX=1.81. Intake Runner 210 CC.

Valve LiftIntake Flow (CFM)Exhaust Flow (CFM)
.200~156~119
.300~214~156
.400~250~182
.500~276~205
.600~291~217

I doubt the light port/polish job gained very much, maybe 3-5 CFM per. if I'm lucky.
 
Bullet and Chet Herbert have solid roller cams as well. I have a Chet Herbert for the Chargers next motor. I would recommend what @TT5.9mag said for profile.
 
dukeboy440 said:
As I said in my original post, Edlebrock Performer RPM Heads.

88cc combustion chamber, 6092 Edelbrock Performer RPM heads.

light port/gasket matching and a light bowl polish.

According to the Edelbrock paperwork, out of the box flow numbers are: Valves: IV=2.14/EX=1.81. Intake Runner 210 CC.

Valve LiftIntake Flow (CFM)Exhaust Flow (CFM)
.200~156~119
.300~214~156
.400~250~182
.500~276~205
.600~291~217

I doubt the light port/polish job gained very much, maybe 3-5 CFM per. if I'm lucky.
Click to expand...
I somehow missed that. Thanks. I still stick with my original recommendation for "some kinda" street solid roller.
 
So right now: this is the recommended custom ground profile that's leading the way.

Solid Roller, tight lash cam (6 thousandths), street profile grind
Duration:

240 @ .050 on intake
246 @ 050 on ex

lift: .555/.555 in /ex

110 SA.

2400-6000 rpm range
 
TT5.9mag said:
Who’s recommendation?
Click to expand...
Scheiders

Howards recommendation is very close , just a bit lighter on the lift at .550 on both. Duration was identical.

Hughes, I called and was told they’re not able to cut any right now, could be months due to a shortage of blanks

Isky recommended a 560/570 lift with duration at 246/248


The one constant, everyone i talked to today suggested a 110 LSA.

Still waiting on Bullet and Oregon
 
dukeboy440 said:
Scheiders

Howards recommendation is very close , just a bit lighter on the lift at .550 on both. Duration was identical.

Hughes, I called and was told they’re not able to cut any right now, could be months due to a shortage of blanks

Isky recommended a 560/570 lift with duration at 246/248


The one constant, everyone i talked to today suggested a 110 LSA.

Still waiting on Bullet and Oregon
Click to expand...

The at .050 numbers mean very little without the advertised numbers and the checking height.
 

dukeboy440 said:
Checking height?
Click to expand...

Yes, what lift at the lifter they check the advertised duration.

Sometimes it’s .018, sometimes it’s .020 and sometimes it’s some other lift.

My cam is “checked” at .020 lifter rise. But it lashes at .016 hot.

So the advertised or seat to seat duration is actually different than what the checking height duration is.

I think, without looking at my paperwork my cam is 283 duration at .020 but at .016 it’s right at 280.

The engine “sees” and really runs off seat timing.

An example is my cam (at checking height) is 283 degrees seat to seat, and 255 @ .050.

I can find probably 10 different grinds that are all 283ish seat to seat and they can be as small at .050 as 230 or so.

If you put those two cans in the same engine, my cam will require more seat and over the nose pressure to run to 7k (and not hurt parts) as the other cam would. In other words the other cam would be easier to keep stable.

The other thing is my cam will have higher idle vacuum (all other parameters considered) and it will make more bottom and mid range than the other cam.

It seems somewhere along the way we stopped looking at seat to seat timing and how it affects the engine.
 
dukeboy440 said:
Next stupid question, anyone ran Hughes Mechanical Roller lifters?

I've looked at Morel and Cower, both are on back order at the moment and not expect for2-3 months
Click to expand...
I have not, but rest assured Hughes has not one darn thing to do with them other than making a sale.

Oh yeah and I forgot to address the fact that those heads you have will very likely need the springs changed out to some that match the cam if you go solid, as most of them come with springs for a hydraulic roller if the word roller is involved.
 
RustyRatRod said:
I have not, but rest assured Hughes has not one darn thing to do with them other than making a sale.

Oh yeah and I forgot to address the fact that those heads you have will very likely need the springs changed out to some that match the cam if you go solid, as most of them come with springs for a hydraulic roller if the word roller is involved.
Click to expand...
yep, thats my next stop on the shopping list.

Recommended per Scheider is 180# seat and >400# open
 
dukeboy440 said:
yep, thats my next stop on the shopping list.

Recommended per Scheider is 180# seat and >400# open
Click to expand...
I think their pick is a bit "small" but if you used the word "STREET" then I'd run it. It'll probably sink your eyes back in your head when you mash the loud pedal.
 
RustyRatRod said:
I think their pick is a bit "small" but if you used the word "STREET" then I'd run it. It'll probably sink your eyes back in your head when you mash the loud pedal.
Click to expand...
Yep, street grind, plenty of vacuum. But more importantly, durability and less wear. I talked for about an hour on the phone with the guy. If I break 500 hp, I'm really happy, anything more than that and I'm extremely giddy but not going for max numbers. At this point, the cruising is more my goal than the original road race car I originally set out to build in my 20s... you know, 13 years ago when this journey started.
 
dukeboy440 said:
Yep, street grind, plenty of vacuum. But more importantly, durability and less wear. I talked for about an hour on the phone with the guy. If I break 500 hp, I'm really happy, anything more than that and I'm extremely giddy but not going for max numbers. At this point, the cruising is more my goal than the original road race car I originally set out to build in my 20s... you know, 13 years ago when this journey started.
Click to expand...
You'll like it.
 
RustyRatRod said:
You'll like it.
Click to expand...
I just got done running this in deck top dyno. 5169 HP and 570 ft pounds. Desktop dyno. Not sure how accurate it will be but still.


Crankshaft HP estimate​


RPMTorque (lb-ft)HP
2500470224
3000515294
3500545363
4000565430
4500570488
5000560533
5500535560
5800515569
6000495565
6200470555
6500435539
 
dukeboy440 said:
I just got done running this in deck top dyno. 5169 HP and 570 ft pounds. Desktop dyno. Not sure how accurate it will be but still.


Crankshaft HP estimate​


RPMTorque (lb-ft)HP
2500470224
3000515294
3500545363
4000565430
4500570488
5000560533
5500535560
5800515569
6000495565
6200470555
6500435539
Click to expand...
Over 5000HP but that torque is low in comparison.
 
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