That doesn't sound very good does it?
Did it measure 215 @.050?
You can usually compute the ICA from the Duration and the ICL (installed centerline)
Say you install it 4 * advanced at 108;( hyup 112 less 4 =108,I checked it this time,lol)
So in at 108, just take 215 over 2, less 108, and add that to a full circle or 360* ,and then subtract the intake duration.Subtract that from 180, and This is how it looks;
180 less[{(215/2 less 108) plus 360{ less215] =180 less (.5 +360-215)=34.5
But as you can see, this is the .050 spec. You got 36 and spec is 36, so they are not wanting a 108 install.
When you get down to those very small lift measurements, it gets really tricky to measure. You more or less need a solid lifter, or a hydro with the cup blocked to the top. And checking springs are preferred. Otherwise you can't be sure the lifter is not bleeding down.
However 269 less 215 = 54* ramps and that is borderline ridiculously slow ramps from a company that advertises fast-rate,made for-.904-lifters, hype.
So let's suppose your measurements are bang on, and you put that into an 8/1 teener. Your 35*ICA translates to a 107.5ICL, and that translates to an ICA of 62 with a 269 Adv.
1) So in at 107.5 and an ICA of 62 here it is;
Static compression ratio of 8.0:1.
Effective stroke is 2.61 inches.
Your dynamic compression ratio is 6.51:1 .
Your dynamic cranking pressure is 121.91 PSI.
V/P (Volume to Pressure Index) is 93...........................................................93
As you can see from the numbers this s gonna be a real dog off the line and all the way to 3000rpm or more. To correct this the first go-to is compression. Here is the exact same combo at 10/1
2) Static compression ratio of 10:1.
Effective stroke is 2.61 inches.
Your dynamic compression ratio is 8.09:1 .
Your dynamic cranking pressure is 162.22 PSI.
V/P (Volume to Pressure Index) is 124.........................................................124
Notice the cylinder pressure is at the max for a tightQ engine and pump gas. Also that the VP has climbed to 124 which is 124/93= plus33% stronger off-the-line performance.
3) now let's compare that to the stock 318 with the 240/112 cam, ICA of 48*
Static compression ratio of 7.9:1.
Effective stroke is 2.89 inches.
Your dynamic compression ratio is 7.02:1 .
Your dynamic cranking pressure is 134.74 PSI.
V/P (Volume to Pressure Index) is 112.................................................112
ok, so now you can see that your off-the-line is 124/112=plus10.7% better than the stocker. Instead of 93/112= 17% weaker!
And that's just with a compression change.
However, in this case, because of the slow ramps, this may not be totally accurate, cuz nothing ever really happens until the valve is up in the .050 region, which is why cams have that standardized spec.
But what does happen is at the overlap cycle. You measured that 215 to be a 269 which is a 54 * ramp allowance, If you add that same 54* to the 223 exhaust side then you come up with a 269/277/112 cam, and that has
(269+277)/2 less (2x112) =49 degrees of overlap! That's a lot! for such a small cam, and it does two things; one we like is the idle lope;and one we don't, and that is to allow the piston to push,at low rpm, some of the inducted charge back up into the intake. This makes for terrible fuel consumption when operated in this zone........which is what streeters do most of the time.And;just to remind you, the 69 340 cams had 44* of overlap, and perhaps you remember what those idled like.And perhaps you remember the lousy fuel-economy those cams had.And thinking about it, your cam has very similar specs to that 340 cam which was 268/276/114, compared to your possible 269/277/112,DOH!
Now If you were to ask me; If I had a cam with a 269 intake duration I would want 269* worth of performance, and this cam will not deliver.(Hang on, that is not totally accurate. It will not deliver a bottom-end, and it will not deliver a midrange, and it will not deliver any reasonable fuel economy. Now, it will give good passing-gear power if geared right, and it will have a bit of a "poser" idle lope). In fact I have shown that at the factory compression ratio,it will be a dog off the line; the VP of 93 clearly shows that. You will need a very un street-friendly TC and decidedly large rear gears to get anything but a very light car, moving. Ima thinking a 3000TC and 3.73s minimum, and don't be checking the fuel consumption,lol. The 3000 will get you past the soft part, and the 3.73s will help her get to the power in a reasonable amount of time.3.73s and 3500(where the power will begin), makes 28 mph. See what I mean?
Ok maybe a 2800 with those 3.73s,lol.
Now if this is a 10/1 engine, the VP clearly shows an improvement in the take-off department, and Ima thinking the stock TC , while @1850ish is a bit low, non-the-less it will get moving. And I still wouldn't try her with 2.73s if I was looking for oomph, but rather 3.23s, at the very minimum.
It is for this very reason that I won't be buying another Hughes cam, until they start publishing comparative advertised durations.
Now before you get too discouraged, go back and remeasure with a locked up lifter and an adjustable pushrod,lol. If your lifter bled just a few thou, it will really mess up ALL your measurements. The fact that she measured right, at .050,tho, leads me to believe your advertised measurements.
Yeah, my heart is crying for you too.
And here's a freebie. Lets say you found a 215/223/106 cam. I say 106cuz this is a 1-gear for performance combo, right;no racing. And let's say the ramps were a more reasonable 40 degrees, making this a 255/263/106 cam. And say you had a 9.2 Scr, OK in at 102, the ICA is 49.5, and, we get
Static compression ratio of 9.2:1.
4) Effective stroke is 2.87 inches.
Your dynamic compression ratio is 8.10:1 .
Your dynamic cranking pressure is 162.48 PSI.
Your effective boost compression ratio, reflecting static c.r., cam timing, altitude, and boost of PSI is 8.10 :1.
V/P (Volume to Pressure Index) is 136.........................................136!
Ok now yer talking VP! 136/112= plus 21.4% over the stocker, and TONS of teener torque, and the 255 will make a similar average power to your Hughes cam, but because of the tighter LSA will make a bit more specific power, at the expense of the powerband, so like I say, a 1-gear runner. Use with a 2800 and 3.23s and she will blast to 56mph at 5800 with 27s . And with 49* of overlap, will sound just like the Hughes and suffer the same lousy fuel economy, while screaming the tires all the way to redline. Oh yeah and she requires premium gas when heavily loaded. Unless you have tight quench, then maybe not.
