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Which cam?

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Engine builder RV cam with LC engineering header, 2 1/4" exhaust, and Flowtech purple horny mufler. I am quite happy with the engine. I did the Header and Cam atthe same time, so I couldn't tell you how much of an improvement each mod made but together they seem to have increased my engined power and responsiveness.
 

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VT_Toy said:
It'd be useful for any replies to list other mods too, as it's all a related system.
I've posted here before on this subject. Relative to 4-wheeling, generally speaking, from off-idle to 2500 or 3,000 RPM torque is the key to good performance. If you are mud bogg'n or most of your wheel'n requires your throttle response at a higher RPM, then you might consider a different cam profile with longer duration. The following data was generated based on a target for increased in torque for a "crawler" type vehicle. For about 3 years I've been "dyno testing" every camshaft I could find for the 22s, using a reputable desktop dyno software. This data uses the 1985 22R specs (80d F ambient temperature, 1000 ft elevation (in a normally asperated engine you lose about 4% HP and torque for every 1,000 feet climb in elevation), 91 octane fuel, and 20% RH), so the actual numbers for a 22RE will be slightly higher, but parallel. How accurate is it? I don't know, I've never engine dyno'd a 22, but I know several professional engine builders and dyno shops that use the software to do "mock pulls" as they pre-test changes. I've heard that it is accurate to about 1%, but it does make some assumptions. As you look at the numbers, one thing that is interesting is the stock 22R cam is actually a very good cam profile. Notice the torque from off-idle to about 2200 RPM. The stock exhaust and stock cam produces better torque... that's good if you are "crawling". The header comes on at about 2400 RPM. Adding a 252S CompCam cam and the tri-y header the numbers jump up. So if you just added a header and exhaust, you'd lose a tad of torque below 2200 RPM. Adding the cam, you gain it back plus a little more. "Flow" is very important. Another interesting fact about the data... many cam suppliers/manfacturers like to push their longer duration profiles, this is good if you need your power at higher RPMs (4,500 and above), but you generally sacrafice badly needed low-end to mid-range torque. So when camming an engine you usually make a trade-off and you need to ask yourself where in the RPM range do you want your torque to be? Since my 22R was also my daily driver, I wanted my power in the 2,000 to 3,000 RPM range, that's were I drove mostly. And I especially wanted more power (torque!) at freeway speeds between 65 and 75 MPH. The tri-y header (DT) and opened exhaust will get you about 10% increase, adding a good low-end camshaft (CompCam 252S or EB Crawler 261) will get you about another 8%. So you take a stock 22RE from 116 HP to about 137.8 HP. That's a nice increase for an under $400 bolt-on modification, excluding what you'd spend for your exhaust tubing, cat, and muffler. All this, I'm sure is arguable. I'm not an engine builder, and I make no claims as to the validity of this data, but in the absence of any REAL certified dyno test data, it does provide some degree of comparison for various cams and their torque and HP numbers. That's just my humble opinion.
Gnarls.

22R - Stock Exhaust - Stock Toy Cam:
1000 RPM – 59.3 brake tq, 11.3 brake HP
1200 RPM - 74.8, 17.1
1400 RPM - 89.3, 23.8
1600 RPM - 102, 31.1
1800 RPM - 110, 37.7
2000 RPM – 115, 43.9
2200 RPM – 121, 50.8
2400 RPM - 126, 57.8
2600 RPM - 129, 63.9
2800 RPM - 130, 69.5

22R – Stock cam, Thorely Header, 2.25" free flow exhaust
1000 RPM – 50.6 brake tq, 9.6 brake HP
1200 RPM - 66.1, 15.1
1400 RPM - 80.7, 21.5
1600 RPM - 96.9, 29.5
1800 RPM - 107, 36.7
2000 RPM – 114, 43.6
2200 RPM – 123, 51.4
2400 RPM - 129, 59.1
2600 RPM - 134, 66.5
2800 RPM - 139, 74.1

22R add CompCam 252S:
1000 RPM – 62.0 brake tq, 11.8 brake HP
1200 RPM - 77.9, 17.8
1400 RPM - 92.8, 24.7
1600 RPM - 106, 32.3
1800 RPM - 115, 39.4
2000 RPM – 121, 46.0
2200 RPM – 128, 53.5
2400 RPM - 134, 61.1
2600 RPM - 139, 68.6
2800 RPM - 142, 75.1

22R with EB Crawler 261:
1000 RPM – 51.4 brake tq, 9.8 brake HP
1200 RPM - 66.8, 15.3
1400 RPM - 81.6, 21.7
1600 RPM - 97.5, 29.7
1800 RPM - 108, 36.9
2000 RPM – 115, 43.8
2200 RPM – 123, 51.6
2400 RPM - 130, 59.2
2600 RPM - 135, 66.7
2800 RPM - 139, 74.2

22R with Erson 268:
1000 RPM – 50.0 brake tq, 9.5 brake HP
1200 RPM - 65.7, 15.0
1400 RPM - 80.1, 21.4
1600 RPM - 96.1, 29.3
1800 RPM - 107, 36.6
2000 RPM – 115, 43.6
2200 RPM – 123, 51.4
2400 RPM - 129, 58.7
2600 RPM - 135, 66.7
2800 RPM - 139, 74.0

Stock 22R…….PK Tq 130, Avg Tq 106, Pk HP 69.5, Avg HP 40.7
Tri-Y Header…Pk Tq 139, Avg Tq 104, Pk HP 74.1, Avg HP 40.7
CC252S…….….Pk Tq 142, Avg Tq 112, Pk HP 75.6, Avg HP 43.1
EB 261…..…….Pk Tq 139, Avg Tq 105, Pk HP 74.2, Avg HP 40.9
Erson 268….. Pk Tq 139, Avg Tq 104, Pk HP 74.0, Avg HP 40.6
 
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