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On that Comp P.C Link they have many Camshaft as you said the one Look a Lot Like Yours . There DE Cams are a Match to some of the Blue Race Grind's . Now on your 882 Heads did you remove the EPA intake port corners ? Or just Clean up the Exhaust Ports . Any Valve Pock Porting done ? With your Camshaft Card and this Cylinder Head info I can check your Build .
What # is that Blue Racer Camshaft ? Ok here is your Crane Blue Racer Part# 975213 no Longer made . At .050 it's Dur is 194in / 204" ex and its Lift is 398"in / 420"ex with a 112 L/S . As you said just a slight step above the GM 390" / 410" Stock Grind . First you do not have to worry about valve Clearance with that Grind even with 1.6" Rockers . It's a Very Mild Camshaft but will make real good Power down Low . I will see what H.P#s I can come up with . That RPM intake is more then what is needed for this Build .
Here is what I came up with . 298.8 H.P at 4200 RPM's and 413.1 Ftlbs at 3000 RPM's . If your Looking for max H.P . That Camshaft is on the Small Side . Yes the 1.60 Rockers would Help this Build make more Power . But all and all it's not a Bad Street car Engine . Dial in that 600 Holley and HEI and you will Like it .
Thanks Tango! While the heads were polished on the exhaust side the intake ports were left untouched. The old Blue Racer numbers are CD194-11C 975213 and it is the lowest performance cam on the list at:
http://www.cranecams.com.au/pdfs/blu...et_14-5-07.pdf
This goes back to discussions I had with Tech1 on cam selection for low rpm torque and maybe mpg also. Can you tell me more about how you used the Comp Cam simulator? Also can you provide a list of rpm, torque and HP in say 500 rpm increments? Thanks again. Does this mean that I can eventually use the Comp Cam simulator for other cams as well?
Don Shillady
Retired Scientist/teen rodder
You need to work with that Comp Cam P.C Dyno . There are many Options that can be made when checking your Builds H.P and Torque #s . Some of there Camshafts Like the DE Cams are the same Grind as other Brands . Then you have other Grinds that are a Near Match to Different Brands . As for Power #s they show Max H.P and Torque #s only . What is Nice about there Dyno . They Show what They think is the #1 Camshaft Pick for your set Build . For me I buy mostly ELGIN Brand Camshafts because of the Great Price they are sold For .
Tango, Thanks a lot for your assistance. I have bookmarked your site.
Don Shillady
Retired SCientist/teen rodder
Don, it has been my experience on the DynoSim that there is little difference between the power/torque made with 1.6 over 1.5 rockers. You can generally find more of a difference by advancing or retarding the camshaft than you can with different rockers. Anyway, here are the figures with everything the same as the last DynoSim except using 1.5 rockers.
RPM HP TQ
1000 49 259
1500 93 327
2000 134 352
2500 171 360
3000 223 391
3500 270 405
4000 305 401
4500 331 389
5000 336 366
5500 327 313
Here is the sim with 1.6 rockers for comparison....
RPM HP TQ
1000 49 259
1500 93 327
2000 134 352
2500 172 361
3000 224 392
3500 271 406
4000 307 403
4500 336 392
5000 340 370
5500 332 317
With that Camshaft them #s are on the High Side . It will Fall off at the RPM's you listed . Yes the 1.60 Rocker can Make up to 20 More H.P on that builds . Also them EPA Blocked intake ports are a H.P Killer . Your right at 300 H.P . The 1969-70 350 300 HP Chevy Engine had a Camshaft that was just a bit Smaller 390" / 410" But had 10.25.1 C/R and better Flowing 1.94" / 1.50" Heads with a 750 Q-Jet Non EGR Intake 300 H.P at 4800 RPM's with 380 Lbs at 3200 RPM's .
Thanks Tango and Tech1! It would seem I have a rebuilt SBC 350 which I will think of as a 300 HP/ 400 ftlb motor. I think that is what is needed for touring on Interstates at 65+ mph with an aerodynamic brick of a Model A with fenders. I am concerned about the pushrod holes and at present I do not plan to remove the heads for further work, although that is possible in the future. As soon as we have a reasonably warm day I will probably install the 1.5 roller-tipped rockers and take what I can get. It is obvious to me that a rod is never really "done" and future modifications could occur without changing the cam such as Vortec iron or Corvette aluminum heads but for now I think it is best to get it running. There was a long delay due to not knowing what cam I really have but you guys have cleared it up pretty well, Thanks!
Don Shillady
Retired Scientist/teen rodder
Tech1, I am working on a poster to give details if I attend any local shows this summer with my '29 roadster and I want to use your Dynosim results for my engine. In going back over this old thread I wonder about the 5000 rpm HP. Using the formula: HP=(ft. lb. torque/5252)x(rpm) your HP and torque values check at 3500 rpm but I don't understand the Dynosim results at other rpm. Can you check that old Dynosim chart so I can put your name after the data on my poster?
Well further checking shows using your numbers that at 5000 rpm I get
(366/336)x(5000)=5446 instead of 5252 so I guess that is within the uncertainty of the simulation.
So 336 HP is reasonable and on the low side at 5000 rpm but if I use the 5252 constant I get
(366x5000)/5252 = 348 HP. I have looked at the Comp Cam dyno charts and calculated the constant and they showed the same 5252 +/- 200 so I guess you need very precise dyno values but the theoretical value of 5252 does show up in the crossing points in the Comp Cam dyno charts. At 5500 rpm we should be past the 5252 crossing point and here I get
(317/327)x(5500)=5332
Apparently the Dynosim program arrives at the HP and Torque values seperatley. If I were writing the program, as I did write programs for many years, I would have just calculated one or the other of the HP or Torque values and used the 5252 constant to get the other value. As far as I know in a real dyno Torque is measured and then the formula is used to calculate HP using the 5252 constant so the experimental dyno chart should come up with the 5252 constant but the simulation apparently uses internal formulas for HP and Torque individually.
Don Shillady
Retired Scientist/teen rodder