Hey All! Would anyone who knows their specific dyno numbers care to share them and their engine builds with us so those without dyno time can accurately gauge what we have? Please include: overbore cam specs - lift and duration @ .050" intake type carb cfm header type compression ratio head type piston type ignition type and anything else to help us get an idea of what we have... ???o No:
overbore---------------.038 cam specs--------------308 s intake type-------------Port matched SP1 carb cfm-----------------Unmodified Holley 850 dp header type------------1-7/8" compression ratio-----11 to 1 head type---------------Ported Stage 1, 285cfm int piston type-------------Ross forged ignition------------------Msd dist, 6al This combo made 545 hp and 542 lbs/ft on the engine dyno Ken
ken, How about posting the dyno sheet. It would be interesting to see how much power your engine was making at other than peak numbers. Brett
The cam specs are as follows: 276/282 solid cam at .050 on a 112 lobe sep, .600 lift on the intake and .594 exhaust. I don't have the dyno sheet with me now (I am at work right now) I will post it when I can. It made 545 horsepower at 5700 and 543 lb/ft at 4700 rpm. It went over 500 lb/ft at 3600 rpm and was over 500 hp by 4800. Jim Burek built it for me and said there is some more power in it. Limiting it right now is the box stock 850 dp and he said it will rev higher but I shouldn't with the Buick rods in it. Ken
Buick Motorsport plaque?? Ken, I like the Buick Motorsport plaque on your fan shroud. Is this something you had made up, or is it something that is readilly made that one can purchase somewhere?
Yardley, Good topic. I'll give you mine and hope for some feedback to increase HP a bit. Bore: .030 Cam: 215/225@ .050 Lunati grind from GSCA Manifold: Edelbrock Performer Carb: Holley 750 vacuum secondaries Header: none, stock manifolds Compression: 9:8 to 1 Heads: 73 model year, shaved .020, and bowls polished. A little porting as well. Pistons: Poston hyperteutectic 10 to 1 Ignition: Stock, with Pertronix Ignitor Peak Hp is 364 @ 4750 RPM Peak torque is 474 @ 3850 RPM Since the car is a convertible, I want to keep the stock manifolds and leave headers to you hardtops guys. The 750 Holley has to be holding me back as well. Russ Waters 1970 Skylark Convertible 455
Looking good guys! I'm plugging in the #s into Dyno2000 to see how accurate it is. Ken, beautiful engine! Now all you need is an NOS $700 washer box on your fender to replace that weathered one and under hood will look as good as new...:laugh: :laugh: :laugh:
Hey Ken, where's it degreed at? + - * ??? That makes a good change in the #s in the program. Russ, what's the lift on the cam? And where is it degreed? + - *? And porting or even just port matchinjg that Performer will pick you up a few free HP... Thanks All!!!
Ken, Dyno2000 shows, with your cam +2*, 546HP@6500 and 487 lb ft at 5500. Looks like the #'s in this program are close on HP, but showing it too high, and torque #'s are way low (a hair over 10%). This is what I saw on another build also - 11% low on torque. HP was real close.
Hey Russ, similar for you. Dyno2000 shows you have 356HP@5000 (2% low) and 432 lb ft @3500 (10% low). RPMs were closer. Thanks guys. It looks like 2% HP and 10% torque are common low #'s with this program.
Jeff, I just read the post from Jim Burek recommending we ditch the vacuum secondary carbs. He thinks an 850 Demon would make my engine a better performer. Can you plug that carb into your program and see any changes for me? Another point Jim made and was proven correct was: Slow opening of vacuum secondaries don't allow HP buildup until higher RPM. My dyno sheet proves this! I will get the numbers off of it tonight and show everyone what he means. I cannot find my cam card so I can't give any more accurate info on it. Someone at the GSCA could though, so I should call them soon and get that. Russ
Jeff, I've noticed the same problem with Dyno. Sims always make assumption and Dyno 2000 uses some pretty Happy Air. It assumes a local density equivalent to sea level if I'm not mistaken. You can compensate by reducing the head flow rates by a slight fudge factor which you can easily determine from 2 or 3 samples. Anyone got an idea on where I can change the air specs for Dyno 2k?
Eric, I made up the plate for the fan shroud 5 or 6 years ago to cover up some damage on the shroud. It is polished stainless steel, uses 3 stainless allen bolts to hold it on and the decal I bought at a car show. Thanks for the compliment. Yardley, Thanks for the compliment. A $700 overflow is most definitly not in the future for this car! Eventually, I may make up something out of aluminum. Ken
Bore: 430 std. Cam: GS116 Lift .479/.493 Dur. 220/230 @.050 Intake: Edelbrock Performer Carb: Holley Spreadbore 650 D.Pumper, Mech Sec. Exhaust: T/A Shorties Compression: Calculated Actual 8.9 to 1 Heads: Stock 69cc 1968 400 heads Pistons: Cast Badgers advertised 10.2 to 1 Ignition: New Points Distr. converted to pertronix and recurved 30degrees plus static all in at 2700. - Peak Hp-326@4550rpm Peak torque- 425@3600rpm
Russ, I was wrong with my 1st post with respect to your #s. I hadn't set all the factors - I was distracted. Serves me right for messing with this stuff at work... Dyno2000 says your build should be 317HP @ 4000 and 461 lb ft @3000 It is low 50HP and 17 lb ft. But it is hard to say with the stock Buick heads and all. This program is probably only using basic Chevy examples. The switch to an 850 only shows 2HP and 2 lb ft improvement at the same RPMs. I doubt that is correct. I'm just trying to see how close this program is to the real thing, and in every instance it is coming up low, where the real #s are actually higher. Yards
Here is my old motor. .038 over buick 455 KB intake 1050(dyno numbers are with a thermo) KB big HYD cam 270/280 @ .050 .542/.542 lift Iron Stage1 heads flow numbers(255ish int/170ish ext) 13.00to1 comp flat top Steel rods KB headers KB roller rockers MSD 6al with locked out dist. Timing was set at 34 degrees. It took over 20 or so pulls to get these numbers, the first pull was only like 510hp Engine dyno'ed at 597HP@6400 and TQ was 530something@4800 or 5000 The bottom end of the engine is Dmoore's avtar
Well, there is bound to be one... Of the 5 I've checked, Len's comes in on the flip side... Dyno2000 reads high, saying HP 329@4500 vs 326, and Tq 455@2500 vs 425 actual. But so far with ported Stage1 heads the numbers are low on the PC vs actual.
HMMMMM yardley, I take it you are apeaking of desktop dyno 2000? If not, what is it and do you like it? Would you recomend somthing else? I am int the market for for a dyno program. not shure what i want yet. I need to plug some numbers in for a 455 i'm buiding for my GS. may save some parts purchacing. Have a race demon RS that i'm looking to tune correctly and need to know what rockers to order(ratio). alot of things can change as the heads are not done yet. maybe you could plugg these in? If so thank you. a recomondation of a dyno progam would work too. 455 +.030 TA 510 IN.255*EX265*@.050 110*lobe center IN..576EX.576 W/TA1.6:1 roller rockers sp1 intake Race demon carb variable to 1050 -- any combo headers not purchaced yet (probably TA 2" super competition) '71 heads w/ stage 1 valves (working with ports soon.no#'s yet. and will be milled to proper cc for 10.5:1 compression) 6al MSD will probably get the retard module. Probably not enough information. will have more soon.o No:
Yeah, it's Dyno2000. Not very robust. You are limited with what you can play with. You can't adjust the timing, rocker ratio, chamber cc and others. With the cam degreed at 0*, your #s are 543HP@6500 and 485TQ@5000. Making the similar adjustments to your numbers that I see coming in would put you at 555HP@6500 and 533TQ@5000. Advancing the cam 8* would yield 535HP and 500TQ (adjusted is 545 and 550). If there is better program, I'd like to know what it is too.
