Hey Dan I am right down the street!

Yeah I can put the #'s in and see what comes up for you.

 

XS274S 110 / 106 cam profile - rough estimate is
TQ 466 @ 4000
HP 441 @ 5500

XS282S 110 / 106 cam profile - rough estimate is
TQ 458 @ 4500
HP 449 @ 6000

Both look strong. What are you running it in?

 

Im building the same motor exept cca-12-773-8 xr280r roller 242-248 570-576 110 if you get a chance could you put in that cam. Thanks

 

Cool, A neighbor. Sold a 70 malibu in 94 (yellow with black/green SS stripes). Getting the fever to start a new project with an Iroc that was a gift. Currently, I'm putting together a combo for approx 500# tq/ 500 hp na. Want to race it at cooper river and dorchester drag. Even though those are impressive numbers, I'm kinda dissapointed. What is causing is it to lay down? I havn't purchased the intake. Would a Vic jr. or super Vic help. Don't want to spin it over 6500 though. I know a roller cam would help but would rather do this with a solid, if possible.


Donor Vehicle(as in GIVEN to me):
1985 IROC Z-28 w/o engine or trans(will build-up a PERFORMANCE 200r4)
Converter will be based on engine output(2-4k stall)
3.73 rear axle ratio
Approx weight b-4 dieting 3500#
Hot street/Bracket racing
NOT a daily driver but a weekend bruiser

 

With the XS274:

RPM···········2000····2500····3000····3500····4000····4500····5000····5500····6000····6500
Brake_Tq······218·····305·····377·····403·····435·····446·····438·····416·····372·····329
Brake_HP······83.2····145·····215·····269·····331·····382·····417·····435·····425·····407
Exh_Pres······0.0·····.1······.2······.3······.4······.5······.7······.8······.9······1.0
Int_Vacuum····.1······.1······.2······.4······.6······.8······1.0·····1.1·····1.2·····1.4
Vol_Eff_%·····58.9····71.4····82.5····87.0····93.7····97.5····98.5····97.7····94.0····91.9
Actual_CFM····140·····213·····295·····363·····447·····524·····589·····641·····672·····712
Fuel_Flow·····51.3····77.8····108·····133·····163·····192·····215·····234·····246·····260
A/F_Mix_Qal···91.2····98.7····100.0···100.0···100.0···100.0···100.0···100.0···100.0···100.0
BSFC··········.617····.536····.500····.494····.493····.501····.516····.538····.578····.639
BSAC··········7.740···6.718···6.276···6.192···6.182···6.286···6.472···6.749···7.253···8.017
Friction_HP···20······30······42······56······72······93······117·····143·····173·····222
Mach_#········.143····.179····.214····.250····.286····.322····.357····.393····.429····.465
Piston_Spd····1250····1563····1875····2188····2500····2813····3125····3438····3750····4063
Piston_Gs·····283·····442·····637·····867·····1133····1433····1770····2141····2548····2991
Overlap_%VE···-4.0····-3.0····1.1·····-.2·····2.0·····2.8·····2.6·····2.1·····-.5·····-.8
Int_AvgVel····110·····137·····165·····192·····219·····247·····274·····302·····329·····357
In_InertiaPrs·.1······.6······1.2·····1.8·····2.4·····2.7·····2.9·····2.8·····2.7·····2.4
In_ResTunPrs··0.0·····0.0·····0.0·····0.0·····0.0·····0.0·····0.0·····0.0·····0.0·····0.0
Ex_AvgVel·····124·····155·····186·····217·····249·····280·····311·····342·····373·····404
ExTun_Prs·····.7······.6······-.3·····-.4·····-.8·····-1.4····-1.7····-1.7····-1.3····-1.2
Valve_Toss····None····None····None····None····None····None····None····None····None····None
Spark_Adv·····29······31······26······28······28······30······33······34······35······36

11.43 @ 115.89 in your 3500# car.

With the XS282s:

RPM···········2000····2500····3000····3500····4000····4500····5000····5500····6000····6500
Brake_Tq······153·····242·····367·····416·····431·····448·····442·····422·····379·····336
Brake_HP······58.2····115·····209·····277·····328·····384·····421·····442·····433·····416
Exh_Pres······0.0·····.1······.2······.3······.4······.5······.7······.8······.9······1.0
Int_Vacuum····0.0·····.1······.2······.4······.5······.8······1.0·····1.2·····1.3·····1.4
Vol_Eff_%·····48.9····62.7····81.1····89.1····92.9····97.5····99.0····98.6····95.0····92.9
Actual_CFM····117·····187·····291·····373·····443·····525·····592·····647·····679·····719
Fuel_Flow·····42.6····68.2····106·····136·····162·····192·····216·····236·····248·····263
A/F_Mix_Qal···90.0····97.8····100.0···100.0···100.0···100.0···100.0···100.0···100.0···100.0
BSFC··········.731····.592····.507····.492····.493····.500····.514····.535····.573····.632
BSAC··········9.172···7.432···6.362···6.170···6.186···6.274···6.445···6.705···7.189···7.925
Friction_HP···20······30······42······56······72······92······116·····142·····172·····220
Mach_#········.139····.173····.208····.243····.277····.312····.347····.381····.416····.451
Piston_Spd····1250····1563····1875····2188····2500····2813····3125····3438····3750····4063
Piston_Gs·····283·····442·····637·····867·····1133····1433····1770····2141····2548····2991
Overlap_%VE···-5.4····-4.0····2.4·····3.2·····2.1·····3.2·····3.0·····2.2·····-.8·····-1.2
Int_AvgVel····110·····137·····165·····192·····219·····247·····274·····302·····329·····357
In_InertiaPrs·0.0·····.4······1.1·····1.8·····2.5·····2.9·····3.1·····3.1·····3.0·····2.7
In_ResTunPrs··0.0·····0.0·····0.0·····0.0·····0.0·····0.0·····0.0·····0.0·····0.0·····0.0
Ex_AvgVel·····124·····155·····186·····217·····249·····280·····311·····342·····373·····404
ExTun_Prs·····.7······.5······-.4·····-.7·····-.8·····-1.4····-1.6····-1.6····-1.3····-1.2
Valve_Toss····None····None····None····None····None····None····None····None····None····None
Spark_Adv·····31······32······28······26······28······30······33······34······35······36

11.40 @ 116.34 in your 3500# car.


With the xr280r

RPM···········2000····2500····3000····3500····4000····4500····5000····5500····6000····6500
Brake_Tq······195·····290·····378·····418·····437·····454·····450·····430·····386·····344
Brake_HP······74.2····138·····216·····278·····333·····389·····429·····450·····441·····425
Exh_Pres······0.0·····.1······.2······.3······.4······.6······.7······.8······.9······1.0
Int_Vacuum····0.0·····.1······.2······.4······.6······.8······1.0·····1.2·····1.3·····1.5
Vol_Eff_%·····55.9····69.8····83.3····89.9····94.3····99.1····100.8···100.2···96.5····94.3
Actual_CFM····133·····208·····298·····376·····450·····533·····602·····657·····690·····731
Fuel_Flow·····48.7····76.0····109·····137·····164·····195·····220·····240·····252·····267
A/F_Mix_Qal···89.6····98.5····100.0···100.0···100.0···100.0···100.0···100.0···100.0···100.0
BSFC··········.656····.551····.505····.494····.494····.501····.513····.534····.571····.628
BSAC··········8.233···6.907···6.330···6.192···6.198···6.282···6.438···6.696···7.165···7.878
Friction_HP···21······31······43······57······73······93······117·····143·····173·····221
Mach_#········.133····.167····.200····.233····.266····.300····.333····.366····.400····.433
Piston_Spd····1250····1563····1875····2188····2500····2813····3125····3438····3750····4063
Piston_Gs·····283·····442·····637·····867·····1133····1433····1770····2141····2548····2991
Overlap_%VE···-4.8····-3.5····2.1·····2.6·····2.1·····2.9·····2.7·····1.9·····-.8·····-1.1
Int_AvgVel····110·····137·····165·····192·····219·····247·····274·····302·····329·····357
In_InertiaPrs·.1······.6······1.3·····2.0·····2.7·····3.2·····3.4·····3.4·····3.2·····2.9
In_ResTunPrs··0.0·····0.0·····0.0·····0.0·····0.0·····0.0·····0.0·····0.0·····0.0·····0.0
Ex_AvgVel·····124·····155·····186·····217·····249·····280·····311·····342·····373·····404
ExTun_Prs·····.7······.5······-.4·····-.7·····-.8·····-1.4····-1.6····-1.6····-1.3····-1.2
Valve_Toss····None····None····None····None····None····None····None····None····None····None
Spark_Adv·····30······31······26······26······28······29······33······34······36······37

11.34 @ 117.07 in the same car.

 

Onovakind67,
What program are you using for the dyno sim?
I have an earlier copy of Dyno2000. The hardest part has been getting the Head Airflow data in the right parameters. When you enter the known head flow data, what did you list at the inlet flow pressure drop? I think you are dead on with the numbers. With the solids, he could try running a split lash to improve the top end.

 

Performer RPM Air Gap,,,40Coupe just swapped an air gap for his vic Jr. and ran a new best,picking up a tenth in e.t. He's running a pump gas 383 in you guessed it a "40 Coupe"

 

Swapping from a single to dual plane requires rejetting/recalibrating the carb.

 

Originally posted by GRN69CHV:
Onovakind67,
What program are you using for the dyno sim?
I have an earlier copy of Dyno2000. The hardest part has been getting the Head Airflow data in the right parameters. When you enter the known head flow data, what did you list at the inlet flow pressure drop? I think you are dead on with the numbers. With the solids, he could try running a split lash to improve the top end.

It's EA3.0. I have the heads in a data file, and just select them. You can create heads if you like. I have a set of 'Joe Sherman' heads, made from the flow figures given by Joe from the 600hp Enginemasters motor.
One of the criticisms EA3.0 has of these three charts is the 80% i/e ratio of the AFR heads when used with a split cam. One of the suggestions is to reduce the exhaust duration and rocker ratio.
One difficulty in setting up an engine for an EA3.0 dyno run is the wide variety of components you can choose. Most guys get real technical with the cam data and head flow, but a lot of the rest gets glossed over. Exhaust system design, piston type, ring type, oiling system, bearings, valvetrain, machining practices, etc.

 

wow I would have thought a solid roller would have come up better than that having looked at dyno tests they usually come up around 500 hp in siliar combos. How much compression do you think I can get away with in this motor? Any Ideas on a better solid roller cam for a 4000 lb truck?

 

We can probably get a better estimate of projected power if all the details of the engine are revealed, including anything that will affect the outcome. I can modify all kinds of variables to get well in excess of 550 hp, but if you don't actually have these parts in your engine the dyno test is worth nothing. Then there are the tuning variables, like carb jetting, air bleeds, spacers and timing, which don't appear in the test.

 

Evaluating those numbers again. I can get much better tq ( >400 @ 2800) and equitable hp using a set of vortec heads and a much smaller cam 218/224@ .50 and .462/.469 lift comp hr. (Per 1-04 Super Chevy "Cloning Experiment")What am I missing? My combo just doesn't add up! Want to try a different cam for comparison's sake? Please use this: CC Magnum 294S (12-224-4) 248/248 .525/.525 and a Vic Jr. Goal is 500/500 tq/hp

For example: car craft made 540hp/517tq using afr 195's and a cc 294s w/vic jr. (tq was over 420# from 3000-6600)

BTW, all of these components are flexable at this point. All I have is a complete 165 hp 350 engine w/4 bolt mains from a 76 suburban. It needs everything

 

Dan you just need a couple more cubes.

I am thinking something on a 4.25 bore with a 4.00 stroke should get you there real easy.

If you want to play w/ some #'s shoot me an email and we can chat on the phone so I can plug some #'s in for you.

 

You dont really believe magazine dynos do you?????

they have to sell the parts they use

 

Originally posted by bigjimzlll:
You dont really believe magazine dynos do you?????

they have to sell the parts they use

 

Well, I understand advertising and promotion and I believe the results are accurate within 5-10 %.(calibration errors between dynos). I also DONT believe they would outright lie in the articles regardless of whose parts they use. Due to budget constraints, I'm sure they use whatever parts are being given to them at the time. Credibility is the lifeblood of a magazine and if you dont have it, its doomed for failure. Chevy High Performance and Car Craft are respected within the industry and I DONT believe they would cook the numbers for the sake of an article. I do believe, however, that an unfavorable article might find itself on the editors floor if poor results were obtained from a primary sponsor.

 

Originally posted by newonad:
Evaluating those numbers again. I can get much better tq ( >400 @ 2800) and equitable hp using a set of vortec heads and a much smaller cam 218/224@ .50 and .462/.469 lift comp hr. (Per 1-04 Super Chevy "Cloning Experiment")What am I missing? My combo just doesn't add up! Want to try a different cam for comparison's sake? Please use this: CC Magnum 294S (12-224-4) 248/248 .525/.525 and a Vic Jr. Goal is 500/500 tq/hp

For example: car craft made 540hp/517tq using afr 195's and a cc 294s w/vic jr. (tq was over 420# from 3000-6600)

BTW, all of these components are flexable at this point. All I have is a complete 165 hp 350 engine w/4 bolt mains from a 76 suburban. It needs everything

What you are missing are details. 'Forged pistons' can range from the very heavy but durable TRW's with big rings to the lightweight custom made ones with low drag rings. AFR 210's come in a couple of configurations. 'Steel rods' can mean GM or Oliver. What accessories do you have on the engine? What is the exact physical configuration of your exhaust system? All of these details make a big difference in the output of your engine.
Note the row in the charts called 'friction hp'. This is the internal friction of the engine. Simply by reducing the friction of the bearings, rings and accessories I can reduce this number by 50 or more. No cam change, same carb, etc but 50 more flywheel hp. Are you doing this in your engine?