Dyno Sim

[Loves302Chevy]

I hate to say it, but after reading this, now I'm really confused.

Edit: Grumpy clarified in his above post as I was writing this.

 

[Lmus10]

Thanks again for all the info.

 

[Grumpy]

heres your typical cam spec card this one happens to be the crane cam I selected for my corvette

heres the spec card from the t-buckets 406 sbc

if you were to graph in the lash slack the valve lift would start a degree or so later and end a degree or so earlier,
but the total lift would remain constant as the distance the lifter travel in the blocks lifter bore as the cam lobe rotates under it,
from the base circle to the peak lift remains consistent

 

[Indycars]

Bet you thought I forgot.... just finding time now is a challenge.

I kept the same lash for both Crane camshafts 110921 and 110981.




I really like how I did this graphic for DynoSim5, overlaying one on top of the over. By far
better than two separate graphs.



I also ran the numbers for the compression ratios. The difference in HP/Torque would be even greater
if the Crane 110981 had the same DCR as the 110921.



So that you don't have to flip back-and-forth between this page 2 and page 1 to see the cam card
on this post, I reposted the cam cards used in the graph above.




.

 

[Grumpy]

excellent and very helpful post!
THANK YOU!
and BTW ideally those cams run best with race octane gas,
(big surprise) and building the engine so your getting the static compression up closer too the 11.5:1-12:1 static compression range,
and the 10:1 dynamic compression range and gearing the car,
so it runs almost exclusively in the 4000-rpm-7000-rpm power band


http://garage.grumpysperformance.com/index.php?threads/porting-can-help.462/page-3#post-67187

http://garage.grumpysperformance.co...gine-to-match-the-cam-specs.11764/#post-55651

http://garage.grumpysperformance.co...trans-choice-made-correctly.11697/#post-54816

http://garage.grumpysperformance.co...ing-parts-and-a-logical-plan.7722/#post-68651

http://garage.grumpysperformance.co...train-clearances-and-problems.528/#post-57678

http://garage.grumpysperformance.co...compression-torque-dcr.1070/page-2#post-52809

http://garage.grumpysperformance.co...-calculators-and-basic-math.10705/#post-50173

http://garage.grumpysperformance.co...olishing-combustion-chambers.2630/#post-48319

http://garage.grumpysperformance.com/index.php?threads/port-speeds-and-area.333/#post-37705

 

[Indycars]

It really makes a difference to maximize the CR to make a radical camshaft perform.

 

[Lmus10]

Yes. All good information. Thanks to all who contributed.

 

[Grumpy]

please let us know the parts list and machine work you have done,
and the eventual results you get and your driving impressions.
once the cars engine is installed and tuned and tested out.
you'll have much better results if you don,t randomly select parts,
and keep in mind a trusted machine shop, and listening too advice from an experienced machinist,
can help prevent you from a great many mistakes ,Try to find some friendly, knowledgeable older geezer,
with 30-45 plus years of experience building race engines
and if your going too build an engine for bracket racing,
you,ll want to get the static compression up to about 11.5:1-12.5:1 ( MINIMUM,)

and use race octane fuel, (do the required calculations) not crappy pump gas.
youll want to build the lightest weight car you can, because weight,
or increased mass takes more energy (hp) to accelerate,
building an engine to maximize torque over the intended rpm range,
and gearing the car too match that, and tuning the tires and suspension to use that available torque is key,
as it tends to maximize your cars potential.

https://vpracingfuels.com/product/sv05/

http://garage.grumpysperformance.com/index.php?threads/octane-boosters.613/#post-1379

http://garage.grumpysperformance.co...temps-detonation-resistance.12842/#post-66647

http://garage.grumpysperformance.co...octane-for-compression-ratio.2718/#post-35581

http://garage.grumpysperformance.com/index.php?threads/detonation-pre-ignition.208/#post-487

http://garage.grumpysperformance.com/index.php?threads/detonation-damage.2883/#post-31942

http://garage.grumpysperformance.com/index.php?threads/toluene-octane-calculator.11278/