0EG@EnglandGreen

And the power keeps rolling... 1044 Horsepower at the engine!

Matt's 2003 Corvette Z06 with A&A YSi blower, Methanol injection and EnglandGreen Typhoon cam.

888rwhp 740rwtq

95vettski

Nice job!

Can you share more details about the combo? What size pulleys and what heads?

0EG@EnglandGreen

Sure.

LS2 block, Darton MID sleeves bored to 434ci, Diamond pistons, Callies Dragonslayer crank Callies rods, ARP main studs, remediated LS7 heads, Cometic head gaskets, 1/2 inch ARP head studs, FAST 102mm intake, 90mm LS2 TB, EG custom 1500hp fuel system, Alky Control dual nozzle methanol injection system (trunk mounted tank), A&A Vortech YSi 8 rib system (3.125 in pulley), Innovators West 10% overdrive crank balancer, Flipdrive, Kooks headers, RPS Twin Lite clutch, EG custom oil cooler, Dewitts radiator.

We could have run the 2.85 inch pulley or smaller but this was not a max effort build. Happy with almost 900 at the wheels with only 13.5 pounds of boost.

Stephen

Steve@C56

Love thoses numbers...

6700rpm should be the max for this 4.155"bore 4"stroke (equal 7400rpm on a stock cube LS1 for the piston speed)

2.85" will be the max rpm fr the Ysi, so it's 10% margin with 3.125

(theory calc only Inside)
1044fwhp with 13.63psi/434ci is like 451HP on a NA LS2 stock cube

With the 102, LS7 head, headers, it's easy even with stock cam, but power band rpm will fall down (because comming from 362 tu 434ci)

What cam / CR / timing ? (in not secret )

0EG@EnglandGreen

Englandgreen Typhoon cam, 10.0:1 CR, 16 degrees of timing.

c5mtl

Nice combo!

What is the formula u use? What do u think a similar ysi combo but 4.030 bore and 4 inch stroke should have for max piston speed?
6400-6500?

Steve@C56

mid 250s... GREAT !

Just tkinking about mine, close ro 240s / 640 lift, the bigest special spec for my old 346ls1 10psi 10.1 stock 853... that i use now on my stroker 18psi 11.1 300cfm self hand prep 853
I should change for bigger ;-)

Steve@C56

lol
never mind the bore or the psi
if you have the same stroke, it's the same piston speed
6700rpm 4"stroke equal 7400rpm of stock LS1 stroke...

When i was drag racing my old combo (stock ls1 / v3si 3.4 pulley / large cam / 2" header), i was pushing the limit at 7400rpm
22.7m/s for the piston
It's... HIGH
(but i love to be border line... or a little more lol)
Now, for tune the car since i'm 4inch, i have hit a few time 7000, but at future drag race, it will be clever to stop at 6700

Steve@C56

22.7 is the average speed, not the max speed
I can give you the formula for max speed, and/or explain you, but you will be afraid lol

(Edit since i have time to write now)
In fact, i can give you two formula... the first is realy simple but just good an (very goood) approx
the second is... not so simple lol

The first :
S = Stroke (in inch)
L = Rod lenght (in inch)
R = Rpm (in... rpm lol)
Translate S from diameter in inch to radius in meter
Sm = S X 2.54 / 100 / 2
Translate L in inch to meter too
Lm = L X 2.54 / 100
Translate R from rpm to speed in radius/s
Rs = R x 2 x Pi / 60
And do :
(Sm x Rs / Lm) x Square root (Sm˛ + Lm˛)

So, for a stock LS1 who is super safe
S = 3.62
L = 6.098
R = 6200
Vmax = 31.13629235

My pushing LS1 to the limit (7400 rpm on stock piston/rod/rod bolt/crank)
S = 3.62
L = 6.098
R = 7400
Vmax = 37.16267152

for your application :
S = 4
L = 6.125
R = 6700
Vmax = 37.49440475, so, a little more than my 7400rmp on my LS1
6640rmp will be 37.15863396

So... why "my" 7400 limit on LS1 ?
25m/s of average max piston speed admit, So, 8156.784269 rpm on stock LS1 stroke
Stock ECU is limited to 8000rpm in a lots of internal table
LS1/LS6 rod bolts are known to stretch and fail at 7000
Stock LS6 was tested at 6900 rpm for 100 hours
So, between 6900 (safe for the LS6) ans 8150 rpm, 7525 can be hit when changing gear (i m MN6), so, i put 7400

Is there a known LS that hit 37m/s ?
The Nascar LS2 is 41.78m/s at 8600rpm
Some Nascar LS2 hit 44.2m/s at 8800rpm
The biggest NA version of race car 2015 Copo Camaro is 44.8m/s at 8000rpm (recommended limit by GM)
So, no FI version at this point

What about FI version ?
The FI version of 2015 Copo Camaro only hit 37m/s at 8000rpm (again recommended limit by GM)
So, better to stay close to 37 ;-)

The second formula :
Note that the delta is less than 0.5% on LS bore/stroke
If needed, i can give you, but there is 3 "cos", 3 "arccos", 3 square root, 3"pi", 4 "˛", and 19 fractions

c5mtl

Wow...thx for that...maybe I should have asked what thx rough max rpm I should be shooting for assuming my parts are good

Steve@C56

Best to see your cam power range for the CI you have

FYI: Constraint (in classical mechanics ) is depending about the square of the piston speed

So...
Engine.................................. ........ Max piston speed... Constraint factor
Strock LS1 ŕ stock limiter (6200)..... 31,13629235........ 969,4687013
Your engine ŕ 6700........................ 37,49440475........ 1405,830388
The 427 NA Copo Camaro at 8000... 44,8..................... 2007,04

Even the 2007 Formula One Renault R27 750hp NA 145ci V8 engine with 1,56" stroke / 19,000rpm sould be Under 43 (max piston speed), cannot calc because rod lenght is secret (i choose the 07 because 06 rules do for the first time the F1 engine "almost" reliable)