Phil99vette

iTrader: (11)

Which one is more important in the final power output of a turbocharged application? If you could go with only one or the other which one would you choose?
1)
Stroker with mild heads

2)
Standard stroke with the best heads on the market.

bboyferal

iTrader: (9)

Good question. I would like to hear many answers on this.

It's obvious that stroker + the best heads would be nice, but to what degree and in what way would one change have impact compared to the other?

cablebandit

iTrader: (37)

i would guess neither is BEST...just kinda equal....pick your poison

Project GatTagO

iTrader: (7)

Bore has a significant impact on power. If I had a bunch of money I would be building a 4" bore 3" stroke 302ci LS2 block engine with L92 heads. Rev it to 8000RPM.

Andrew

DrTurbo

iTrader: (3)

Will depend on the turbo........to many variables left unanswered.

bboyferal

iTrader: (9)

That's the way I'd like to look at it, too... Without giving into crazy scrutiny. Seems like a safe approach to me.

DrTurbo

iTrader: (3)

Yep...that would be very cool.

509TURBOFIREHAWK

The way i look at it is, Big bore, you are going to get the maximum out of a given set of heads. as the valve shrouding will be much less than with a smaller bore. All of your top level motorsports use the largest bore they can and then use whatever stroke they need to get to the cubic inch limit allowed by rules. Ex. NHRA Pro Stock 4.680" bore and around 3.62" stroke. NASCAR 4.190" bore and 3.25" stroke. And IHRA Pro Stock uses bores up to 4.800". So I quess these types of teams put more value in bore. But, you cant beat Bore and Stroke. So me Personally, I would use the largest bore possiible then choose crank stroke to determine cubic inch and what the final Comp ratio will be, so it will be low enough to be able to be turbocharged.
To give you an idea of what im talking about, Im building a TT500+ inch BBC, with less stroke Than what you guys use in a 402 LS1.

Got Me SOM

iTrader: (2)

short stroke and a solid roller and spin it to win!

2000 Tran Zam

iTrader: (2)

if your gonna use the turbo to make power, the path of least resistance I would think would be your heads...

From what I understand, you can make similar power with different CI motors, but the area under the curve is different.

Id say stick with smaller bore, put on some bad *** heads and max that turbo out.

Phil99vette

iTrader: (11)

Good thing is if I use the stock crank I can spend the extra grand for the stroker crank on a good set of ET heads with a nice thick deck.
Phil

engineermike

Yep, there's only about a MILLION other things to consider.

Turbo selection
Intended use
Intended boost level / fuel

...just to name a few.

Mike

Ping King

iTrader: (20)

youd also have to look at the maps of the turbo...take into consideration if the turbo is going to be able to efficiently move the amount of air for the displacement increase.

427

iTrader: (3)

The whole package must work, but if I had to answer it would be better heads everytime.

Kurt

2000 Tran Zam

iTrader: (2)

Haha, thats what I figured...

And whats up with this smily? I like it

turbo'd stang

I too would say it is the whole combo. When you look at some of the record setter's combos, nothing stands out. Wolfes motor was a 4.030 bore, 3.75 stroke with some TW R heads that flowed around 330. None of that is special...just a good cam, converter and tune is what really matters IMO. Job Jr ran high 7's with heads that barely flowed over 300....it was the combo.

F8LWS6

iTrader: (11)

I would say better heads. I'm always reading how these relativly small motor Mustangs (Mid 300 and lower cubes) are having no problem going into the 8's and 7's. That tells me its in the rest of the combo thats making it work. Look at Kempfs Camaro. Bottom 8's on a 370 cube iron block and no trouble spooling a 101. Not bad if you ask me!

engineermike

That's where the goals, gas, and turbo selection come in.

It's pretty well known, that for max absolute power, some turbo's do better on smaller cid but with more boost. So, the 331 cid mustangs running T-76 turbo's have an advantage, but keep in mind they're running 25+ psi boost and race gas.

F8LWS6

iTrader: (11)

Err.....Well I meant more along the lines of this :

http://www.candcmotorsport.com/index.html

331 with 96 MM turbo making well over 1200 horse running 7.71@188mph on drag radials.

pwrtrip75

iTrader: (8)

If you have a stocker and a stroker pumping the same air through them, (smaller cubes would need a little more boost to acheive the same airflow as larger cubes) I would assume the stocker would be better. A de-stroker I think would be better than a stroker in boost applications, less rotating mass and I dont think you really need a stroker for torque in a boost app either. Max bore would be best and minimum stroke.
Just my opinion.