Why doesnt the V8 SHO engine have true secondaries?

[revhardSHO]

I know it does have "secondaries" but they are just a blocked off portion of the main runner right? Why didnt they stick to a true dual runner system with 2 induvidual runners per cyl? They did it with the CSVT, all the more reason to do it on the SHO. How do the secondaries of a v8 compare to a v6? Is there a power increase like that of the v6? (it sounds meaner too). Why didnt ford and yamaha do a true setup? shrug

 

[TitoElSpicco]

from looking at the v6, my guess is it just wouldn't fit under the newly-designed hood.

 

[wild01ride]

smithsil:
I know it does have "secondaries" but they are just a blocked off portion of the main runner right? Why didnt they stick to a true dual runner system with 2 induvidual runners per cyl? They did it with the CSVT, all the more reason to do it on the SHO. How do the secondaries of a v8 compare to a v6? Is there a power increase like that of the v6? (it sounds meaner too). Why didnt ford and yamaha do a true setup? shrug

The secondary system in the SHO is just as "real" as the system used in the Duratec engine. The difference is merely in the approach used to tune the intake system. The actuation of the secondaries increases the effective intake area and subsequently the overall flow rate while utilizing the single set of intake runners. In the end, the effect is the same as with the Duratec. Probably the biggest reason that the two engines have dissimilar intake manifold configurations is because the Duratec uses a much smaller throttle body than the 3.4L. Because of the small throttle body on the 2.5L, the engine can appreciate being fed through one set of intake runners whereas on the 3.4L, too much vacuum would accumulate in the intake system if the intake was choked into a single set of intake runners at low throttle settings with such a large throttle plate feeding the system.
Overall, the Duratec probably sees better torque numbers at low to moderate engine speeds because of the smaller runner/smaller throttle body configuration while the 3.4L will achieve better power-generating capability at moderate to high engine speeds with the single runner.

 

[TitoElSpicco]

i think he was asking why it doesn't have 16 runners like how the v6sho has 12.

our setup is very similar to a duratec setup from what i can make out.

 

[wild01ride]

TitoElSpicco:
i think he was asking why it doesn't have 16 runners like how the v6sho has 12

I understand. The intakes of both cars are tuned with the same strategy but they are carried out differently.
The V6 uses unequal-length runners- one long runner per cylinder for low engine speed operation and one short runner per cylinder for high engine speed operation. The V8 uses the same principles of intake tuning, but instead of varying the runner length, the effective cross-sectional intake area is increased for high engine speeds.
Hope that helps.

 

[revhardSHO]

do you guys feel a similar power gain with the v8 SHO? when do your secondaries open up?

 

[wild01ride]

3400 RPM.
Power gain is impressive but mostly, the sensation along with the sound is what makes the whole package exhilarating!

 

[TitoElSpicco]

smithsil:
do you guys feel a similar power gain with the v8 SHO? when do your secondaries open up?

a similar power gain, but the gen1/2's always sound meaner from what i've heard.

 

[99V8SHO]

Ah, but wait until you open up that intake! After I got home from the TSHOC meet I ripped out the tube that goes into the fender (I know I am sucking hot air right now, I don't wanna hear it) so all that is left is the air box. When 3400 RPMs comes along, you know it! It really sounds mean. Similar to that of the V6. On average the V6 secondaries are louder, but the V8 secondaries sound mean. And apparently after you get the cone on there they are even more pronounced. I can't wait to do that. thumb

 

[SHOZ123]

Check this out.

PreProduction V8

 

[wild01ride]

Whoa! eek!

What/where on earth is that?!

 

[cartfan76]

Seems to be a problem with superford.org or something. Neither that pic or Carter's sig picture won't show up...?? Sorry for the OT..just thought I'd bring it to your attention.

 

[ArkanSHO]

Yeah, I noticed that, right when they started to commence the 2 day voting for the COTM they went and lost them. BTW, I saw that engine in person last year. Has a slightly different block but it still exist.

<small>[ November 17, 2003, 07:19 AM: Message edited by: ArkanSHO ]</small>

 

[SHOtype]

Sweet. I would give my left, right, and middle leg for that intake.

 

[cartfan76]

IIRC from the scanned article that the pic was from, that pre-production engine actually made less peak horsepower...might have been some PCM tuning involved in that. As far as the drivability of the engine, I'd be curious to see what that would do to the lack-luster bottom-end this engine has when mated to the AX4N and a 3,600lbs car... I'm not too conserned about top-end power, as when my bank acct will support it...can someone say "BBB"? thumb

 

[XLSuruaT]

I have the article with that picture. Just let me know and I can post the rest.

 

[Chris Benvie]

The V8 SHO at WOT with a cone filter or CAI is quite a sound to be reckoned with. I am quite impressed with it everytime I drive one. If only i could press a clutch in one and shift it, I would buy one

 

[Funmart6]

Porterize your intake and you will be pleasantly surprised! thumb