better boost

[240kep]

ok every one here seems to get pissed at me for asking qustions but oh well im new to the import scene and i just got my 240sx like 4 months ago so if you could answer this id be grateful but if not wtf ever. i need to know whats better for alot of boost a dual over head cam or a single

[s14unimog]

i need to know whats better for alot of boost a dual over head cam or a single

this is a ridiculous question, b/c there are so many other things to consider, but I'll bite. Define: "A lot of boost"

The quick and dirty answer would be DOHC b/c you likely would have more "space" to allow air in and out, but one must consider cam duration, valve size, head flow characteristics, etc...

Asking a arbitrary question like this just announces to the forum that you have no idea what you're even asking. This must be a bet you have with someone, b/c I couldn't imagine how this single bit of knowledge would help you decide something...

[240kep]

ok alot of boost i mean like 25 or 30 pounds of boost what could handle that the best and produce the most horse power with the right air to fuel ratio and tuned right that help

[Ghost240]

The reason you get flamed is because you should look up other KA-T build threads that are single and dual then from there decide and ask for more help.

[TUnity2]

ok alot of boost i mean like 25 or 30 pounds of boost what could handle that the best and produce the most horse power with the right air to fuel ratio and tuned right that help
what?????????

There is more aftermarket support for a DOHC KA, so just go with that. Or don't. I don't care.

[s14unimog]

see this is another great example of how you have no idea what you're even talking about. To say "alot of boost i mean like 25 or 30 pounds of boost" wouldn't necessarily mean "a lot of boost." The concern with head flow, which is your question here, would more accurately answered with concern for CFM restriction. Pressure means nothing without a measurement of volume

[usdm180sx]

ok every one here seems to get pissed at me for asking qustions but oh well im new to the import scene and i just got my 240sx like 4 months ago so if you could answer this id be grateful but if not wtf ever. i need to know whats better for alot of boost a dual over head cam or a single

You need VTEC and NOS

[XnTroubleX]

You need VTEC and NOS
I spit up my soda when I read this!!

[jspaeth]

You need VTEC and NOS

hahaha :hahano: msglngth

[repda916]

The bottom ends are functionally identical with the same Bore × Stroke: 89.0 × 96.0 mm.

The key difference is in the heads.

DOHC vs SOHCThe DOHC head will have greater potential for airflow and when it comes down to it is how much air you can move with the greatest efficiency that makes the most power
Timing ChainThe DOHC dual timing chain assembly is more durable and a better design than the SHOC
Valve TrainSOHC uses rocker arms with hydraulic adjusters and the DE uses cam on bucket design just like the RB, CA, and VQ. It will be more money to build a SOHC valvetrain since each rocker arm will need to be prepped, solid lifters bought, and routinely adjusted. DOHC can use large cams (Brian Crower offers 272° duration at .401" lift for their race cam) with some minor clearancing of the valve bucket area. The DHOC has less valvetrain inertia and potential for higher RPM and only needs springs, retainers, valves, and adjustment shims with cams and your done. The DE valvetrain is much more serviceable and less expensive to build and therefore a lot better option for a street build on a budget


Factory Power Ratings:

DE
# Max power: 155 hp (112 kW) @ 5600 rpm
# Max torque: 160 ft•lbf (217 N•m) @ 4400 rpm

E
# Max power: 140 hp (105 kW) @ 5600 rpm
# Max torque: 152 ft•lbf (206 Nm) @ 4400 rpm

With enough head work, bottom end upgrades, race gas, etc., either one will make comparable power but I betting the DE will have better top end due to its 16 valve head and better port design.

What will never happen is obtaining reliable RPM's above 8K. The fully built Rebello racing KA24E's top out at 8000 RPM's due to the KA's long stroke. A 2.2 or 2L L series crank custom machined to work with the KA or an offset ground de-stroked KA crank would be required to increase RPM's above that but the loss in torque would not be worth it for a street engine.

For a real world example of what the DE can put out check PDM's build of a NA DE - PDM Racing - STS N/A 240SX Pink Princess (http://pdm-racing.com/features/court240.html)

[isixphill]

not to to thread jack but i have alwase wondered if you could get BETTER boost?
like say cleaner air or something.. im not just talking about a fat air filter or something.. idk just alwase wondered

[undesiredshoe]

Sohcs fo lyfe.

[S10Freek]

Hahah Maybe bro you should figure out what ur talking about before you ask for help. go back to grade school n get a better education , learn how to write and then come ask for help. Until then do not expect any respect.