highest compression with R4 cam (SOHC) - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

shinrekka · 10-28-2007, 07:57 AM

Even though i havnt owned a 240 in a long ass time, and its gonna be awile till i pay off my new car I still dream of different builds i'd like to do in the future. For my next build i'd like to go all motor SOHC. I know blah blah blah i dont care what you have to say if you think its a bad idea, no i dont want turbo, been there done that.

Alright heres my question, what is the highest compression i can go using a nismo R4 cam. I'd like to run 10:1 but im not sure what the limit is before the pistons hit the valves.

Heres the potential set up
Nismo R4 cam ( possible port + polished head)
rebuilt bottom end, 10:1 compression pistons (maybe overbore?)
obx header, test pipe, 3" apexi N1 (yeh i know its gonna be stupid loud)
custum intake with K+N filter
Fidanza flywheel, UR crank pulley
JWT ecu

Should be good for 170hp I would think?

shinrekka · 11-07-2007, 06:57 AM

No one knows? No one has an R4 cam or done high comp in a SOHC?

aa87 · 11-07-2007, 08:30 AM

My friends done it but only made 128.4 to the wheels. We laugh at him because he could have spent that money on an sr with all he put into the ka. This is without a tune or anything but meh.

KA-T_240 · 11-07-2007, 03:20 PM

custom intake manifold would help. also, if you can fab, or have connections, some sort of a equal lenght header can help. go .40 over you wont have issue with it, built head for higher RPMS. The main way to gain HP is more CI, more RPMs, More air.

My friend had some crazy ass header on his d16, it gained 16.5whp over a ebay header. same dyno same day.

stinky_180 · 11-07-2007, 03:58 PM

you should plan on doing a lot of work to the head, airflow is the weakest link on the KA motor

gripstr · 11-07-2007, 04:21 PM

you'll top out at 150 with that setup imo

turbo that biastch!! single cam boosted is

and oh i forget to add, it will probably cost you the same amount.

shinrekka · 11-07-2007, 04:31 PM

Quote:

Originally Posted by aa87

My friends done it but only made 128.4 to the wheels. We laugh at him because he could have spent that money on an sr with all he put into the ka. This is without a tune or anything but meh.

-I couldnt care less if you laugh at your friend or not, i wasnt asking your opinion. And Im not going turbo again and if I was I wouldnt want an sr, much rather turbo the SOHC.

-The head of course will be port and polished if budget allows. I wont be doing any valvetrain work other then what I need to for the cam.

-As far as tuning is concerned, I have heard jim wolfe tunes conservitivly so i dont think I will be going that route, maybe at first but I just may go with carbs and have them professionaly tuned.

-Im going to document and dyno everything I do with the car. So everyone will know what each modification makes to clear up all the false information out there. I dont plan on breaking 200hp to the wheels but im going to try to get damn near close to the crank.

-Also mach5camaross, I do have a couple connections and can get many things custom fabbed but that may be far down the line. As of now im going to go with whats on the market and what is affordable for those that want to have fun on a budget. Most people cant or dont know were to get custom intake manifolds or headers made. Kooks custom headers is right around the block from me, but most likely i will be going with OBX, i have had good luck with there header on other cars.

decco · 11-07-2007, 04:43 PM

If you can get some custom fab work done, you should make a ram air intake on your bonnet, like how the Ferrari's and some other cars do it. So when you're up to speed, it allows the air to get forced into the intake, acting like light boost.

Off the top of my head the Ferrari Barchetta is one that does ram air.

stinky_180 · 11-07-2007, 04:52 PM

Quote:

Originally Posted by shinrekka

-The head of course will be port and polished if budget allows. I wont be doing any valvetrain work other then what I need to for the cam.

-As far as tuning is concerned, I have heard jim wolfe tunes conservitivly so i dont think I will be going that route, maybe at first but I just may go with carbs and have them professionaly tuned.

you should consider solid lifter conversion from hybridka, they're on special order however. valve float can be pretty bad at constant high RPMs

you can tune the sohc yourself for a lot less than what jwt charges. hybridka.com ECCS-TEC FTW!!!!!

Mrpickles15 · 11-07-2007, 05:01 PM

Here's an idea from our good friends at Wikipedia.
http://en.wikibooks.org/wiki/Nissan_...A24E/ITB's

Happy little write up on a few hundred bucks worth of crazy NA power for the KA24E/DE. As a disclaimer, I just googled this, I didn't write it.

johngriff · 11-07-2007, 05:41 PM

Horrible write up.

Baller write up located here:
http://forums2.freshalloy.com/showthread.php?t=175979

shinrekka · 11-08-2007, 09:47 AM

Hey, do you guys think i should do this in a stanza, 240, or pickup? I have the option for all 3 right now.

10-28-2007, 07:57 AM	#1
shinrekka Zilvia Member Join Date: Oct 2004 Location: Long Island Posts: 251 Trader Rating: (0) Feedback Score: 0 reviews	highest compression with R4 cam (SOHC) Even though i havnt owned a 240 in a long ass time, and its gonna be awile till i pay off my new car I still dream of different builds i'd like to do in the future. For my next build i'd like to go all motor SOHC. I know blah blah blah i dont care what you have to say if you think its a bad idea, no i dont want turbo, been there done that. Alright heres my question, what is the highest compression i can go using a nismo R4 cam. I'd like to run 10:1 but im not sure what the limit is before the pistons hit the valves. Heres the potential set up Nismo R4 cam ( possible port + polished head) rebuilt bottom end, 10:1 compression pistons (maybe overbore?) obx header, test pipe, 3" apexi N1 (yeh i know its gonna be stupid loud) custum intake with K+N filter Fidanza flywheel, UR crank pulley JWT ecu Should be good for 170hp I would think?

11-07-2007, 08:30 AM	#3
aa87 Zilvia FREAK! Join Date: May 2003 Location: Shreveport, LA Age: 37 Posts: 1,116 Trader Rating: (1) Feedback Score: 1 reviews	My friends done it but only made 128.4 to the wheels. We laugh at him because he could have spent that money on an sr with all he put into the ka. This is without a tune or anything but meh. __________________ Hookers and blow.

11-07-2007, 03:20 PM	#4
KA-T_240 Nissanaholic! Join Date: Sep 2005 Location: Moorhead, MN Age: 38 Posts: 1,788 Trader Rating: (0) Feedback Score: 0 reviews	custom intake manifold would help. also, if you can fab, or have connections, some sort of a equal lenght header can help. go .40 over you wont have issue with it, built head for higher RPMS. The main way to gain HP is more CI, more RPMs, More air. My friend had some crazy ass header on his d16, it gained 16.5whp over a ebay header. same dyno same day. __________________

11-07-2007, 03:58 PM	#5
stinky_180 Nissanaholic! Join Date: May 2004 Location: Pale Blue Dot Age: 40 Posts: 2,064 Trader Rating: (26) Feedback Score: 26 reviews	you should plan on doing a lot of work to the head, airflow is the weakest link on the KA motor __________________ SoCal RallyX Coverage and MTB Ride Reports WheelsDirty

11-07-2007, 04:21 PM	#6
gripstr Zilvia Junkie Join Date: Aug 2007 Location: Los Angeles Posts: 546 Trader Rating: (4) Feedback Score: 4 reviews	you'll top out at 150 with that setup imo turbo that biastch!! single cam boosted is and oh i forget to add, it will probably cost you the same amount. __________________

11-07-2007, 06:57 AM	#2
shinrekka Zilvia Member Join Date: Oct 2004 Location: Long Island Posts: 251 Trader Rating: (0) Feedback Score: 0 reviews	No one knows? No one has an R4 cam or done high comp in a SOHC?

11-07-2007, 04:43 PM	#8
decco Join Date: Feb 2007 Location: Richardson Age: 37 Posts: 42 Trader Rating: (1) Feedback Score: 1 reviews	If you can get some custom fab work done, you should make a ram air intake on your bonnet, like how the Ferrari's and some other cars do it. So when you're up to speed, it allows the air to get forced into the intake, acting like light boost. Off the top of my head the Ferrari Barchetta is one that does ram air.

11-07-2007, 05:01 PM	#10
Mrpickles15 Join Date: Sep 2007 Location: MD Age: 35 Posts: 36 Trader Rating: (0) Feedback Score: 0 reviews	Here's an idea from our good friends at Wikipedia. http://en.wikibooks.org/wiki/Nissan_...A24E/ITB's Happy little write up on a few hundred bucks worth of crazy NA power for the KA24E/DE. As a disclaimer, I just googled this, I didn't write it. __________________ White 89 240 coupe and Pearl White 96 SC300. Sig coming soon.

11-07-2007, 05:41 PM	#11
johngriff Post Whore! Join Date: Jun 2004 Location: Long Beach, CA Posts: 4,103 Trader Rating: (4) Rides Gallery: johngriff Feedback Score: 4 reviews	Horrible write up. Baller write up located here: http://forums2.freshalloy.com/showthread.php?t=175979 __________________ [email protected]

11-08-2007, 09:47 AM	#12
shinrekka Zilvia Member Join Date: Oct 2004 Location: Long Island Posts: 251 Trader Rating: (0) Feedback Score: 0 reviews	Hey, do you guys think i should do this in a stanza, 240, or pickup? I have the option for all 3 right now.