High Compression Pistons, +32hp gain - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

SmackedSilly · 03-05-2003, 06:49 PM

http://cgi.ebay.com/ebaymotors/ws/eB...category=33623

is this bull ****
im guessing it is

*Jeff240sx* · 03-05-2003, 07:05 PM

Beck-Arnaly (sp?) is what Autozone and Discount Autoparts use to remanufacture stuff.
SOHC pistons will bump up the CR to 11.1:1 or so, so these are "custom"?
Anyway, you don't gain 10% per point of CR on our cars. Most people will agree that with SOHC pistons, you'll gain about 5% of your total power, or about 8rwhp on a car with I/H/E. Bull****, no. Think of it as an extension of the truth.
-Jeff

d240t2 · 03-05-2003, 07:05 PM

Yeah...32 crank hp is a little bit optimistic for a 2.1 bump in cr. 10-15whp is more like it.

Dennis

240Stilo · 03-06-2003, 03:10 AM

Isn't the bore of the sohc piston a little bigger than the dohc? Just remembered digging that up somewhere, but hey if people have been using them with no problems then i see no problem.

Zemus · 03-06-2003, 06:57 AM

Yea i was also wondering that, cuz i want to put my current sohc pistons in my new DOHC ka, but i want to know what i need to do

d240t2 · 03-06-2003, 02:59 PM

Bore and stroke of SOHC and DOHC KAs is the same

240Stilo · 03-06-2003, 11:28 PM

Quote:

Originally posted by d240t2
Bore and stroke of SOHC and DOHC KAs is the same

Can you please prove it just to double check, thanks

P.S. I was checking out how the celicas different compressions did for performance and found that the GT-S has a bigger bore, shorter stroke and 11.5: 1 CR. The GT has 10:1 CR, longer stroke, and smaller bore and the difference between the two are 40 horses and 4lb./ft. of torque. Just food for thought.

JNM240 · 03-07-2003, 11:14 AM

Bore is 89mm and stroke is 96mm on both. They use the same crankshaft and same rods. The pistons are interchangeable, but you do not want to put the DOHC pistons into a SOHC as you will greatly lower the CR. The 89 SOHC pistons were a 9.1:1 CR and will make a 11.6:1 CR if installed into a DOHC. The 90 SOHC pistons were 8.6:1 (lowered slightly due to changed emmision laws between 89 and 90, and also to increase driveability) and will make 11.1:1 CR in a DOHC engine. On 93 octane, 11.1:1 would be the most you would really want to run without fearing detonation.

03-05-2003, 06:49 PM	#1
SmackedSilly Join Date: Jan 2003 Location: Toronto, Ont. Posts: 14 Trader Rating: (0) Feedback Score: 0 reviews	High Compression Pistons, +32hp gain http://cgi.ebay.com/ebaymotors/ws/eB...category=33623 is this bull **** im guessing it is

03-05-2003, 07:05 PM	#2
Jeff240sx I hate you too... Join Date: Jul 2001 Location: Tampa, FL Age: 42 Posts: 5,828 Trader Rating: (0) Rides Gallery: Jeff240sx Feedback Score: 0 reviews	Beck-Arnaly (sp?) is what Autozone and Discount Autoparts use to remanufacture stuff. SOHC pistons will bump up the CR to 11.1:1 or so, so these are "custom"? Anyway, you don't gain 10% per point of CR on our cars. Most people will agree that with SOHC pistons, you'll gain about 5% of your total power, or about 8rwhp on a car with I/H/E. Bull****, no. Think of it as an extension of the truth. -Jeff __________________ Whatup?

03-06-2003, 03:10 AM	#4
240Stilo Junkie Join Date: May 2002 Location: Socal Age: 41 Posts: 1,160 Trader Rating: (0) Feedback Score: 0 reviews	Isn't the bore of the sohc piston a little bigger than the dohc? Just remembered digging that up somewhere, but hey if people have been using them with no problems then i see no problem. __________________ -Juan

03-06-2003, 06:57 AM	#5
Zemus Nissanaholic! Join Date: Oct 2001 Location: Minneapols Age: 40 Posts: 2,268 Trader Rating: (0) Rides Gallery: Zemus Feedback Score: 0 reviews	Yea i was also wondering that, cuz i want to put my current sohc pistons in my new DOHC ka, but i want to know what i need to do __________________ \|Ziptied.com\|Hybrid Z\|D-Town Forum\|Clubfr.net\|

03-07-2003, 11:14 AM	#8
JNM240 Join Date: Jan 2003 Location: South Louisiana Posts: 13 Trader Rating: (0) Feedback Score: 0 reviews	Bore is 89mm and stroke is 96mm on both. They use the same crankshaft and same rods. The pistons are interchangeable, but you do not want to put the DOHC pistons into a SOHC as you will greatly lower the CR. The 89 SOHC pistons were a 9.1:1 CR and will make a 11.6:1 CR if installed into a DOHC. The 90 SOHC pistons were 8.6:1 (lowered slightly due to changed emmision laws between 89 and 90, and also to increase driveability) and will make 11.1:1 CR in a DOHC engine. On 93 octane, 11.1:1 would be the most you would really want to run without fearing detonation. __________________ 1990 SOHC KA24E Coupe

03-05-2003, 07:05 PM	#3
d240t2 Zilvia Member Join Date: Mar 2002 Location: Atlanta, GA Age: 44 Posts: 205 Trader Rating: (0) Feedback Score: 0 reviews	Yeah...32 crank hp is a little bit optimistic for a 2.1 bump in cr. 10-15whp is more like it. Dennis

03-06-2003, 02:59 PM	#6
d240t2 Zilvia Member Join Date: Mar 2002 Location: Atlanta, GA Age: 44 Posts: 205 Trader Rating: (0) Feedback Score: 0 reviews	Bore and stroke of SOHC and DOHC KAs is the same

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode