SR24DET

[Beemen550]

5 hours left on ebay, comes with a 91 and 98 240sx and a sr24det, whats everyone think about the sr24, would it be worth doin, i know there would be more torque for sure, he says its capable of 700-1000 whp

[Beemen550]

oops heres the link

http://cgi.ebay.com/ebaymotors...%3AIT

[ETTInnov04]

I wouldn't but its your 5k. The guy has 2 feedbacks, is selling two cars and a built block for 5k, no reserve mind you. Who knows it could be that he really is in need of serious money but sounds shakey to me. I would pass.

[Beemen550]

yah i wouldnt buy it either, i was just wondering about a sr24, its just the first time ive heard of someone having one, i would like the extra torque but i have better plans with my money

[virus77]

its seems like its bored out its ******* so torque wouldnt increase too much, stroking the motor increases torque.

[ILikeMy240sx]

buing unfinished proj cars like that is only asking for trouble..

[RMiller]

its seems like its bored out its ******* so torque wouldnt increase too much, stroking the motor increases torque.

That's not really true. A greater stroke will limit max rpm and I think that fact has lead to your misconception.

[PROJECTRB240SX]

A GREATER STROKE DOESN'T LIMIT RPM.... YOUR ROD TO STROKE RATIO LIMITS MAXIMUM RPM. IF YOU CAN INCREASE THE LENGTH OF YOUR ROD WHILE YOU ARE STROKING THE ENGINE YOU WILL RETAIN YOUR REV CAPABILITIES. ROTATIONAL MASS IS ALSO A MAJOR LIMITER OF RPM LIMIT.

[ILikeMy240sx]

its seems like its bored out its ******* so torque wouldnt increase too much, stroking the motor increases torque.

Formula for torque produced by an engine P*L*A*N

P is your mean effective pressure above the piston (why FI increases torque)N is number of cylinders * rpm/2

L is your stroke pretty much so say you double your stroke, you double your torque (theoretically.. of course you cant double your stroke).

A is the area above the piston so increasing the bore twice will double your torque (theoretically.. of course you cant double your bore).

So increasing the bore and increasing the stroke both increase the torque the same amount.

[virus77]

Good enough, I guess stoking improves lower end torqure more than boring would which is why it feels that way on a bored motor versus a stroked motor.

[RMiller]

A GREATER STROKE DOESN'T LIMIT RPM.... YOUR ROD TO STROKE RATIO LIMITS MAXIMUM RPM. IF YOU CAN INCREASE THE LENGTH OF YOUR ROD WHILE YOU ARE STROKING THE ENGINE YOU WILL RETAIN YOUR REV CAPABILITIES. ROTATIONAL MASS IS ALSO A MAJOR LIMITER OF RPM LIMIT.

I think you're wrong. I was talking about the greater piston speeds due to a greater stroke. The piston speed will not change by changing the rod length. Let's say I want a 120mm stroke. Just increase the length of the rod and I can still rev to 8k right? No, the piston is moving so fast the kinetic energy will overload compressive/tensional forces of the rods.

[PROJECTRB240SX]

changing rod length does change piston speed....Its an old school method to doing things. Thats how chevy can build a 427 ci engine that revs to 9000 rpm or nascar can get the engine speeds they do.

The longer the rod the less speed is transfered in the rotation. Read more here: http://search.netscape.com/ns/...h.htm

[Nismo_Freak]

Why bother... go with a KA if you want a 2.4L engine.

[Tims_240]

thats funny.

-tim
Modified by Tims_240 at 10:43 PM 9/13/2005

[T4 RB25det]

I think you're wrong. I was talking about the greater piston speeds due to a greater stroke. The piston speed will not change by changing the rod length. Let's say I want a 120mm stroke. Just increase the length of the rod and I can still rev to 8k right? No, the piston is moving so fast the kinetic energy will overload compressive/tensional forces of the rods.

that is why people sometimes in heavily stroked cars that still owuld like to have a decently high reving motor do what is called block plateing. you add hight to the deck of the block by using a plate. not easy to do since then you have to resleeve if its an uluminum block, you have to deal with problems associated with welding an aluminum plate onto an aluminum block that affects the combustion chamber. but when done right it works really well

[PROJECTRB240SX]

BTW I WAS DOING THE MATH....A 92MM BORE WITH THE STOCK 86MM STROKE WILL NOT YEILD A 2.4L, ITS ONLY 2286.78CC.

[turbo_lover]

BTW I WAS DOING THE MATH....A 92MM BORE WITH THE STOCK 86MM STROKE WILL NOT YEILD A 2.4L, ITS ONLY 2286.78CC.

so, round 2286.78 and it become a 2.3 I think it would be good for high boost because, wouldn't it thinnin the sleeves? just wonderin. correct if wrong.

[PROJECTRB240SX]

DEPEND ON THE SLEEVES HE IS USING..

IF ITS THE DARTON 88MM SLEEVES, I HEARD A .060 OVER IS AS FAR AS YOU CAN GO AND THAT WOULD BE 92MM. GOING THAT FAR ON SLEEVES IS KIND OF STUPID IN MY OPINION... .040 OVER SHOULD BE THE MAX ON STOCK OR AFTERMARKET SLEEVES FOR STRENGTH AND DURABILITY.

[andrewmp6]

ok guys a 2.4 stroker kit is easy to get http://www.jimwolftechnology.com has one and theres a few 2.2 stroker kits out there