new drivetrain - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Black Apple · 10-27-2002, 09:10 AM

i've finally saved 4000 (cnd) and i've been wanting to do an engine swap for a while, so here's the choises, rb20det or rb25det, yah i know that the sr will be way easier but i don't care.  

I really need help making this decission, i've searched and i still can't decide.

i can get the rb25 to my door for $3500(cnd) don't know about the rb20.

if anyone could help me out it would be realy great, i want to order it in the next month so it'll be here when the snow is falling and the car's off the road.

/etc/shadow · 10-27-2002, 10:49 AM

I hope you know what you're getting into. You're going to need a new radiator, custom driveshaft, intercooler, possibly a new intake plenum, custom downpipe and exhaust, custom IC piping, etc.

I'm looking to do either an RB20 or RB25 swap myself. I have the resources (time, money, and experienced help). The 20 has semispherical firing chambers like old Hemi's and a torque curve that hits max torque around 2000 rpm and flatlines it to redline. The 25, though, has an extra .5 liters of displacement and a stronger transmission.

*DSC* · 10-27-2002, 11:25 AM

Only things I've heard that would be a problem are new mounts (motor and tranny) and the drive shaft.  I have no idea how much work those are.  There was a post the other day talking about custom drive shafts though, seems you can pick up a lightweight aluminium one for around $400.

Doesn't the rb's intake fit in the 240sx or does it hit the hood?  I've seen pics but can't remember whether they had a modified/aftermarket hood or not.  For some reason I think it fits, w/out modification to hood or intake.

r34 gtr · 10-27-2002, 05:45 PM

www.venus-auto.com has the best prices on the rb clips and engine sets, the stock s13 driveshaft will fit on the rb20 (although i dont know about the rb25) and for motor mounts, go to www.unstablehybrids.com, they said they would be available in fall or winter for a few hundred dollars (us). the intake wont clear the hood, so you'll have to notch the support.

Kreator · 10-27-2002, 09:07 PM

I'm not really expert on these swaps (or any swaps for 240 for that matter) but from experience, you'll end up spending WAAAY more than $4000 canadian if just the engine is gonna cost you $3500

Black Apple · 10-27-2002, 11:07 PM

oh, sorry i forgot to mension it's the whole front clip for $3500 to my door,

i'm not new to mod's either, metal, engine, fiberglass, you name it, i've done it, so i know what i'm getting myself into.

Shit i even custom turboed a pontiac6000 2.8l cause i thought it would be cool. (not my brightest idea yet)

i know it'll cost more than 4000 but by the time it get to the driveshaft, clutch etc.. i'll have the moey to pay for it.

so the rb25 it is i guess

boosteds14 · 10-28-2002, 06:30 AM

rb25. go for it. u learn the hard way anyway. so do what you think is best. <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt='

'>

Black Apple · 10-28-2002, 09:32 AM

i'll take pictures and write up a how-to as i go for the rest of you who what to try and do this, though i won't post it for a while, needless to say, it will take me a while to do it.

*sykikchimp* · 10-28-2002, 10:45 AM

yeah, if you've got the resources.. RB25 for sure..  that is a Sick motor, with a beautiful powerband..  very smooth..  you will be VERY happy.

msg · 10-28-2002, 09:26 PM

black apple,
i'm doing the same exact project as you.  We should keep in touch. two heads be better than one.

misnomer · 10-29-2002, 12:48 AM

It's a good project to try out. Though, with the rb25, you'll be more or less pioneering the swap <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/tounge.gif" border="0" valign="absmiddle" alt='

'> I honestly don't think there are too many on the forums who can help out much (unless the guy from Unstable-Hybrids swings back by).Anyhow, good luck, and keep us posted on the progress

10-27-2002, 09:10 AM	#1
Black Apple Join Date: Sep 2002 Posts: 19 Trader Rating: (0) Feedback Score: 0 reviews	i've finally saved 4000 (cnd) and i've been wanting to do an engine swap for a while, so here's the choises, rb20det or rb25det, yah i know that the sr will be way easier but i don't care.   I really need help making this decission, i've searched and i still can't decide. i can get the rb25 to my door for $3500(cnd) don't know about the rb20. if anyone could help me out it would be realy great, i want to order it in the next month so it'll be here when the snow is falling and the car's off the road. __________________ Drive it like you stole it

10-27-2002, 11:25 AM	#3
DSC New Title Join Date: Aug 2001 Location: VA Posts: 3,454 Trader Rating: (0) Feedback Score: 0 reviews	Only things I've heard that would be a problem are new mounts (motor and tranny) and the drive shaft.  I have no idea how much work those are.  There was a post the other day talking about custom drive shafts though, seems you can pick up a lightweight aluminium one for around $400. Doesn't the rb's intake fit in the 240sx or does it hit the hood?  I've seen pics but can't remember whether they had a modified/aftermarket hood or not.  For some reason I think it fits, w/out modification to hood or intake. __________________

10-27-2002, 09:07 PM	#5
Kreator Nissanaholic! Join Date: Mar 2002 Location: MD Age: 41 Posts: 1,975 Trader Rating: (0) Feedback Score: 0 reviews	I'm not really expert on these swaps (or any swaps for 240 for that matter) but from experience, you'll end up spending WAAAY more than $4000 canadian if just the engine is gonna cost you $3500 __________________ кто болеет за Зенит, у того всегда стоит!

10-27-2002, 11:07 PM	#6
Black Apple Join Date: Sep 2002 Posts: 19 Trader Rating: (0) Feedback Score: 0 reviews	oh, sorry i forgot to mension it's the whole front clip for $3500 to my door, i'm not new to mod's either, metal, engine, fiberglass, you name it, i've done it, so i know what i'm getting myself into. Shit i even custom turboed a pontiac6000 2.8l cause i thought it would be cool. (not my brightest idea yet) i know it'll cost more than 4000 but by the time it get to the driveshaft, clutch etc.. i'll have the moey to pay for it. so the rb25 it is i guess __________________ Drive it like you stole it

10-28-2002, 06:30 AM	#7
boosteds14 Zilvia.net Advertiser Join Date: Jan 2002 Location: CIPmotorsports Age: 43 Posts: 1,612 Trader Rating: (0) Feedback Score: 0 reviews	rb25. go for it. u learn the hard way anyway. so do what you think is best. <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt=''> __________________ 240SXONE www.240SXMOTORING.com --- One Stop Shop for Your Nissan 240sx

10-27-2002, 10:49 AM	#2
/etc/shadow Zilvia Member Join Date: Jun 2002 Posts: 167 Trader Rating: (0) Feedback Score: 0 reviews	I hope you know what you're getting into. You're going to need a new radiator, custom driveshaft, intercooler, possibly a new intake plenum, custom downpipe and exhaust, custom IC piping, etc. I'm looking to do either an RB20 or RB25 swap myself. I have the resources (time, money, and experienced help). The 20 has semispherical firing chambers like old Hemi's and a torque curve that hits max torque around 2000 rpm and flatlines it to redline. The 25, though, has an extra .5 liters of displacement and a stronger transmission.

10-27-2002, 05:45 PM	#4
r34 gtr Join Date: Jul 2002 Posts: 15 Trader Rating: (0) Feedback Score: 0 reviews	www.venus-auto.com has the best prices on the rb clips and engine sets, the stock s13 driveshaft will fit on the rb20 (although i dont know about the rb25) and for motor mounts, go to www.unstablehybrids.com, they said they would be available in fall or winter for a few hundred dollars (us). the intake wont clear the hood, so you'll have to notch the support.

10-28-2002, 09:32 AM	#8
Black Apple Join Date: Sep 2002 Posts: 19 Trader Rating: (0) Feedback Score: 0 reviews	i'll take pictures and write up a how-to as i go for the rest of you who what to try and do this, though i won't post it for a while, needless to say, it will take me a while to do it. __________________ Drive it like you stole it

10-28-2002, 10:45 AM	#9
sykikchimp WOW addicted Join Date: Dec 2001 Location: the moon Age: 44 Posts: 6,525 Trader Rating: (0) Feedback Score: 0 reviews	yeah, if you've got the resources.. RB25 for sure..  that is a Sick motor, with a beautiful powerband..  very smooth..  you will be VERY happy. __________________

10-28-2002, 09:26 PM	#10
msg Leaky Injector Join Date: Oct 2002 Posts: 54 Trader Rating: (0) Feedback Score: 0 reviews	black apple, i'm doing the same exact project as you.  We should keep in touch. two heads be better than one.

10-29-2002, 12:48 AM	#11
misnomer Nissanaholic! Join Date: Jul 2001 Location: Nevada Posts: 2,293 Trader Rating: (0) Feedback Score: 0 reviews	It's a good project to try out. Though, with the rb25, you'll be more or less pioneering the swap <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/tounge.gif" border="0" valign="absmiddle" alt=''> I honestly don't think there are too many on the forums who can help out much (unless the guy from Unstable-Hybrids swings back by).Anyhow, good luck, and keep us posted on the progress __________________ Rowsdower saves us and saves all the world!