2 motors for sale but I dont know which one to buy!

[240SETulsa]

Im happy with my decision and I trust this guys experience. He has had most RB motors available (20,25,26 he even has a 30 right now he is working on).

He really sat me down and we discussed the pros and cons of both and he related to me the issues he has seen 25s have. Remember this is a DD and as such he explained that the 20 would be very reliable and less complicated and prone to issues.

The 25 has a lot more monitoring going on and can have a higher degree of "wtf is wrong this time". I trust I still can make 400hp (rough target) with the rb20 without a huge fuss and still have a reliable car.

Edit: Looking at everyone's sig and car info thats responded most of you have an SR. Not saying you havent had an RB but this guys lives and breathes RBs.

[Eikon]

Just for reference.. I had a RB20 for 3 years. I worked on my brother's SR a ton, so I'm pretty experienced with both motors.
Trust me when I say that you should never chose a 20 over a 25 unless it's for a big cost savings. You can make 400 from a RB20, but it won't be easy, and it won't be a daily driver at that point. The 25 will also not be a daily driver at 400hp, but it'll be easier to get there and more reliable once you are there.. 400 hp is widely held as the top limit for 20's stock internals. 25's are usually good to 550 or more. The same holds true for the transmission... 400 is pushing it on the 20. The 25 trans will hold 1000 hp if asked to.

I just can't understand why you'd chose a smaller, older, weaker motor for the same price? Sounds like the guy you are buying from is a good salesman... Anyone who could sell a person a RB20 for the same price as a 25... good salesman!!!

The crank collar issue is no big deal unless you are pushing huge hp... and many of the 25's actually had the correct crank collar...

Still... my original advice holds.. I would have gone SR for a daily driver. Especially living in such a hot summer climate.

But... I wish you the best of luck. Be sure to check in the RB forum.. you'll need to make friends with those guys as you'll be back regularly asking for advice and help on maintenance and modding.

[numbnuts240]

there's a lot of truth in the above post.

[240SETulsa]

Well essentially it was 3 motors SR BT, 20 and 25. 20 came with a few extra goodies.

As for these "hot summers" you guys are talking about, the hottest times are maybe a cpl weeks of 90-103 (past 100 is pretty rare and maybe only happens a cpl days at best during a typical summer).

Ive got a large aluminum radiator, FMIC, and dual electric fans lined up. Ill be fine.

Ill keep you guys posted on everything, maybe im quasi unique in my area with the 20 (there is maybe 2-3 in Tulsa with an RB, there is actually more R35s than RB 20-25s seems like). People in OK that own an RB all belong to the same club nismokc.com and they like their 20s and 25s.

What dictates it not being a DD? Larger injectors, a nistune, slightly larger turbo that will push you up into mid 300s without much fuss. Im excluding the no brainer upgrades.

I do think he was going to charge me a bit extra for the additional wiring needed on the 25.

I do appreciate everyones input though.

[sci2000tech]

Once you set up your cooling system properly, you shouldn't have any trouble with overheating.

I use to DD with my rb20 in 110 degree weather here in Phoenix, no problem. Ducting is key.

The SR would probably be easier to find parts for, but it sounds like you've made up your mind. The rb20 is a great little motor once all the kinks are worked out. And the sound of an inline 6

[E7-S14]

You ask for advice on which motor to buy, then you get your mind set on the rb25, which is older, weaker, smaller(than a KA).

dude. the older the motor, the harder it will be to get parts for it. s*** will break down. its a Nissan.
For DD.. an SR will be more than enough for you.

judging from your posts, i doubt you have much experience with any of these motors, so im sure the SR will be enough power for you to begin with, and be easy enough to work on by your self, instead of having a mechanic that can sell an rb20 for the price of a rb25 to you.

Listen to the collective knowledge in this thread. its true some of it is not the best, but most guys on here KNOW what they're talking about.

[drewce]

You ask for advice on which motor to buy, then you get your mind set on the rb25, which is older, weaker, smaller(than a KA).

dude. the older the motor, the harder it will be to get parts for it. s*** will break down. its a Nissan.
For DD.. an SR will be more than enough for you.

judging from your posts, i doubt you have much experience with any of these motors, so im sure the SR will be enough power for you to begin with, and be easy enough to work on by your self, instead of having a mechanic that can sell an rb20 for the price of a rb25 to you.

Listen to the collective knowledge in this thread. its true some of it is not the best, but most guys on here KNOW what they're talking about.

you mean the rb20***


personally i would go with the rb25 but thats me if you want a reliable dd go for the sr no questions asked. and the rb is a 2.0 liter and is heavier than the sr and not to meantion harder to get parts so i don't know why you would choose to go that route but anyways your car goodluck!