Rb25Det Block Bottom End Question?

[HR31-PASSAGE]

is the block bottom end the same on rb25det series 1 & 2?

cheers

[89CAL]

As far as i know the only different is in the top end

[mad082]

is there even much difference in the top end?

[SECURITY]

pretty sure the bare motors of series 1 and 2 rb25det are the same.

[89CAL]

There's a slight difference with the VCT but I'm pretty sure it doesn't have anything to do with the head. I know the bottom ends are the same so was just covering my bases and not saying the top end is the same lol.

Neo engines are different top end

[HR31-PASSAGE]

ok sweet, just needed to know as i done a big end on the dyno & my engine is a s2 & been offered a s1 block...

cheers for the info guys

[FineLine]

ok sweet, just needed to know as i done a big end on the dyno & my engine is a s2 & been offered a s1 block...

cheers for the info guys

Yup, ed zackery the same.

[HR31-PASSAGE]

ok now another question

i'm looking at doing an rb30 block "rb25/30det" anything i need to know? i'm going to be using my original rb25det for the parts so what machining will need to be done? & will i have to change my exhaust as the 30 block in abit longer then the 25 block...

thanx

[89CAL]

Be prepared for it to cost money.....

RB25/30 Guide

[SECURITY]

Follow the guide posted. Just get prices on machining from your local machine shop to do the crank collar machining and fitting as well as balancing everything.

[89CAL]

I would stress that you think long and hard before undertaking a project like an RB25/30. It could end up costing alot in parts and labour (if not doing it yourself)

If your goals arent terribly high then consider just getting an RB26 but your car so you do what you want to do. I was just advising lol

[JonnoHR31]

converting from a 25 to a 26 costs a lot more than 25 to 25/30.

[HR31-PASSAGE]

thats some really use full info in that thanx heaps guys i seriously wouldn't of found that much info in 1 spot

anyways i've sourced an already built rb30 block (acl race bearings, genuine nissan piston ring kit throu out, arp con rod bolts, balanced & cyro crank, chemically cleaned block. all seals & gaskets, modified oil pump & drilled tapped block for extra pulley)

i'm guessing this would be the best way to go, what are your thoughts? all info would be great

[SECURITY]

converting from a 25 to a 26 costs a lot more than 25 to 25/30.

spot on.

once you get the little fiddly things out of the way its much easier and much cheaper. especially if you break something you're spending $50 on a new block and you're set.

if you've sourced a block thats already built i'd definitely be looking into getting it re-checked as well as throw in some new bearings and rings as well as have a look at the oil feeds are the right size, that way you've basically got a brand new one.

[HR31-PASSAGE]

spot on.

once you get the little fiddly things out of the way its much easier and much cheaper. especially if you break something you're spending $50 on a new block and you're set.

if you've sourced a block thats already built i'd definitely be looking into getting it re-checked as well as throw in some new bearings and rings as well as have a look at the oil feeds are the right size, that way you've basically got a brand new one.

ok sweet. in that info it says head needs to be modified but doesn't say what need modifying. do you know what they mean by that?

[SECURITY]

all the information is in that doc and in the rb30 build thread. you need to get an oil feed to the VCT if your head has VCT as the rb30 block doesnt have an oil galley that lines up with a VCT head. your best bet is to go into the rb30 build forums, read the main thread and then ask your questions if you're still having problems.