building motor help needed

[dee242]

building motor help needed

So i finally put a rod through the block looking for about 500 hp.  So I am getting another rotating assembly im thinking for parts cp pistons, manley rods and spool import billet oil pump gear  then swapping my head over.  http://www.rawbrokerage.com/cp-pistons-manley-rods-combo-r33-rb25det/

Im not to sure what head gasket or thickness  I need and if i should run race main bearings and end bearings or if I should just go oem.

Can you provide insight on what other parts i will need or you recommend as this is my first build. 

[33GTRV]

Go to a reputable engine builder, no offence but it sounds as though you arent too familiar with rbs or engine building. 

[dee242]

Im pretty set on doing it myself as i am a heavy duty mechanic 

 

[KiwiRS4T]

Go to the forced induction section and read through the latter part of the RB25 turbo upgrade section - some people put a fair bit of detail in the description of their engines (some less so). If you are going to the expense of forged components then you should plan to fully balance the whole rotating assembly. Aim for better than 9:1 compression. I would get a Tomei metal gasket simply because they can be reused in the event that your head has to come off again. Is it a street car or do you plan to track or drag race it?

[dee242]

It is going to be a street - drift car and thanks will have a read

[KiwiRS4T]

OK then you should probably have a read of say the last third of this thread as well:

 

[dee242]

so far ive come up with 

rb26 rods

oem bearings 

spool billet oil pump gear

extended crank collar

balanced bottom end

forged pistons 86mm 9.0.1

tomei headgasket

tomei poncams

oem gasket set

arp head studs 

arp main studs 

 

[dee242]

should oem bearings be sufficient or should i upgrade to something else this is going to be mainly a street car so longevity is key

[89CAL]

ACL bearings probably arent much more than standard (maybe even less) so can't hurt to run different bearings. OEM should be fine but

[dee242]

i heard mix reviewsof acls not being that great and score the crankshaft 

[33GTRV]

Dont buy bearings until you know what clearances you want to run.  If you are using stock rb26 rods install the rod bolts, torque to spec and check the sizing. Most of them need to be resized with arp fasteners. Same goes for the main studs. Install, torque and measure the tunnel. I highly doubt you will have a dial indicator setup on a bore guage small enough and long enough to accurately measure it. Bearings dont score journals. Poor clearance and assembly does

[dee242]

so a few things have changed i have acl race bearings now and over bored to 86.5mm with the 9.0.1  cr pistons should the stock head gasket be ok to use or what one should i use  and thickness i have arp headstuds

[dee242]

i got a 1.3mm headgasket and the motor is done now 

[dee242]

I tried priming the motor today but got no oil pressure any tips

[KiwiRS4T]

Does the motor turn ok? Did you plasti gauge the bearings? Check the oil pump before installation? What do you mean by "priming the motor"? Were you spinning it over on the starter?

[dee242]

The motor spins freely I unplug the cad and spun it with the starter for 30 sec to try and build oil pressure before starting it stock oil pump internals was swapped out for spool imports I'm going to try pouring some oil down the filter housing so it runs into the pump and try again

[Ben C34]

Did you grease the oil pump when installing it?

[GeeDog]

Plugs out? It will spin a bit faster. We had to crank for a bit longer than expected, but pressure came up fairly quickly.

[dee242]

I did grease it and no plugs are not out

[dee242]

So I pulled the plugs and added oil to the filter built pressure instantly and it's alive now 

IMG_1052.MOV