Jump to content
SAU Community

Recommended Posts

Is it worth stroking a 25 to 2.7 with the 26 crank rods pistons and etc or would it be more feasible to just build a 26?

What would be the advantages and disadvantages using the 25?

Car is a 32 sedan and will hopefully be used for a bit of circuit and road use.

Am open to all advice. AAANNNNDDDD GO...

Link to comment
https://www.sau.com.au/forums/topic/337080-is-it-worth-stroking/
Share on other sites

stroked 2.7 RB25 would be good, but remember (unless you use a neo 34 head) it's still gonna have hydraulic lifters, and wont be as rev happy/efficient as a 26 head.

That said both options make great power, there's really nothing to win one over the other...

considered a 26/30 or 25/30?

stroked 2.7 RB25 would be good, but remember (unless you use a neo 34 head) it's still gonna have hydraulic lifters, and wont be as rev happy/efficient as a 26 head.

That said both options make great power, there's really nothing to win one over the other...

considered a 26/30 or 25/30?

Mine revs to 9000rpm, hydraulic lifters and Tomei springs :dry:

Mine revs to 9000rpm, hydraulic lifters and Tomei springs :dry:

Hmm fair enough!

I stand corrected :D

That is sorta true as a general rule though right? Solid lifters are more efficient and more rev happy than hydraulic types?

Hmm fair enough!

I stand corrected :dry:

That is sorta true as a general rule though right? Solid lifters are more efficient and more rev happy than hydraulic types?

Yes, and you can get a solid lifter conversion kit to make the RB25's solid, like the Neo's, but for the cost it wasn't worth it. Instead we opted for the valve springs, and hasn't missed a beat. To be honest those, on most engine setups I've seen the engine is out of efficiency before 9k.

I've considered a couple of combos but for me the 2.7 stands out a little more because its different. The donor motor is a 33 series 1 as far as i can tell. The combo i'm looking at is

34 crank

nitto rods

JE Pistons

nitto oil pump

272 cams with springs

sard 750's

gt35 with 6 boobs and whateva else is required

rb30 bottom end is hard to pass up, alot cheaper than stroking the rb25 and if anything stupid goes wrong the bottom end is alot easier to replace. Wont need such a large duration cam as youll have more torque earlier and wont need to revv as much... i find my gt35r is still a bit laggy for my liking on the 3litre, but heaps better than the 25.. a good 700rpm, if you can wait until the end of the year ill have mine rebuilt and back on the road.. can take you for a spin and see if you like it.

Jarrod

+1 for the 30DET, you're rebuilding anyway so go splash $100 on an RB30E, buy pistons and rods to suit and longnose the crank, use your 25 head and the cams you were planning on. Go the GT35R with .82 (minimum) or 1.06 housing.

If you go the 30 make sure you let Kyle know it's a 30 in a 32gtst so the manifold will fit. He'll also want you to get a 50mm gate.

Bart, have you got a VQ in a car in your shop? will call past and have a sticky beak if you do

And Bubba by longnose the crank is that the collar you stick on it to suit the oil pump?

Edited by turboedsloth

Yeah I mean put a crank collar on so you have the long oil pump drive like 33/34gtr cranks.

Personally I'm welding the snout of my crank and machining back to suit my specific gears as opposed to using a generic collar that's toleranced to suit a variety of gears. Some people don't like the idea of welding the crank though so it's an each to their own thing. The reason I'm going down that path is that I firmly believe the common destruction of gears is due to the poor tolerancing between drive and gears.

i have the 0.82 exhaust housing on the gt35r

i quite like your idea there bubba.. i had a crank collar fitted on my car and my oil pump failed in a very strange way... the outside gear ended up in about 10 bits, i am hoping to rectify the problem with a better balance, harmonic balancer and a billet pump, i might have to check the clearance between the collar and the pump.. one of the engineers i took my pump to said it looked like there wasnt enough clearance axially for the gears.

Jarrod

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Pressure when IDLING, is meant to be 51PSi... So that amperage value needs to go up a fair chunk... I'd personally be factoring for more like 12amp at least on those runs, and at that point you need to hope the already there wiring doesn't drop you a volt or two, as that's a lot of fuel pressure flow drop off from 13.5 to 12V! Taking idle pressure of 51psi, means the pump will be drawing a MINIMUM of 9amps all the time based on your reading of the graph (3bar base, then allowing an extra 0.5bar for boost = roughly 51psi)
    • Hi all,  I am in the market for an R200 longnose diff out of a Z31 300ZX, or S12 RSX, DR30 skyline, or similar, in a 3.9 ratio.  Preferably a late model one with the M12 crownwheel bolts.  The only easy to find advert for one of these was my ad back in 2007 when I sold it on this forum.  I sold the diff as I had sold the car it goes to, but as it turns out, after 18 years I got the car back late last year, so now I'm looking for the diff !  If anyone knows where to find a longnose R200 LSD with the M12 crownwheel bolts, drop me a line at [email protected] - Bonus paid if soomeone comes up with the original diff (stranger things have happened !).  Cheers   Ben D    
    • Hi everyone, I used to post here a bit from 2004-2013, when I owned various Nissans, in particular my S12 RSX gazelle, which was sold in 2007.  As luck would have it, after an 18 year hiatus, the car found its way back to me last year, and over the past 11 months I have had the pleasure of restoring it with my kids.  One thing that I am after in particular is a 3.9 ratio R200 LSD for it.  I actually sold the one out of the car here back in 2007 , and it would be incredible if I could track down who I sold it to, so I can see how they have progressed over the years (and to be honest, to see whether I can get the diff back !).  Anyways, hi all and let me know "where are the R200 Longnose diffs all at these days ?  Cheers Ben D  
    • Arms will be the same as the G35 or 350Z, but as above, there was a change in the lower control arm where it connects to the ball joint.  That said, you can remove the ball joint cone from your old ball joints and fit them to the new ball joints.  To be honest, I didn't think the ball joints themselves were different. The main ball joint is a bit awkward to replace, you really need to remove the steering knuckle to press out the old one.  Some people have used tools to remove it in place, but it just seemed too hard to get to. If you are going to press out/in that ball joint, then you may as well just replace the bushings in the LCA and the compression rod.  You can buy the compression rod bushing from Nissan, but the LCA bushes, you will need to go aftermarket. Much cheaper than buying the whole arm.
    • Ha, well, it's been.... a bit of a journey. Things have taken much longer than I'd hoped. I'll probably put up a thread at some stage. Hopefully soon. The car's not done any kms since my update in June though, put it that way.
×
×
  • Create New...