[unlucky]

So, I've been kicking around the idea of building a QR powerplant for a N/A project. The cylinder head flows excellent on the QR.. and the valvetrain is setup to rev. It uses cam on bucket.. instead of the rocker arm setup the SR has. However, the piss-poor rod/stroke ratio won't let it rev in factory trim. The piston speeds get pretty outrageous at about 6800rpm. There is a destroked version of this motor.. the QR20DE in Japan.. which uses a MUCH shorter stroke. This motor should rev... but it's only a 2 liter. I want to build a big displacement, high(er) revving, street motor that can make at least 250-260whp. Here's what I had in mind..

QR25DE block
Custom 93mm(bore) x 95mm(stroke) billet crankshaft (stock is 89mm x 100.8mm)
Custom billet rods (Pauter or Crower)
Custom forged pistons (10.5:1 C/R)
Sleeved block (necessary for 92mm bore)
Fully ported head with oversize valves (Polk Performance)
Custom camshafts (JWT of course)
JWT springs
Custom Intake manifold (Polk Performance)
AEBS header (bigger primaries)

This should yield a 2.6 (just shy of 2.6) liter motor, that can rev to around 8000-8200rpm. Should make at least 250-260whp. Plus, you can throw nitrous at it if you want more.
Travis

 

[Bjorn]

why not just add a deck plate and keep the stock crank?

 

[unlucky]

I think when it's all said and done... it will end up costing about the same... I'd rather have a beefier crank in the motor..
Travis

 

[Cjburn]

I'm a huge fan of Cunningham rods. Alot of their customers are road race teams. They do things a little differently, but really do make a great rod. www.cunninghamrods.com
Might be worth your time Travis.

 

[nizzan4u2nv]

That would be cool, give all the spec owners something to live for.

 

[2xSE-R]

This sounds interesting. Definately keep us updated.

 

[choaderboy2]

So, I've been kicking around the idea of building a QR powerplant for a N/A project. The cylinder head flows excellent on the QR.. and the valvetrain is setup to rev. It uses cam on bucket.. instead of the rocker arm setup the SR has. However, the piss-poor rod/stroke ratio won't let it rev in factory trim. The piston speeds get pretty outrageous at about 6800rpm. There is a destroked version of this motor.. the QR20DE in Japan.. which uses a MUCH shorter stroke. This motor should rev... but it's only a 2 liter. I want to build a big displacement, high(er) revving, street motor that can make at least 250-260whp. Here's what I had in mind..

QR25DE block
Custom 93mm(bore) x 95mm(stroke) billet crankshaft (stock is 89mm x 100.8mm)
Custom billet rods (Pauter or Crower)
Custom forged pistons (10.5:1 C/R)
Sleeved block (necessary for 92mm bore)
Fully ported head with oversize valves (Polk Performance)
Custom camshafts (JWT of course)
JWT springs
Custom Intake manifold (Polk Performance)
AEBS header (bigger primaries)

This should yield a 2.6 (just shy of 2.6) liter motor, that can rev to around 8000-8200rpm. Should make at least 250-260whp. Plus, you can throw nitrous at it if you want more.
Travis

I think the boore should be limited to 91mm for head sealing reasons. The sucess would all depend upon convincing JWT that they need to make a huge cam for the QR were there is little market for it.

Mike

Mike

 

[blackspec]

mike, I think you should take a look over at thevboard.com or b15sentra.net there is more than enough people that are interested in n/a development of the QR motor. Along with ecu.

 

[unlucky]

I think the boore should be limited to 91mm for head sealing reasons. The sucess would all depend upon convincing JWT that they need to make a huge cam for the QR were there is little market for it.

Mike

Mike

Even on a sleeved block? This is using AEBS sleeves. Do you think it's possible to get that much power out of a 2.6 liter QR with good cams?
Travis

 

[jamse-r]

I think a QR project would be perfect for a G20.

 

[Nismo654]

I think it is totally possible and a great idea if you have time and $$$$. Now stick that thing in a classic and you have something really nice...lol

 

[nite-stalker]

who do u have in mind for the custom crank?

 

[SpecVMaster]

i think it's great Travis please keep me informed on this

 

[Storm88000]

SR20DE > QR25DE

Hah, just kidding.

Or am I?