Rb26 Question

[sycorb]

hi all im building my rb26 has a jun 2.7 stroker kit i want to know if i should run 280 deg cams with 11.5 lift or go smaller just a street car may do some curcuit work i got hks rs turbos but later want up grade to to4z im chasing in the region of 400 to 500rwkw what do you think guys and gals

[s2d4]

Circuit work? and you are choosing big cams to make it even more laggy when those turbs are lag monsters already? Are you sure?

hi all im building my rb26 has a jun 2.7 stroker kit i want to know if i should run 280 deg cams with 11.5 lift or go smaller just a street car may do some curcuit work i got hks rs turbos but later want up grade to to4z im chasing in the region of 400 to 500rwkw what do you think guys and gals

Edited June 18, 2010 by s2d4

[Deano 1]

As far as i no, when you build a stroker, you go a smaller cam cause the turbos come on quicker.

them size cams would be for a 2.6 running RS Turbos and everything balanced right up so it can rev. Specaily for circuit work. Its either one or the other, Revs or CC's...... as far as i no..... anyway

[R31Nismoid]

hi all im building my rb26 has a jun 2.7 stroker kit i want to know if i should run 280 deg cams with 11.5 lift or go smaller just a street car may do some curcuit work i got hks rs turbos but later want up grade to to4z im chasing in the region of 400 to 500rwkw what do you think guys and gals

The T04Z is not an upgrade over GT-RS's.

[dazmo]

What if anything is going to be done to the head ?

And who is building your engine ?

I would be having a good chat with them in regards to the whole package and what you idealy want to achieve.

Cams are always a compromise in the respect that to get more top end you will sacrafice bottom end and vice versa',

If you are having the engine built by someone experienced with RB26 or RB stroker engines they should be able to provide you with a combo that will best suit your end goal.

Just dont get to fixated on peak power especially if circuit racing is the main priority as the fastest car at the track is not always the one with the most power.

[bigmikespec]

As far as i no, when you build a stroker, you go a smaller cam cause the turbos come on quicker.

[sh@un]

far too large for what you have in mind

cams won't 'drop in' either- the top of the heads will need extensive machine work to provide clearance for the cam lobes

[lotsalag]

Yeah, too wild for ur application i think! Go something smaller, something to at least avoid head machining for clearances. Then advance up that inlet cam alot maybe to the max, and enjoy possibly 500rpm better response, ive seen it on a built gtr with -10s.

Generally the larger the engine the more tame an equivalent cam will be to my knowledge, ie a big rb25 cam will be even bigger and lumpier for an rb20, it comes down to cc's per cylinder basically.

rb26 and rb27 tho, not sure ur gonna get too much difference, head work would probably influence cam performance more than an extra 100cc. redline in both ur rb27 will be similar to the 26 i'd assume.

if it was an rb26 vs rb30 hybrid question, its a tough choice for cams, u need a decent size to breath with extra cubes, but cos it wont rev hard without big dollars, the cams might be in vain cos the profile and duration is more for top end!

Sorry bout the rant, tried to keep it simple. just my 2c.

[sycorb]

i am building engine myself got offered a good rb26 head with loads of head work done that has the big valves and so on. its that or im getting a head done up by a friend that has done a heap of big motor v8s so he has done a few in his time.this will be my first rb26 build just trying to get some ideas

does any1 recommend some 1 i can talk to

thank for the comments i will take them on board

[lotsalag]

Speak to someone in the know for sure. But decide what ur hoping to rev it to, powerband, power goals etc and what else will be done throughout the motor before deciding on cams tho.

i found the guys at camtech to be helpful

http://www.camtechcams.com.au/

cant remember his name, but one guy there seems to know his rb's pretty damn well, see what he has to say.

good luck

[blitzxtr]

Have a chat to Paul at Red R Racing, ive personally seen him make turbos come on earlier by switching to larger camshafts. Its all in the headwork (port and chamber design). Just changing the head design and cams on one car made it come on boost nearly 1000rpm earlier and the difference in the torque curve was incredible.

He used to run Tomei 260's with his GT-RS's and it was a laggy pig, he re-did the head with big JUN items and it was like a completely different car making peak torque really early without dropping off till about 9500rpm.

im running 280deg cams in my car with a HKS T04Z, come up to Newy and ill take you for a drive.

Edited July 19, 2010 by blitzxtr

[snozzle]

the 280s sure will idle like a monster lol