Rb25 To Rb28 (tomei Stroker Kit)

[SKY 34]

doing research for rebuild atm, I found tomei stroker kit, but don't really understand what they are asking if anyone can explain..

the kit includes

- Forged 8 counter crankshaft

- Forged piston kit

- Forged H section connecting rod

- Oil Jet Spacer

here are the options I don't get

option between

-Bore 86.5mm

-Bore 87mm

-Bore 87.5mm

-cooling channel Bore 86.5mm

-cooling channel Bore 87mm

-cooling channel Bore 87.5mm

-RB 28 titanium coat (top ring)

what is a cooling channel? I thought in Engineering shop the engine block is bore into the diameter of the piston? They number the piston for the specific cylinder for accuracy? so what's the point of choosing bore diameter? more torque?

[VB-]

doing research for rebuild atm, I found tomei stroker kit, but don't really understand what they are asking if anyone can explain..

the kit includes

- Forged 8 counter crankshaft

- Forged piston kit

- Forged H section connecting rod

- Oil Jet Spacer

here are the options I don't get

option between

-Bore 86.5mm

-Bore 87mm

-Bore 87.5mm

-cooling channel Bore 86.5mm

-cooling channel Bore 87mm

-cooling channel Bore 87.5mm

-RB 28 titanium coat (top ring)

what is a cooling channel? I thought in Engineering shop the engine block is bore into the diameter of the piston? They number the piston for the specific cylinder for accuracy? so what's the point of choosing bore diameter? more torque?

choosing the bore: more capacity = more power. also, it gives you scope for future rebuilds, like getting the 86.5 now, if you ned a rebuild later, you can bore it out to 87, not that this is a realistic thing IMO

cooling channel, i have no idea, but im guessing its size depends on what piston bore you get, to maintain a certain thickness between it and the nearest cylender. might be a restrictor for the cooling system somewhere?

might i ask how much this is costing you roughly, and why you didnt just get a local RB30 built up?

[SKY 34]

I was thinking about power and torque differnece as well but I don't believe it myselft....the gap between the sizes is 0.5mm, I don't think there'll be much difference...

the kit alone cost $7.5 k but these are Jun so kinda expected....I think fitting and bore from 6-7k.. I have not done this yet, collecting info...there is the cheaper option of using CP or arias stuff...I think those cost about $5k includes N1 oil pump head studs...

I'm going to stick with RB25 no particular reason actually just personally think there's more work involved, more challenging...

[bnr#@]

Cooling channel refers to the cooling channel pistons which as the name suggests have a channel I believe in their crowns for the oil to run through and keep them cool more then normal forged pistons

[R TUNE]

personly i would have gone the RB30DETset up cause u have bigger capacity = more tourque and power, just use u'r RB25 head with or with out VCT and work that would cost a lot less and be as relierble (i.e put forgys in it).

[SS8_Gohan]

if you were to go the RB30DET using a NEO RB25DET, how much coin are you looking to part with, driving away from the workshop?

[SKY 34]

so is that those indented shape at the sides of the pistons?

Aorry, the kit is actually Tomei.. there is a $1k price difference between the normal and hte cooling channel one....do you think it's worth the money... How bout CP kits? anyone know how big cc after bore?

cheers