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To 30/26 Or Keep The 26?

SIR-JD

By SIR-JD,
in Engines & Forced Induction

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Piggaz
Piggaz

"Rev harder" For a joe blow,average guy, why do you want to spin the engine to the moon and back? It just won't last. Stroker or RB 30 all the way. More twist ... EVERYWHERE!

SimonR32
SimonR32

A SR20 as it would have more torque in the used rev range.

Piggaz
Piggaz

Couldn't be too high, 30's don't rev... Or something

Posted Images

SimonR32 Grand Master

SimonR32

Posted
Posted (edited)

Horsepower sells cars, torque wins races!

Better tell that to the F1 manufactures...

Actually tell that to any race team that runs a turbo car that smashes larger displacement higher torque V8s. Do you remember Group A?

Or maybe you should grab a 6L turbo diesel and take it to the track and you will obliterate everything!

I personally love that phrase, makes it easy to pick out people with no clue

Edited by SimonR32
zebra Grand Master

zebra

Posted
Posted

Lets compare apples here.

take for eg the current tube frame v8 supercars.

you have a choice, a 600hp SR20 or a 600hp 5L V8

but both still have a minimum weight of 1250kgs, same suspension same tyre etc.

which would you choose?

SimonR32 Grand Master

SimonR32

Posted
Posted

Lets compare apples here.

take for eg the current tube frame v8 supercars.

you have a choice, a 600hp SR20 or a 600hp 5L V8

but both still have a minimum weight of 1250kgs, same suspension same tyre etc.

which would you choose?

A SR20 as it would have more torque in the used rev range.

  • Like 1
XGTRX Veteran

XGTRX

Posted
Posted (edited)

A SR20 as it would have more torque in the used rev range.

And it would be geared so it would be in its sweet spot all the time, it would rev faster through its peak efficiency range and deliver torque to the wheels at a faster rate. therefor be much faster overall

Give me a rota spinning to 15000 rpm please

Edited by XGTRX
France Community Regular

France

Posted
Posted

Lets compare apples here.

take for eg the current tube frame v8 supercars.

you have a choice, a 600hp SR20 or a 600hp 5L V8

but both still have a minimum weight of 1250kgs, same suspension same tyre etc.

which would you choose?

SR20, because it sounds better :ninja:

GTRPSI Mentor

GTRPSI

Posted
Posted

RB30 = Better rod stroke ratio.

RB26 = less registration issues here in VIC.

It it was without a custom crank id be going 30, if it was Regoed in VIC id be going 26.

There are lots of arguments for and against it, just as many for gear ratios, turbos etc which would make more changes at improving or ruining each engine sizes characteristics.

You need to look at it as a package, not just a engine package but including weight, gearing, tyres, track etc.

People like Berry successfully running a time attack RB30, lots of others running RB26's, some with stock cranks, some with strokers.

r32-25t Grand Master

r32-25t

Posted
Posted

Better tell that to the F1 manufactures...

Actually tell that to any race team that runs a turbo car that smashes larger displacement higher torque V8s. Do you remember Group A?

Or maybe you should grab a 6L turbo diesel and take it to the track and you will obliterate everything!

I personally love that phrase, makes it easy to pick out people with no clue

have seen what the Americans are doing with Diesel engines these days or have been living under a rock?
Lithium Grand Master

Lithium

Posted
Posted

I'm starting to feel like I am wasting too much time on forums, but I had already thrown this together to ponder it visibly so I thought I'd throw this into the mix given that piston speeds/acceleration relative to rod length and stroke seems to come up in these conversations all the time - my maths may or may not be right here (looks close to legit to me haha) but this is more just to get an indicator of the sheer acceleration of the piston (at the pin) of the different factory RB layouts.

I have used this calculation to work out piston acceleration relative to crank angle (l = rod length, r = crank radius, A = crank angle, 0deg crank angle = TDC):

post-11136-0-09400100-1382496780_thumb.png

Piston acceleration to sustain equivalent rpm:

post-11136-0-31005500-1382496878_thumb.png

Piston acceleration to move equivalent swept volume:

post-11136-0-93884400-1382496898_thumb.png

I did it for my own interest so I figured I may as well share it as I know that some other people like to ponder on this kind of thing too. If anyone have a better (or more OCD) handle on physics/maths then feel free to correct or add to it - but again I will probably make myself relative scarce after this so I'm adding it before I lose the bits and pieces I put together.

Cheers.

Cowboy1600 Grand Master

Cowboy1600

Posted
Posted (edited)

Sound... I'll just leave this here:

K'n hell. How many million revs is that thing pulling as it crosses the line? Sounds awesome.

Edited by Cowboy1600
Cowboy1600 Grand Master

Cowboy1600

Posted
Posted

Le Mans :P

Where they are quite a bit slower than the other cars but way more fuel efficient so don't have to stop as often.

It's not the torque which makes them competitive.

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