Hayabusa and sv piston size, cylinder and clearnace information

[barwel1992]

Hayabusa gsxr1300 00-07 piston swap for the sv.

Im posting this just in case any one else wants it.

this will help with honing the cylinder to get the correct piston to cylinder clearance.

BUSA piston and bore

cylinder bore: 81.000-81.015 (3.1890 - 3.1896in)
Piston size: 80.970 to 80.985mm (3.1877 - 3.1883in)
piston service limit: 80.880 (3.1842in) at 15mm (0.6in) from skirt end at 90o from pin
Piston to cylinder clearance: 0.020 - 0.030mm (0.0008 - 0.0012in)

SV piston and bore

Cylinder bore: 81.000 - 81.015mm (3.1890 - 3.1896in)
Piston size: 80.940 to 80.955mm (3.1865 - 3.1871in)
piston service limit: 80.880 (3.1842in) at 20mm (0.78in) from skirt end at 90o from pin
Piston to cylinder clearance: 0.055 - 0.065mm (0.0021 - 0.0025in)



you need to run the sv Piston to cylinder clearance when using the busa pistons this means the sv cylinder bore need to be increased with a hone.

this all means that from the smallest cylinder size of the sv and the smallest piston size of the busa the hone that is needed would be 0.030mm (0.0011in) giving 0.060mm (0.0023) piston to cylinder clearance. This will change from piston to piston and cylinder to cylinder so get them measured when doing the hone and work out the correct clearance.

please correct me if im wrong on any thing thanks.

[barwel1992]

some more info

you will need 2 pre 2008 gsxr 1300 pistons and 2 pin's and 4 cir clips

2 cylinder head gaskets (front, back) and 2 cylinder base gaskets (front,back)

2 sets of sv piston rings

sv cylinder hone dependant on the exact measurements of the cylinder and piston, for measuring the piston follow the instructions from the hayabusa menu.

you do not need to drop the engine.

you need to remove throttle bodies/carbs, exhaust. to get aces to the cylinder's and heads

i will update things when i actually do the swap.

[svsam]

does it make that much of a difference?

[danf1234]

Ditto, What will this give the bike out of interest?

[barwel1992]

Most likley wont be that much but with the combination if mods that im doing it will all add up

the pistons are 17g lighter each so you have less recipicating mass to there is less load on the crank, it aparently helps the engine spin up faster, obviously means its in the power band quicker.

while im at it i will be thining the head gasket to raise the compresion, and slotting the ignition pick up as well. and with the rest of the mods should have a healthy increase in power across the range.

[widget]

So as if you was fitting a lightened flywheel?

[barwel1992]

So as if you was fitting a lightened flywheel?

Yes, but most of the lightend fly wheels mean i have to run a constant loss charging system (unless some on knows of a way to lighten it without losing the charging system)

[squirrel_hunter]

Why are you using SV piston rings?

[yorkie_chris]

So as if you was fitting a lightened flywheel?

Rotating mass vs reciprocating mass...

[yorkie_chris]

Why are you using SV piston rings?

'Busa has electroplated ally cylinders, SV has steel liners.

[yorkie_chris]

Yes, but most of the lightend fly wheels mean i have to run a constant loss charging system (unless some on knows of a way to lighten it without losing the charging system)

Machine down the starter clutch, you can't take much out though, you could also skim the flywheel a bit, but not by much

[squirrel_hunter]

'Busa has electroplated ally cylinders, SV has steel liners.

Now I didn't know that. So what would happen if you used the 'Busa piston rings in the SV cylinders?

[yorkie_chris]

Dunno, might wear quite quickly

[barwel1992]

they would most likely over heat and warp (according to my tutor), the busa has better heat dissipation because of its alu cylinders (nickel plated) the sv steel liners make the pistons run much hotter hence the 0.055 sv clearance vs the 0.020 of the busa (heat expansion)

[squirrel_hunter]

The only reason I ask is this is the first time I'd heard about replacing the rings. Not read about that before, anybody know someone who's done it to confirm?

[barwel1992]

The only reason I ask is this is the first time I'd heard about replacing the rings. Not read about that before, anybody know someone who's done it to confirm?

zoran on TWF has i think and a few others on there

READ ME (http://www.twfracing.com/vbforums/showthread.php?t=877)

[barwel1992]

PS will have 2 busa pistons and pins for sale soon as well if any one else wants a go lol

[squirrel_hunter]

Thanks. Hopefully I still have those SV pistons...

[barwel1992]

Thanks. Hopefully I still have those SV pistons...

do you mean busa ? ;) lol

ps get piston rings and gaskets from zoran they are literlay half the price of the uk stuf EG 2 sets of piston rings cost £45 from him from suzuki uk they cost £45 per set so £90 .... you get the idea :D

[squirrel_hunter]

Nope I mean the SV ones I took out as they will still have rings on them. I know exactly where my 'Busa pistons are...

[barwel1992]

ahh, you should use new rings though with the new hone so they ware and mate together

[barwel1992]

ohh and just so every one knows

the SFV gladius now has alloy/plated cylinders with the same size pistons as the busa not sure what the piston to bore clearance is but i bet its about 0.020-0.030mm

[svsam]

PS will have 2 busa pistons and pins for sale soon as well if any one else wants a go lol

may have to take you up on that for future work. how much you thinking?

[barwel1992]

about £60 + P&P

for 2 pistons 2 pins new the RRP is £119 each pistons and £13.97 each pin so rrp for both pistons and pins is £265.94

the pistons have 7k miles on them but will give you detailed pics when i get them (on the way from US of A)

[suzukigt380paul]

if you hone the bore 0.030mm does this not give you a bigger end gap on the rings thus giveing you more blowbye on the piston,and does useing a lighter piston put the crank out of balance,"just a thought"

[barwel1992]

if you hone the bore 0.030mm does this not give you a bigger end gap on the rings yes but not enough to worry about

thus giveing you more blowbye on the piston as above

and does useing a lighter piston put the crank out of balance once again yes but not enough to warrant the £200+ to have the crank balanced if i changed the rods then yes i would need balancing


:D