V-Strom engine in an SV frame.

[SoulKiss]

Was looking through Wikipedia (trying to remember the model designation of the V-Strom, thinking of putting its Handguards on my Z750).

Saw this

Originally Posted by Wikipedia

Mechanicals

A six-speed transmission mates to the fuel-injected and slightly retuned 645 cc engine from Suzuki's SV650 sport bike, using a two-into-one exhaust system.[9] An upright, standard riding posture contributes to the bike's handling characteristics.
Engine The engine is a 90-degree, liquid cooled, four-stroke V-twin, with 81.0 mm (3.19 in) bore and a 62.6 mm (2.46 in) stroke, four valves per cylinder, and intake and exhaust valving each with their own camshaft. Its more relaxed cam profiles (than the SV engine) boost the power between 4,000 and 6,500 rpm, along with slight changes to the airbox and exhaust. Relative to the SV, the crank inertia (flywheel effect) is also increased by 4% via a redesigned starter clutch.[10] As well, the DL650 engine uses a plastic outer clutch cover and engine sprocket cover for reduced weight and noise.[10]
Unlike the SV engine, which uses cast iron cylinder sleeves, the DL650 uses Suzuki's proprietary SCEM (Suzuki Composite Electro-chemical Material) plated cylinders, a race-proven nickel-phosphorus-silicon-carbide coating for reduced weight and improved heat transfer, allowing for tighter and more efficient piston-to-cylinder clearance[10], similar to a Nikasil coating.

Now if I read that correctly, the V-Strom engine might be superior to the SV version, as is lighter.


Anyone have any thoughts on this - any racers care to say why they don't swap one in instead of an SV one, swapping the cams over as well if that power boost is not needed?

[andrewsmith]

Sounds a bit like bum gravy.

The engine is tweaked for midrange, and the nikasil will be refering to the current new/ one as it is the Gladius motor which has coated barrels and a crude slipper clutch of sorts (injects extra fuel in on the overrun to reduce the engine braking)

Originally Posted by andrewsmith

Sounds a bit like bum gravy.

The engine is tweaked for midrange, and the nikasil will be refering to the current new/ one as it is the Gladius motor which has coated barrels and a crude slipper clutch of sorts (injects extra fuel in on the overrun to reduce the engine braking)

so do the new sv's still have the old cast iron liners while the v-strom & dl
use nikersil or what ever, cylinders

[yorkie_chris]

Originally Posted by SoulKiss

Now if I read that correctly, the V-Strom engine might be superior to the SV version, as is lighter.


Anyone have any thoughts on this - any racers care to say why they don't swap one in instead of an SV one, swapping the cams over as well if that power boost is not needed?

Not legal in minitwins

Not heard of anyone against cast iron liners TBH, nikasil is just bloody expensive when you need a rebore.

Originally Posted by yorkie_chris

Not legal in minitwins

Not heard of anyone against cast iron liners TBH, nikasil is just bloody expensive when you need a rebore.

you dont rebore nikasil but all thing being equal you shouldn't ever need to as they should out last the bike,the stuff they put on the vfr800 aint called nikasil but it work the same and they recon it is good for 500k + as it is so hard it will never ware up. husqvarna use nikasil on there chain saws and its good for 500 hours use minimum,and thats only a 2 stroke chainsaw

[andrewsmith]

Originally Posted by suzukigt380paul

so do the new sv's still have the old cast iron liners while the v-strom & dl
use nikersil or what ever, cylinders

Yep still the old CI liners

As YC has said it wouldn't be legal, as the question was asked when the Gladius was launched.

Chris it thought Nikasil couldn't be rebored?

[squirrel_hunter]

So is the V-Strom cylinders superior to the SV cylinder due to the Nikasil?

[Sid Squid]

Originally Posted by andrewsmith

thought Nikasil couldn't be rebored?

It can't but that's because there's nothing to rebore, it isn't a liner it's a plating, (like chrome), which is necessarily only a fraction of a millimetre thick, if it's worn the cylinder is replated rather than rebored. Typically there's no liner at all - the plating is applied directly to the aluminiumof the barrel.

[andrewsmith]

Originally Posted by Sid Squid

It can't but that's because there's nothing to rebore, it isn't a liner it's a plating, (like chrome), which is necessarily only a fraction of a millimetre thick, if it's worn the cylinder is replated rather than rebored. Typically there's no liner at all - the plating is applied directly to the aluminiumof the barrel.

Thought so
So not a cheap fix

[Sid Squid]

I've never actually paid for one myself so I don't know for certain, but as I understand it a replate is about £100-£120. So no, not a cheap fix - but they last well, so by the time it needs doing the extra cost of plated bores against a rebore, probably won't really be noticable when the rest of the motor needs fixing too.