De-sleeve an Sv???

[GixerJockey]

Can someone explain why you would want to de-sleeve an Sv650 race motor down to a 599cc?

I saw a built motor for sale and it has been sleeved down to a 599cc. This baffles me. Unless you need to do it to make it fit into some specific class... Otherwise I don't see the benefit of smaller displacement.

[CEO]

Someone correct me if I'm wrong on and of this.

First of all, you've mixed up your terminology a few times.

De-sleeving would be removing the sleeves from a sleeved motor, thus increasing it's displacement. Sleeving a motor decreases it's displacement.


Sleeving a motor often involves inserting a tougher metal sleeve into a lighter metal motor. With the stronger sleeves your displacement is decreased, but it allows you to run higher compression (for N/A) or higher boost (F/I)

It is often used in turbo applications (1999-2004 audi S4 is an example IIRC)



maybe i am confusing this with something else though

[BLACK SQUIRREL]

They use the motors to run smaller and sportsman classes In wera and maybe other race organizations

[daviid]

They use the motors to run smaller and sportsman classes In wera and maybe other race organizations

ding ding

[McBiggity]

Alot of western coast guys run SV's detuned to meet regulations. Noel, just run your SV and learn. You'll be amazed about the difference between trackdays and racing

[obsolete]

Someone correct me if I'm wrong on and of this.

First of all, you've mixed up your terminology a few times.

De-sleeving would be removing the sleeves from a sleeved motor, thus increasing it's displacement. Sleeving a motor decreases it's displacement.


Sleeving a motor often involves inserting a tougher metal sleeve into a lighter metal motor. With the stronger sleeves your displacement is decreased, but it allows you to run higher compression (for N/A) or higher boost (F/I)

It is often used in turbo applications (1999-2004 audi S4 is an example IIRC)



maybe i am confusing this with something else though

Desleeving would only refer to the removal of an old sleeve regardless of displacement. If you desleeve a motor it must be subsequently resleeved. The new sleeve could be of greater or lesser bore size.

Most new motors are made of aluminum which cannot take the stress. Therefore a steel sleeve is inserted into the block as the bore. This is also used on iron blocks in the case of massive bore damage. Sleeving has no effect on bore size unless you want to change it.

[OreoGaborio]

[Ryno]

There was a good article in Roadracing world a while back about Twinworks using parts from Japan spec SV 400 motors to make smaller displacements.
The one in particular they looked at was raced at willow. Some 500cc class I think

[Uncle Snake]

I'd say that Pete wins!

[GixerJockey]

Alot of western coast guys run SV's detuned to meet regulations. Noel, just run your SV and learn. You'll be amazed about the difference between trackdays and racing

Oh trust me. I wasn't considering buying it. My SV is just fine the way it is.

[CEO]

Desleeving would only refer to the removal of an old sleeve regardless of displacement. If you desleeve a motor it must be subsequently resleeved. The new sleeve could be of greater or lesser bore size.

Most new motors are made of aluminum which cannot take the stress. Therefore a steel sleeve is inserted into the block as the bore. This is also used on iron blocks in the case of massive bore damage. Sleeving has no effect on bore size unless you want to change it.

Gotcha. Thanks for the info.... didn't realize most newer motors were already sleeved.

[obsolete]

Yea, anything with an aluminum block will be sleeved.

Here's a cool article about an iron block being sleeved after the cylinder was ventilated. http://www.popularhotrodding.com/eng...ing/index.html

[eboos]

There was a good article in Roadracing world a while back about Twinworks using parts from Japan spec SV 400 motors to make smaller displacements.
The one in particular they looked at was raced at willow. Some 500cc class I think

I have that issue around somewhere, but the long and the short if it was they used the SV400 crank which was a shorter stroke and had custom rods made.

You should be warned, CCS and LRRS do not allow decreasing displacement to fit in lighterweight classes.

Dude, the issue was actually siting right here on my desk. Stand by for update. It was the March 2007 issue.

Update: the rod length went up to 5.029" from the stock 4.744". They used stock cylinders, pistons, heads and everything.

[RandyO]

Yea, anything with an aluminum block will be sleeved.

Here's a cool article about an iron block being sleeved after the cylinder was ventilated. http://www.popularhotrodding.com/eng...ing/index.html

no, a lot of surface treated aluminum, for instance once difference between the SV650 and V-strom 650, the SV is sleeved, the Strom isn't, it's got a electrochemical coating some secret suzuki recipe called SECM, similar to nikisil I guess

lotta dirtbikes use it

[obsolete]

no, a lot of surface treated aluminum, for instance once difference between the SV650 and V-strom 650, the SV is sleeved, the Strom isn't, it's got a electrochemical coating some secret suzuki recipe called SECM, similar to nikisil I guess

lotta dirtbikes use it

Really? I didn't think it would take it. Learn new stuff everyday.

[GixerJockey]

no, a lot of surface treated aluminum, for instance once difference between the SV650 and V-strom 650, the SV is sleeved, the Strom isn't, it's got a electrochemical coating some secret suzuki recipe called SECM, similar to nikisil I guess

lotta dirtbikes use it

Psssttt... It's nikisil...

[Ryno]

no, a lot of surface treated aluminum, for instance once difference between the SV650 and V-strom 650, the SV is sleeved, the Strom isn't, it's got a electrochemical coating some secret suzuki recipe called SECM, similar to nikisil I guess

lotta dirtbikes use it

Yeah most modern sport bikes are not sleeved. I know early on Nikisil was the main one, but I think there plenty out there now

[RandyO]

Chevy made a bad attempt at treated aluminum blocks in the early 70's with the chevy vega

[beet]

I liked the vagas

[Paul_E_D]

Yeah, but the term "de-sleeving" refers to reducing the ccs. That is all.

[brady]

I liked the vagas

My Vega ran just great with 2 different heat ranges of plugs and 1.5 quarts of oil for every tank of gas. You had to keep the windows rolled up at stop lights so it wouldn't fill up with blue smoke (some still came in through the floorboards). I still wonder sometimes how it got by with a two speed automatic transmission.

My Dad made me sell it after he drove it for the first time, said it was a "deathtrap". My next car was a Chevette . Put an amazing stereo in it that made me forget I was driving another crapwagon for four years. Best car I ever drove in the snow, though, tracked like a sled with skinny runners, and no power to break it loose even though it was rwd.

The 5.0 Mustang (4.9 really, but no one will ever admit it) that I got next tapped into a whole new part of my brain, a good thing it came a while later.



Some one said "Vega" (OK, vaga), not my fault...what was this thread about?

[RandyO]

My Vega

well, mine actually wasn't bad engine wise. but I swapped the tiny radiator for one out of a Nova, put over 100k on mine when the rear suspension began disintigrating, took engine out and used it to replace the one in my sister's Vega that had characteristics of yours

My dad's company decided to economise and replaced his Impala company car with a Chevette diesel, auto trans & air conditioning , I think it could do the quarter mile in 45-50 seconds