I need to know where I can find some pistons. I called Wiseco and they said I'd have to know the wrist pin diameter and bore I wanted and try to use pistons from a different application.
That sounds like a great way to smash some valves, or end up with 14.9 to one compression.... (BOOM!)
Also cranks and rods would be nice.
I can't remember all the specs I need. And I would prefer to order something that isn't "Jury Rigged" to work...
lazy,
use the search feature just like everybody else
the 555 kit was put together by V&H several yrs ago
and are probably all gone.
it's all readily available parts....
If you have not figured it out by now....there are very little to no high performance parts (or even poser parts) made for the GS. There is no money to be made by this. What everyone uses now is their creativity to use other existing parts from other bikes and adapts them. Other than that, there is always custom fabrication.
This is going to be the closest to a "kit" that you will find from a manufacturer:
http://gstwins.com/gsboard/index.php?topic=14401.0
Their are very few bikes that use a 18mm wrist pin and have a piston larger than 74mm.
Ever think I might have already searched and been iffy with what I found? :cookoo: Needed more info, or even *GASP* a second opinion?
Aside from being abrasive you actually were helpful with the V&H ref. Turned up some more stuff.
Like using GPZ 78mm pistons. I already PM'd dgyver asking for info, but no response. (Of course not everyone is a forum whore like me....)
Still wondering about cranks and rods. I was hoping to find those with this little foray.
Anyways thanks for the V&H tidbit, actually helped. What I really need to know about now are rods and cranks.
And BTW dgyver posted while I was typing this and nullified the hell out of me....
Nice, thanx dgyver.
Know where I might find a crank of uberness, preferably made out of unobtanium?
No but really, a super tough crank and some rods would be nice.
And your 541 is still holding up well I presume?
(I know you talked about carbs for it, but could you go a little more in depth? I know with the many more hungry cc's having bigger carbs would be good.)
The 555cc pistons used in the V&H bike were from Wiseco according to the article in August 89 Cycle World. Their parts list shows Wiseco Piston Kit $199. Wiseco used to list them in their catalog but dropped them a few years ago. I looked them up in the Wiseco catalog myself years ago.
Some of us have a life outside of this place and have to work.
I spoke with Wiseco about 2 years ago and they said the 79mm pistons have not been made since 1992. No idea when they ran out of stock or removed the info from their catalog.
The 541 is in my track bike and has been sitting for awhile. I had to pull a cam to have it repaired but just recently installed a stock head and cams until I get it back. Longevity of a 541? ...do not know. Race bikes are only run hard 20 minutes at a time, several times a weekend which is much less than a street bike. So they are generally in better shape than street bikes. I may pull it and put in a second street bike if I get to the point of needing it, hopefully I will have the 650 motor ready instead. I have no problem running a bored bike on the street, but then I avoid traffic and only do mountain runs.
Carbs...I had a set of 34mm round slides on the 541 but sold them. Currently it has 36mm CV carbs, stock GSXR. They are the same as the GS but a larger bore. I have a set of 36mm flat slides but have not messed with setting them up. They will be used on the 650. Expect to pay $300 for a pair of flat slides. GSXR CV's will go for around $100-200 but are a set of 4.
As for rods, cranks, and cams...Carillo, Falicon, and Megacycle are the only ones I know of doing custom work, there probably are more.
most crank work is done on 4 cylinder or V-twin....hard to find anybody to do a P-twin
rods are not a weak point,
crank balance.....yes
counter balance bearings....yes
you will not get this engine to rev to 14k
also other trivia....the 555 kit was around in the early 80's for the GS400/425/450 based racebikes of the day
what do you want to do to your engine?
whatever it is....it would be cheaper to buy all of Lee's stuff and his knowlege will go with it.
as LEE stated.....you throw CUBIC DOLLARS AT IT TIL IT BURPS.....
or mad maxx..... speed's just a question of money, How fast do you want to go?
The GPZ pistons seem the most viable option for more displacement/higher compression. I am curious for someone to calculate the compression ratio using those pistons and a stock head though. I suppose I could spend the money to find out, but a guarantee that compression would be increased would be nice first.
Quote from: Chris_B on September 23, 2006, 07:36:20 PM
The GPZ pistons seem the most viable option for more displacement/higher compression. I am curious for someone to calculate the compression ratio using those pistons and a stock head though. I suppose I could spend the money to find out, but a guarantee that compression would be increased would be nice first.
Yes the compression is higher. What it is, I do not know. The dome of the piston fills the head cavity. I have a comparison pic of a 74, 75, 78 & 79mm piston. I can post it if needed.The 74 & 75 are spherical domes while the 78 & 79 are triangular domes. When I first put the 555 together, I was using a milled cylinder and milled head. The piston was hitting the spark plug. I had to grind a little off the piston for clearance. With a stock height cylinder, there was enough clearance.
Cannot do a stroked crank without increasing the cylinder height. The TDC of the piston is just a little below the top surface. Any higher the piston hits the head.
Compression ratio is easy to calculate, I don't feel like explaining it right now but the info is easy to find. Also It shouldn't be hard to adjust the compression my milling the deck of the cylinders to increase it or by shimming it up to decrease it.
dgyver, could you post that picture?
And I suppose the compression ratio would be easily calculated if you had numbers to work with, but how could you without knowing how much volume is displaced by the piston relative to the center of the wristpin, and having the same information for the stock piston?
http://img.photobucket.com/albums/v64/dgyver/GSmods/GSpistons01.jpg
http://img.photobucket.com/albums/v64/dgyver/GSmods/GSpistons02.jpg
http://img.photobucket.com/albums/v64/dgyver/GSmods/GSpistons03.jpg
http://img.photobucket.com/albums/v64/dgyver/GSmods/GSpistons04.jpg
just have a set custom made by a piston manufacturer
of course they wont make less than twenty
like ken said just buy my stuff! :icon_rolleyes:
What do you have and what do you want for it?
Thanks for the pics by the way.
http://gstwins.com/gsboard/index.php?topic=28804.0
Quote from: onefastgs500 on September 25, 2006, 05:13:42 AM
just have a set custom made by a piston manufacturer
of course they wont make less than twenty
like ken said just buy my stuff! :icon_rolleyes:
I PM'd you about your spares.
I can't afford the whole bike. (And I'm too attached to mine to get rid of it.)
circles you buy my bike and you will throw rocks at yours! :icon_mrgreen:
Haha, never happening with the throwing rocks.
I beat a Busa up our local stretch of twisties, I don't need anything else.
Jenna and I are UBER!
not to bust your bubble...(well,yeah to bust your bubble)
you could beat a bust on the twisties riding a bicycle
Quote from: werase643 on September 26, 2006, 06:07:08 AM
not to bust your bubble...(well,yeah to bust your bubble)
you could beat a bust on the twisties riding a bicycle
You mean a Busa? Cause I didn't know anyone made a bike called a Bust....
Yeah you could, but you would have to be going down hill.
No thread on this site can escape going off-topic. It seems.
Those GPZ pistons do look like they'd fill the combustion chamber a good bit better than the stockers.
Sorry to bring back an old thread..but does anybody know offhand what the compression ratio was using the Vance & Hines pistons?