Piston's

[riverman]

I'm ready to take my engine apart and I'm sure it's going to need bored and honed . I have a local shop that does the the machine work and I have always used Wiseco prolites in my banshee's and other bikes with great results. I have read many post and most here perfer Vertex to Wiseco for the 500. But not much information why.
Why??????????

[AlisoBob]

Because they make more power, and dont scuff up like a siezeco.

[riverman]

How do they make more power? I have never had a wiseco sieze up.

[100hp honda]

ya bob, how do they make more power ?

only 1 reason guys dont like wiseco.......... because theyre too fuckin dumb to know how they work. . not meening bob in particular but people in general. half the blame goes to machines shops. alot of so called professionals out there that cant bore a hole to save their ass (gss is good example, but certainly not the only example), customer doesnt double check the work before assembly, half way down the driveway the damn thing is froze up. how is that a pistons fault ?? tell me that. seems me and Pstoffers the only mofos on the planet able to run wiseco for years on end with no siezures

[iggys-amsoil]

^^^
Like he said, its up to the mechinist and your knowledge to make sure the bore is done right.

If the bridge is reliefed right and the ports are chamfered properly should be no problems.

I have three years on this Wiseco and letting it go another year, however I haven't riden it much this year because of a broken arm.

Some just feel the cast pistons give them that warm fuzzie OEM feeling.

[100hp honda]

iggy said it well. round hole, round piston, enough clearance for expansion. why is everyone so stumped on that simple concept ??

[Rhino89523]

[seems me and Pstoffers the only mofos on the planet able to run wiseco for years on end with no siezures [/quote]

I run the shit out of them and they last me way longer than one should, I ride singletrack, sandwashes, sand dunes, hill climbs, I ride it fast, I ride it slow, I will ride basically anywhere, and Wiseco's run for me forever. Never siezed one, never cracked one...knock on wood. I just run them and steer clear of the argument most of the time because I don't really care...they work great for me and always have.

[AlisoBob]

Cast is much more size / temp stable, dosent rock around in the bore, scuff, or turn to shit.

The ring lands dont exapnd, so the rings seal better.

Cast dosent conduct heat as well, so more heat makes it to the rear wheel

Cast is better for 90% of all applications. (N20 being the big exception)

I wish someone whould make a hypereutectic piston for the 500.....

[100hp honda]

I'm ready to take my engine apart and I'm sure it's going to need bored and honed . I have a local shop that does the the machine work and I have always used Wiseco prolites in my banshee's and other bikes with great results. I have read many post and most here perfer Vertex to Wiseco for the 500. But not much information why.
Why??????????

put whatever in there you want. thats why.

next person brings up this topic get kick in the nutz by brit

[riverman]

Dam!!!!!!!!!!!
I thought there was a real reason not to run Wiseco. I guess it just like oil, my oil is better because that's what I run.

Thanks

[pstoffers]

Pornstars for life!!!

[100hp honda]

i posted this a while back. general terms between cast/forged.

http://www.bannedcr500riders.com/board/ ... hp?t=10315

specifically speaking about cast/forged on a cr500 they are both fine. alot of it is preference but there is some differences. cast is cheaper but wiseco told me they lowered their prices so im not sure how they compare now. aside from brits broke wiseco ive never seen one ever break or crack, not saying it aint ever happened but i dont recall seeing it. cast is notorious for cracking the intake side (tons of photos to support this, i had a cracked one myself), extra slop is most likely always the reason. not sure on the weight, cast version is probly lighter, not sure if its because the material used or the piston design. boat anchor wiseco is pretty heavy compared to earlier/later versions but honestly i dont have a problem with the wiseco weight.... except the boat anchor. wiseco does have a bad rap for seizing. bad machine work and operator error are the only reason i can think of. i see no way you could put any blame on the product. never had a problem with mine, alot of dudes never had problems with theirs. that sums it up i believe.

[AlisoBob]

...wiseco does have a bad rap for seizing. bad machine work and operator error are the only reason i can think of. i see no way you could put any blame on the product. .

Roosty told me they have had real ups and downs in quality control. 10 pistons will be 8 different sizes.

Thats one of my biggest gripes with Wiesco... Your paying more than "custom piston" prices, and their delivering junk.

$160 x 8 = $1280

Roosty, what does the finest set of Sprint Car pistons cost?

[100hp honda]

ive never checked 10 pistons so i cant say for sure. i do have 2 92mm here that i will check tomorow, probly wont tell us a damn thing in the big picture but ill measure. glen would be the man to ask becuase he always has 20 pistons on the shelf. problem is, if his micrometer is like his bore machine, the numbers would be all over the place . doesnt really matter if 10 pistons are 10 different sizes, you bore each hole to piston size.

[fastkart]

Roosty, what does the finest set of Sprint Car pistons cost?

Retail on a set of Mahle's is about $650 if I'm not mistaken.

[AlisoBob]

... if his micrometer is like his bore machine, the numbers would be all over the place

[100hp honda]

Roosty, what does the finest set of Sprint Car pistons cost?

Retail on a set of Mahle's is about $650 if I'm not mistaken.

buddy that got me the 92mm wiseco also has the 92mm mahle. just a hair over $300/each if i remeber right........ and thats his good buddy discount to me. probly around $375 for the average dude. got 2 wisecos but you can see why i kept the old mahles i pulled out. frikin things are like gold. seen old used one on ebay few days ago, cant remeber the price but im sure it was $100.

[AlisoBob]

....probly around $375 for the average dude.

Thank god I'm not the average dude.

[fastkart]

92mm would be a really small sprint car piston, too. Seems like 4.130 is a common bore size. I don't know though. My wallet isn't fast enough for a sprint car.

[100hp honda]

92mm would be a really small sprint car piston, too. Seems like 4.130 is a common bore size. I don't know though. My wallet isn't fast enough for a sprint car.

i was refering to the mahles manufactured for ktm. actually mahle doesnt have any say-so in what ktm charges. be interesting to see what those $300 pistons REALLY cost to make . frikin austrians sure know how to rip people off.

[other]

The difference in size between individual Wiseco pistons is no excuse for poor machining, as any machinist worth his salt will bore a barrel to suit the individual piston assigned to that bore. . . Only trouble Ive ever had with Wiseco's is 2 (out of probably 14 or 15 over the years ) have knocked out of round, and started chuffing oil mist (XR600 and TT350). Weird thing is, both elongated on the front-to-back axis . . . hard to explain.

[2T500]

i doesnt really matter if 10 pistons are 10 different sizes, you bore each hole to piston size.

run lots of weisco here and it really seems like you need to know the engine shop who do your bore job, had one one suzuki 250 some years ago and the bore job was bad, i measured it out of round and they paid for the last oversize weisco piston, i used a different co to do the bore at tight clearances and it lasted for a long time after very careful run in for work use not racing.., same with the 500, buy your piston and use a boring shop well recommended on this list with an initial clearance that suits the way your going to treat the engine during run in and more, .004" race run in still or .003" for very nicely and careful, a lot of that scuffing polishes off over time by itself if your not racing. YMV so far i still use weisco.

[Roostius_Maximus]

racetech are arround 850, je has to be somewhere in there too

[scooter5002]

Sorry for the hijack. Roost I sent you a pm. You get it?

[Roostius_Maximus]

dammn, i'll get to the computer. i'm sure its there but i can never reply from my phone for some reason.