NEW WISECO #871m0****

http://www.youtube.com/user/500bigbore · Post by **Roostius_Maximus** » August 24th, 2010, 4:51 pm

I talked with John at Mahle Motorsports today, they have no way of producing 2 stroke pistons again

blownbillybob · Post by **blownbillybob** » August 25th, 2010, 2:52 pm

100hp honda wrote:looks cool . not sure i like the skirt coating though. once it wears you got atleast .0015-.002" extra slop in there, .

When you bore a cylinder with a coated piston you don't compensate for the coating,so if your coating is plus.002 you don't add plus .002 to the cylinder, on the speedpro piston for the v8 engines they give you a finish size for the cylinder and when you mic it out you only have like .0005 clearance but they also tell you don't compensate for the coating because when it does wear down it will be to much clearance

100hp honda · Post by **100hp honda** » August 25th, 2010, 4:59 pm

have to allow for the coating. have to. MIGHT get away with it on the sloppy honda/wiseco clearances but on other bikes youll be locked up faster than brit on a budweiser. ktm for instance says .002 right in the book, thats with bare piston. your coating is going to be damn near .002, thats with minimum coating thickness applied. youll be running zero clearance with your method. like i said, it may fly with the slop wiseco calls for but it aint happening with a ktm mahle.

100hp honda · Post by **100hp honda** » August 25th, 2010, 5:31 pm

i can give another example where you would really be fucked by not allowing for coat thickness. many ktm bikes run less than .002. so you get the cylinder plated to a bare slug at .00019, now you send it off to swaintech for minimum coat. let me remind you swaintech has no way of accurately gauging how much the minimum will be. they say it should be "around" .00085. but they will tell you on the phone just like they told me, it could be more like .001. again, they have no way to accurately apply the coating, what it is, is what it is. so back to the story, you got your jug with bare piston sitting at .0019, because we didnt allow for any coating, now your slug comes back from swain and lets just say for example it does infact have .00085, thats .0017 all together. now you have .0002 piston clearance, not gonna fly. lets assume the piston comes back from swain at .001, thats .002 total..... you had .0019 originally on the the jug and piston before coating, now your .0001 too big, piston wont even go in the fuggin hole

. on the other hand, you put a wiseco in a iron cr500 sleeve at .004, you may be alright not allowing for the coating. depends on the situation i suppose.

2strokeforever · Post by **2strokeforever** » August 25th, 2010, 5:55 pm

i can give another example where you would really be fucked by not allowing for coat thickness

have you ever heard of "race clearanceing" ?

blownbillybob · Post by **blownbillybob** » August 25th, 2010, 10:54 pm

Well I guess someone should tell speedpro that there clearance for there pistons is wrong!!!!!!

Swaintech has different coatings one of them is to build up the skirt on lose pistons and does not wear off very easily and the others are a softer Molly so depending on what coating you use you could have a seize but I doubt that they would put a coating like that on a new piston unless it was for top fuel

I haven't seen the new wiescos up close yet but they look the same as the speedpros coating which ibelieve is a soft one and is going to wipe off before it seizes

The coating is put on with a machine kind of like a silkscreening t-shirts

seanmx57 · Post by **seanmx57** » August 26th, 2010, 4:57 am

I had swaintech strip the vertex moly coating and put PC9 on. The thick coat is the same stuff, PC9 just thicker. The coating process for the thicker application is not able to keep the thickness precise, it varies around .002 so it's really not a great fix for loose stuff but the race clearance method will remove high spots

These pics are from a new motor with a vertex set up at .003 measuring off the coating not the piston. It was running on 927 and had a coolant leak. It was running evan NPG-R and was hot enough so it was pinging and steaming the NPG-R out of the overflow. It Didn't seize or loose compression. The single ring got quite a bit of wear and the new nikasil bore got scored up. At the time I noticed the steam a riding buddy was on the bike and I noticed the steam and called it a day.

glen howell · Post by **glen howell** » August 26th, 2010, 10:23 am

maddog1927 · Post by **maddog1927** » August 26th, 2010, 2:15 pm

I need to pick up 2ea. 91mm's. Who has the best price?

Post by **AlisoBob** » August 26th, 2010, 2:53 pm

$290 each? X 8 = $2320 for a V-8?

I think Wiseco has lost their mind...

CP's are $700 a set for a SBC V-8

Custom CP's arent thet much more.... its all everyone I know runs.

Wisco's new plating must be made of gold.....

http://www.summitracing.com/parts/UEM-3210H-5MM

I wish Silvolite made CR500 pistons..... $32 EACH!!! Thats about what a dirtbike piston should cost.

http://www.youtube.com/user/500bigbore · Post by **Roostius_Maximus** » August 26th, 2010, 3:20 pm

too bad the silvolite, keith black and icon pistons are made in mexico and china

Post by **AlisoBob** » August 26th, 2010, 3:29 pm

I dont care if they are made on the Moon!!!

http://www.youtube.com/user/500bigbore · Post by **Roostius_Maximus** » August 26th, 2010, 3:34 pm

we use a pile of keith black series

Post by **AlisoBob** » August 26th, 2010, 3:37 pm

I realize that the Wiesco price is " List".... but thats still pretty friggin' expensive.

I bought a Vertex about 3 seconds ago for $114.

Still a ream, but what are you gonna' do??

dannygraves · Post by **dannygraves** » August 26th, 2010, 3:56 pm

CPs for my stealth were like $1200/set its all abotu the application and how many they will produce.
I used a set of silv-o-lites in my first starion motor, shattered the #3 piston 1-2 ring land into dust doing a hard pull, replaced with wisecos and never looked back.

M.F.D.B. · Post by **M.F.D.B.** » August 26th, 2010, 5:20 pm

dannygraves wrote: its all about the application and how many they will produce...

blownbillybob · Post by **blownbillybob** » August 27th, 2010, 10:30 am

I've heard cp is having alot of in house problems lately and has put out some product that was faulty

I got a set of blower pistons for the new hemi and they had .010 clearance at finish bore size had to wait another 4 weeks for a replacement set

Oh yea they were $1300.00 too

glen howell · Post by **glen howell** » August 27th, 2010, 10:44 am

kdizzle · Post by **kdizzle** » August 27th, 2010, 11:20 am

Thanks Glen I appreciate it!

bearorso · Post by **bearorso** » August 28th, 2010, 2:03 am

Glen,

Thanks for posting the Triumph pictures!

Have you more? Especially the engine?

I see a RH gear lever, so it's pre 75(? not really sure on that - what year did the US mandate LH gear change?) . So it's got some years on it it.

1080cc - on that stuff. Be still my beating heart!

What sort of power / torque does it have?

I'm a bit of a Brit Twin fan, no matter what it is.

Bear

dubious01 · Post by **dubious01** » August 30th, 2010, 5:39 pm

I agree Bob, those prices are retarded.

Custom zx14 JE turbo pistons made to my specs are $750 for 4 including $18 each for skirt dry film, and thermal dome coatings. 2 stage process. No rings included

CP custom zx14 turbo pistons, $820 for 4. no rings included

MTC custom zx14 turbo pistons, $560 for 4, includes rings, tool steel wrist pins and, c clips

Guys swear by the tolerances the CP alloys can maintain... .0015 piston to wall clearances on naturally aspirated motors!

dubious01 · Post by **dubious01** » September 5th, 2010, 12:19 pm

So,
can anyone divulge dimensions, like intake window width and diameter, exhaust face width compared to the old pistons?

That would be great information to share.
Adam, if you have this info I will buy a couple pistons off of you.

Tearing down 2 motors today, deciding what I will need, and putting out order for pistons on tuesday.

Thanks,
Lyle

Post by **AlisoBob** » September 5th, 2010, 12:28 pm

dubious01 wrote: Tearing down 2 motors today, deciding what I will need, and putting out order for pistons on tuesday.

http://www.youtube.com/user/500bigbore · September 5th, 2010, 2:49 pm

Lyle, i think i posted that earlier in this thread, weights, exh width, intake width, pin length.

dubious01 · Post by **dubious01** » September 5th, 2010, 4:43 pm

Thanks for the info on the old ones, but I didn't see any dimensions for the new 871MO....

I would do a cast piston, but I intend to cut a window, and open up the intake side of the skirt a little bit...at least on one of these motors.

.... personally I haven't ever had any issues with wiseco except once I leaned one out and burned a piston up, and it hot seized above the exhaust bridge. The bore was 90 mm with .003 " piston to wall clearance.
I rebuilt it to .004 clearance and new piston and ran it like a raped ape.

It was my own fault, I had new motor configuration, and bored out carb.
I went up to a 188 main, but in the end it needed a 192.
It ran fine going down the 5deg grade for 2 miles (low load), but pinged on the way up at part throttle, so I gave it some main jet and that made it even worse.

I would have shut it down but the cops weren't far behind... in town.

BannedCR500Riders.com

NEW WISECO #871m0****