11882 ultra stroke wiseco pistons, option for +4mm stroker?
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11882 ultra stroke wiseco pistons, option for +4mm stroker?
Been looking at options for a +4mm stroke crank to use with 31k cylinders. From research i thought the non base spacer option piston was the 795 wiseco with raised wrist pin. I found these 11882 ultra stroke pistons listed. from the sellers description this may be an option ?? different piston crown angle of 13 degrees?? anyone here used this option?
https://www.ebay.com.au/itm/2-x-Wiseco- ... 1333124157
This is seller description
Introducing ULTRA STROKER pistons from Wiseco designed by engine builders with 20 plus years in the industry
One of the definitive ways to get more power from your Banshee is by increasing the stroke of the engine.
This is a pair of BRAND NEW Wiseco forged ULTRA STROKER pistons.
These pistons are custom made by Wiseco (part number 11882)
They allow you to run a 4mm stroke long rod crank (58mm stroke 115mm rod) –
The stock banshee head will require a .060” base gasket to work properly. I also offer the .060” base gasket as well.
Availability is 64.00, 64.50, 65.00, 65.50, and 66.00mm sizes for your cylinders
These are Wiseco forged pistons that takes all the good features to make much more power than Blaster pistons:
- The piston domes are 13 degrees - so you can run a stock banshee head (must use the .060 base gasket)
- a Blaster 573 piston has 9 degrees, so the squish is not optimal when using a stock Banshee head.
- 6mm pin offset location - compensated for the increased stroke and rod length
1. The raised intake windows allow the piston windows to be fully open at BDC. (Unlike the blaster piston, in which they are mostly closed at BDC) - Please see the last auction photo for a visual between an ULTRA piston (left) and a BLASTER piston (right)
Why use ULTRA STROKER PISTONS?
You have a stock bore banshee, and you don't want to bore it .080”over to the last bore just to run Blaster pistons (Blasters are 66.00mm or larger)
You don't have to re-cut 9 degree Blaster dome for your Cool Head or re-cut your stock head (we also sell 13 degree ultra stroker domes that are bolt on - the only modification with a Pro Design Cool Head is our custom CNC cut dome and using a .020” base gasket instead)
You don't want to run a spacer plate, the transfer timing will be out of specifications, above 135 crank angle degree.
https://www.ebay.com.au/itm/2-x-Wiseco- ... 1333124157
This is seller description
Introducing ULTRA STROKER pistons from Wiseco designed by engine builders with 20 plus years in the industry
One of the definitive ways to get more power from your Banshee is by increasing the stroke of the engine.
This is a pair of BRAND NEW Wiseco forged ULTRA STROKER pistons.
These pistons are custom made by Wiseco (part number 11882)
They allow you to run a 4mm stroke long rod crank (58mm stroke 115mm rod) –
The stock banshee head will require a .060” base gasket to work properly. I also offer the .060” base gasket as well.
Availability is 64.00, 64.50, 65.00, 65.50, and 66.00mm sizes for your cylinders
These are Wiseco forged pistons that takes all the good features to make much more power than Blaster pistons:
- The piston domes are 13 degrees - so you can run a stock banshee head (must use the .060 base gasket)
- a Blaster 573 piston has 9 degrees, so the squish is not optimal when using a stock Banshee head.
- 6mm pin offset location - compensated for the increased stroke and rod length
1. The raised intake windows allow the piston windows to be fully open at BDC. (Unlike the blaster piston, in which they are mostly closed at BDC) - Please see the last auction photo for a visual between an ULTRA piston (left) and a BLASTER piston (right)
Why use ULTRA STROKER PISTONS?
You have a stock bore banshee, and you don't want to bore it .080”over to the last bore just to run Blaster pistons (Blasters are 66.00mm or larger)
You don't have to re-cut 9 degree Blaster dome for your Cool Head or re-cut your stock head (we also sell 13 degree ultra stroker domes that are bolt on - the only modification with a Pro Design Cool Head is our custom CNC cut dome and using a .020” base gasket instead)
You don't want to run a spacer plate, the transfer timing will be out of specifications, above 135 crank angle degree.
yamaha fanatic.
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Re: 11882 ultra stroke wiseco pistons, option for +4mm stroker?
Interesting..never heard of that until I read your post
Banshee (Baja) race bike,+ 2 A Arms,L.E.Ds, Toomey, +4 stroker IMS tank, run flats.
96 GSXR SRAD, Future Yoshimura rep.
85 custom Tri-Z
RZ/YZR bike(project)
86 VFR750 RC24 Merkel replica (project)
Royal Enfield Bullet 500
96 GSXR SRAD, Future Yoshimura rep.
85 custom Tri-Z
RZ/YZR bike(project)
86 VFR750 RC24 Merkel replica (project)
Royal Enfield Bullet 500
Re: 11882 ultra stroke wiseco pistons, option for +4mm stroker?
Nor me, sounds good from what you out up, interested to hear from someone whos used them now.
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82 RD250LC JDM '251LC' YPVS
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81 RD350LC Resto
82 RD421LC Hybrid
82 RD350LC decapitation project
82 RD250LC JDM '251LC' YPVS
83 RZ350 Resto
84 RZ500 Resto
85 RZ350 F1 Resto
86 RZ350 F2 Resto
86 RZ350 F2 Hybrid
Like Watches? www.PloProf.com & www.DeskDivers.com
Re: 11882 ultra stroke wiseco pistons, option for +4mm stroker?
Now if only there was a substantial amount of airflow at BDC.......
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Re: 11882 ultra stroke wiseco pistons, option for +4mm stroker?
From a bit more research the 11882 piston has a 6mm offset pin like a blaster piston but is made in smaller sizes. Ie 64mm up compared to the blaster that starts at 66mm oversize. The 795 piston has a 5mm offset which protude an extra 1mm into head. Maybe this 11882 piston is closer to a plug and play with +4mm stroke crank with the long rod then the other options. Cylinders and head would still need work for optimal results.
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yamaha fanatic.
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Re: 11882 ultra stroke wiseco pistons, option for +4mm stroker?
Care to dive a little deeper Ed? Any relief for that?
There is only one difference between a madman and me. The madman thinks he is sane. I know I am mad.
Salvador Dali
Salvador Dali
Re: 11882 ultra stroke wiseco pistons, option for +4mm stroker?
I was lucky enough to have a group of world class tuners help me design the pistons for my RD250 LSR bike, I can be a pain in the ass because I question everything trying to find every last bit of advantage, in the beginning there were some certain ideas about when the most airflow was needed but in the end the engine simulations showed us this:
1)Starting at BDC the piston rises 30deg to 210deg or rises 2.786mm and intake flow starts
2)intake flow peaks at 315deg or 45deg before TDC or 9.578mm before TDC
3)From there intake flow tapers off as the pistons passes TDC and ends at 45deg ATDC or 9.578mm down from TDC
Now good pipe dynamics can stretch things a bit but there is not much airflow going on at BDC... so... if you set the windows higher to be open at BDC then the skirt actually starts to close the intake as it rises when you really want it open... basically you want to get the skirt out of the way as quickly as possible and keep it out of the way as long as you can... except at BDC when not much airflow is going on.. just sayin..
1)Starting at BDC the piston rises 30deg to 210deg or rises 2.786mm and intake flow starts
2)intake flow peaks at 315deg or 45deg before TDC or 9.578mm before TDC
3)From there intake flow tapers off as the pistons passes TDC and ends at 45deg ATDC or 9.578mm down from TDC
Now good pipe dynamics can stretch things a bit but there is not much airflow going on at BDC... so... if you set the windows higher to be open at BDC then the skirt actually starts to close the intake as it rises when you really want it open... basically you want to get the skirt out of the way as quickly as possible and keep it out of the way as long as you can... except at BDC when not much airflow is going on.. just sayin..
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Re: 11882 ultra stroke wiseco pistons, option for +4mm stroker?
Thank you.
There is only one difference between a madman and me. The madman thinks he is sane. I know I am mad.
Salvador Dali
Salvador Dali
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Re: 11882 ultra stroke wiseco pistons, option for +4mm stroker?
Question, does this data transfer the same or closey from the cylinder/piston design of the 70sAC RD250 to a next generation 1980s
YVPS 350 cylinder/piston design ?
Or is the initial claims of the aforementioned piston design for the YPVS/Banshee possibly have some validity?
Just asking
Thanks for any insight, merry XMAS by the way.
YVPS 350 cylinder/piston design ?
Or is the initial claims of the aforementioned piston design for the YPVS/Banshee possibly have some validity?
Just asking
Thanks for any insight, merry XMAS by the way.
Banshee (Baja) race bike,+ 2 A Arms,L.E.Ds, Toomey, +4 stroker IMS tank, run flats.
96 GSXR SRAD, Future Yoshimura rep.
85 custom Tri-Z
RZ/YZR bike(project)
86 VFR750 RC24 Merkel replica (project)
Royal Enfield Bullet 500
96 GSXR SRAD, Future Yoshimura rep.
85 custom Tri-Z
RZ/YZR bike(project)
86 VFR750 RC24 Merkel replica (project)
Royal Enfield Bullet 500
Re: 11882 ultra stroke wiseco pistons, option for +4mm stroker?
How you should phrase that is "does the data from one cylinder reed engine transfer over to another of similar design?" An engine doesn't care what year it was made thank goodness or my "70's aircooled RD250" wouldn't be making the hp it does lol!!! To answer your question there just isn't or almost isn't any intake airflow at bdc...
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Re: 11882 ultra stroke wiseco pistons, option for +4mm stroker?
Then why put the ports there. Was your 1970's tuned 250 running a +4mm long rod stroker crank. If it was where did the pistin windows end up?
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yamaha fanatic.
Re: 11882 ultra stroke wiseco pistons, option for +4mm stroker?
The stroke of the crank is not the issue. The issue is that regardless of crankshaft stroke there is little or no intake airflow at bdc of a two stroke engine.
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- Questo vecchio rz
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Re: 11882 ultra stroke wiseco pistons, option for +4mm stroker?
Interesting.....That's the kind of response I was hoping for ,as I was curious of your opinion of it it we're "all" 2 stroke engines or just "various incarnations".
I'm no engine designer/engineer, but as you, I enjoy and learn by questioning everything... so that I make a decision based upon what factual/ definitive information I learn from others. I enjoy the bench racing and watching ideas on paper pan out in real world results. I can add this to my engine notebook for funday reasearch
Thanks