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04-26-2013, 03:15 PM | #1 |
Scooby Specialist
Member#: 223240
Join Date: Sep 2009
Vehicle:2006 WRX Silver |
Manley 99.50A and 99.50B Pistons
Hey guys my 06 WRX has been struck by the curse of the Subaru ring land failure. I have got a new STI shortblock from Subaru but I want to put a set of forged pistons in it. Manley has released their standard bore 99.50 pistons with Subaru A and B sizes. From my understanding these are suppose to be drop in's as long as you get the correct ones for what your block is stamped with. Ring gap has to be checked of course but, has anyone used these in a build? can anyone give an idea of what the PTW clearance was on them?
Thanks
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04-29-2013, 09:03 AM | #2 |
Scooby Newbie
Member#: 181995
Join Date: Jun 2008
Chapter/Region:
Tri-State
Location: Rome, NY
Vehicle:2003 WRX WRB |
I am going to be building my new block with these pistons. I'm letting my builder order the pistons, but my block has the "BBBB" code stamped on top. I was going to go with Manleys anyway, and then these were just released. Looks like a good match for someone like me with a brand new EJ257 case.
They are pretty new, and I haven't seen anyone on the forums who have actually used them yet. Unfortunately I won't be able to give you an option until later this summer, although my block will be done in 3 weeks. |
05-01-2013, 06:08 PM | #3 |
Former Vendor
Member#: 131945
Join Date: Nov 2006
Chapter/Region:
Tri-State
Location: Medford, NY
Vehicle:2013 BRZ Gunmetal |
They have not been released yet. We have just placed our opening order for this new model piston. We should be seeing them sometime next week.
To order you will need to specify how many A or B's you need than we will ship out accordingly. thanks Adam Last edited by No Limit Motorsport; 05-01-2013 at 06:20 PM. |
05-01-2013, 08:03 PM | #4 |
Scooby Newbie
Member#: 330175
Join Date: Aug 2012
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Just order my set of 4, "A"'s for No Limit Motorsports a few days ago. I called Manley and asked about these pistons. I was told the A and B pistons were the only true drop-in, no honing required. Their other standard bore 99.5 pistons still need to be checked for PTW clearance. Manley also recommended No Limit Motorsports as a place to order on the east coast. I went with them they were great to deal with.
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05-02-2013, 09:46 AM | #5 |
Former Vendor
Member#: 131945
Join Date: Nov 2006
Chapter/Region:
Tri-State
Location: Medford, NY
Vehicle:2013 BRZ Gunmetal |
Thanks cbazq271 for the kind words.
Here are the installation instructions for this new piston http://www.manleyperformance.com/dl/...structions.pdf |
05-12-2013, 09:05 AM | #6 |
Scooby Newbie
Member#: 353600
Join Date: Apr 2013
Location: Hampden,MA
Vehicle:2004 Wrx 2.5 35R |
Just to add to this. I was at the machine shop two days ago with my parts. My Manley 99.5 pistons that were purchased in October measured 99.49xxx. The 2010 EJ257 "b" block with 20k miles on it had very good cylinders with no abnormal wear. The ptw clearance were all between 0.0045-0.005. Being that I plan to track the car in the 450-500hp range this was considered to be ok in there eyes. I was also told to expect a rather noisy cold start which doesn't matter much to me.
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05-13-2013, 03:37 PM | #7 |
Former Vendor
Member#: 131945
Join Date: Nov 2006
Chapter/Region:
Tri-State
Location: Medford, NY
Vehicle:2013 BRZ Gunmetal |
We have received our shipment of these pistons. They look fantastic.
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05-13-2013, 09:33 PM | #8 |
Scooby Guru
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MWSOC
Location: In the V hole!
Vehicle:2015 Stock OEM AsFu* 3.6r OMG S.C'd |
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05-14-2013, 06:25 PM | #9 |
Former Vendor
Member#: 131945
Join Date: Nov 2006
Chapter/Region:
Tri-State
Location: Medford, NY
Vehicle:2013 BRZ Gunmetal |
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05-14-2013, 08:27 PM | #10 |
Scooby Specialist
Member#: 104098
Join Date: Jan 2006
Chapter/Region:
NWIC
Location: Eastern WA
Vehicle:97' LGT 2.3 Dstroke Rotated BW S256 6speed |
So if you get a new block and install these pistons, what PTW clearances are you supposed to end up with? Also are these 2618 alloy, or 4032. I'm curious as to how loud these will be for a nice daily?
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05-15-2013, 12:45 AM | #11 |
Scooby Specialist
Member#: 84105
Join Date: Mar 2005
Chapter/Region:
SCIC
Location: I'm a Newbie
Vehicle:2005 Super Slow STi CGM |
They are 2618. I haven't handled a set in person but I am sure they are aimed at a .003-.0035 PTW based on the corresponding sizes.
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05-15-2013, 09:01 AM | #12 |
Former Vendor
Member#: 131945
Join Date: Nov 2006
Chapter/Region:
Tri-State
Location: Medford, NY
Vehicle:2013 BRZ Gunmetal |
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05-15-2013, 01:20 PM | #13 |
Scooby Specialist
Member#: 127745
Join Date: Oct 2006
Chapter/Region:
NWIC
Location: CA
Vehicle:06 WRX 30r 6 speed 99L EJ255 6 Speed |
I think I will try a set on my next build
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05-23-2013, 05:21 PM | #14 |
Former Vendor
Member#: 131945
Join Date: Nov 2006
Chapter/Region:
Tri-State
Location: Medford, NY
Vehicle:2013 BRZ Gunmetal |
We've been getting some great feedback from customers building engines with these.
Adam |
05-23-2013, 07:49 PM | #15 |
Scooby Newbie
Member#: 300260
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Chapter/Region:
MWSOC
Location: Scottsville, KY
Vehicle:2002 WRX Rally Blue |
Guess I know what pistons to put in my shortblock next spring.
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05-24-2013, 12:14 AM | #16 |
Scooby Specialist
Member#: 239335
Join Date: Feb 2010
Chapter/Region:
W. Canada
Location: Edmonton, Alberta
Vehicle:2011 WRX WRB |
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05-24-2013, 10:06 AM | #17 |
Scooby Specialist
Member#: 191514
Join Date: Oct 2008
Chapter/Region:
NWIC
Location: teh bremerton
Vehicle:'05 FXT 6spd, 98 Fozzy lifted,'01 RS 6spd |
Guess it depends on how it measures out in terms of out of roundness and taper.
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05-24-2013, 10:33 AM | #18 |
Scooby Guru
Member#: 103232
Join Date: Dec 2005
Chapter/Region:
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Location: GTX3576R 05GD, GTX3076R'd FXT
Vehicle:GTX 3071R'd 11WRX PPG,4.44,LSD,E85,6spdx3 |
Anyone know if the standard 99.5mm pistons are slightly larger then the A, and B drop in pistons?
I assume yes, I just want to make sure... |
05-24-2013, 10:52 AM | #19 |
Scooby Specialist
Member#: 191514
Join Date: Oct 2008
Chapter/Region:
NWIC
Location: teh bremerton
Vehicle:'05 FXT 6spd, 98 Fozzy lifted,'01 RS 6spd |
A is 99.505-99.515
B is 99.495-99.505 |
05-24-2013, 11:04 AM | #20 |
Scooby Specialist
Member#: 84105
Join Date: Mar 2005
Chapter/Region:
SCIC
Location: I'm a Newbie
Vehicle:2005 Super Slow STi CGM |
I know the regular 99.5 pistons usually mic out to around 3.9140-3.9145"
Haven't measure any of these new A and B types. |
05-24-2013, 11:26 AM | #21 |
Scooby Specialist
Member#: 127745
Join Date: Oct 2006
Chapter/Region:
NWIC
Location: CA
Vehicle:06 WRX 30r 6 speed 99L EJ255 6 Speed |
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05-24-2013, 11:49 AM | #22 |
Scooby Specialist
Member#: 239335
Join Date: Feb 2010
Chapter/Region:
W. Canada
Location: Edmonton, Alberta
Vehicle:2011 WRX WRB |
No I was asking just out of curiosity, motor is still running strong in my car. But someone locally is selling a short that had a piston crack a ringland. Was considering buying it.
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05-24-2013, 11:51 AM | #23 |
Scooby Specialist
Member#: 84105
Join Date: Mar 2005
Chapter/Region:
SCIC
Location: I'm a Newbie
Vehicle:2005 Super Slow STi CGM |
Cracked ringland usually equals scoring. Go with the 99.55mm piston and you should be able to get a clean cylinder unless the scoring is bad.
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05-24-2013, 01:02 PM | #24 |
Scooby Specialist
Member#: 127745
Join Date: Oct 2006
Chapter/Region:
NWIC
Location: CA
Vehicle:06 WRX 30r 6 speed 99L EJ255 6 Speed |
Depends...my last block had scoring that was around .002-.003" which ruled out the 99.55mm pistons as the extra .002" they give you is generally used in your hone. And that is assuming a block that is not ovaled out too much.
Not disagreeing, just saying measure THEN buy Last edited by aboothman; 05-24-2013 at 01:11 PM. |
11-07-2013, 01:02 AM | #25 | |
Scooby Specialist
Member#: 104098
Join Date: Jan 2006
Chapter/Region:
NWIC
Location: Eastern WA
Vehicle:97' LGT 2.3 Dstroke Rotated BW S256 6speed |
Quote:
I've heard people say regular manley pistons are on the noisy side. |
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