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02-07-2013, 01:35 AM | #26 |
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02-23-2013, 11:09 PM | #27 | |
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Quote:
http://forums.nasioc.com/forums/show....php?t=2468791 and listed here on page 118 http://www.manleyperformance.com/dl/2013/pistons.pdf |
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02-24-2013, 11:02 AM | #28 |
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^^ I like that option
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02-24-2013, 01:56 PM | #29 |
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So can you buy the 99.55mm Manley piston and hone the bore to suit without using the boring bar first?
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02-24-2013, 02:01 PM | #30 |
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Location: medford nj 08055
Vehicle:5/01 bugeye Hakt Ecu is back! |
What about the sleeves being marked A or B from OEM?
those letters represent different sized pistons correct? Ots pistons are supposed to all be the same size out of the box right? So I can't see how people think drop ins are close enough. I know guys that buy engine components and assemble short blocks without taking a single measurement. Its been explained to me that its close enough... I'm like...WHAT?!? Dood even questioned my machine shop as to whether or not they are just taking my money and not doing anything but assembling the engines...even though I have video of my block on a line bore machine and the block under tq plates getting the sleeves honed. His ignorance is followed up with a stone ball hone on the other end of an electric drill for the sleeves to get hatching back. I'm like Dood...I've done that and burnt rings up stupid fast. Ball hone is too aggressive. What guys will do to make money on the backs of people who don't know better. Sorry, I have a conscience. And I don't think my machinist is ripping me off. PS my engine is still running.. Last edited by maxpowr; 02-24-2013 at 02:09 PM. |
02-24-2013, 02:49 PM | #31 |
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I have experienced the same thing. What can I say...stupid people do amazing things! I offered to loan a friend thousands of dollars of tools to take his time and build an engine right with a solid blueprint. He just threw it together and wonders why it sounds like it will come apart any minute. Didn't even mic the crank and verify the bearing tolerances!!
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02-24-2013, 04:50 PM | #32 |
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Karmas a bitch. I just try to do right by people.
Rookies beware. Just cause its put together doesn't make it right. |
02-24-2013, 06:23 PM | #33 |
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One reason why you ask for lots of pics or videos. And you recieve a build sheet with all specs.
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02-24-2013, 07:12 PM | #34 |
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i agree.
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02-24-2013, 08:57 PM | #35 |
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The difference between a A and B piston on a EJ205 is only .0007" max. So your PTW clearances might not all be the exact same but they could be well within a acceptable range. This is why some people get lucky honing and throwing in some Drop-ins and others have issues. Unless your measuring with quality tools your 100% rolling the dice. Thats why I'm I got my tools for X-mas
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02-24-2013, 10:40 PM | #36 |
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Join Date: Oct 2006
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Vehicle:06 WRX 30r 6 speed 99L EJ255 6 Speed |
That's also why it is AWESOME that Manley is putting forth the effort to ensure that drop ins have a better option than is currently available
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02-24-2013, 11:09 PM | #37 |
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I wonder why Subaru even bothered making them different if its only .0007...you certain about that?
How bout on a 255/257? |
02-24-2013, 11:34 PM | #38 |
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The total tolerance for OEM pistons is .0004" - .0012" MAX. That is .0008" FYI. The difference between the smallest A and largest B pistons is .0008" Not an official mathematician, but I am pretty sure that would leave a .0000" PTW if a large B piston was used in a small A hole. The FSM I have says A is big and B is small, but I am pretty sure it is all ****ed off.
Giggity |
02-24-2013, 11:36 PM | #39 |
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^+2 Its crazy how tight the factory PTW clearance is.
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02-25-2013, 12:32 AM | #40 |
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If I'm not mistaken my stock bore cosworths were set at .0015. I'll check the blueprint.
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02-25-2013, 06:48 AM | #41 | |
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Quote:
I find your statement kinda harsh with regards to ball honing. |
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02-25-2013, 07:37 AM | #42 |
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I guess if you have tools to measure what you are doing with a ball hone its not so hap-hazard.
I'm more referring to guys who place block on ground and reem the sleeve like a whore and assemble. I also feel that a drill press type of hone with cutting teeth can probably achieve a more uniform measurement. I'm into do it yourself, trust me, but some things should be done with proper tools and measurements. I am actually offended by the term close enough. |
02-25-2013, 08:00 AM | #43 |
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If I pay a machine shop to cut my block to certain spec shouldn't I expect to receive it like that? I don't want to come off cocky but this issue has been bothering me for years.
I'm not ignorant to how small .000x is... Maybe I am being hyper critical. Just burns me up to think I may be wasting thousands of dollars at a machine shop and I may have shot myself in the foot on the quest for exact tolerances...while people I know are spending little to nothing and making thousands. I've actually lost a close friendship of many years over this issue. I would admit I was wrong if I really believed you can assemble a used Subaru engine with off the shelf parts. Again...I'm not here to say I'm right...there's always more than one way to skin a cat. I just look at it like painting a wall with a fine brush and roller compared to throwing the gallon of paint at the wall. |
02-25-2013, 10:54 AM | #44 |
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Most decent shops will tell you that you need to double check their work when you take delivery or shortly after.
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02-25-2013, 10:58 AM | #45 | |||
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Quote:
Quote:
Quote:
Thats crazy!! Ive never had a shop say that but I wouldnt be upset cause Id be doing that anyway Last edited by Paul; 02-25-2013 at 11:10 AM. |
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02-25-2013, 12:14 PM | #46 |
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Hmmm...Im gonna feel differently at the machine shop today.
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02-25-2013, 09:42 PM | #47 |
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Ahh so thats why my old motor bit the ****. Improper everything and a machine shop employee collecting cash on the side doing half assed to nothing work.
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02-25-2013, 11:13 PM | #48 |
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11-19-2019, 07:42 PM | #49 |
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Vehicle:2005 2.5 SC OB |
"A" Cylinder Bore Size Range = 3.9175" - 3.9179"
"B" Cylinder Bore Size Range = 3.9171" - 3.9175" |
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