| [ Total Views: 1575 | Total Replies: 8 | Thread Id: 76744 ] |
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 eraser
Fahrvergnugen
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| posted on May 23rd, 2009 at 12:13 PM |
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New pistons Mahle, chinese, AA?
I have been looking around for a new set of pistons/barrels etc.
I keep coming to Mahle stock 1600CC which looks good.
But i also keep reading you cant seem to get propper forged pistons and only castones.
Along my journey i also found 1641cc set and a 1680cc set that just slip in, both of those were AA Products.
How do these alip in without any machining? and b do they noticibly increase the power?
I need a new set eitherway but just unsure to go the 1680 1641 or the 1600.
(its for a 1500cc case that has been converted to 1600 dp back in the day)
thanks in advance guys.
-M
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 Bizarre
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| posted on May 23rd, 2009 at 01:27 PM |
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They slid in because the outside diameter is the same
They are thinner walled and hence have a larger inside diameter
There are varying comments on these
Jon Connolly from AC.net says " NO - period"
I know serveral that have 1641's and no problems
Personall the 88 slip ins (1680) is just plain pushing the freindship
Me - i would say with Mahle 85.5's (1600 stock)
Anyone who says there is noticeable difference by putting 1641 in instead of 1600 is playing with themselves
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bajachris88
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| posted on May 23rd, 2009 at 01:28 PM |
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they make the walls of the barrels thinner to have a larger combustion chamber. (therefore no machining required) Some people don't like that idea,
worrying about breaking them and them being weaker. But yet again, i have heard alot of people who haven't eva had an issue.
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Brian
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| posted on May 23rd, 2009 at 02:54 PM |
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the size of the combustion chamber has no significance
the larger bore is what increases the capacity
87's and 88's are no good in my opinion
use the std bore or machine the case and heads
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cram
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| posted on May 23rd, 2009 at 03:52 PM |
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for a stock 1600 stick with 85.5 forged or caste - you will not find a difference
if you are building a high output 1600 go with the forged - I think they also have a smaller skirt so you can run a 74/76 mm crank.
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VWCOOL
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| posted on May 24th, 2009 at 08:58 AM |
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Stock or hottie? Not sure about now, but years ago 1640s were available as cast or forged and I *think* there were some forged 1584cc sets for
'stock' class racing engines. These were Cima products - engineered/QC by Mahle in Brazil
There have been thousands of 'slip-in' 1640cc engines built around the planet. It's a free extra 5% capacity and grunt. There has been discussion
regarding the 1670/1680 as too thin - these barrels are very delicate and are easy to damage before or during engine assembly.
Like with any engine, do it properly and it'll be fine. Stuff it up, then you can blame your components
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matberry
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| posted on May 24th, 2009 at 09:44 AM |
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| Quote: | Originally
posted by VWCOOL
Stock or hottie? Not sure about now, but years ago 1640s were available as cast or forged and I *think* there were some forged 1584cc sets for
'stock' class racing engines. These were Cima products - engineered/QC by Mahle in Brazil
There have been thousands of 'slip-in' 1640cc engines built around the planet. It's a free extra 5% capacity and grunt. There has been discussion
regarding the 1670/1680 as too thin - these barrels are very delicate and are easy to damage before or during engine assembly.
Like with any engine, do it properly and it'll be fine. Stuff it up, then you can blame your components
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x2
I've built many stock and performance engines using 85.5 and 87's and would recommend either
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
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eraser
Fahrvergnugen
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| posted on May 24th, 2009 at 02:17 PM |
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thanks guys.
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 vw54
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| posted on May 25th, 2009 at 09:05 AM |
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there nuthing wrong with the Mahles on a stock engine they will last for ever
if your going to increase capacity then go to AAs or somthing else but you may have to have the brand new bores honed as sometimes there pretty
ruff compaired to what we are use to
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