Darton Sleeves for FA20 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

JP · 01-31-2013, 04:05 AM

They look the goods:

https://www.facebook.com/photo.php?f...type=1&theater

Bonburner · 01-31-2013, 04:19 AM

Call me stupid but what are those sleeves for?
Extending the chambers/oil flow/oil lubrication/etc.?

JP · 01-31-2013, 04:22 AM

allows you to run bigger pistons/more boost etc and they also have a "closed deck" skirt at the top now to help prevent bore-shift.

Mainly for the really serious engine builds.

WolfsFang · 01-31-2013, 05:07 AM

Correct me if im wrong but our engines are unsleeved, so we would just need to bore and install these sleeves for stock pistons to fit?

ft_sjo · 01-31-2013, 05:14 AM

Why would you go to all that trouble just to re-fit the OEM pistons?

JP · 01-31-2013, 05:15 AM

stock bores have a metal matrix liner cast into them. Bore that out, press these in, deck the sleeves to match the block, bore and finish the sleeves to fit for your choice of pistons.

From the "FA20 Engine Mechanical - Engine Unit - Details (2013 FR-S)" doc from toyota:

Quote:

(4) A compact block has been achieved by producing the thin cast-iron liners and cylinder block
sub-assembly as a unit. It is not possible to rebore a block which uses this type of liner.
(5) The liners are a undercut-type, which have been manufactured so that their casting exterior
forms a large irregular surface in order to enhance the adhesion between the liners and the
aluminum cylinder block sub-assembly. The enhanced adhesion helps improve heat dissipation,

resulting in a lower overall temperature and reduced heat deformation of the cylinder bores.

Bonburner · 01-31-2013, 05:16 AM

Mmmmm so it slides Into the combustion chamber?
bigger pistons ... ? How so, the diameter is set constant only xy horizontal expansion is possible so it lengthens the chamber with this mod to the block .. does this really work? hahaha

WolfsFang · 01-31-2013, 05:20 AM

Quote:

Originally Posted by ft_sjo

Why would you go to all that trouble just to re-fit the OEM pistons?

well i mean same size as stock.

s2kdrew · 01-31-2013, 01:35 PM

this is mainly for people who are rebuilding the engine, with all high performance internal parts. stroker kits is what these sleeve for, since original block wont have enough strength once you increase the engine displacement. and could handle high boost power too.

turbo_jimbo · 01-31-2013, 01:49 PM

That didnt take long.

Fnbeast86 · 01-31-2013, 01:56 PM

Quote:

Originally Posted by Bonburner

Call me stupid but what are those sleeves for?
Extending the chambers/oil flow/oil lubrication/etc.?

Really?

Tansey86 · 01-31-2013, 01:58 PM

It addresses the issues of having an open deck block, not ideal for boost and big power.

Bonburner · 01-31-2013, 02:00 PM

Quote:

Originally Posted by Tansey86

It addresses the issues of having an open deck block, not ideal for boost and big power.

Thank you, this was what I needed to wrap my head around these sleeves hahaha
So they slip into the cooling part of the block to add rigidity and keep its form under high rpm/pressures

Tansey86 · 01-31-2013, 02:04 PM

Quote:

Originally Posted by Bonburner

Thank you, this was what I needed to wrap my head around these sleeves hahaha
So they slip into the cooling part of the block to add rigidity and keep its form under high rpm/pressures

Exactly.

01-31-2013, 04:05 AM	#1
JP Backyard Fabricator Join Date: May 2012 Drives: JZX83, SF5 GT, ZZE82 turbo Location: Australia Posts: 303 Thanks: 47 Thanked 166 Times in 83 Posts Mentioned: 40 Post(s) Tagged: 0 Thread(s)	Darton Sleeves for FA20 They look the goods: https://www.facebook.com/photo.php?f...type=1&theater

01-31-2013, 05:07 AM	#4
WolfsFang Scrape Master Join Date: Jun 2012 Drives: Goal: Oldest FRS State Side Location: North NJ Posts: 1,161 Thanks: 238 Thanked 412 Times in 238 Posts Mentioned: 10 Post(s) Tagged: 0 Thread(s)	Correct me if im wrong but our engines are unsleeved, so we would just need to bore and install these sleeves for stock pistons to fit? __________________ You do realize comparing the BRZ to the FR-S is like comparing which hand you love masterbating too right?

01-31-2013, 01:35 PM	#9
s2kdrew Senior Member Join Date: Jun 2012 Drives: 2013 hot lava FRS Location: GTA Posts: 142 Thanks: 3 Thanked 6 Times in 5 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	this is mainly for people who are rebuilding the engine, with all high performance internal parts. stroker kits is what these sleeve for, since original block wont have enough strength once you increase the engine displacement. and could handle high boost power too. __________________ 2013 FRS 2000 S2000 2004 RSX-S 2002 RSX

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01-31-2013, 04:22 AM	#3
JP Backyard Fabricator Join Date: May 2012 Drives: JZX83, SF5 GT, ZZE82 turbo Location: Australia Posts: 303 Thanks: 47 Thanked 166 Times in 83 Posts Mentioned: 40 Post(s) Tagged: 0 Thread(s)	allows you to run bigger pistons/more boost etc and they also have a "closed deck" skirt at the top now to help prevent bore-shift. Mainly for the really serious engine builds.

01-31-2013, 05:14 AM	#5
ft_sjo Banned Join Date: Oct 2012 Drives: GT86 Location: The Motherland Posts: 1,398 Thanks: 140 Thanked 473 Times in 271 Posts Mentioned: 22 Post(s) Tagged: 0 Thread(s)	Why would you go to all that trouble just to re-fit the OEM pistons?

01-31-2013, 01:49 PM	#10
turbo_jimbo Member Join Date: Jan 2013 Drives: 01 MR-s, 78 280z, 13 FR-s Location: Las Vegas Posts: 68 Thanks: 3 Thanked 15 Times in 11 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	That didnt take long.

01-31-2013, 01:58 PM	#12
Tansey86 Senior Member Join Date: Sep 2012 Drives: 2003 Subaru Outback Location: Long Island, NY Posts: 1,318 Thanks: 154 Thanked 529 Times in 300 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	It addresses the issues of having an open deck block, not ideal for boost and big power.

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