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12-11-2020, 05:58 PM | #126 | |
Scooby Specialist
Member#: 260314
Join Date: Oct 2010
Chapter/Region:
NESIC
Location: S central CT, New England
Vehicle:2007 STI silver gray metallic |
Quote:
I don't think 450 would be a big deal. I think saying the stock rods can't take it is wrong. Perhaps not the best choice for 500 or a bit more but I have heard of people doing it. Look at "bragging rights". If this is a street car I would do the RA SB. If you are going to be racing some and street mostly then I'd suggest buying the case, crank, bearings, rods of choice and Mahle pistons in 4032 aluminum alloy to allow for tighter cylinder to wall clearances and improved temperature stability. I am building a DD engine this way and will make about 350. The thing is, it will be able to rev like crazy, safely. I will be cutting 30% (roughly) off the weight of the reciprocating parts. It would be like an RA but with much lighter rods and pistons.
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12-11-2020, 08:22 PM | #127 | ||
Scooby Guru
Member#: 33782
Join Date: Mar 2003
Chapter/Region:
MAIC
Location: Milton Keynes, UK
Vehicle:96 3MI Racing search FIRST, then PM!!! |
Quote:
Quote:
OP: 1.) Guys have made big power on all years, and it's safe to say they're all time bombs. 2.) Then take into account "450 whp". Dyno's don't all read the same. For instance, we had a customer that was making 470 on a Dynopack and then made 360 whp on our Mustang. It was also notoriously a heart breaker with stock STi's making 205-210 whp. 3.) Is this a street car that might see 450 whp every once in a blue moon, or is this going to be raced? If raced, I would skip right to forged rods and pistons. Just my $0.02. |
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01-15-2021, 07:34 AM | #128 |
Scooby Newbie
Member#: 142417
Join Date: Mar 2007
Location: LONG ISLAND
Vehicle:2011 STi Dgm |
Does anyone know if 2019 STis with 2018 build dates will have the RA block too?
I’m looking at new 2020 or 2021 and some used 2020s and 2019s. Some of the 19s were built in 2018. |
02-23-2021, 11:01 AM | #129 |
Scooby Newbie
Member#: 142417
Join Date: Mar 2007
Location: LONG ISLAND
Vehicle:2011 STi Dgm |
Nobody knows if build date determines what cars get RA blocks? Is it all 2019s regardless of build date?
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03-10-2021, 07:05 PM | #130 |
Scooby Specialist
Member#: 111692
Join Date: Apr 2006
Chapter/Region:
Tri-State
Location: Jersey burbs
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As noted earlier PrimeMotoring tuned RA blocks to well above 500whp, and Botti tuning reported the RA block can handle 500whp safely, does it make RA block a perfect replacement for a daily driven STI?
Do other tuners /shops confirm this trend? |
03-13-2021, 03:44 AM | #131 |
Scooby Newbie
Member#: 522441
Join Date: Feb 2021
Location: SLC, UT
Vehicle:2007 OBXT Pearl White |
Subbing to this thread. Very interested to see the results. Rebuilding my engine rn with a Type RA Block shooting for 400whp on meth and can't decide if I wanna split the block or not.
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03-13-2021, 03:45 AM | #132 |
Scooby Newbie
Member#: 522441
Join Date: Feb 2021
Location: SLC, UT
Vehicle:2007 OBXT Pearl White |
I will say though, if you look at this thread, there have just recently been some people reporting spun bearings on the RA block at sub 400whp.
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04-03-2021, 09:42 PM | #133 |
Scooby Newbie
Member#: 523256
Join Date: Mar 2021
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I had a customer car (20 sti) come in for a shortblock replacement after he received 3 broken pistons from getting an e-tune from someone with no wideband. Was probably somewhere in the low 400ish range on ethanol.
They breaks/cracks were exactly the way they are on the usual 2.5 piston |
05-05-2021, 12:53 PM | #134 | |
Scooby Specialist
Member#: 437670
Join Date: Jan 2016
Location: VT
Vehicle:2005 2.5 SC OB |
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How do we measure the 1 or 2 or mm of additional material. Do you measure from the top of the piston to the little carved out recess for the wrist pin? Curious what these 2 measurements are... |
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02-20-2022, 10:23 PM | #135 |
Scooby Newbie
Member#: 521263
Join Date: Dec 2020
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Piston material
Anyone know if the RA pistons are made with a different metal than that used in the older STI pistons?
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02-21-2022, 07:21 AM | #136 |
NASIOC Vendor
Member#: 198281
Join Date: Dec 2008
Chapter/Region:
MAIC
Location: Virginia
Vehicle:2005 WRX/STi WRB of course |
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02-24-2022, 10:10 AM | #137 |
Scooby Newbie
Member#: 521263
Join Date: Dec 2020
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Cost of RA pistons
KillerB, who sells the most affordable RA pistons and do you know of a reputable company that can do the metallurgic analysis? I’m considering sending one for analysis. I understand if you don't know but, it doesn’t hurt to ask. Thanks
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02-24-2022, 04:04 PM | #138 | |
NASIOC Vendor
Member#: 198281
Join Date: Dec 2008
Chapter/Region:
MAIC
Location: Virginia
Vehicle:2005 WRX/STi WRB of course |
Quote:
For something like that, I'd just try to find a spent on either here or Ebay so you don't have to spend money on new. |
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02-28-2022, 05:09 PM | #139 |
Scooby Newbie
Member#: 521263
Join Date: Dec 2020
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12-26-2022, 06:40 AM | #140 |
Scooby Newbie
Member#: 188258
Join Date: Aug 2008
Vehicle:1999 gc8 6spd |
i saw some pics about new type ra block
did casting change again ? something like 706? |
12-26-2022, 06:40 AM | #141 |
Scooby Newbie
Member#: 188258
Join Date: Aug 2008
Vehicle:1999 gc8 6spd |
...........
Last edited by turbosenna; 12-26-2022 at 06:43 AM. Reason: same post |
12-27-2022, 06:10 PM | #142 | |
Scooby Specialist
Member#: 515308
Join Date: Jun 2020
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Quote:
All this and prime is on E85 and they still die shortly. Everyone stop being cheap and throw some bearings and pistons in your RA now or later. |
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