Engine Block # - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

ichitaka05 · 05-05-2012, 10:28 PM

No, I'm not asking for name of the engine.

So while I was reading Japanese 86 site, I read that, in the engine block, there are a five digit numbers plus a four letter.
Example:
22222 BBBB
232323 ABAB

They said that, if you have all the numbers & letters same, better the quality of that engine was built.

There were few owners w 22212 BBBB, 21122 BBBB, but most owner had 22222 BBBB

so just wondering how's US or other country FRS/BRZ/GT86 owner engine built was

Dimman · 05-05-2012, 10:34 PM

That's for piston to bore fit on Subarus or something?

ichitaka05 · 05-05-2012, 10:39 PM

Quote:

Originally Posted by Dimman

That's for piston to bore fit on Subarus or something?

Idk, the forum starter didn't explain enough. Just ask what everyone has on the block

Dimman · 05-05-2012, 11:03 PM

Quote:

Originally Posted by ichitaka05

Idk, the forum starter didn't explain enough. Just ask what everyone has on the block

Some of the Subie guys can probably clarify but I think it has to do with making sure the right pistons go in the right bores when the engine is being built. I guess ideally if they were all the same the motor could be better balanced, but that's pretty extreme.

ichitaka05 · 05-05-2012, 11:21 PM

Quote:

Originally Posted by Dimman

Some of the Subie guys can probably clarify but I think it has to do with making sure the right pistons go in the right bores when the engine is being built. I guess ideally if they were all the same the motor could be better balanced, but that's pretty extreme.

I thought I'm a Subie guy, but man I must be not a Gearhead than I've thought. I need to go back to garage & study more lol

civicdrivr · 05-05-2012, 11:33 PM

This probably doesnt translate to Subarus, but the Honda J series has a stamp in the bottom of the block that coincides with the crank bearings.

Jeff Lange · 05-06-2012, 12:33 AM

Typically numbers like this on the block will indicate cylinder bore sizes and crankshaft main bearing bore sizes. If the numbers and/or are all the same, then the block is "more precisely" machined, and all of your sizing is the same.

It honestly doesn't really matter though, as what these are actually used for is to correctly select the bearings and pistons to give you the correct oil clearances, which should be consistent across all engines.

Jeff

Calum · 05-06-2012, 07:49 AM

That would seem to matter if you replacing those parts.

To throw some more fuel on the fire, it could indicate how well the different parts of the mold were lined up during the casting process. I know older engines sometimes had trouble if they were being bored out and the casting didn't line up well, the cylinder walls would be too weak.

Jeff Lange · 05-06-2012, 10:44 AM

Correct, it matters when replacing parts. There will be markings on the crankshaft that also indicate the journal diameters for the mains and rods and markings on the rods as well. If you are replacing these parts you will use these markings to know which bearings and/or pistons to order to maintain the correct clearances.

Jeff

Draco-REX · 05-06-2012, 10:46 AM

The letters are for the bores, so I believe the numbers are for the main bearings.

Jeff Lange · 05-06-2012, 11:24 AM

Correct, there are 4 pistons and 5 main bearing journals.

Jeff

carbonBLUE · 05-06-2012, 12:17 PM

Quote:

Originally Posted by ichitaka05

No, I'm not asking for name of the engine.

So while I was reading Japanese 86 site, I read that, in the engine block, there are a five digit numbers plus a four letter.
Example:
22222 BBBB
232323 ABAB

They said that, if you have all the numbers & letters same, better the quality of that engine was built.

There were few owners w 22212 BBBB, 21122 BBBB, but most owner had 22222 BBBB

so just wondering how's US or other country FRS/BRZ/GT86 owner engine built was

where exactly on the block is it?

ichitaka05 · 05-06-2012, 12:18 PM

Quote:

Originally Posted by carbonBLUE

where exactly on the block is it?

Let me check the Japanese forum...

ichitaka05 · 05-06-2012, 12:22 PM

He said
"Center of engine block below engine throttle."

05-05-2012, 10:28 PM	#1
ichitaka05 Site Moderator Join Date: Oct 2009 Drives: ichi 86 Project Location: Middle of No where Posts: 21,050 Thanks: 7,728 Thanked 19,278 Times in 8,388 Posts Mentioned: 697 Post(s) Tagged: 28 Thread(s)	Engine Block # No, I'm not asking for name of the engine. So while I was reading Japanese 86 site, I read that, in the engine block, there are a five digit numbers plus a four letter. Example: 22222 BBBB 232323 ABAB They said that, if you have all the numbers & letters same, better the quality of that engine was built. There were few owners w 22212 BBBB, 21122 BBBB, but most owner had 22222 BBBB so just wondering how's US or other country FRS/BRZ/GT86 owner engine built was __________________

05-05-2012, 11:33 PM	#6
civicdrivr Senior Member Join Date: Mar 2012 Drives: 2018 Golf R Location: Richmond, VA Posts: 2,807 Thanks: 5,386 Thanked 1,095 Times in 647 Posts Mentioned: 68 Post(s) Tagged: 7 Thread(s)	This probably doesnt translate to Subarus, but the Honda J series has a stamp in the bottom of the block that coincides with the crank bearings. __________________ Parting out HERE

05-06-2012, 12:33 AM	#7
Jeff Lange Senior Member Join Date: Dec 2011 Drives: 1986 AE86 GT-S, 2011 Lexus IS250 6M Location: Calgary, Canada Posts: 661 Thanks: 136 Thanked 362 Times in 161 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	Typically numbers like this on the block will indicate cylinder bore sizes and crankshaft main bearing bore sizes. If the numbers and/or are all the same, then the block is "more precisely" machined, and all of your sizing is the same. It honestly doesn't really matter though, as what these are actually used for is to correctly select the bearings and pistons to give you the correct oil clearances, which should be consistent across all engines. Jeff __________________ 2011 Lexus IS350 F-Sport 6MT with LSD 1986 Toyota Corolla GT-S Supercharged

05-06-2012, 10:44 AM	#9
Jeff Lange Senior Member Join Date: Dec 2011 Drives: 1986 AE86 GT-S, 2011 Lexus IS250 6M Location: Calgary, Canada Posts: 661 Thanks: 136 Thanked 362 Times in 161 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	Correct, it matters when replacing parts. There will be markings on the crankshaft that also indicate the journal diameters for the mains and rods and markings on the rods as well. If you are replacing these parts you will use these markings to know which bearings and/or pistons to order to maintain the correct clearances. Jeff __________________ 2011 Lexus IS350 F-Sport 6MT with LSD 1986 Toyota Corolla GT-S Supercharged

05-06-2012, 11:24 AM	#11
Jeff Lange Senior Member Join Date: Dec 2011 Drives: 1986 AE86 GT-S, 2011 Lexus IS250 6M Location: Calgary, Canada Posts: 661 Thanks: 136 Thanked 362 Times in 161 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	Correct, there are 4 pistons and 5 main bearing journals. Jeff __________________ 2011 Lexus IS350 F-Sport 6MT with LSD 1986 Toyota Corolla GT-S Supercharged

05-06-2012, 07:49 AM	#8
Calum That Guy Join Date: Dec 2011 Drives: 2013 asphalt FRS MT Location: Halifax, Nova Scotia Posts: 4,865 Thanks: 5,058 Thanked 2,868 Times in 1,499 Posts Mentioned: 82 Post(s) Tagged: 1 Thread(s)	That would seem to matter if you replacing those parts. To throw some more fuel on the fire, it could indicate how well the different parts of the mold were lined up during the casting process. I know older engines sometimes had trouble if they were being bored out and the casting didn't line up well, the cylinder walls would be too weak.

05-06-2012, 10:46 AM	#10
Draco-REX Corner Junkie Join Date: Feb 2012 Drives: 13 BRZ, 11 STI, 99 RS Location: Ohio Posts: 2,908 Thanks: 129 Thanked 1,521 Times in 702 Posts Mentioned: 11 Post(s) Tagged: 0 Thread(s)	The letters are for the bores, so I believe the numbers are for the main bearings.

05-06-2012, 12:22 PM	#14
ichitaka05 Site Moderator Join Date: Oct 2009 Drives: ichi 86 Project Location: Middle of No where Posts: 21,050 Thanks: 7,728 Thanked 19,278 Times in 8,388 Posts Mentioned: 697 Post(s) Tagged: 28 Thread(s)	He said "Center of engine block below engine throttle." __________________

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