Compression difference between AT/MT?

Reply Subscribe

Thread Tools

Search this Thread

10-26-2007, 08:59 AM

#21

viciousclipse

Junior Member

Join Date: Oct 2005

Location: king george, va

Posts: 85

Total Cats: 0

well since the a/t 1.6 is so disirable ill trade mine straight up for a 1.8......anybody?

10-26-2007, 11:32 AM

#22

Doppelgänger

Elite Member

iTrader: (12)

Join Date: Sep 2007

Location: Charlotte, NC

Posts: 6,850

Total Cats: 71

Quote:

Originally Posted by ApexOnYou

Honestly dont know why the compression would be lower.. I would assume it would be to lower power output for longer life out of the AT.. But thats an un-educated guess lol. Its looking like that AT spare engine is identical to my current.. Ill check the cam casting numbers between the two this weekend, just out of curiosity to see if the cams are different like on the B6 engines.

So you're goign to swap from a 1.8 to a 1.6? IIRC, there are no differences in comp. on 1.8L motors (BP) as stated above.

If you're in a search for more/safer airflow, buy a 99 head?

10-26-2007, 12:31 PM

#23

hustler

Tour de Franzia

iTrader: (6)

Join Date: Jun 2006

Location: Republic of Dallas

Posts: 29,085

Total Cats: 375

Quote:

Originally Posted by neogenesis2004

please buy wiseco pistons, your grandmother will thank you. http://www.raceeng.com/searchadv.asp...x=0&submit.y=0
best price and they stock them so you'll get them in less than a week instead of waiting a month.

what's so bad about the supertechs?

10-26-2007, 12:54 PM

#24

neogenesis2004

Elite Member

iTrader: (12)

Join Date: Aug 2006

Posts: 4,413

Total Cats: 20

Nothing is bad about them, don't get your panties in a bunch I know you bought them.

10-26-2007, 12:54 PM

#25

hustler

Tour de Franzia

iTrader: (6)

Join Date: Jun 2006

Location: Republic of Dallas

Posts: 29,085

Total Cats: 375

Quote:

Originally Posted by neogenesis2004

Nothing is bad about them, don't get your panties in a bunch I know you bought them.

I went back and forth with this...I'd hate to put something in that motor that has a bad reputation. I saw praise for the pistons from the subaru crew.

10-26-2007, 02:32 PM

#26

ApexOnYou

Senior Member

Thread Starter

iTrader: (10)

Join Date: Feb 2007

Location: South Eastern Wisconsin

Posts: 1,274

Total Cats: 0

Sorry, it seems I have gotten the wrong idea across lol. To clarify more:

I have a 1.8L in currently, the Miata is of course MT. I also have a 1.8L spare engine out of a AT 94 Miata, they are both BPs, I didnt mean to swap a AT B6 in, I was just trying to figure out if my spare BP which came out of a AT Miata had different cams or pistions.

DropTopDrifter, I do want to eventually get a 99 head, just not quite yet. I still have no EMS or forged goodies haha.

10-26-2007, 02:44 PM

#27

neogenesis2004

Elite Member

iTrader: (12)

Join Date: Aug 2006

Posts: 4,413

Total Cats: 20

Quote:

Originally Posted by hustler

I went back and forth with this...I'd hate to put something in that motor that has a bad reputation. I saw praise for the pistons from the subaru crew.

They will be fine.