Bp5a swap NA8 - Miata Turbo Forum - Boost cars, acquire cats.

Engine Performance This section is for discussion on all engine building related questions.
Sponsored by:
Sponsored by:

Bp5a swap NA8

Old 09-13-2015, 02:18 PM
Thread Starter
Join Date: Sep 2015
Posts: 1
Total Cats: 0
Default Bp5a swap NA8

Hey folks first post here so take it easy on me. I own a nicely modded street NA8 94. My motor is getting tired it' runs well it just isn't very exciting any more. Did a compression check low 140's. So I'm looking to do a rebuild or buy a low mile Bp5a 6 speed swap. I'm here in Cali so CARB/ will be running (at least for now) stock ECU. My thinking and I can be wrong, Usdm NB1 (have one) intake mani, NA8 injectors and rail, stock timing and CAS. I'm I on the right track? I'm un sure of the bp5a's compression 9.5:1 or 10:1. We only have 91 Oct hear so theres that. Should still pass emissions? thank you for any advice
Will_da_beast is offline  
Old 09-14-2015, 08:06 PM
Junior Member
Join Date: May 2010
Location: Tampa, Florida
Posts: 133
Total Cats: -42

I believe the BP-5A engine has 9:1 compression ratio because it is the turbo engine. The 99-00 engines have 9.5:1 and the 01-05 VVT engines have 10:1 compression ratios.
my97miata is offline  
Related Topics
Thread Starter
Last Post
Miata parts for sale/trade
09-22-2017 01:34 PM
Meet and Greet
10-02-2015 03:17 AM
Engine Performance
09-30-2015 11:28 PM
DIY Turbo Discussion
09-30-2015 03:44 PM
Meet and Greet
09-28-2015 02:04 PM

Thread Tools
Search this Thread
Quick Reply: Bp5a swap NA8

Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2018 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.