compression ratios
#1
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Join Date: Apr 2012
Location: Central Coast, NSW, Australia
Posts: 5
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So i have a '92 model with a 1.6 that is getting closer and closer to death, ive got a '99 bp motor that is going to replace it. My plan is to build the bp to help support a turbo conversion. I am currently on my p plates in australia so im restricted to no forced induction for another 12 months. my power goals are around the 300hp mark, maybe more, maybe less, ill see what i can get.
From what i can figure, i have several options:
1. Swap the bp in now as is to replace the dying motor and build/turbo in 12 months.
2. Build the motor now to turbo spec i.e.: lower compression forged pistons and rods etc. i do understand that you can run a turbo setup without building the engine, but for safety and a bit of piece of mind im choosing to.
3. Hope the 1.6 lasts for another 12 months while building the 1.8 and put it in with the turbo once i get my full license.
Im leaning towards option 2 because it means i can diagnose problems with the engine swap separately to the conversion to FI and i wont have to rip the motor out again for the foreseeable future. My question is this, will i be able to run the motor without a turbo with the lower compression ratio, probably 9.0:1, by compensating for the lack of compression via ECU tuning?
sorry if this has already been answered or the answer is blatantly obvious.
From what i can figure, i have several options:
1. Swap the bp in now as is to replace the dying motor and build/turbo in 12 months.
2. Build the motor now to turbo spec i.e.: lower compression forged pistons and rods etc. i do understand that you can run a turbo setup without building the engine, but for safety and a bit of piece of mind im choosing to.
3. Hope the 1.6 lasts for another 12 months while building the 1.8 and put it in with the turbo once i get my full license.
Im leaning towards option 2 because it means i can diagnose problems with the engine swap separately to the conversion to FI and i wont have to rip the motor out again for the foreseeable future. My question is this, will i be able to run the motor without a turbo with the lower compression ratio, probably 9.0:1, by compensating for the lack of compression via ECU tuning?
sorry if this has already been answered or the answer is blatantly obvious.
#7
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Join Date: Apr 2012
Location: Central Coast, NSW, Australia
Posts: 5
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thanks guys that answers my question. anyway, previous owner was useless and managed to flatten one side of the keyway on the crank :/ its loc-tited back together now but every now and then it still feels like its slipped out of timing a bit and then comes good again. it just doesn't feel right anymore.
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