Noob question - 1.8L compression reduction
#1
Noob question - 1.8L compression reduction
Noob here.
I'm considering a 94-95 1.8L Miata as a turbo project. I've done several other Megasquirt projects and turbo setups, the Miata seems like an inexpensive way to have a little fun.
Although I've read that the Mazda motor does just fine with stock compression and a turbo - is is possible to open up the combustion chamber a bit to drop the compression? Other vehicles I've worked on often have CNC options for making those changes.
If this isn't the usual method - other than pistons, how do you lower the compression a bit on these things?
I'm considering a 94-95 1.8L Miata as a turbo project. I've done several other Megasquirt projects and turbo setups, the Miata seems like an inexpensive way to have a little fun.
Although I've read that the Mazda motor does just fine with stock compression and a turbo - is is possible to open up the combustion chamber a bit to drop the compression? Other vehicles I've worked on often have CNC options for making those changes.
If this isn't the usual method - other than pistons, how do you lower the compression a bit on these things?
#3
Thanks for the reply. Being a noob and all, I have to ask:
How much power is that?
The other variable that's in play is that I'd like to run on pump gas. Can I max out the stock rods on pump gas with stock compression? Just beyond that - can you drop the compression on the Miata without swapping pistons - via the head cc enlargement that I'm talking about above?
How much power is that?
The other variable that's in play is that I'd like to run on pump gas. Can I max out the stock rods on pump gas with stock compression? Just beyond that - can you drop the compression on the Miata without swapping pistons - via the head cc enlargement that I'm talking about above?
#4
Thanks for the reply. Being a noob and all, I have to ask:
How much power is that?
The other variable that's in play is that I'd like to run on pump gas. Can I max out the stock rods on pump gas with stock compression? Just beyond that - can you drop the compression on the Miata without swapping pistons - via the head cc enlargement that I'm talking about above?
How much power is that?
The other variable that's in play is that I'd like to run on pump gas. Can I max out the stock rods on pump gas with stock compression? Just beyond that - can you drop the compression on the Miata without swapping pistons - via the head cc enlargement that I'm talking about above?
You can get Forged rods that youll never max out for $300-$400. Thats the weak point of our motors... Those and the ECU
#7
But you can do forged rods for about $300.... JUST DO IT! lol
And, depending on your end goals, while you are already in there, you may as well do Pistons/rings, All ARP bolts and studs, MAYBE a billet oil pump, and replace all the seals...
But, that all depends on your "endgame" at the least do the rods, and call it did
Last edited by supercooper; 11-19-2013 at 09:26 AM.
#9
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When choosing a miata, I would say go with the 94 over the 95. For sure it will be OBDI and have the oil feed port on the driver side of the engine. Long term they can make things slightly easier depending on where you live and such.
You will want either a gt2554 or a gt2560 is you are on a budget. Both will spool quick and won't grenade the engine. The gt2554 will top out at about 220hp at the wheel, the gt2560 can top out around 300hp at the wheels.
You will want either a gt2554 or a gt2560 is you are on a budget. Both will spool quick and won't grenade the engine. The gt2554 will top out at about 220hp at the wheel, the gt2560 can top out around 300hp at the wheels.
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