Miata Piston thread...revisited

[Gen1GT]

An intercooler can never be TOO efficient, but you won't know if it's effecient ENOUGH til you use it. If you have problems with detonation, you can always try your hand at water injection.

[JesseSays]

there's plenty of formulas to figure out what's big enough for an intercooler.

and you CAN have too much intercooler, as the pressure drop increases lag and response time, something important on a street car.

also, "risk of detonation"

there's ALWAYS a risk. the key is tuning, and not half-assed, "well it sorta runs" ****. Get it on a dyno, spend a number of hours with a GOOD tuner, and get the car dialed in.

[Gen1GT]

Show me where I said you can't have 'too much' intercooler? I said it can never be TOO efficient.

[D323]

oh I found a local dyno tuner that is really good with cars. he charges like 45 bux for 3 pulls.

I have already talked to him. He is going to help me tune once its all in and running.

I know ppl reccomend the starion IC but do you think that it will be large enough?

Ontop of that I will be runing a 3' exhaust pipe, I guess I should run the same for the IC piping. Anynoe know the diameter of the turbo?

[JesseSays]

Show me where I said you can't have 'too much' intercooler? I said it can never be TOO efficient.

+1 to you. I misread it.

[JesseSays]

oh I found a local dyno tuner that is really good with cars. he charges like 45 bux for 3 pulls.

I have already talked to him. He is going to help me tune once its all in and running.

I know ppl reccomend the starion IC but do you think that it will be large enough?

Ontop of that I will be runing a 3' exhaust pipe, I guess I should run the same for the IC piping. Anynoe know the diameter of the turbo?

45 bucks = 3 pulls?

May want to ask him about his hourly rate on the dyno...3 pulls won't even get you a decent baseline.

[D323]

I called him this morning and he said it was 15 bux for 3 pulls and I might want to look at spend 45 bux or more to get a decent baseline like you said. My fault misunderstood him.

[Gen1GT]

Still, those are pretty good rates.....

[Qfactor]

So out of all of this .... debating, we still don't know which pistons fit in our good ol' BP, without interfering with valves.


anyone which to enlighten our ignorant n00bs with this info.

01 miata 10:1 - Do they fit?


Q

[zenilder]

Every single miata piston fits.

WTF?

I'm not even going to bother quoting.


Mod - Please close this thread.

[Gen1GT]

Every single miata piston fits.

WTF?

I'm not even going to bother quoting.


Mod - Please close this thread.

Who's rattled?

For the record, every 1.8 Miata piston will fit in every 1.8 Protege.

[FE3-323]

how did someone or how would someone... wind up with interfering piston/valve? if just adding the pistons doesn't do this what would?

there are a few misc differences in/on each head EGT/Protege'/Miata
who is 100%positive that this doesn't make a difference when swapping pistons... no offense but i need to see some proof... either pics of combustion chambers and differences (i heard there are minute differences) or some sort of research done to prove no differences....
there are so many different thoughts out there... someone needs to be the all knowing about this.

[91ProtegeLX]

im all knowing. Im am the ProtegeGod. Ask me anything.

[Gen1GT]

What would make your engine an interference engine could be many factors. A smaller deck height for one. Deck height is the distance from the flap top of a piston, to the bottom of the cylinder head. You want a deck height to be at least .030" to allow for expansion and piston rock. Fortunately for us, deck height is something is the region of .340". Which means that even at max lift, the valve will never hit the piston, even if it's at TDC. The Miata 10:1 pistons have a higher compression height, therefore less deck height, but larger valve reliefs. Another way to make an interference engine, is by more valve lift. Higher lift means the valves come closer to the piston.

You want proof eh? Why is this our job to prove it to you? If you're doing an engine build, it's up to you to know the specs of the engine you're putting together. You need to know piston dish/dome, deck height, head gasket thickness and net valve lift. Here's a pic

[JesseSays]

and if you start playing with some really high compression/small deck height stuff, start factoring in rod stretch.

Ideally, you want the clearances at redline to be as small as you're willing to go. Some race engine builders are making it so that at redline, the piston *kisses* the head.