Leatherface's hemorrhaging neck cyst aka (ticking time bomb) - Page 30 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 09-22-2010, 12:14 PM   #581
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in my ever growing laziness, I took my car to Ryan last night (gdnimrod) and let him do the rear main seal replacement. No more leaks! I really wouldnt trust anyone else to work on my car with me not being around outside of Ryan and Phil.

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Old 09-22-2010, 12:15 PM   #582
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How long did it take him? Sign on ***!
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Old 09-22-2010, 12:18 PM   #583
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you FL folks really like to have the motor outside the car more than inside/running.
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Old 09-22-2010, 12:22 PM   #584
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blah. At least it isnt leaking anymore
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Old 09-22-2010, 12:27 PM   #585
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did you pull the motor to do it?
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Old 09-22-2010, 12:36 PM   #586
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nah. no need. he had that tranny cart and just dropped it on there and slid it back
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Old 09-22-2010, 12:49 PM   #587
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in that picture it sorta looked like a motor was pulled is all. i got scurred.
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Old 09-22-2010, 01:08 PM   #588
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Hey leatherface, can you post your spark map?
Or email it to me if you don't mind sharing.

Or copy/pasta the peak pressure row into here starting at, say, 3k rpm.


I wanna see how much timing you're getting away with on a whopping 19psi on stock block. You are inspiring me to turn up the boost a bit
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Old 09-22-2010, 01:18 PM   #589
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Quote:
Originally Posted by leatherface24 View Post



Yes and no. For the power i eventually want (400 rwhp capable) Ill need the pistons. Im over 300 now..
Why though? From the research I've done there is no reason that you actually need forged pistons other than a bit of extra resistance to detonation. I built an R32 GTR a few years ago and used a brand new crate OEM NUR Spec RB26. All it had was forged rods. We put in some ARP rod bolts and put it back together. That engine made 580AWHP on 1.8 bar (26PSI)... mind you it was tuned by a genius (Eric Tsu from XS Engineering).

But still... that engine had cast pistons. I think for a street build (street to me = not beating the **** out of it for 30 min. sessions on the track) coated cast pistons would be more reliable when tuned right. Throw a little water injection in there and there is absolutely no reason for the pistons to cause any grief.

But that's just my opinion.... and I'm a backyard mechanic so it means nothing..
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Old 09-22-2010, 02:40 PM   #590
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Quote:
Originally Posted by falcon View Post
I built an R32 GTR a few years ago and used a brand new crate OEM NUR Spec RB26. All it had was forged rods. We put in some ARP rod bolts and put it back together. That engine made 580AWHP on 1.8 bar (26PSI)... mind you it was tuned by a genius (Eric Tsu from XS Engineering).

But still... that engine had cast pistons.

I fail to see how a 2.6 liter inline 6 is in any way relevant to anything on this forum.
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Old 09-22-2010, 02:47 PM   #591
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It's a 6cyl engine making big turbo power with cast pistons. Making over 700 crank HP (since you can't compare AWHP to RWHP) on a 2.6L inline 6cyl is similar to breaking the 350-400whp mark on a 4cyl. So it's totally relevant.


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Old 09-22-2010, 02:58 PM   #592
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Quote:
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Why though?
Stronger against detonation, peace of mind.
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Old 09-22-2010, 03:02 PM   #593
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Quote:
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I fail to see how a 2.6 liter inline 6 is in any way relevant to anything on this forum.
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Old 09-22-2010, 03:07 PM   #594
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LMAO at the title change

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Old 09-22-2010, 03:07 PM   #595
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Nice thread title revision. lol
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Old 09-22-2010, 03:08 PM   #596
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Old 09-22-2010, 03:34 PM   #597
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Quote:
Originally Posted by leatherface24 View Post
Stronger against detonation, peace of mind.
Ya I guess... and that's why I'm running forged. But a properly tuned engine with quality cast pistons can be just as reliable. But the key to that sentence is "properly tuned."

So what are you going to do when you build a forged engine? Just what seems to be the forum standard... supertechs?
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Old 09-22-2010, 03:47 PM   #598
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Wisecos again but im debating weather or not to do 83.5 or 84.5mm
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Old 09-22-2010, 04:15 PM   #599
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Quote:
Originally Posted by falcon View Post
It's a 6cyl engine making big turbo power with cast pistons. Making over 700 crank HP (since you can't compare AWHP to RWHP) on a 2.6L inline 6cyl is similar to breaking the 350-400whp mark on a 4cyl. So it's totally relevant.

Not all cast pistons are created equal.
Your example really doesn't apply here: you're talking about a motor with more cylinders, different compression, pretty much different EVERYTHING and making different power levels than our cars and trying to compare.

That's like saying that all inline 4 cylinders can make 1200whp like some DSM's do
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Old 09-22-2010, 04:25 PM   #600
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thick, strong ring lands.
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