Group Evo IX Engine Build
#1
Group Evo IX Engine Build
I have a complete evo IX head and bare block (4G63). Plan is to use 94mm crankshaft for a 2.158L (85.5mm bore).
Redline will be 8,297 rpm, if we limit piston speed to 26 m/s. I'm looking for best power band and not biggest power in a 500 rpm range. LOL
I'll add more info as I figure it out.
"Group" build is in reference with all your comments and suggestions to help guide me on the best path. Looking forward to reading on your tried and true options
Redline will be 8,297 rpm, if we limit piston speed to 26 m/s. I'm looking for best power band and not biggest power in a 500 rpm range. LOL
I'll add more info as I figure it out.
"Group" build is in reference with all your comments and suggestions to help guide me on the best path. Looking forward to reading on your tried and true options
Last edited by 2006EvoIXer; Apr 24, 2018 at 10:06 AM.
The following 2 users liked this post by RazorLab:
2006EvoIXer (Apr 24, 2018),
ronaldo9 (Apr 24, 2018)
#3
Update:
Crankshaft:
I ended up going with K1 Billet 94mm crankshaft
K1T 032BC940
Rods:
Ended up buying off the shelf Carrillo 150mm with Carriage Bolts
Pistons:
Ended up going with Manley 618005CE-4 pistons. It didn't look like what I was seeing in pictures (surprise! Pictures don't always show what you're buying, that's so stupid!). Fortunately, these pistons are beefier.
Crankshaft:
I ended up going with K1 Billet 94mm crankshaft
K1T 032BC940
Rods:
Ended up buying off the shelf Carrillo 150mm with Carriage Bolts
Pistons:
Ended up going with Manley 618005CE-4 pistons. It didn't look like what I was seeing in pictures (surprise! Pictures don't always show what you're buying, that's so stupid!). Fortunately, these pistons are beefier.
Last edited by 2006EvoIXer; Jul 3, 2018 at 11:59 PM.
#4
I'm planning for DD with weekend warrior duties. I think something to maximize FP MHI Red for broadest power band. 91 octane / E85 setup that is stealth enough to pass smog police visual inspections. I'm aiming for 600whp/500tq on E85. And potential to make 750whp/600tq.
Last edited by 2006EvoIXer; Jun 23, 2018 at 06:14 AM.
#5
EvoM Guru
iTrader: (1)
I would call English Racing for the rods and Pistons. If you're going to limit RPM to 8300, stick with a 150mm off the shelf rod and get a custom piston with the appropriate pin height. It'll save you some money vs using both a custom rod and a custom piston.
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2006EvoIXer (Apr 24, 2018)
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#8
EvoM Guru
iTrader: (9)
The 94mm or 100mm crank makes a great street car engine and moderate levels. I would go with a lightweight Carillo 150mm rod, a .230 or .250 wall pin and a 9:1 compression ratio for 91 octane. An MHI housing isn't going to flow well above 7000 so don't worry about trying to turn it past 8000. The 100mm crank would make the situation worse because of increased backpressure.
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2006EvoIXer (Apr 24, 2018)
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2006EvoIXer (Apr 24, 2018)
#13
EvoM Guru
iTrader: (1)
The rod ratio with 94mm crank and 150mm rod is fine. And the non-custom rod saves a lot of money.
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2006EvoIXer (Apr 24, 2018)
#14
I've been out of school way too long! Can someone calculate the centripetal force Carrillo rods exert on crankshaft at 8500 rpm? I came up with about 9,500 pounds (566 g per rod). Add the piston of about 4,900 pounds (292 g per piston) and we get 14,400 pounds of force that crank pulls at start of suction stroke. So each rod bolt is pulling 7,200 pounds? This can't be right.
And at 9000 rpm, I get 16,100 pounds, so 8000 pounds per rod bolt. Isn't the cross-section of a rod bolt about 0.11 sq in for 3/8" bolt? 200 ksi (for ARP2000) × 0.11 sq in = 22,000 pounds?
And at 9000 rpm, I get 16,100 pounds, so 8000 pounds per rod bolt. Isn't the cross-section of a rod bolt about 0.11 sq in for 3/8" bolt? 200 ksi (for ARP2000) × 0.11 sq in = 22,000 pounds?
Last edited by 2006EvoIXer; Apr 25, 2018 at 12:06 AM.
#15
EvoM Guru
iTrader: (1)
You're over thinking this. The 94mm stroke is fine at 9000rpm with a 150mm rod. The 94/153 is fine at 9600 (for drag racing anyways, probably would keep either below 9000 for road course work). Regardless, with the red, it's going to make peak power around 7-7500, and be falling off by 8. You won't want to rev it past 8.
And if you're only going to throw a red at it, eagle Hbeams will more than handle what the red can make. They're good to about 570wtq. The red won't make more than about 525wtq.
And if you're only going to throw a red at it, eagle Hbeams will more than handle what the red can make. They're good to about 570wtq. The red won't make more than about 525wtq.
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2006EvoIXer (Apr 25, 2018)