I read something today that made me really upset. It made me so upset, I picked up the phone and made a bunch of phone calls. I was looking through this months MM&FF and found the flow numbers on stock PI heads. The exhaust flow is CRAP!!! Intake flow 177 cfm, exhaust flow 126 cfm. What's with that!?!?!?! They had a set of PI heads ported to 225 cfm intake and 208 cfm exhaust. I want some of those heads!!!! This tells me that our cars have way more hidden potential that just needs to be tapped. What do you guys think? I want some feed back.
This really makes me want a set of ported and polished heads now. I want to make more power
I'm with you, more power without bumping a compression ratio is always nice.
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Sometimes I think that government fits that old-fashioned definition of a baby: An alimentary canal with an appetite at one end and no sense of responsibility at the other.
- Ronald Reagan
Matt, check ebay, I saw a set their earlier today for $240.
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Black 99 GT
-- Current Mods: FIPK, C&L Plenum, 70mm FRPP Throttle Body, Steeda Triax Shifter, BBK Upper and Lower control arms.
-- Dyno @ 2500ft in elevation on a DynoJet 233.2 hp and 273.8 Torque
-- Future Mods: 4:10 Gears, Exhaust, Super
-- Current best time with only FIPK and pinging like an sob:
1/4 mile, Reaction - .139, 60ft - 2.284, ET 14.316, MPH - 98.278
I wouldn't call the stock exhaust flow crap but there is definitley room for improvement. You have to remember that it's only 4.6 liters. Those seemingly small flow numbers go a long way on the little V8.
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2008 Toyota Tacoma Prerunner SR5 Reg Cab
2.7 4 banger
No mods (yet...)
Fox Lake has been porting our heads for a while with big increases, There was an article about a year ago or so. I was talking to one of our local builders at the track last week and he says he'll port my heads and then show me them on a flow bench, he wants to do custom cams also. I'm thinking this winter I'll tear it down and send them over. I want 12s real bad but I want to say in my same class so no power adders.
The 4.6 2 valve PI heads aren't bad for factory stock - but they do have a LOT of hidden potential. Give Don at Replika Maschinen in Santa Clara a call. The guy may not specialize in Mustangs, but he knows head work like no one else. Read through a couple of articles on his website.
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'99 Mustang GT
KB Twin Screw SC @ 9 psi being installed!
Ported lower manifold, P&P Heads, CP pistons, Manley rods, cryo-treated crank, bored and balanced, etc.etc...
Fluidyne Radiator, C&L 80mm MAF, FRPP 70mm TB, JBA Shorty Headers, Magnaflow Catted X-Pipe, MagnaPack Catback, PA Street/Strip Valve Body, FRPP 3:73 Gears, JMS Chip
Eibach Pro-Kit Springs, Bilstein Shocks/Struts, Hotchkis C/C Plates, KB Chassis Support Kit, MM LCAs, Pirelli P7000SS on Torque Thrust II's and Baer Brakes.
The 4.6 2 valve PI heads aren't bad for factory stock - but they do have a LOT of hidden potential. Give Don at Replika Maschinen in Santa Clara a call. The guy may not specialize in Mustangs, but he knows head work like no one else. Read through a couple of articles on his website.
I just called these guys. I'm gonna head down to their shop and see what's up. They are about 30 miles from me. I'll give you an update when I get back later
I just called these guys. I'm gonna head down to their shop and see what's up. They are about 30 miles from me. I'll give you an update when I get back later
Ok, I can't stop by there today, something came up. But I'll do it next week. The guys sounds really cool.
Matt, if you're really looking for information about flow numbers, read Sean Hyland's 4.6 modular motor book. I've got a copy if you want to borrow it. It's pretty interesting. He says bone stock FRPP heads out flow ported PI heads by quite a big margin. Then when you port the FRPP heads, they're fairly close to stock 4V heads.
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"If a man hasn't found something worth dying for, he isn't fit to live." - Martin Luther King Jr.
Matt, if you're really looking for information about flow numbers, read Sean Hyland's 4.6 modular motor book. I've got a copy if you want to borrow it. It's pretty interesting. He says bone stock FRPP heads out flow ported PI heads by quite a big margin. Then when you port the FRPP heads, they're fairly close to stock 4V heads.
Can you post the flow data if it was in the book on the base PI & FRPP heads? - We continue to have a lot of cylinder head discussions w/o much backup data.
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I'm back - 2002 GT Convertible, auto: Continental Extreme Contacts, KYB GR-2 shocks/struts, Ford Racing "G" springs, Maximum Motorsports camber plates, 3 pc grill delete, Mach I chin spoiler.
Matt, if you're really looking for information about flow numbers, read Sean Hyland's 4.6 modular motor book. I've got a copy if you want to borrow it. It's pretty interesting. He says bone stock FRPP heads out flow ported PI heads by quite a big margin. Then when you port the FRPP heads, they're fairly close to stock 4V heads.
The data I've seen disagrees with this. Even ported non-PI's will outflow an untouched FRPP head.
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2008 Toyota Tacoma Prerunner SR5 Reg Cab
2.7 4 banger
No mods (yet...)
PI heads suck more then I thought 
