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Wiseco choice help |
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Amc wannabe 
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Joined: Jan/08/2014 Location: DE Status: Offline Points: 86 |
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 Topic: Wiseco choice helpPosted: Jan/23/2019 at 11:24am |
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will these pistons allow me to stay with pump gas on stock heads and edelbrock heads down the road?
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BassBoat
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Joined: Aug/29/2008 Status: Offline Points: 1719 |
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Posted: Jan/23/2019 at 2:05pm |
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roughly 10.25 to one with stock heads and 10.75 to one with Edelbrock heads. Internet is not helping me today.... but as far as I can tell those pistons are the flat top pistons with 8.6 cc valve reliefs. So NOT automatically pump gas friendly. With a big cam, 245 or 250 intake duration at 0.050 you would be just fine. with the 21 cc dish version, 8.9 or 9.3 to one, I would be 100% confident you could run pump gas. Pump gas means 87 to a few people, 91 max in some states, 93 where I am so that is a factor also.
BB
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Amc wannabe
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Posted: Jan/23/2019 at 2:27pm |
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let me clarify. Pump gas to me is 93. Would that help the flat top?
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BassBoat
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Posted: Jan/23/2019 at 7:09pm |
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What cam do you plan to run?
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Amc wannabe
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Posted: Jan/23/2019 at 7:14pm |
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I want a very aggressive cam, but it still needs to be streetable. I’m young and an aggressive ride doesn’t bother me that much yet. I was going to talk to a cam company to try to figure out what’s best for me but don’t want to get a static compression that will force me into race gas. I’m looking to find that thin line between a street and race cam.
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Buzzman72
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Joined: Sep/15/2009 Location: Southern IN Status: Offline Points: 2725 |
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Posted: Jan/23/2019 at 7:59pm |
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Where in the RPM range do you want your power band? THAT will decide your cam, and cam choice/power band should determine your gearing and tire size. If you want a cam that's a monster from around 850-5000 rpm, check out Howard's 310101-12 cam. If you want your power higher in the rpm range, choose a different cam. If you choose a cam that doesn't come in until 3000 rpm, you have to choose a gear set that takes advantage of that...numerically higher gears.
My advice--and I'm no pro--is to sit down with a notebook and a cheap calculator and figure out just what you want your car to be/do. EXAMPLE: My project is a 52 International pickup. Stock, with its 2850 pounds, 90 HP six and 3.73 rear gears and 29" tires, would run 70 mph. My objective is to make it a highway cruiser with some "oomph" when you nail it at a stoplight. So I'm planning to build my AMC 304 to about 280+ HP. That puts it into the 10 lbs per HP bracket that defined the '60's muscle cars. I'm talking mild port work, stepping up to 1.84 intake/1.5 exhaust valves, something like 9.5 or so static compression ratio, the aforementioned Howard's 310101-12 cam, and an air gap intake. (See jcisworthy's 304 build, dialed back just a touch.) I plan to run an overdrive automatic, either a tweaked 200-4R or an AW-4, for the overdrive.My aim is to end up with gearing/tire size to achieve 78 mph @ 3000 rpm in OD with torque converter lockup, same as Maw's lowly PT Cruiser. That makes 2000 rpm 52 mph, and 2500 is 65 mph. Plus the acceleration through 1st, 2nd and 3rd should be fun, too. I have a disc brake Explorer 8.8 with 3.73 gears to put the power to the pavement. Just an example to work with. Your mileage (and needs/wants) may vary. But if you can't put down on paper what you want to achieve, it's damn hard to get there. Take a deep breath or six, and sit down, pencil and paper in hand, and figure out EXACTLY what you want. It's always easier to make a road map from point A to point B if you know where point B is. Good luck!
Edited by Buzzman72 - Jan/23/2019 at 8:05pm |
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Buzzman72...void where prohibited, your mileage may vary, objects in mirror may be closer than they appear, and alcohol may intensify any side effects.
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PHAT69AMX
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Joined: Jul/07/2007 Location: West Virginia Status: Offline Points: 5919 |
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Posted: Jan/23/2019 at 8:09pm |
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Maybe consider this Lunati AMC Cam...
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Amc wannabe
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Posted: Jan/23/2019 at 8:22pm |
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I would like the power band to be something like 2k-6k, nothing past 6.5k. Hydraulic flat tappet most likely. I want it to have midrange road manners and pull but still be a heck of a rocket up top, the low end doesn’t matter much as long as it will idle without help. Have a tko 600 already so it’s stick. Idk if putting that kinda setup with that piston compression with 93 octane will be detonation waiting to happen, but as with most people I want to avoid ordering a custom piston if I didn’t have to pay that extra. Don’t mind paying it at the pump.
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Ken_Parkman
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Posted: Jan/23/2019 at 9:15pm |
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I'm going to be a mile a**hole here. Don't use a flat top. You far far better off optimizing the combination for your planned power range instead of shooting for a flat top piston and trying to detune to make it work. With a hydraulic the lifters are an issue at higher rpm. Stick with ~225 degrees intake sorta like the one Phat suggested and it will suit the street power band you are talking about. For compression it also depends on your plans. If it is a real street car that gets driven a bunch and may get caught in a traffic jam on a hot day be conservative, about 9.5 with an iron head, a little more with an Edelbrock. If it is a toy only and you can control the operating conditions you can bump it a 1/2 point.
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WesternRed
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Joined: Aug/03/2010 Location: Australia Status: Offline Points: 5799 |
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Posted: Jan/23/2019 at 9:46pm |
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Wiseco should have a dished piston in that same line that will bring the compression down for you, seems that not long ago Summit had the flat tops are around $450 but since they are back up to the regular price, there is no advantage unless you want the compression.
You also need to clarify which heads your are using since the factory heads come in 50, 58 and 63 cc. If you took the 58 cc heads and did a bit of chamber work on them, you would end up with something like 63 cc and that might help bring the compression down just enough, maybe 10.0:1 once you measure everything properly.
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I've finally given up drinking for good...........now I only drink for evil.
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