408 stroker compression? - Mustang Evolution

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Old 03-04-2013, 12:12 PM   #1
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408 stroker compression?

I currently built a 408 windsor i wanted to get the compression high but with this stroker i bought, it only had flat top piston option or dish. With flat tops my compression ratio is 11.7:1. I built this engine to race no street time with this. I need a second opinion if i should order a set of dome pistons from diamond pistons ( which i found the only place that offers them) which will make my compression 13.8:1 with a 62cc combustion camber, and the heads are dart pro1 cnc 225s is it worth spending the money for higher compression???
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Old 03-04-2013, 12:34 PM   #2
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I would stick with flat tops unless you plan on running race fuel only. If so it maybe worth getting the domed. But even then you will need a good tune to run that high of compression which I'm sure you know, just wanted to throw that out there.
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Old 03-04-2013, 01:13 PM   #3
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Yeah im planning on running race fully the engine i goin in a 89 fox that is tubbed but i just wanted sum opnions thanks!
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Old 03-04-2013, 02:24 PM   #4
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13.8:1 just seems really high and dangerous. But if you can make it run good with that much compression its probably worth a good amount of hp. That's just a little more radical than I'm used to. Lol
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Old 03-04-2013, 02:43 PM   #5
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Yeah thats what i firgured also i know most race engines r like at 12.5:1- 13:1 at the most but i want to just to get all i can out of the engine bc it gots good heads and solid roller high lift and high duration cam, i just wanna take advantage of my heads and cam i got bc i wanna run all motor
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Old 03-04-2013, 03:03 PM   #6
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Yeah thats what i firgured also i know most race engines r like at 12.5:1- 13:1 at the most but i want to just to get all i can out of the engine bc it gots good heads and solid roller high lift and high duration cam, i just wanna take advantage of my heads and cam i got bc i wanna run all motor
That thing is gonna be a n/a beast for sure.
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Old 03-04-2013, 03:43 PM   #7
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One more thing. Domed pistons are really gonna narrow your cam choice down. If you have a big cam already you probably won't have any ptv clearance.
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Old 03-04-2013, 03:46 PM   #8
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This is the 408 i built idk if the pic came out lol

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Old 03-04-2013, 03:49 PM   #9
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Puuurrrttttyyy...
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Old 03-04-2013, 03:52 PM   #10
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I degreed the cam to the cam card nd it worked and also the valve reliefs r .270 intake/.200 exhaust and the dome pistons i was looking at have .300 intake / .260 exhaust nd the valve pockets r 2.15 intake/ 1.70 exhaust im pretty sure they will work but im gonna call it in to check and double check bc i dont wanna buy sumthin thats not gonna work

---------- Post added at 04:52 PM ---------- Previous post was at 04:50 PM ----------

Thanks! Yeah i did alot of research before i built it, nd if i can get more compression i wont need nitrous nd have a pretty stout motor =)
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Old 03-04-2013, 03:53 PM   #11
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Quote:
Originally Posted by Adam331Fastback
This is the 408 i built idk if the pic came out lol
Looks good man I'd say there's gunna be some camaro guys that hate you at your track hahaha
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Old 03-04-2013, 03:54 PM   #12
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Heres another the only other thing is i want shaft mounted rockers

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Old 03-04-2013, 04:10 PM   #13
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Originally Posted by Adam331Fastback
I degreed the cam to the cam card nd it worked and also the valve reliefs r .270 intake/.200 exhaust and the dome pistons i was looking at have .300 intake / .260 exhaust nd the valve pockets r 2.15 intake/ 1.70 exhaust im pretty sure they will work but im gonna call it in to check and double check bc i dont wanna buy sumthin thats not gonna work

---------- Post added at 04:52 PM ---------- Previous post was at 04:50 PM ----------

Thanks! Yeah i did alot of research before i built it, nd if i can get more compression i wont need nitrous nd have a pretty stout motor =)
No one including the manufacture can give you an exact yes or no if it will work. The only for sure way is the clay way. Did you have it running the way it was yet? My neighbor has a similar setup and pushes 700+ hp n/a!! Except hes poked and stroked to 427.
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Old 03-04-2013, 04:24 PM   #14
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No its not running yet
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Old 03-04-2013, 04:28 PM   #15
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What size carb do you have? With the compression you are trying to run I would recommend a wideband a/f gauge. Have you seen my wideband setup in my albums? It's in my custom radio delete. I installed a multimeter next to it to keep it calibrated and add the accuracy of digital. You can search "how to calibrate a wideband". If you can't find it let me know and I can search it up if your interested. The multimeter was 4$ and works great. It's a gauge for my gauge.lol
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Old 03-04-2013, 04:57 PM   #16
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Its a 1050 and yeah man i really want put a wide band a/f gauges but i wouldnt know which one????
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Old 03-04-2013, 05:02 PM   #17
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The one I have was the best deal I could find. Close to 200$. It's an AEM.
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Old 03-04-2013, 05:07 PM   #18
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Do you got a link so i can check it out?
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Old 03-04-2013, 05:15 PM   #19
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Do you got a link so i can check it out?
Yeah. I'm gonna hop in the shower and I will get you some links. For the wideband and my thread for the calibration delay.
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Old 03-04-2013, 05:56 PM   #20
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Ok cool man i appreciate it!
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Old 03-04-2013, 06:01 PM   #21
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Ok, here is my write up I did on the calibration mod.

Here is the AEM wideband gauge. I don't think you will find any cheaper unless they aren't complete. This comes with everything you need including the wiring, sensor, o2 bung, and gauge.
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Old 03-04-2013, 06:04 PM   #22
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If you notice on my write up thread I have a excel sheet that I use to keep track of my a/f and what I did for corrections. This way when wheather or conditions change I can refer back to it as needed. If you want I can get a copy of that and email it to ya when ready?
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Old 03-04-2013, 06:13 PM   #23
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Yeah man sure thing my email is adam_franco2008@yahoo.com
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Old 03-04-2013, 06:19 PM   #24
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OK I will send it now. It may have my first cou[le logs in it. But you can just erase those. I killed my lifters right about after that little logging I did. I have change jets also but haven't logged it yet. Anyways I will send it off now.
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Old 03-04-2013, 06:29 PM   #25
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ok I sent you the tuning log sheet. Its pretty handy and organized to keep track of your tuning.
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Old 03-04-2013, 06:31 PM   #26
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Cool man thanks! Yeah man ill look into i thanks
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Old 03-04-2013, 06:33 PM   #27
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Cool man thanks! Yeah man ill look into i thanks
Your welcome.
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