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View Poll Results: Super or no super
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  #1  
Old 01-09-2015, 02:27 AM
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So I'm reaching the final stage of my engine build and I have a small issue, I'm about to order a full rotating assembly for my engine but I don't know for sure if I want to go with my original plan of a NA 408 10.1:1 compression stroker (mopar m1 intake, mopar heads with stage 2 porting, comp cams valve train, Holly 880 polished TB and a bunch of other stuff but those are the main things) The engine is going to be fully port matched and blueprinted and race balanced either way with 2.02 inch intake valves for a theoretical max HP of 551 at 6200rpm (according to all the math I've done, though realistically its going to be in the high 400s unless I'm very lucky). If I do go with the super I will use a low comp assembly with the logic that the engine should generate even more TQ early on allowing a more radical cam so that top end can be maximized. However I don't know if this will be the case with this setup as the stroker already should be outputting more TQ at 2000 than my current engine does at its TQ peak. Advice and potential complications would be welcome, its a centrifugal super btw.
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Old 01-09-2015, 04:10 AM
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My main source,http://www.strokerengine.com/StrokedEngines.html
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Old 01-09-2015, 12:16 PM
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The long arm and a supercharger are going to wiggle the main caps. Is the bottom end all up to the task?
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Old 01-09-2015, 05:07 PM
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It should be, arp bolts all the way with a medium level block girdle
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Old 01-09-2015, 05:28 PM
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I don't know what medium level is but if the girdle is not tight to the caps, only shimmed/spacered at the studs it will not likely stop the cap walk, except at low boost pressures, and at that I wouldn't bother with the charger in the first place IMO.
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Old 01-09-2015, 05:53 PM
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Well its going to be done one of three ways, low comp high boost, high comp low boost (5-7psi) or no super
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Old 01-10-2015, 06:42 PM
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Anyone? I'm using a short runner intake and I feel like this will kill low end a bit and that even a low psi super would cure it, and can someone chime in as to if I can run a more HP focused cam if a super is present?
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Old 01-12-2015, 10:03 AM
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Low compression/higher boost will produce more power than high comp/low boost. The snag to higher boost is that as boost increases, more heat is generated in the mixture, which will begin to work against you at higher boost levels. This is why you see intercoolers (yes, on supercharged engines, not just turbos) used pretty much above 14psi, give-or-take. For a street setup, the hot ticket would be around 8.5 compression with 14psi (w/o intercooler) or upwards of 20psi (with intercooler). Cam should be optimized for max power in the upper rpms, but being a long arm stroker, plan on peak use in the 5,000's, only occasionally tapping 6,000rpm (for long-term durability's sake...that and long arm strokers tend to not make best power at extreme rpm when compared to short-stroke high rpm screamers). Botton-end should be fine, though, at 20psi, I'd be thinking of additional main cap support even below 6,000rpm. It becomes cheap insurance when you look at what else is at risk if it were to let go. Being a long-arm stroker, with a supercharger and the displacement you'll have (especially when any boost is factored in), you're gonna have gobs of low rpm power, so you're okay pushing the cam towards upper rpm power. True, the short runner intake will reduce low-end power in a normally aspirated setup, but if you look at traditional supercharger setups, they have almost no runner length. The pressurized mix tends to erase that issue.

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Old 01-12-2015, 02:58 PM
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thanks alot gen1dak! awsome advice as always, its was going to be intercooled regaurdless of boost and after what you said i think im going to do a 8 psi setup with a high range cam and simply use the super to provide better low end in conjunction with the stroker so i can have the wide powerband i wanted with still having high end. What's a good redline in your opinion? full forged rotating asmb with arp bolts for everything and comp cams best pushrods, lifters, rockers and springs. I would like somewhere that will make sure that fuel cutoff occurs about 200 rpm before the "real" redline, thanks again
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Old 01-12-2015, 06:59 PM
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I just wouldn't push much past 6 grand with those longer arms. They do their best work at slightly lower speeds. Try turning too high and you're making noise, but losing power trying to sling those arms so fast (higher piston speeds, the inertia of it all). Just no point in it.
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