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| Mac Winter 76XB351GS |
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Gday all,
I have a stroked, balanced, forged 383 clevo and Im at the stage of decking the block. We have measured it up and I can have anything from 8.6 to 9.9 CR. Im thinking about 8.9 - 9.0. I have a powerdyne that I have upgraded the belt and bearings to handle 60 000 internal revs instead of the usual 36 000 stock, so it will make about 12+ PSI if I gear it up. Just after a few opinions on what boost I can expect to run with this kind of set up before detonation sets in. Im looking at 8pound, does this sound about right? Cheers, Matt
_________________ 76XBGS, 383c, custom crow cam, 4V p&p heads, Isky SS Valve+springs, extractors, 2.5"twins, MSD Ignition, Edelbrock intake, Forged bottom end, Barry Grant 750DP, thermo, discs, toploader, Holley fuel pump, SUPERCHARGED! |
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| Mac Winter 76XB351GS |
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I know I asked nearly the same thing only a little while ago bit the CR has changed since then and the intercooler idea is out the window for now. I wanted a little more CR to up performance lower in the rev range.
_________________ 76XBGS, 383c, custom crow cam, 4V p&p heads, Isky SS Valve+springs, extractors, 2.5"twins, MSD Ignition, Edelbrock intake, Forged bottom end, Barry Grant 750DP, thermo, discs, toploader, Holley fuel pump, SUPERCHARGED! |
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| schnoods |
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8psi Seems about right.
To be able to get 12psi out of a powerdyne is one thing, but to get it in the volume for the 383 requires is a big ask. Reliably 8psi on around 9-9.5 compression is ideal. Powerdynes are known to be air heaters when trying to boost em over 10psi. And being a sealed unit too they can wear a fair bit. If you want it to boost up a little earlier a smaller pulley would help, but at the same time if you are revving it out past 5.5-6 then generally the speed that the internals are subjected to will great increase the wear. I'd be starting between 8 pounds and trying to find a good trade off point.
_________________ Because of Beer, Thirst is a Beautiful Thing! |
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| Mac Winter 76XB351GS |
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Thanks, I am shimming the impeller and venting the case for a little more cooling. Also using 450 deg grease on the high speed bearings instead of the std 250deg. From what Iv heard it should put out atleast the 8psi I want, all day long with no complaints.
_________________ 76XBGS, 383c, custom crow cam, 4V p&p heads, Isky SS Valve+springs, extractors, 2.5"twins, MSD Ignition, Edelbrock intake, Forged bottom end, Barry Grant 750DP, thermo, discs, toploader, Holley fuel pump, SUPERCHARGED! |
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| EBXR8380 |
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If you put a 30mm restrictor on inlet you'll be able to reliably run 10 Lb easy....
Imo the blower is alittle small...
_________________ As in ZOOM 126 edition |
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| Mac Winter 76XB351GS |
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Thanks. I was thinking of playing with the intake piping a little before getting it welded up. I would have bought a vortech if I had've known this was a BD11a and not the gear driven unit...ebay...pfffft
From what I have heard from the states the mods I am doing will give me 8psi no worries. Thats all Im after for the moment. If I want more in the future I will be getting a vortech and having to lower my CR. I found this interesting...dont think I will be doing it though. http://cgi.ebay.com/ebaymotors/Super-Po ... 0134703843 I'll gear it up and see what kind of boost I can get out of it just for interests sake, but I only plan to use 8psi. I'll watch the intake temp to see when it starts to heat up the charge too much. Wish I could find a main/crank 6 rig/groove pulley that is bigger than 6"...
_________________ 76XBGS, 383c, custom crow cam, 4V p&p heads, Isky SS Valve+springs, extractors, 2.5"twins, MSD Ignition, Edelbrock intake, Forged bottom end, Barry Grant 750DP, thermo, discs, toploader, Holley fuel pump, SUPERCHARGED! |
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