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Originally Posted by Rambocj7
(Post 4382726)
I have 02 sensors... Incidentally I need to retune since it looks like I'm a little lean (just did top ends and some valves were toast ).
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Originally Posted by cobra marty
(Post 4382535)
Here is a good site to compare different Procharger supercharger outputs and pulleys and projected boost. Fun to play with.
http://zero2sixtymotorsports.com/pro...st-calculator/ Unfortunately it doesn't have the M4 supercharger listed. With these big blowers, output is not linear. They are relatively inefficient at lower blower rpm's in making boost. It is a logarithmic increase. So 3/4 rpm is not 3/4 cfm and hence boost. 36,789/48,000 x 2500cfm -- Does NOT equal 1916cfm but something much less. It will also depend on your choice of TB/carb, intake manifold, heads, cam and all their flow ratings. I suspect your pulley combination will possibly yield lower boost numbers than you think especially if all your other components are optimized. No big deal, So you will just need a smaller SC pulley to achieve your boost target. Procharge is playing is safe and very conservative. "Start low, Go slow" and proceed from there. What kind of power do you expect? Predictions--> 555 CID x 1.15hp/cid = 640hp x 8pounds boost(8/16) = 950hp, x 10pounds boost(10/16) = 1040hp if everything is optimized. So how much CFM is needed for 1000hp? When will you be building your engine? My hull currently runs 68 mph on approximately 350 hp.. As far as the engine, I have it built up to a long block. Just have to find the time to finish it.. :) http://i130.photobucket.com/albums/p...pscpm4bkrm.jpg |
Originally Posted by cobra marty
(Post 4382535)
Here is a good site to compare different Procharger supercharger outputs and pulleys and projected boost. Fun to play with.
http://zero2sixtymotorsports.com/pro...st-calculator/ Unfortunately it doesn't have the M4 supercharger listed. With these big blowers, output is not linear. They are relatively inefficient at lower blower rpm's in making boost. It is a logarithmic increase. So 3/4 rpm is not 3/4 cfm and hence boost. 36,789/48,000 x 2500cfm -- Does NOT equal 1916cfm but something much less. It will also depend on your choice of TB/carb, intake manifold, heads, cam and all their flow ratings. I suspect your pulley combination will possibly yield lower boost numbers than you think especially if all your other components are optimized. No big deal, So you will just need a smaller SC pulley to achieve your boost target. Procharge is playing is safe and very conservative. "Start low, Go slow" and proceed from there. What kind of power do you expect? Predictions--> 555 CID x 1.15hp/cid = 640hp x 8pounds boost(8/16) = 950hp, x 10pounds boost(10/16) = 1040hp if everything is optimized. So how much CFM is needed for 1000hp? When will you be building your engine? |
randy your PM box is full
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Originally Posted by abones
(Post 4382870)
randy your PM box is full
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Originally Posted by CNC
(Post 4382864)
F-1X is good to use in place of M-4 for calculating. spot on for me.
Was yours "self contained" or the normal one.. ? |
Normal M-4
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I'm running a little over 12 psi on my 540. 9.2-1 cr. Aluminum heads, M3sc blower. I also converted it to COG drive. Holley HP EFI, computer controlled timing, knock sensor, 504 inner cooler, 100° give or take block/water temp. 91 octane. There's to many variables to be able to give you an off the shelf max boost # for your application.
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^That sounds like a pretty nasty setup!
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Ooh it is!! Lol. About twice the motor my lil 25' Eliminator needs ha-ha. Alex Haxby is THEE MAN!
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1 Attachment(s)
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Every motor is different.
Combustion chamber shape, head material, piston dome configuration, squish height/quench clearance, static CR, cam specs, installed ICL, spark plug heat range. Ignition timing, ambient air temperature, intake charge temperature, coolant temperature. Manitold pressure,, exhaust valve temperature. Piston crown temperature, fuel air ratio. It ALL MATTERS, and ements affect a motor's octane requirements. If you know your actual mathematical static CR, your quench clearance (if it's more than .060" then your octane requirements will be higher), your cam specs, and your (warm) cranking compression, then you can make a pretty good guess. |
I like this spreadsheet...good info.
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Hate to hijack this post but saw that mild thunder runs B&M 420 tried to message but Private Message full sir.
Mr. Thunder saw your post on B&M 420 blower i have same thing in Apache i am purchasing only set at 3-4 lbs now and rev limiter set a 5400 plan on updating to MSD box raise to 5800 and like to run 6-8 lbs boost is your motor similar. mine 588 ci 420 blower chiller 8:1 compression merlin heads. 93 octane tks |
Originally Posted by bajaman
(Post 4758007)
I like this spreadsheet...good info.
Maybe for a non intercooled old school Roots blower.. I ran 10 PSI with my Procharged 555 cid 8.6:1 compression.. worked just FINE :) without "race gas" |
I couldn't see the HP or TQ, what'd it make? (Sorry, didn't see the big "1020" up there. What TQ)
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PS---"Lago Vista? Is that Grandbury behind you? or did you go to Dynatek at Lake Lavon? Who has a dyno at Grandbury?
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Originally Posted by CDShack
(Post 4758191)
PS---"Lago Vista? Is that Grandbury behind you? or did you go to Dynatek at Lake Lavon? Who has a dyno at Grandbury?
Lake Travis :) Dyno belongs to my buddy Bob, who used to run Full Throttle Marine in Spicewood Don't know that this is our "best" run.. But gives you an idea.. Boat ran STRONG.. But I've now moved on to twin "stock" engines.. ;) https://cimg5.ibsrv.net/gimg/www.off...4c03aa0173.jpg |
Thanks for the sheet BI. I'm going to run 10psi on my set up, not near the cubic inches, but it sure gives me motivation to get it done!!!
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