Trying to break 100mph with my spare parts. What do you think?
11-02-2016, 08:53 PM
#31
Platinum Member
I can tell you, I have had these engines on two separate dynos, and both times they made 800hp. One was a DTS dyno, one was a superflow 902, in full marine trim. Neither dyno shop built the engines.
800HP is not alot of power for a forced induction big block. The 900sc, was nothing exotic. A 540 cubic inch, with vintage brodix heads, a low lift solid roller cam, 8:1 static, 1071 blower and lee intercooler. I believe they made 900HP on merc's dyno, with 10lbs of boost. On someone elses dyno, probably a little more. Even if we call them 1.7HP per ci builds....why would that be so insane to think, that a 468, can't make 1.7HP per ci with a blower ?
800HP is not alot of power for a forced induction big block. The 900sc, was nothing exotic. A 540 cubic inch, with vintage brodix heads, a low lift solid roller cam, 8:1 static, 1071 blower and lee intercooler. I believe they made 900HP on merc's dyno, with 10lbs of boost. On someone elses dyno, probably a little more. Even if we call them 1.7HP per ci builds....why would that be so insane to think, that a 468, can't make 1.7HP per ci with a blower ?
11-02-2016, 09:00 PM
#32
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I doubt i'd have lost power, but not sure how much if any I would have gained by going to the 1050's on my little motors.
I changed just to help improve the idle and what not. Between those and the daytona boxes, its nice having some blower engines, that idle at 900rpm in nuetral, 650-700 in gear, and could idle for 30 minutes without loading up a plug, or stall when backing into a slip.
I changed just to help improve the idle and what not. Between those and the daytona boxes, its nice having some blower engines, that idle at 900rpm in nuetral, 650-700 in gear, and could idle for 30 minutes without loading up a plug, or stall when backing into a slip.
11-03-2016, 05:51 AM
#38
I am not opposed to buying some new parts, cam, carbs or whatever. Just mentioning what I had on the shelf. The 502 in my v hull makes over 700hp with the same heads, a smaller cam and a 256 blower with dished blower pistons.
Last edited by snapmorgan; 11-03-2016 at 05:54 AM.
11-03-2016, 06:10 AM
#39
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Why don't you put it together with what you have and see what it does. If it does what you want it to do tweak it from there. Maximize what you have why spend the money if you don't have to... If you go all out now then you don't have any upgrades to look forward to. What happens if you get it together then decide to sell the boat? Now your more money into it. Is the cam you have perfect? No does it leave something on the table? Yes but I don't think that it's so far in left field that it's not going to perform well. The blower will really make up for some of the design flaws in the build. Just spin it a little harder...
11-03-2016, 06:20 AM
#40
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If you put the Brodix heads on it with the 420 blower and the Herbert cam I don't see any reason it won't go over 800hp. Theoretically if the motor is 600hp and you put 7lbs boost to it you will make 900hp. We just did a 540 Brodix BB3 heads 8:71 blower 750 holleys flat tops 7lbs boost it made 950hp. Flat top Pistons. It would have made 1000 but seeing as this was an old worn out 502 block having to clean up oil and engine fragments off the floor in the dyno room wasn't desirable. As cast CNC chamber heads.
