502 MPI build up
11-25-2018 | 11:52 AM
#1
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From: Baltic Sea
502 MPI build up
Last ride this season just right back at the harbor i lost a valve seat. Now i am looking for opinions what to do. The motor sits in a 26 Hustler and did 70mls w/ stainless marine exhaust. I am looking for 80. Had a look in older threads, it seems like i can get 500hp with riping down the intake dividers, cam, ecu, exhaust.... I don't think this will do 80 mls in the hustler. Means i'm looking for 525-550hp i think.
The big question is should i do all this with a 18 years old motor or better go with a 525 efi?
What could i add to the 502 wich makes sense? Make it a 540? 7.5% more displacement is not much, even if you look for hp in the 5000 rpm area.
Heads? Are Dart, Brodix, AFR... a big improvement? Mine is not in the best shape anyway but can be repaired as well.
I could open up the throttle body a little bit more if this is a part which makes sense....
tia
Andy
The big question is should i do all this with a 18 years old motor or better go with a 525 efi?
What could i add to the 502 wich makes sense? Make it a 540? 7.5% more displacement is not much, even if you look for hp in the 5000 rpm area.
Heads? Are Dart, Brodix, AFR... a big improvement? Mine is not in the best shape anyway but can be repaired as well.
I could open up the throttle body a little bit more if this is a part which makes sense....
tia
Andy
11-25-2018 | 10:35 PM
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11-26-2018 | 05:15 AM
#10
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From: Baltic Sea
35k is way too much. I mean it doesn´t make sense to try to duplicate a 525 wich is appr. $15k when i have to spend a lot in my old motor. I could sell my 502 for 2k, add 13k and get a 525. Or i rebuild my 502 and try to get close to the 540hp.
540hp seems to be right for 80mls. I totaly agree.
If i put on a double 58mm trottle body, rip down the intake diverters, put in a 525 or similar cam, pistons wich add litte bit more compression rate (we have 95 fuel), a little porting, ecu reprograming, what could i expect?
What would be the next steps? Heads? 540?
540hp seems to be right for 80mls. I totaly agree.
If i put on a double 58mm trottle body, rip down the intake diverters, put in a 525 or similar cam, pistons wich add litte bit more compression rate (we have 95 fuel), a little porting, ecu reprograming, what could i expect?
What would be the next steps? Heads? 540?
