502 MPI change to Carb
#1
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502 MPI change to Carb
what should be my checklist if i am interested in changing my EFI over to a carb setup?
i have a 99 502 with 230 hours. I am interested in making around 600hp.
I have cheap access to a whipple for a carb setup -- hence my thoughts on just switching over to a carb setup.
does any of the internals of the engine need to change?
distributor?
i know i need new intake and obviously a carb to go with this.
just trying to get a real world idea on what this would cost me.
intake and carb i'm guessing 1200???
can i sell my EFI setup? whats it worth?
thanks guys!
just trying to brainstorm here
i have a 99 502 with 230 hours. I am interested in making around 600hp.
I have cheap access to a whipple for a carb setup -- hence my thoughts on just switching over to a carb setup.
does any of the internals of the engine need to change?
distributor?
i know i need new intake and obviously a carb to go with this.
just trying to get a real world idea on what this would cost me.
intake and carb i'm guessing 1200???
can i sell my EFI setup? whats it worth?
thanks guys!
just trying to brainstorm here
#2
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Your EFI setup is worth about a 1000 on ebay.
The Whipple should come with an intake with intercooler built in. If not I don't know that I would change over to it.
Also you should pull heads and get a good single angle valve job done, switch over to PC seals for the valves and install fel-pro LMS head gaskets with studs for best reliability. Carb should be an 825 that is boost referenced. Expect 550-600 hp at 6 lbs boost.
Might want to add a different cam while in there to guarntee the 600hp.
The Whipple should come with an intake with intercooler built in. If not I don't know that I would change over to it.
Also you should pull heads and get a good single angle valve job done, switch over to PC seals for the valves and install fel-pro LMS head gaskets with studs for best reliability. Carb should be an 825 that is boost referenced. Expect 550-600 hp at 6 lbs boost.
Might want to add a different cam while in there to guarntee the 600hp.
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Last edited by Smitty; 11-12-2007 at 02:47 PM.
#4
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As long as the stock exhaust goes out thru the transom, you will be okay. Could you get more power with better exhaust-sure, but not necessary. If it goes thru the prop I would say do not change to the blower.
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#5
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yes it is thru hull.... i'm surprised more people haven't chimed in with their experiences on this conversion. i've heard of a lot doing it.
i'd really like to know what the gotcha's are.
i'd really like to know what the gotcha's are.
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I don't think any engine builder would use stock exhaust if building a motor. There are several problems associated with stock exhaust in a modified motor. If I were installing a blower I would at minimum add exhaust and head work like good rockers and minimal valve job. Not because it would make more power but because it might even last all summer.
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It sounds as if you're making lots of changes and there is a lot to consider. Perhaps upgrading to a better breathing exhaust system MAY not be absolutely necessary, but you will only bennifit from it so, I would really think twice about it---especially in light of any reversion!---and especially with a stock cam or the wrong cam. An aftermarket exhaust manifold system would obviously breath better and give more HP over the stock Merc stuff---especially with a blower it needs to breath! Stainless Marine, Dana, or GIL system would be adaquate....preferably with a ONE PIECE tailpipe that goes all the way through the hull/out the transom.
Do youself a favor and call "RMBuiler"/Bob Madara of Marine Kinetics in N.Y. (585) 564-8583. He will take all your components into consideration and make sure you have the correct combination for your application and he will pick the correct cam for you. Bob is a stand up guy with years of experience, very intelligent and has helped a ton of people on here. Have fun.
Do youself a favor and call "RMBuiler"/Bob Madara of Marine Kinetics in N.Y. (585) 564-8583. He will take all your components into consideration and make sure you have the correct combination for your application and he will pick the correct cam for you. Bob is a stand up guy with years of experience, very intelligent and has helped a ton of people on here. Have fun.
Last edited by KAAMA; 11-14-2007 at 06:58 AM.
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thanks for the advice -- i'm trying to do this as inexpensively as i can. the only reason i'm thinking of going the whipple is because i have easy(read cheap) access to one.
other wise i'd probably go the tyler crocket route or a pro-charger.
i figure i can do the whipple and most of the work myself -- and only spend about 2 grand -- that is a whole lot less than the 7grand it would take for crocket or a rebuild.
trust me -- i wish i wasn't working with limited funds -- but it is what it is.
other wise i'd probably go the tyler crocket route or a pro-charger.
i figure i can do the whipple and most of the work myself -- and only spend about 2 grand -- that is a whole lot less than the 7grand it would take for crocket or a rebuild.
trust me -- i wish i wasn't working with limited funds -- but it is what it is.