Hello all-my new to me 1993 251 has a carbed 502, has Edelbrock carb and intake, Corsa exhaust and Merc exhaust manifolds. Are there any perfomance mods that can be done without opening up the motor? Just looking for a little extra power, Might consider a supercharger if it doesn't brakd the bank. Thanks
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502 Performance Mods
- Thread starter glenncal1
- Start date
yellowfiero88
Well-known member
A nice set of headers will help a lot over manifolds. From there I would do the supercharger.
Gimme Fuel
Well-known member
Yea....I agree with YF.....try adding a better ignition like a MSD box/setup.
How many hours are on the motor? if they are high, you might want to freshen it up before you add a blower. Besides, a blower will work much better if the cam profile is ground for it. A roots style blower for your motor wouldn't be too bad to bolt on if you are keeping it mild. I would make sure your engine has a forged rotating assembly and pistons first.....it should already. If you are keeping mild boost, your stock compression ratio should be fine. If you are going wild, then good forged and dished pistons would be ideal. Also, if doing a wild blower setup, your piston and rig gap clearances need to be increased due to the extra heat in the cylinder.
And when supercharging, intercoolers can be pricey but they add a bunch of more powerwithout any other mods. Blowers make a lot of heat.
How many hours are on the motor? if they are high, you might want to freshen it up before you add a blower. Besides, a blower will work much better if the cam profile is ground for it. A roots style blower for your motor wouldn't be too bad to bolt on if you are keeping it mild. I would make sure your engine has a forged rotating assembly and pistons first.....it should already. If you are keeping mild boost, your stock compression ratio should be fine. If you are going wild, then good forged and dished pistons would be ideal. Also, if doing a wild blower setup, your piston and rig gap clearances need to be increased due to the extra heat in the cylinder.
And when supercharging, intercoolers can be pricey but they add a bunch of more powerwithout any other mods. Blowers make a lot of heat.
mkhammer
Well-known member
This will wake up your engine with noticeable HP and torque gains and is reasonably priced
Dana Marine flow torque exhaust and a custom curved Performance distributor will add 40+ hp to your engine.
Link to distributor:
http://www.mkhammer.com/dui-marine-...pm-15-to-40-hp-gains-over-stock-p-302472.html
Link to exhaust theses will work with your Corsa :
http://www.mkhammer.com/dana-flow-torque-level-exhaust-kit-short-p-302659.html
Dana Marine flow torque exhaust and a custom curved Performance distributor will add 40+ hp to your engine.
Link to distributor:
http://www.mkhammer.com/dui-marine-...pm-15-to-40-hp-gains-over-stock-p-302472.html
Link to exhaust theses will work with your Corsa :
http://www.mkhammer.com/dana-flow-torque-level-exhaust-kit-short-p-302659.html
Attachments
lcboater
Well-known member
Go with a procharger.It will give you plenty of power and is intercooled so it is easy on the mota. CP has a big sale on prochargers right know or give jason kunkel a call and he can sell and install it for you.
mkhammer
Well-known member
I get my prochargers from the same place CP does " Procharger" Cp does not have them in stock they have to get them from Procharger like anyone else.
I have built 11 engines with this kit and can give you tech advice if you do it your self. You will have to upgrade your fuel system most parts for the fuel system come in the kit.
I can offer the same deal for $100.00 less
Site loyalty is great isn't it.
http://www.mkhammer.com/procharger-...6.html?zenid=e853be84e5027db8f2dc86a668c7d165
I have built 11 engines with this kit and can give you tech advice if you do it your self. You will have to upgrade your fuel system most parts for the fuel system come in the kit.
I can offer the same deal for $100.00 less
Site loyalty is great isn't it.
http://www.mkhammer.com/procharger-...6.html?zenid=e853be84e5027db8f2dc86a668c7d165
Attachments
Last edited:
winter
Active member
I disagree on tossing the Edelbrock carb. I had my 468 dyno'd with literally less than 2 hp difference between a well tuned Holley and my Edelbrock. I suppose there are some applications in which a Holley will work notably better, but not on anything stock or semi-close to it. A set of good manifolds will help just make sure you size them correctly to what you may plan to do inthe future horsepower-wise. Most basic manifold kits handle 600-700hp regardless. Headers are big $$$ and may produce a bit more hp on a stock motor, but prob. not worth the coin until you go with big power. Personally, I'd freshen up the ignition or update it, install some Imco or EMI manifolds and leave it alone from there. Once you have enough $$$, then dig into the motor and do the internals, cam and blower.
Big Red
Well-known member
Winter your biggest problem with a e-brock carb is the fuel bowls are to small. The tunning on a E-brock takes to much time, the carb is a home owner carb and only good for resale for starting and idleing.
Winter please post any performance engine builder that uses a E-brock other than E-brock. CASE CLOSED
I would really like your dyno run pulls posted and what size e-brock did you use and what holley. And please do not give me tex book BS that you always post. Just post your findings with a dyno
Winter please post any performance engine builder that uses a E-brock other than E-brock. CASE CLOSED
I would really like your dyno run pulls posted and what size e-brock did you use and what holley. And please do not give me tex book BS that you always post. Just post your findings with a dyno
mkhammer
Well-known member
Holley's or same design are highly tunable and I wouldn't consider using anything else in a performance application.
The Edelbrock carb is for the most part dependable with the Rochester type design.
I have no use for them. I tried one on a 502 carb changed it to a 750 Holley upped the secondary jets 2-sizes, scraped the thunderbolt ignition, put a Performance marine HEI on it and gained 500 RPM. Imco powerflows were already on.
The Edelbrock carb is for the most part dependable with the Rochester type design.
I have no use for them. I tried one on a 502 carb changed it to a 750 Holley upped the secondary jets 2-sizes, scraped the thunderbolt ignition, put a Performance marine HEI on it and gained 500 RPM. Imco powerflows were already on.
winter
Active member
For starters Mr. Red, wanna tell me what BS i'm posting that has your panties all bunched up? I've never BS'd anyone on here and don't have to prove numbers to anyone. I have the dyno sheet for the edelbrock, but the builder didn't bother to print the holley as it was his test unit and he only did it for comparisons sale.
The truth is this: Most everyone on here drives their boat at something short of WOT 95% of the time, so max hp. figures shouldn't matter as much as start-up, idle, accell. and part throttle driveability. On a stock or fairly close to stock motor, holleys advantage is minimal. Next year when I consider a motor with a lot more smoke, then I'll be looking into a Holley product. Besides, edelbrocks are a good deal cheaper.
The truth is this: Most everyone on here drives their boat at something short of WOT 95% of the time, so max hp. figures shouldn't matter as much as start-up, idle, accell. and part throttle driveability. On a stock or fairly close to stock motor, holleys advantage is minimal. Next year when I consider a motor with a lot more smoke, then I'll be looking into a Holley product. Besides, edelbrocks are a good deal cheaper.
winter
Active member
Well my goodness, i suppose my own eyes must have deceived me looking at the numbers on the screen but only asking to have printed the numbers that mattered.... the ones for the motor i'm taking home. I don't suppose YOU have any comprehensive dyno sheets on a similar motor running both a Holley 750 and an Edelbrock 750 back to back do you? Figured.
Big Red
Well-known member
Enjoy your Edlebrock winter, My only proof was time slips at a drag strip from 3 different engines after a carb swap. Plus the low performace and rpm drop on a engine when useing a E-brock on two different boats.
I guess you may be right if a man does not know how to work on a carb he is better off useing a E-brock then a Holley. Also the E-Brock is cheaper and he will not cry about the price even though he wants performance.
And if you used a Holley Vacuum carb everybody knows any vacuum Holley carb is useless.
I guess you may be right if a man does not know how to work on a carb he is better off useing a E-brock then a Holley. Also the E-Brock is cheaper and he will not cry about the price even though he wants performance.
And if you used a Holley Vacuum carb everybody knows any vacuum Holley carb is useless.
yellowfiero88
Well-known member
I don't know how to work on a carb so I use edelbrock! I enjoy the way it runs but feel I can get more out of a holley. My next one will be injected 
Gimme Fuel
Well-known member
I don't know how to work on a carb so I use edelbrock! I enjoy the way it runs but feel I can get more out of a holley. My next one will be injected
About the only carbs I know how to work on and tune are on small outboards, lawn mowers, and snowmobiles.....haha. But I understand EFI systems really well.......go figure. That is why I run an injected motor. If you don't like the way your motor is running....just punch a few keys on the laptop. Problem solved!
winter
Active member
Well, Red speaks the truth there, i'm not a carb genius by a long shot but i did spend less than an hour on the lake last year with the master jet kit and dialed the edelbrock in until it was spot on. But i'll say again, i wouldn't use it if i was drag racing or if i had a motor with much more than the hp i have now. Drag racing is WOT. And the intricacies of a big motor with lots of cam overlap and high rpms will tax an edelbrock quite a lot. My personal fav. is my 900 ultra HP on the 540 in the camaro. It starts, idles and goes like stink at WOT. But it is not happy in the least at cruise.