i have an edelbrock 50-100 wet kit laying around i had on a 455. The 81 cutlass im building has a mild 403 with flat top pistons. I will drive this car alot power tour, car shows and road trips. I would like to maybe add the nos kit too it but ive heard its not good for flat top pistons. There are so much miss-information out there. Is it worth it to add the kit for occasional use without prematurly killing the engine. Also im running a holeshot 2100 stall, will that small of a shot effect my stall converter.
nos with flat top pistons?
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Im almost positive that it dosent matter if you have flat tops or dish or dome. It is more what type of piston you have (cast or hyper or forged). From what ive herd 100- 125 is ok for stock bottom end.. but thats what most say. I
had a 84 cutlass with a 403 i prayed a 150 shot many time with no problem but im aslo not gonna say its
100% ok either. That is just what i did.
As for the converter i have no idea lol
had a 84 cutlass with a 403 i prayed a 150 shot many time with no problem but im aslo not gonna say its
100% ok either. That is just what i did.
As for the converter i have no idea lol
If you follow, Edelbrock in your case, guidelines for jetting and read the plugs (look for aluminum/piston on them or electrodes burnt or melted). Most nitrous kits do not have any problems as the jetting is conservative with a margin of safety.
I would put the 100 shot on it if it was mine, being that the 403 has a freaking HUGE piston/bore (bigger than 454 BBC) and a nominal compression ratio. Back the timing down follow the directions. Got to have the fuel to feed it. Did you have any issues on the 455?
How is the 403, fresh build, been running a long time? Use oil? Got decent ignition and wires?
As for the stall, unless you are slicked up and leaving on the spray, the load on the converter is not a concern.
For the record, most nitrous failures I have seen were because of the tuning or not following the tuning from the manufacturer. People think there is some voodoo, its pretty simple. Good connections, no teflon tape, good relay and switch, fuel and timing. Its the guy that goes to the BIG jets because he didn't wanna' buy some or a buddy had them or his motor was not really designed to withstand an additional 250 horsepower.
As for pistons, black86442 is right on about the type of piston, cast-forged-hypereutectic, the stronger the piston the more it will take. There has been some debate, but, hypereutectic pistons will shatter with a lot of nitrous. This has to do with the is being denser than cast, and harder, when nitrous ignites in the combustion chamber the harmonic wave causes them to break like glass. I don't have a magic number for when it occurs, like a certain HP level. The failures I seen all had a lot more than 100 HP on them, almost double, and all were high compression as well.
I would put the 100 shot on it if it was mine, being that the 403 has a freaking HUGE piston/bore (bigger than 454 BBC) and a nominal compression ratio. Back the timing down follow the directions. Got to have the fuel to feed it. Did you have any issues on the 455?
How is the 403, fresh build, been running a long time? Use oil? Got decent ignition and wires?
As for the stall, unless you are slicked up and leaving on the spray, the load on the converter is not a concern.
For the record, most nitrous failures I have seen were because of the tuning or not following the tuning from the manufacturer. People think there is some voodoo, its pretty simple. Good connections, no teflon tape, good relay and switch, fuel and timing. Its the guy that goes to the BIG jets because he didn't wanna' buy some or a buddy had them or his motor was not really designed to withstand an additional 250 horsepower.
As for pistons, black86442 is right on about the type of piston, cast-forged-hypereutectic, the stronger the piston the more it will take. There has been some debate, but, hypereutectic pistons will shatter with a lot of nitrous. This has to do with the is being denser than cast, and harder, when nitrous ignites in the combustion chamber the harmonic wave causes them to break like glass. I don't have a magic number for when it occurs, like a certain HP level. The failures I seen all had a lot more than 100 HP on them, almost double, and all were high compression as well.
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