thinking of building a 4.8 (help please)
02-27-2012, 11:12 AM
#11
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Mangled - I understand the giving up ci issue, but why do you think it will not do well pulling? Everyone is spinning the guts out of these to get the power, Why cant i do it with a sled hooked if i can keep the rpms up?
Joey Thanks for your input, right now we are going the cheaper way, to see how it works out.
Again thanks for everyones input
Joey Thanks for your input, right now we are going the cheaper way, to see how it works out.
Again thanks for everyones input
02-27-2012, 11:55 AM
#13
It would be interesting and could be done I guess with a snail on it. Makes me think of this build.
SCREAMIN SEMEN GMC 5.3 Turbo Swap - LS1TECH
SCREAMIN SEMEN GMC 5.3 Turbo Swap - LS1TECH
02-27-2012, 12:05 PM
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Brain fart_ are you agreeing with me or saying give the 4.8 a shot LOL. I just feel a 4.8 will be a huge challenge to make the power, TQ esp where it needs to be. Spinning a engine to 6500 is much easier when it doesn't have 5k behind it. In racing the little cubes can do as well as the big ones, but when it is pulling, TQ is king.
02-27-2012, 05:34 PM
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I am trying to do something different and see what happens. Everyone around here is pulling small block carb setups. I wanna build something different and a 4.8 is good for the cost of an engine. My truck is pretty well built chassis wise and works good with only a 355sb. Also looking for a new gen truck that if I wanted to I could put it into that and pull. The biggest engine I pull against is a built 424ci ford but that guy has more money than anyone. Right now I am just playing to see what works and what doesn't. Thanks for all your input.
02-27-2012, 05:54 PM
#16
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If you're gonna run the small engine then gearing is going to be extremely important because you're going to need all the help you can off the line so you can get into you upper rpms where your power is. A stock 4.8 doesn't really start moving until 2500 anyway, by 3000 they're making good power but until 2500+ they're gutless.
02-27-2012, 08:23 PM
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Yes, as mentioned I am leaving the line around 3500 rpm, it drops to 2800 to 3000 under initial load to get the sled moving then starts to pick back up. By the 140 to 150ft mark I am climbing back past 5500rpm depending on throttle control, track conditions ect. So if the 4.8 makes good power up top then I should be fine, as far as gearing goes I can do about anything needed. It will be trial and error to get it right.
So with all that being said what cam do you guys think would work good? Bigger lift better? And remember I am going to run a 76mm turbo eventually. Gathering parts for that as we speak.
thanks
So with all that being said what cam do you guys think would work good? Bigger lift better? And remember I am going to run a 76mm turbo eventually. Gathering parts for that as we speak.
thanks
02-27-2012, 08:42 PM
#19
Brain fart_ are you agreeing with me or saying give the 4.8 a shot LOL. I just feel a 4.8 will be a huge challenge to make the power, TQ esp where it needs to be. Spinning a engine to 6500 is much easier when it doesn't have 5k behind it. In racing the little cubes can do as well as the big ones, but when it is pulling, TQ is king.
For cams you can spin the dog poopie outta the motor running a 230/230 .60x style cam. But a 212/212 .0590 or even a 224/ 0.588 112 are decent cams with broad torque curves that might better suit both desired results.
