High HP low torque high revving engine options
10-26-2011, 01:24 PM
#1
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High HP low torque high revving engine options Hi guys
Im thinking of doing a engine transplant in the future
But the cars drivetrain wont be able to handle much more than 400ft lb's of torque (at the fly) with out spending crazy money
But im wanting 500-550HP at the fly,
And would like it to rev high 7500rpm if possible
What combination would be best for this? if at all possible
Thanks
Alex
Im thinking of doing a engine transplant in the future
But the cars drivetrain wont be able to handle much more than 400ft lb's of torque (at the fly) with out spending crazy money
But im wanting 500-550HP at the fly,
And would like it to rev high 7500rpm if possible
What combination would be best for this? if at all possible
Thanks
Alex
10-26-2011, 01:50 PM
#5
Village Troll 
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If you are going to drag race then you are going to have to rev to the moon before launching which means you may exert the equivalent amount of devastating torque through the driveline than if you had average torque.
It's not necessarily any given amount of torque that kills parts. It's shock to the driveline.
It's not necessarily any given amount of torque that kills parts. It's shock to the driveline.
10-26-2011, 01:57 PM
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If you are going to drag race then you are going to have to rev to the moon before launching which means you may exert the equivalent amount of devastating torque through the driveline than if you had average torque.
It's not necessarily any given amount of torque that kills parts. It's shock to the driveline.
It's not necessarily any given amount of torque that kills parts. It's shock to the driveline.
Where would I find a rotating kit for such a short stroke?
10-26-2011, 02:11 PM
#7
Put an L99 (4.3L V8 from 94-96 Caprice) crank in an LT1 block. It's been done before, but I don't know the details.
All I know is it can be done Cheap, knowing the guy that did it!
Stock parts, but you'd want a blueprint rebuild for the way you want to use it.
All I know is it can be done Cheap, knowing the guy that did it!
Stock parts, but you'd want a blueprint rebuild for the way you want to use it.
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10-26-2011, 03:19 PM
#8
dont mean to rain on your parade here but what you are proposing is very unlogical...........make the car right to handle the power then handle the power plant........i can 100% guarantee issues with the road you are trying to take........do it the right way...........it will be cheaper to run a properly designed mid level engine and spend the rest of your money on the driveline than spend all you money on high dollar parts to rev the car high for no reason at all.......
also stoke/bore does dictate torque/hp but its less than 50% the factor......top end design and camshaft selection will dictate the way the motor makes power.........
also stoke/bore does dictate torque/hp but its less than 50% the factor......top end design and camshaft selection will dictate the way the motor makes power.........
10-26-2011, 03:23 PM
#9
The guy Pat is referring to used my old L99 crank and the L99 rods with LT1 pistons, the L99 rods are something like 5.94 so the L99 had the same height piston as an LT1 and used a longer rod to get the piston near the deck. I probably wouldn't trust stock L99 rods at those rpms though, might work, but finding out it didn't would be expensive.
10-27-2011, 06:24 PM
#16
I beg to differ with you but, it's shock loading that kills drive lines. Lets say you are turning 7,000 RPM and you smack second gear, what do you think is going on downstream from the transmission as the RPM comes down?
Don't start another torque/horsepower war, PLEASE. It's all horsepower! (Gasp, did I really say that!) Three big fat guys sitting on a couch exert more pounds of torque than your engine and no horsepower
Al 95 Z28
Don't start another torque/horsepower war, PLEASE. It's all horsepower! (Gasp, did I really say that!) Three big fat guys sitting on a couch exert more pounds of torque than your engine and no horsepower
Al 95 Z28
10-27-2011, 09:04 PM
#17
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used crank and rods from a cup motor and custom pistons. will also need the correct bearings/spacers to use the small journal crank in the large journal block. and misc. other things.....
10-27-2011, 10:57 PM
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Blah blah blah, torque, horsepower, etc etc etc. You NEED them both to move. You can compensate one for the other in your builds but why would you focus on that aspect? Just build it reliably to do what you want. You want to hit the track, start in the suspension and driveline. You wanna go fast down the strip, make torque/power blah blah whatever you want to call it. Simple as that. Buy some suspension, buy some bolt ons, buy some gears, and forget revving to 9k in an lt1 without BOOKOO cash.
