Quote:
Originally Posted by chernaudi
In '08 Judd claimed that they were doing close to 700bhp and that was measured at close to 7000rpm. Gibson also claim that their 4.5 liter V8 also was making 700bhp at the same time (though at significantly higher rpm).
The problem is that back then power was limited by air restrictors, while now they're dealing with fuel flow. They might be easily able to make well over 700bhp, but it won't be as consistent as it would be with air restrictors and no lift and coast.
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Well rs spyder pushed >500hp @ >10000rpm. Of course gibson V8 can push >600hp revving higher but engine won't last 3 hours (reg revlimit is 9000rpm or 9200rpm).
About judd V10, to reach 700hp @7000rpm the engine has to develope
710Nm!
Giving for genuine these figures:
Judd GV5.5 S2, V10 (72o) cyl, 4 stroke, petrol - Ethanol E10 engine.
5496cc, 94 x 79.2 mm
2006-2009: 650 bhp / 485 KW @ 7000 rpm, 657 Nm / 485 ft lbs @ 6500 rpm
2010: 700 bhp @ 8000 rpm,
550 ft lbs @ 6500 rpm
aluminium block and head
forged steel crankshaft with 6 main bearings
DOHC, 4 valves/cyl, 40 valves total
aspiration, natural with multipoint electronic Fuel Injection. 1 x 45.5mm inlet restrictor
dry sump
It's quite likely that 700hp are reached at about 8000rpm. But just think about how much fuel will be required to keep the torque curve so high at 6500rpm as these values suggest.
Repeat, these are basically the power/torque figures of a nascar engine like. Can this kind of engine be reliable enough to be used in endurance races?