Discussion
4.0 cross bolted block, 4.6 crank rods, 4.0 pistons ( more comp about 10.25 )
+ 1.5 mm on valves, throats opened to suit, real steel cam, shortened trumpets, lightened flywheel, Mark Adams chip, Fuel pressure regulated on the dyno for the best compromise, plus a couple of small bits and bobs, but thats the main bit. Bought the 4.0 engine for £700 ( 2001 Disco ) then got a porous 4.6 for not alot for the crank, sold the old 4.0 se motor for around £650, all my own labour and ebaying the left overs, cost me around £700. Not bad eh???
+ 1.5 mm on valves, throats opened to suit, real steel cam, shortened trumpets, lightened flywheel, Mark Adams chip, Fuel pressure regulated on the dyno for the best compromise, plus a couple of small bits and bobs, but thats the main bit. Bought the 4.0 engine for £700 ( 2001 Disco ) then got a porous 4.6 for not alot for the crank, sold the old 4.0 se motor for around £650, all my own labour and ebaying the left overs, cost me around £700. Not bad eh???
brummiewedge said:
Torque was just under 290lbs, at the wheels around 240BHP.
Now I would have thought that the torque should be higher than that - has the MA chip been re-mapped post the engine build? And are the injectors coping? Presumably you needed to crank the fuel pressure up quite a bit?
7.
>> Edited by number 7 on Wednesday 29th March 11:47
HarryW said:
Ah No7 what did yours come out with in the end , gotta love 4.3's
.
Hi Harry. Well, after all the hanging around, finally got 297 bhp (corrected from 255 at the wheels) and 320 of torque. I think that "only" 14% transmission loss is quite conservative though. The power was still climbing when it hit my self-imposed limiter of 6100 rpm (real, not tacho), but I thought a bit of mechanical sympathy was in order
number 7 said:
Ah No7 what did yours come out with in the end
Hi Harry. Well, after all the hanging around, finally got 297 bhp (corrected from 255 at the wheels) and 320 of torque. I think that "only" 14% transmission loss is quite conservative though. The power was still climbing when it hit my self-imposed limiter of 6100 rpm (real, not tacho), but I thought a bit of mechanical sympathy was in order
Thats pretty impressive as you say 255 @ the wheels is very good and could read 300-310 on other roads, loads to torque
. Did you have an issue with the RR printout only going up to 5K5 , I kow they are about to change RR's over to a new one. btw My little 4ltr showed 237 and 247lb @ the wheels corrected to 275 & 285 . Whilst the torque peaks at 4K5 the power graph chops at 275hp @ 5K5rpm still climbing 
, whereas I know it actually peaks around 6K1rpm. Shame its got to make room for a cerb now tho 
.It did make 313bhp in 4th gear, but the dyno is set up to be more accurate in 3rd..whatever, i'm no dyno expert, but theoretically i could have claimed it!! Chip was out of another car, i'm not spending loads of money setting up a sh:te old injection system, i'd put the money into emerald.
brummiewedge said:
It did make 313bhp in 4th gear, but the dyno is set up to be more accurate in 3rd..whatever, i'm no dyno expert, but theoretically i could have claimed it!! Chip was out of another car, i'm not spending loads of money setting up a sh:te old injection system, i'd put the money into emerald.
Interesting, I understood this 3rd/4th gear thingy was an excess speed issue for the Rolling road, for a RV8/LT77/T5 car it makes little or no difference, if anything the torque multiplier of being in 3rd should give higher readings for Torque over a 4th (1:1 ratio) gear run from my limited understanding
. I think we'll leave it there though, as this forum, like the S forums, is not one for going around in circles banging anyones particular drum
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