TVR/Rover 4.8 or 5.0 short engine
Discussion
For an offroad rally car I am looking for a 4.8L or 5.0L rover V8 engine. As far as I know this is a non-standard upgraded version of the standard 4.6L engine. I already have the upgraded heads which are now mounted on a 3.9L engine. Does anyone know where such a short engine is for sale for a reasonable price? Preferably in Europe.
Another option would be to have the conversion done myself. What is the exact modification done to turn the 4.6 into a 4.8 or 5.0? Is this only increasing the stroke or do they also replace the cylinder liners with a bigger bore?
Best regards,
Erik
Another option would be to have the conversion done myself. What is the exact modification done to turn the 4.6 into a 4.8 or 5.0? Is this only increasing the stroke or do they also replace the cylinder liners with a bigger bore?
Best regards,
Erik
Could you please help me to understand what you mean with 4-bolt bottom end? I can find that there is a difference between the normal and cross-bolted engines but what is specifically the difference I cannot find. Of coarse the most important is the compatibility with the cylinder heads and gearbox.
Using a turbo or blower is not an option, both rule-wise and because of the amount of sand and water in the offroad rally. The 3.9 engine we have now is already equipped with John Eales heads and a TVR exhaust. This together with the changes to the injection (reprogrammed 14CUX) we now have 200BHP on the wheels (with the 4x4 drive system), so probably around 250BHP at the crank. This proves to be insufficient, therefore we would like to increase the output power and specifically the low-ed torque (now 340Nm at 4k rpm and 300 at 2.5k)
Using a turbo or blower is not an option, both rule-wise and because of the amount of sand and water in the offroad rally. The 3.9 engine we have now is already equipped with John Eales heads and a TVR exhaust. This together with the changes to the injection (reprogrammed 14CUX) we now have 200BHP on the wheels (with the 4x4 drive system), so probably around 250BHP at the crank. This proves to be insufficient, therefore we would like to increase the output power and specifically the low-ed torque (now 340Nm at 4k rpm and 300 at 2.5k)
I've found some places where they sell the converted short blocks for a 4.8 and 5.0. What I don't get is why the 5.0 is so much more expensive than the 4.8. Both have a bore of 96.0mm where for the 5.0 the stroke is longer. Why does this have to be so much more expensive?
In case of the 4.8, are the crankshaft and conrod standard or are they also custom made? I assume the piston is non-standard in both the 4.8 and 5.0, am I correct?
In case of the 4.8, are the crankshaft and conrod standard or are they also custom made? I assume the piston is non-standard in both the 4.8 and 5.0, am I correct?
Well, we got a bit further with the engine. It is now being assembled to be put in the car. After the first 300km of break-in we will go for the rolling road again. Hope to see 300bhp at the rear wheels.
The engine specs for the interested readers:
JE developments 5.15L crossbolted V8
Bore 94.5mm
Stroke 91.5mm
Conrods 5.700" centres
Pistons are forged Omega
Compression ratio: 10.0:1
Stage 3 heads (JE developments) fully ported
Inlet valve: 42.8mm
Exhaust valve: 36.2mm
Tvr plenum and trumpets
Tvr exhaust manifold with straight open pipe to the back (no silencers)
The engine specs for the interested readers:
JE developments 5.15L crossbolted V8
Bore 94.5mm
Stroke 91.5mm
Conrods 5.700" centres
Pistons are forged Omega
Compression ratio: 10.0:1
Stage 3 heads (JE developments) fully ported
Inlet valve: 42.8mm
Exhaust valve: 36.2mm
Tvr plenum and trumpets
Tvr exhaust manifold with straight open pipe to the back (no silencers)
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