What was done to the TVR 4.3 engines.
Discussion
As far as I know:
The precat (Griff) 4.0 and 4.3 engines are based on a LR 3.9 block.
The serpentine engines (Chim 4.0, Griff and Chim 5.0 [& 4.5?]) are based on a 4.0 block.
I don't know about pre-serp catalysed (early Chim 4.0) engines - 3.9 is my guess.
The 5.0 is stroked and bored. The 4.3 is a shorter stroke than the 5.0. It's hardly worth having new crankshafts made for a 100cc increase, so the 4.0 precats must be bored 3.9s. The 4.3 is probably a stroked as well as bored 3.9? More than that I don't know - someone else will though.
The precat (Griff) 4.0 and 4.3 engines are based on a LR 3.9 block.
The serpentine engines (Chim 4.0, Griff and Chim 5.0 [& 4.5?]) are based on a 4.0 block.
I don't know about pre-serp catalysed (early Chim 4.0) engines - 3.9 is my guess.
The 5.0 is stroked and bored. The 4.3 is a shorter stroke than the 5.0. It's hardly worth having new crankshafts made for a 100cc increase, so the 4.0 precats must be bored 3.9s. The 4.3 is probably a stroked as well as bored 3.9? More than that I don't know - someone else will though.
pwd95 said:
My understanding is that the 3.9 & the 4.0 Ladrover/Range Rover is just a paper exercise, i.e they both have 3948cc. There's a huge variety of configurations over the years they just kept making improvements especially to the block, crossbolting etc.
It's much more than that. Remember that TVR led the field in RV8 development from the mid eighties and the larger cc engines were driven by TVR; the LR versions came along later. There are dozens of basic configurations and hundreds of different detailed specs for TVR engines alone. Ten to twenty years later others have done further developments.Why would you want to know?
I think the 4.3 TVR engine was based on the 3.9 engine
with a larger bore .. the press at the time said cosworth pistons although I doubt many had those, std crank, bigger valves and some inlet work, large free flow air filter with a very free flow exhaust .. hence the loverly noise.
Quoted power was 280 bhp and about the same torque if I remember.
with a larger bore .. the press at the time said cosworth pistons although I doubt many had those, std crank, bigger valves and some inlet work, large free flow air filter with a very free flow exhaust .. hence the loverly noise.
Quoted power was 280 bhp and about the same torque if I remember.
rev-erend said:
I think the 4.3 TVR engine was based on the 3.9 engine
with a larger bore .. the press at the time said cosworth pistons although I doubt many had those, std crank, bigger valves and some inlet work, large free flow air filter with a very free flow exhaust .. hence the loverly noise.
Quoted power was 280 bhp and about the same torque if I remember.
Interesting that..... as someone recently mentioned to me that all the 4.3's he had looked at seem to have the same size valves as the so called "BV's" ..... with a larger bore .. the press at the time said cosworth pistons although I doubt many had those, std crank, bigger valves and some inlet work, large free flow air filter with a very free flow exhaust .. hence the loverly noise.
Quoted power was 280 bhp and about the same torque if I remember.
oh and just remebered 4.3's were ported as well (what vere that means.... so complete numpty on engine specs/terminolgoy)
Hoover. said:
rev-erend said:
I think the 4.3 TVR engine was based on the 3.9 engine
with a larger bore .. the press at the time said cosworth pistons although I doubt many had those, std crank, bigger valves and some inlet work, large free flow air filter with a very free flow exhaust .. hence the loverly noise.
Quoted power was 280 bhp and about the same torque if I remember.
Interesting that..... as someone recently mentioned to me that all the 4.3's he had looked at seem to have the same size valves as the so called "BV's" ..... with a larger bore .. the press at the time said cosworth pistons although I doubt many had those, std crank, bigger valves and some inlet work, large free flow air filter with a very free flow exhaust .. hence the loverly noise.
Quoted power was 280 bhp and about the same torque if I remember.
oh and just remebered 4.3's were ported as well (what vere that means.... so complete numpty on engine specs/terminolgoy)
Fairly sure that the bore is the std 94.0 used on all 4.0ltrs and the crank is longer stroke of 86mm.
The 4.3's are all non-serpentine tho'
I know mine's been ported on the exhausts ( as I've had the manifolds off) so its more than likely to have have something done on the inlets as well.
Its the std throttle and trumpets tho'
I'll let you know when I pull it apart next year
Matt
The 4.3's are all non-serpentine tho'
I know mine's been ported on the exhausts ( as I've had the manifolds off) so its more than likely to have have something done on the inlets as well.
Its the std throttle and trumpets tho'
I'll let you know when I pull it apart next year
Matt
4.3 = 94.0 x 77.0 mm (4280 cc) according to the Bible and any other source I have on hand.
The only engines that I heard of having Cossie pistons are the 4.5 BV
Although I've seen non-BV 430's that actually had the big valves, they normally have std Vitesse valves (40/35 mm) with waisted stems - mine did, at least.
Heads are massively ported (in fact, arguably too much so - lower air velocities leading to fuel 'drop out' at lower rpm/throttle openings), intake manifold port matched.
Std cam is '214', although '224' and '234' have been known to turn up inside these, too (in the last case, you'd know about it by the idling quality, though
).
IIRC some would have O-ringed heads and metal head gaskets.
All in all a bit more elaborate an RV developement than the later 4.5s and most of the time rather closer to TVRs power and torque claims (280bhp/310lb.ft).
The only engines that I heard of having Cossie pistons are the 4.5 BV
Although I've seen non-BV 430's that actually had the big valves, they normally have std Vitesse valves (40/35 mm) with waisted stems - mine did, at least.
Heads are massively ported (in fact, arguably too much so - lower air velocities leading to fuel 'drop out' at lower rpm/throttle openings), intake manifold port matched.
Std cam is '214', although '224' and '234' have been known to turn up inside these, too (in the last case, you'd know about it by the idling quality, though
). IIRC some would have O-ringed heads and metal head gaskets.
All in all a bit more elaborate an RV developement than the later 4.5s and most of the time rather closer to TVRs power and torque claims (280bhp/310lb.ft).
JR said:
It's much more than that. Remember that TVR led the field in RV8 development from the mid eighties and the larger cc engines were driven by TVR; the LR versions came along later. There are dozens of basic configurations and hundreds of different detailed specs for TVR engines alone. Ten to twenty years later others have done further developments.
TRUE...At that time, if you look at the evolution of the LR you will see TVR were there just before LR every time.....at that time there was TVR Power (NCK, Grahame Nash Motorsport, John Eales,(then JE engeering of old) Chesman Engineering, Fardon engineering, and many more adding to the TVR used and abused list.Adrian@
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