Engine size by numbers
Discussion
quote:
Hi guys,
Anybody know if you can determine engine size in CC from the engine number on a Rover V8?
Either from the layout of the numbers or by ringing rover/tvr?
Nope. There is a Dutch guy that has collated the Rover engine numbers where you can work this out but as Rover never produced 4.3, 5 litres etc it doesn't help. but TVR use a random number generator and their own numbering scheme. They could tell you from the number but you could get that info off the reg doc. If you are that paranoid you could remove the heads and measure everything...
Steve
www.tvrbooks.co.uk
quote:
Hi guys,
Anybody know if you can determine engine size in CC from the engine number on a Rover V8?
Either from the layout of the numbers or by ringing rover/tvr?
I would be very surprised if you could, because the main castings are all common across all engine sizes, it's only the whirly bits (technical term) inside that differ.
quote:
Cheers Steve,
I suppose I could get it rolling roaded, if a 4.0 is around the 200bhp mark a 4.6 must be around 240bhp.
Not an exact science I know but...
I've seen 4 litres doen to 180 and up to 220. A 4.6 could be not much better or a lot better depending on the which twirly bits are inside... If the rolling road shows 220 what is it?
Check the provenance. What receipts are there? Who fitted the engine? Do they know recognise the car? What engine number is it? Does this match. Do the homework and if it doesn't fully satisfy, walk away...
Steve
>> Edited by shpub on Friday 30th August 16:09
There must be an easy way to measure engine capacity. Like filling the engine to the brim with water (or orange juice), then turning it round carefully once and catching the stuff in a bucket as it pours out of the exhaust ports. Then transfer the liquid to a measuring jug and presto - there's the volume!
I could make quite a niche for myself here.... though probably in room with bouncy walls...
I could make quite a niche for myself here.... though probably in room with bouncy walls...
You could take out a spark plug and get engine to tdc, then stick a long thin soft stick (!) in the plug-hole and turn engine till piston reached the bottom then measure the big soft stick and compare it to the crank throw. As the bore's the same on all models, its just the stroke thats different isn't it ?
shpub said:
schueymcfee said: Just a quick update (if anyones bothered!)
Apperently the size is stamped near the number 1 lobe by the crank IIRC. e.g 4.6.
Now does that mean it is a 4.6 or a 4.6 that has ben cranked to 5 or cranked and bored to a 5.2 or 5.3?
EH?????
I don't care what it means as long as it's not a 4.0!!
As the bore's the same on all models, its just the stroke thats different isn't it ?
Errr... strictly speaking the bore isn't the same on ALL models, just MOST of them.
It could be a 3.5L, that used the same stroke. It could be a 3.9 by TVR, the bore is half a millimetre less than the 94mm standard; it could be a 3.9 by LandRover (aka TVR 4-litre!) which IS a 94mm.
If it was one of RPIs 5.8 litre units, it would be 94mm with a long-throw crank. God knows what they're doing to get 6 litres out of it, but there are a couple of mods by others that use 96mm pistons... and all this is before you look at the valves, the cam and the porting!
I'd also look to see if it's a cross-bolted block: I thought about converting my 390 to a 580 (for about 20 minutes;-) but it has the earlier casting so can't be crossbolted (properly) and I didn't fancy meeting my crankshaft at 100 mph. On a racetrack, of course...
NOW are you confused?!
Ian
EH?
I know mines cross bolted, just didn't know if it was 4.0 or 4.6 - I specified 4.6 but you never know!
I don't want to get 2 years down the line and spend $$$$$ on various upgrades to find its still a 4.0!
This bottom end isn't TVR it's direct from Rover so I thought giving Rover a ring would put my mind at rest!
I know mines cross bolted, just didn't know if it was 4.0 or 4.6 - I specified 4.6 but you never know!
I don't want to get 2 years down the line and spend $$$$$ on various upgrades to find its still a 4.0!
This bottom end isn't TVR it's direct from Rover so I thought giving Rover a ring would put my mind at rest!
2 sheds said: If you were going to put it on the rollers anyway, the torque would show if was a 4.0 or 4.6, if its got a mild cam 260+ ft lb from a 4.6 and under 230 from a 4.0L.
Tim
Tim:
Under 230 from a 4L?? Surely not!? Are you telling me that TVR were selling pork pies when they claimed the 390SE had 275 lb. ft.? You do surprise me.
It's like those domestic midi 'hi-fi's that claim 100 Watts output. Hmmm.......
Ian
'It's like those domestic midi 'hi-fi's that claim 100 Watts output. Hmmm....... '
Yes indeed. Cheapo 'hi-fi's' use PMPO (peak music power output) which is the max power of each speaker added together for the highest possible number. Marketeers call it added value but it fools the sort of people who buy the box with the most flashing LEDs on.
Sensible systems use RMS (root mean squared) which is kind of an average. Example: My Denon system boasts a modest 40W RMS per channel but I can't get the volume control past 40% before the windows start shaking.
In conclusion, the answer to the 'TVR power - how much?' question is clearly that TVR express their bhp as PMPO, not RMS! So divide the quoted number by the number of cylinders and divide by 1.414 and that's the true bhp!
Yes indeed. Cheapo 'hi-fi's' use PMPO (peak music power output) which is the max power of each speaker added together for the highest possible number. Marketeers call it added value but it fools the sort of people who buy the box with the most flashing LEDs on.
Sensible systems use RMS (root mean squared) which is kind of an average. Example: My Denon system boasts a modest 40W RMS per channel but I can't get the volume control past 40% before the windows start shaking.
In conclusion, the answer to the 'TVR power - how much?' question is clearly that TVR express their bhp as PMPO, not RMS! So divide the quoted number by the number of cylinders and divide by 1.414 and that's the true bhp!
Have a look at my site (not TVR but plenty of Rover V8 stuff) www.ajmac.co.uk
If it's a Land-Rover engine then as stated, the foundry CAST '4.0' or '4.6' on the first counter weight from the front on the crank.
Alastair
For my site, does anyone have some photos of their engines I could add? Especially some internals shots of the 5 litre, I've never seen one of those on the bench.
FYI, the 6 litre advertised by rimmers has a 4" bore like the old 350 chevy and a silly stroke, new block - the whole works. However I do know a man who can build you a 5.6 (or was it 5.4?) from a standard 4.0 x-bolted block. Anyone fancy beating some 500 griffs :-)
If it's a Land-Rover engine then as stated, the foundry CAST '4.0' or '4.6' on the first counter weight from the front on the crank.
Alastair
For my site, does anyone have some photos of their engines I could add? Especially some internals shots of the 5 litre, I've never seen one of those on the bench.
FYI, the 6 litre advertised by rimmers has a 4" bore like the old 350 chevy and a silly stroke, new block - the whole works. However I do know a man who can build you a 5.6 (or was it 5.4?) from a standard 4.0 x-bolted block. Anyone fancy beating some 500 griffs :-)
FYI, the 6 litre advertised by rimmers has a 4" bore like the old 350 chevy and a silly stroke, new block - the whole works. However I do know a man who can build you a 5.6 (or was it 5.4?) from a standard 4.0 x-bolted block. Anyone fancy beating some 500 griffs :-)
And how much does one of those little beauties set you back!??
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