V8S short stroke crank

[MaxRothery]

Hi there

I was thinking (in a few years) or trying to build a short stroke rover V8, so I did some research and found out about the TVR V8S with the 2.0 rover V8, anyone know where I could get a crankshaft and con rods for such an engine or would they have to be custom made?

[MaxRothery]

RayTVR said:

There is a previous thread on here about the 2.0 V8 made for the Italian market, which suggests there were at least 3 still around in Italy a few years ago.

Wikipedia says'

2-litre V8S

The TVR 2-litre V8S was a 2 litre supercharged version of the V8S - this was created for the Italian market in response to their import taxation based on engine capacity. The engine was a modified 3.5 litre Rover V8 fitted with a smaller-throw crank to reduce the engine capacity, retaining the 88.9 mm bore but with a short stroke of 40.25 mm. This meant a displacement of 1,998 cc (2.0 L), with a compression rate of 8.0:1. Lucas electronic fuel injection was fitted, along with an intercooled Eaton supercharger. All of this produced 233 PS (171 kW; 230 bhp) at 6,200 rpm and 266 N·m (196 lb·ft) at 3,700 rpm. Performance was on par with the bigger V8s, with a top speed of 232 km/h (144 mph) and 0–100 km/h coming up in 6.5 seconds. Ventilated disc brakes were fitted up front, and the 2-litre V8 also got adjustable ride height hydraulic shocks.[1] There is at this time only one known to exist.

So I don't think there's much chance of anyone having tooling etc. but at least the dimensions above may give you a start - Adding the supercharger may be an even bigger challenge..

I have found the stroke length the same way, I was more looking for the connecting rod lengths. I'm guessing the rods would be similar to the standard RV8 crank just with a smaller stroke

[MaxRothery]

glenrobbo said:

MaxRothery said:

Hi there

I was thinking (in a few years) or trying to build a short stroke rover V8, so I did some research and found out about the TVR V8S with the 2.0 rover V8, anyone know where I could get a crankshaft and con rods for such an engine or would they have to be custom made?

This begs the question "Why?"

I thought the 2.0litre V8S engine had special reduced bore liners and smaller dia pistons as well. IIRC, the standard V8S bore was 94mm, with a stroke of 71mm.

If you're interested in small V8s, Daimler made their lovely 2.5 litre as fitted in their SP250 saloon and the pretty little SP250 Dart. Getting scarce and very expensive now.

There are also Youtube clips of "the World's smallest V8" which are worth viewing

Edited by glenrobbo on Thursday 5th November 13:24

Why? Well just something a bit different, Bowler bore and stroke it up to 5.0 and up to 600hp and I just think that a low displacement, high revving RV8 would just sound cool. Daimler V8 age getting scarce and I'm not sure on them

I wouldn't be reducing the bore I would probably use just a standard RV8 block and pistons, maybe a forged/billet set

[MaxRothery]

phillpot said:

MaxRothery said:

I'm guessing the rods would be similar to the standard RV8 crank just with a smaller stroke

Short stroke crank = longer rods to still bring piston to top of bore?


Would imagine parts are as rare as "rocking horse sh*t"



But yes, why??? just because you can?

I thought so, it's just a case of how much longer, and I thought they would be anyway, and yeah pretty much just because it's different to what pretty much all RV8 engine developer which is go big bore/big stroke. I'm not looking to throw it into a big heavy car like a bowler engine into a Range Rover classic so it doesn't have to make stupid power. As I've said, it's a future project so it'll most likely be an old triumph as that's my car preference

[MaxRothery]

Boosted LS1 said:

OP, whilst the stroke may be short the rods will need to be long otherwise you'll have overweight pistons. You may be able to use honda rods or something japanese and with a small journal. Guess it depends on how much you can offset grind the crank and what rod angle you'd like.

If you really get stuck but are determined to proceed with this project I could cast you a crank in sg nodular but you'd have to find a machinist to grind it etc.

That won't be necessary as it'll be a few years till I even try and get it underway, and I'll see what I can do

But thank you very much

[MaxRothery]

Alan Whitaker said:

Hi All
There is the V8 Hayabusa

http://www.holeshot-racing.co.uk/index.php/engines...

Might cost less that trying to re make the 2.ol rover V8

Alan

I knew they were expensive but I read it was 17k for the engine from radical but 23k and then there's the gearbox.

Was just going to do short throw crank and longer rods and a cam, maybe either carbs or EFI

[MaxRothery]

glenrobbo said:

MaxRothery said:

Hi there

I was thinking (in a few years) or trying to build a short stroke rover V8, so I did some research and found out about the TVR V8S with the 2.0 rover V8, anyone know where I could get a crankshaft and con rods for such an engine or would they have to be custom made?

This begs the question "Why?"

[/footnote]

That and it's easier to convince my mum that it won't be too powerful if I say it's a 2.0 rather than a 3.5-4.0

[MaxRothery]

RayTVR said:

Or you could buy an original - if you have VERY deep pockets.

http://www.ebay.co.uk/itm/TVR-200S-V8-NEW-very-rar...

Need some Mariana Trench deep pockets

[MaxRothery]

HarryW said:

RayTVR said:

Or you could buy an original - if you have VERY deep pockets.

http://www.ebay.co.uk/itm/TVR-200S-V8-NEW-very-rar...

Tbf it's a very rare car, in virtually unused original condition. Considering what's paid for 'other' collectables it's not extortionate.

Yeah, it's very rare and if I even could afford it, I would keep the engine in and run it very little

[MaxRothery]

Barkychoc said:

Knowing TVR and Peter Wheeler he probably said it was a 2 litre V8. They may have just forgotten to do the changes...

That would be funny, does anyone know if it was a cross plane crank of a flat plane crank?

[MaxRothery]

phillpot said:

MaxRothery said:

does anyone know if it was a cross plane crank of a flat plane crank?

Wikipedia doesn't specify but I can see no reason why they would have gone for a "flat plane", that would presumably have also required a matching camshaft?


More expense on what must surely have been an expensive, and judging by the number of surviving cars, unsuccessful project anyway?

Edited by phillpot on Tuesday 1st December 18:52

The rarelity is due to it only being sold on the Italian market

[MaxRothery]

phillpot said:

MaxRothery said:

The rarelity is due to it only being sold on the Italian market

I think the rarity is due to precious few being sold on the Italian market!

That to haha

[MaxRothery]

HarryW said:

Here's an old thread about one of the Italian V8S 2ltr, shame all the links are now dead.

http://www.pistonheads.com/gassing/topic.asp?h=0&a...

Yeah, is a shame that so few exist. Would be a nice engine to hear and I'm definitely considering making I've for a future project which involves a triumph, AWD and a massive body kit

[MaxRothery]

rev-erend said:

No one has mentioned it yet but Brabham asked Repco to redesign the Rover V8 (215) for them

https://en.wikipedia.org/wiki/Repco

It had a flat plane crank, different heads, 6 bolt heads etc..

That sounds like a good engine. I might try and design a flat plain crank for the 3.5/4.2 so I can use standard rods which makes it cheaper

[MaxRothery]

Barkychoc said:

I think I took copies of all the pictures of Cominoc's V8S - I'll try to dig them out.

Cheers Barky. Would love a AJP8 but there's no way I would remove it from a clean car, would have to be a 100% write off

[MaxRothery]

Barkychoc said:

Everything I have.

I do remember Cominoc saying when he bought his (brand new!!) there was at least one other at the dealer, and I think he said he knew of another one.

looks very nice, again, i would love one of these, just for the noise and rarety, but for now, ill just atempt to build one with a set of lengthend con rods ans a short stroke crank

[MaxRothery]

Barkychoc said:

phillpot said:

Appears to be a rather important bit missing!

I wondered how long it would be!

It is there - you're just not looking hard enough!

its just and so visible. still, its one hell of car

[MaxRothery]

Barkychoc said:

I still can't get my head around why you would want to make a 2 litre V8. The costs will be hideous unless you can make your own parts.
Then why would you want to?

If you want to play supercharging then do a 4.6 - here's Pete's

http://www.tvrsseries.com/sowners/greenv8s/greenv8...

Just thought it would be a cool and different engine