Daimler 250 V8 engine mods

[dave de roxby]

.....Except it's a Ford engine from the States I'm afraid Dave.
[/quote]

Yep, I'm aware of its basis, although I believe well modified and redeveloped for Jaguar. But how far do you take this lineage thing. I personally think every Jag since the XJ40 has looked more like a Ford than a Jag. The X300 did at least get back the faired in round headlamps of the S1,11 & 111 XJ6. But it got cheap Ford door handles, Ford seats, Ford woodwork etc - not a real Jag for me. The original XK8 had its roots in the XJS and Jaguar based Pinin Farina and F Type prototypes (later used as a basis for the Aston DB7) and so looked a bit like a real Jag at the front - never liked the back or the dashbord. But look at the latest XK, undoubtedly a fine car but the front looks more like a Fiesta or even a smiley Transit! But then again, is a present day Aston a real Aston? Actually, if we're talking Astons, I've got to say the little Vantage V8 is the only car to make my mouth water since the E type!

[dave de roxby]

a8hex said:

OK, I'm intrigued, in what way would you think an Aston is any less of a Ford than a Jag?).

I think we actually may be singing from the same Haynes manual here.

I was having precisely this conversation with my son recently. What actually constitutes a 'marque'? He said, it's a bit like defining a football team. The players may be all different from one decade to the next, they may even play at a different ground. But somehow, they are still worshipped as Whatsit United. Its the fans that count.

Maybe it's the same with cars? I don't recognise any Jag after the XJ40 as a real Jag. I might even take that borderline back to the XJ6 S111 or possibly the XJS. Others might say the Mark 11 or any model not created or overseen by Bill Lyons.

But things have to progress. The market dictates that cars have to constantly change to keep up to date with fashion, technology and legislation as well as the actual market which can be fickle. This all has to be financed and so marques are continually being passed to new owners. If the new investor is not an actual car company but, say, a bank or a Russian or Indian magnate, then the marque seems to be preserved. But when one car company takes over another, there immediately seems to be a perceived dilution of the breed. I do think that when Ford took over Jaguar (otherwise it would probably have gone bust anyway!), there was, no doubt, some good input in the way of better production engineering and business practices. Anyone who really thinks that Jaguar or Rolls-Royce car engineering of the 70's and 80's was cutting edge is deluded - miles behind the Germans and Japanese at that time. But my own feeling is that something that defined Jaguar as a marque was lost forever when Ford took over (and they promised it wouldn't).

As for the Jag V8 and Aston V8 and V12 engines, sure they use Ford dimensions as a base. But the so called Jaguar V8 is radically redeveloped from the Ford product and to say that the Aston V12 is two Ford V6's bolted together is miles from the truth. About the only thing the Aston V12 has in common with any Ford is the positioning of the bores, this to take advantage of the existing Ford production boring machines. The V12 block is totally unique, using very obviously differnet rib patterns for instance to cope with the different stresses involved. The crank, pistons and cylinder heads are all different.

Its a bit like comparing a 1956 Jaguar 2.4 engine with a 1986 4.2. Sure, they look vaguely similar, but every damned piece is different.

I am a Jaguar enthusiast through and through. I can just about tolerate that Daimler, who were a totally different outfit, became a part of Jaguar. Whatever, I've got a nice 250V8 and I happen to like like V8 engines, although not exclusively! So I'm going to do this project if it kills me!

The only point I really wanted to make about the Aston V8 Vantage is that, from an overall design point of view, forgetting the Ford connection and despite any arguments as to whether it is a true Aston or not, I find it a really appealing package and, for whatever reason, it inspires me to want one. And that's the first time I've felt like that since buying my convertible 4.2 E-Type back in the sixties!

[dave de roxby]

RW774 said:

Dave your wrong mate on so many counts. The V12 aston Does share much with the V6. I won`t labour the point but take it from me that is the case. Re the 2.4 The ends and mains are the same as 3.4 3.8. The B head is exactly the same barr smaller valves , as per the early Mk7, The bore size is the same as the 3.4 and employes the same head gasket.later 240 used the straight port head as did the 4.2, long and short stud variants
Do think about production costs.Every manufacturer interchanges parts to keep the costs down and changes part numbers / ramps up thr price.3.6 AJ6 uses the old XK big ends and so it goes on.
Now get on with that Diamler and stop fannying about

A comment had been made earlier, I think tongue in cheek to provoke discussion, that the Aston V12 was merely two V6 Duratec's bolted together which it certainly aint!

As for the XK engine, if you are being pedantic, maybe I was slightly over the top in suggesting there were no common parts between a 1956 2.4 and a 1986 4.2. There may have been a few and the engines are obviously from the same family, having resulted from steady development since the 1940's. But hell, comparing those two iterations, even the cylinder bore spacing is different.

[dave de roxby]

AJAX50 said:

The bore spacing is different on the 4.2 to make room for the bigger bores, basically the same block and the centres on the head are unchanged as the 2.4,3.4 and 3.8

Quite so

[dave de roxby]

RW774 said:

Agreed. What next??

Right! Decision made. Let's forget about other engines. We can muse about them elsewhere. I'm sticking with the original 2.5 Daimler engine - as you say, no more 'fannying' Paul!! OK?? Not that I've exactly been doing nothing over the past 12 month's - oh boy, you'll never know! My 65th looms in April, have a house to clear and get on sale by mid March. May/June should see both the time and funds to get on with the Daimler.

Meanwhile, will yank engine and box out if I can find a moment. Engine will be stripped for full inspection and rebuild. For now, main priority is to decide if I can increase the capacity to any useful extent, within economic reason. As I've said previously, having looked at the drawings, the standard engine looks to have too little meat to simply overbore by very much. Sleeving for any significant increase would involve cutting right into the waterways, effectively converting the block to having 'wet' liners with all the effects on block integity that might entail. But this is where my knowledge and experience stops and I need advice. Could this be done and could it be made to work reliably? I think stroking is probably uneconomic and of no use anyway unless the bore can be increased? Then there's the question of pistons. If I'm stuck with 2.5, sobeit but I need to know.

Let's not go off at tangents here. I need to know if I can or can't increase the cubes before I do anything else.

Meanwhile, thanks to all for the previous posts - most enlightening!

David

[dave de roxby]

Thanks v8250. All sounds good sense to me. Grateful for your offer of advice. Will pm you in due course. Meanwhile, being chased by all and sundry re a house sale which will hopefully provide the funds for this project! So may go quiet for a while!
Regards,
David

[dave de roxby]

v8250 said:

...apologies for not finishing last post...laptop decided to send post all by itself...bloody computers; grrrr!!

Thanks again v8250,
Coincidentally, my bleedin' laptop also playing up! Summut called the 'D' drive full. I didn't even know it had a gearbox! I'm in Yorkshire but get down your way frequently. Would be nice to meet up for a sensible chat.

Cheers,

David

[dave de roxby]

geeman237 said:

I am not sure if anyone on this thread is aware but a Dart owner is already deep into adding throttle bodies etc to his Dart with the V8 engine. Try this link below to the Daimler Forum.

http://www.dlcentre.com/forum/topic.asp?TOPIC_ID=7...

Thanks so much geeman237. Very interesting links and info. Oh boy, that SP250 on U-tube sounds good!

[dave de roxby]

Just wanted to say a grateful thanks to Geeman 237, v8250 and Dart for finally leading me to the experience and information I needed to get on with my project. Will be in touch soon. This thread has produced some interesting banter and I've learned a lot - thanks to all.

Priority now is to get on with selling a house which will provide the dosh for my retirement. The Daimler engine is already on the bench, waiting for a strip-down but will have to wait now until around June I guess before I can proceed. Meanwhle, I finally have some reliable info to grapple with and some calculations to do.

Cheers for now,

David