Jaguar v12 engine the development of a masterpiece!

[@keithgarland3404]

As an old British mechanic, I have worked on most British vehicles and engines , petrol and diesel, 1 to 12 cylinders. Personally I think the jaguar V12 engine is the best British production engine ever made, yes it has some issues in older cars, and the more modern jaguar engines make more power with better fuel economy. But for a piece of British engineering and machinery, it's a thing of beauty 👍

[@buzzwaldron6195]

The Jaguar V12 was easy, use the exact same bore x stroke of the 1950 Buick aluminum V8 and add SOHC...

[@Haffschlappe]

The Leyland Princess 2200 OHC is also a brillant engine

[@mrtatty6718]

Duplex Timing Chain, lots of modern manufacturers could learn from this😊

[@martin-vv9lf]

chevy ls overhead valve has a double roller chain. Now the single chain design is not that great, because when the chain stretches you end up with differing advances on each overhead cam.

[@FergusPol]

@@martin-vv9lf if you have a sprung tensioner on a simplex chain you should be able to time in the cams, so chain stretch and subsequent snatch and grab are effectively taken out. These engines have fairly soft cams so duplex might be unnecessary and noisy.

[@bilbobaggins4366]

You mean like ford's wet belt joke

[@camshaftcasting1451]

@@FergusPol You'd be surprised how aggressive the Jaguar V12 cam profile (C41248) is. Over 1500g peak positive acceleration, at red-line.

[@buzzwaldron6195]

GM tossed the 40K miles timing belts from the Vauxhall DOHC 4 valves per cylinder 4 cylinder and put chains on it to create the Ecotech 4...

[@ALG1K]

I built 2 7ltr v12 engines with warrior 5 valve heads at the old jaguar Radford engine plant , 700hp on the dynos One of which went into a xjs and now lives in Dubai

[@Matnrach2-mf9qr]

Imagine Paddy McGuinness discussing inlet runner length nowadays! Good old Raymond Baxter

[@antmassey6135]

Fascinating little documentary. Not seen Raymond Baxter since his days on 'Tomorrows World'. Long live the Jag V12.

[@grahamcrompton1798]

Nice little film that. My grandad always loved his V12 jaguar and despite the cost of running it he swore the pleasure he got from the engineering made it worth it .

[@user-ts1fp4nm9y]

That's one sweet sounding Jaguar!!! Well done!!! I had a 67 E Type back in the 70's when I was in my early 20's. I've always wanted another. I've never seen a Jag that i didn't lust for. They've always had some of the best designers world wide. Greetings from Virginia,USA. That was quite an informative video!!

[@andyhill6398]

I built an off road racer back in the 80"s with a Jag V12 . I used the EFI version pre HE engine still with flat head. This engine had an external oil cooler as standard, but it still only cooled the bypass oil. So as the oil pressure dropped as the engine got hot, oil flow through the cooler dropped.I remember re working the oil filter housing to send all the pressurised oil through the cooler. Loved that engine sounded fantastic. Unfortunately it was a very heavy engine. The bare block was not much lighter than a complete Rover V8.

[@Haffschlappe]

Pre HE Jags are the best...the later ones had indian Made cylinder heads that dropped valve seats

[@philhawley1219]

A complete Rover V8 was lighter than a Ford V6 block.

[@stefantrnacek1394]

I love these old auto videos.

[@davefrench3608]

Great to see Mr Raymond Baxter.

[@Felix73able]

everyone has a laugh about the fuel consumption today but this engine was miles ahead of anything at the time and hugely powerful, when injected. Geniuses. (confession I own one and it's the smoothest thing youve ever heard)

[@aureliobrighton1871]

Engine design is a wonderworld. Thankyou and all the best with your velvet giant from Bavaria. :)

[@paulelverstone8677]

The engine is a masterpiece, as was the test mule. I'd argue that the XJ13 was the best looking race car you'd ever seen. Your friends X300 V12 - that is a rare beast. Real unicorn tears rare...

[@944play]

I believe there were slightly more X305s produced than XJ81s. Close though, it's something like 4000 vs 3500.

[@phil955i]

When I was a contractor for Lucas in Birmingham in the early 90s I would see rows of those instrument clusters in climatic test chambers. I also saw a pre-production one of those XJ40 V12s in the workshop. I had a good sniff around it & noticed a big red emergency stop button on the centre console. When I asked about it they said it was just in case it went rogue full throttle on test out on the road.

[@Hobbes746]

Thanks for uploading this, it’s really cool to see such an in-depth discussion of the engine design.

[@Avtovaz21057]

i had no idea vids like this where about ! they are amazing. Really good old engineering. thanks for sharing it!

[@garymills6702]

Priceless! I grew up in the 60s watching Michael Baxter hosting Tomorrow's World. I did see him in the flesh once years ago at the Brooklands Museum and I was so in awe I couldn't approach him to say hello. I regret that now. Of course these days I'd have had a selfie with him! If anyone's interested the Journal of the SAE did an excellent technical article on this engine. Not sure now if it would be available as a reprint or perhaps online. Worth seeking out for those who want the technical nitty gritty. Of course I laughed when they said they were using Joe Lucas (Prince of Darkness) transistorised ignition and it should last the life of the engine! I did get taken for a short drive in a V12 powered XJS years ago and I distinctly remember the driver putting his foot down and the fuel consumption meter needle going off the scale at the zero end!!! Happy days.

[@martinda7446]

Raymond... 🤠

[@clivewilliams3661]

Great stuff! Thank you, I also learnt some bits about the V12 that I didn't know and can see now why Merc called this the greatest engine built.

[@whitemonkey7932]

Lovely that....I've always fancied a V12 jag....leaning towards an XJS...

[@mickvonbornemann3824]

FWIU the AJ6 engine in the XJ40 was basically one side of the V12 with a twincam multivalve head. That’s why the AJ6 is on a 22 degree slant, but internally with a counter slant of 8 degrees. Added together that matches half the bank angle of the V12’s 60 degrees being 30. In theory one could I assume create a 48 valve quadcam V12, using 2 AJ6 heads. Well unless one side is a mirror image of the other side, rather than being the same.

[@camshaftcasting1451]

You cannot put two AJ6 heads on a V12 block because of bank the offset. It would need a dedicated head for one bank. Also there is very little space for induction runners between the heads. People have done 4V Jaguar V12 with two dedicated heads but not very successfully. The slant on the AJ6 is for underhood packaging and is unrelated to V12 bank angle.

[@mickvonbornemann3824]

@@camshaftcasting1451 well of course in reality there’s always some reason that gets in the way, but you knew what I mean.

[@martinda7446]

I've seen this before, a real treat. I was a kid when the V12 was released... Only issue... This was filmed in 4:3 ratio! How anyone decided to take it from a stretched 16:9 to even worse??? Anyhow doesn't matter, the content is all.- A couple of weekends should have your Jag on the road... Get to it!

[@camshaftcasting1451]

Wally Hassan and Harry Munday both doing a great job of explaining the V12 with Ray Baxter. Four legends in one room! Brilliant - thanks for posting. The engine in your XJ40 is surprisingly similar, I think, although differences (IIRC) will include a gerotor oil pump, 78.5 stroke, ND EMS (?), May chamber, lip seal crank and a die cast block.

[@buzzwaldron6195]

C'mon, the Jaguar V12 was easy, use the exact same bore x stroke of the 1950 Buick aluminum V8 and add SOHC...

[@camshaftcasting1451]

@@buzzwaldron6195 Except (1) they are not the same bore and stroke. (2) "Just add SOHC" tells me you did not spend much time designing new engines ... None-the-less (1) Buick 215 is a fine engine. (2) Jaguar designed, built and partly tooled a 1970s V8 version of the V12 which was so poor that it was never produced.

[@buzzwaldron6195]

@@camshaftcasting1451 - Both 3.5" x 2.8"... using MMs may confuse you... Buick 215" 3.5L V8 x 1 1/2 = 5.3L Jaguar V12... I started with GM Engineering in August 1966... how about YOU? I have 2 Buick 215s around yet... one in my '75 MG Midget... other for fitting twin turbos to... Back in early 1960's my daily driver was the turbocharged Olds 215 version in '62 Jetfire: kzbin.info/www/bejne/gKvaZopnp7eApck

[@camshaftcasting1451]

@@buzzwaldron6195 OK. Get a calculator out and see if 3.5 x 2.8 inches is 90 x 70 mm. It ain't. It's within a mm or so, but that is a mile in engineering. I do hope they didn't let you near the engine design department at GM. Beyond simple mathematics, your assertion that the Jaguar V12 is just an easy SOHC-conversion-and-add -four-cylinders to a 215 Buick is ludicrous, if you just look at the two engines side by side, you'll see so many major differences.

[@buzzwaldron6195]

@@camshaftcasting1451 - Brits and Americans use feet and inches and MPH... we speak the same language... mm is added just for the Europeans...

[@rumpoh8039]

STADLER AND WALDORF AT WORK AT JAGUAR

[@cheharrison7107]

Thanks KZbin for suggesting this! I owned one about 12 years ago, thought I'd buy something insane before i had to many responsibilities 😅 man it was fun, if i gave it some welly the onboard computer said 8mpg's. Unfortunately the previous owner had not looked after it and it ended up catching fire! I long to have one again, best looking car in the world, best of luck, hope the dreaded tin worm aint to bad 🤘

[@johnnytenjobs]

Wally Hassan. He worked for Coventry Climax so there is a sort of Imp connection in a way. His input goes all the way back to single seater Brooklands Bentley racing cars. I said hello to him once at Montlhery in France.

[@truthseeker5911]

Jaguar bought Coventry Climax.

[@paulhawkins6415]

If you look closely at the beginning of the video, there is a hillman husky by the gate. It was powered by a Coventry climax engine

[@ThreenaddiesRexMegistus]

Now chaps, steady-on, it’s aluminium! 🇬🇧

[@FergusPol]

Jaguar bought a written off Ferrari Daytona and used the engine to develop this V12. Later Bob Blake who was Styling Department foreman, and a wizard panel beater, bought the remains, rebuilt the car in his garage at home and used it to come to work, much to the surprise of William Lyons."Why is that man driver a Ferrari?" The rebuilt Daytona features on Chris Rea's album cover 'Road to Hell'.

[@Omegaman1969]

Wow, Thanks for posting that.

[@buzzwaldron6195]

LOL! The Jaguar V12 was easy, use the exact same bore x stroke of the 1950 Buick aluminum V8 and add SOHC...

[@Haffschlappe]

I never understood why jag did not the Austin 2200 engine inline ohc six for making a siamesed v12

[@Omegaman1969]

@@Haffschlappe It probably would have been too heavy (iron block )and only output 220 hP

[@jimclarke1108]

Excellent Jag, V12

[@buzzwaldron6195]

Notice the Jaguar V12 was easy, use the exact same bore x stroke of the 1950 Buick aluminum V8 and add SOHC...

[@jimclarke1108]

@@buzzwaldron6195 Rover?

[@buzzwaldron6195]

@@jimclarke1108 - Yes, Rover bought the Buick design... and lengthened it to a V12...

[@jimclarke1108]

@@buzzwaldron6195 Next was the P76 4.4 L😁

[@williamedwards7837]

Proper Brummy engineers.

[@Haffschlappe]

You cant use HE V12 they drop valve seats! Oder pre HE are better.

[@mattblack156]

Very interesting, but if the engine was so good, why did they get a terrible rep for being unreliable and prone to ignition system failure and overheating? I remember 5 star 100 octane petrol when I was a kid, essential for Jags and other performance cars at the time. After watching that, I recon Raymond Baxter was easily the smartest man in the room, you should look him up, and amazingly talented man who I remember presenting Tomorrow's world when I was a kid!

[@Omegaman1969]

That would be the fault of Lucas, not Jaguar :-)

[@garymills6702]

It was a marketing film so he was always going to be complimentary. That's if he wanted paying of course!

[@truthseeker5911]

Overheating is a failure of the cooling system and not the engine and is usually due to a lack of care and maintenance. The engine employed one of the earliest forms of electronic ignition and so was not as reliable as modern systems and the later cars were better.

[@buzzwaldron6195]

See that the Jaguar V12 was easy, use the exact same bore x stroke of the 1950 Buick aluminum V8 and add SOHC... and a $25 super reliable GM HEI module inside a $500 box labeled "Jaguar"... but screw up the car with bad wiring practices in the factory...

[@Haffschlappe]

Any Ferrari is unreliable too

[@CraigOverend]

90mm x 70mm. How far can you move the linings for the Imp to gain a larger bore and still align that with the crank by using the motorcycle self-aligning rods? :)

[@buzzwaldron6195]

Realize the Jaguar V12 was easy, use the exact same bore x stroke of the 1950 Buick aluminum V8 and add SOHC...

[@craigarmstrong5291]

The last aluminium body proper jags are the one's you want last forever 😅😅

[@erichlausch9886]

👍👍👍👍👍

[@chuckschillingvideos]

"Masterpiece" ??????? Guffaw. It's a boat anchor.

[@LaurenceTalbot-i4y]

For any American watching its pronunciation is jaguar not jagwar 😂😂

[@peterwilkinson2998]

MINT!

[@MrPeterbennett]

Great engine but very thirsty

[@philhawley1219]

All big engines are thirsty. The Jag V12 is quite frugal compared to some American V8s.

[@samstewart4807]

no, the jag v12 is the most thoroughly poorly designed modern v12 in automotive history

[@Haffschlappe]

If you install a Mercedes 6.9 V8 its a nice reliable and fast car

[@truthseeker5911]

It was designed over half a century ago and has been out of production for nearly thirty years so hardly now modern. Tom Walkinshaw said it was a good engine and he won many races with it including Le Mans. Group 44s Jaguar V12 in America used to beat anything powered by an American engine.

[@tonychavez2083]

That’s why it won LeMans a few times in the late 80’s right? It was very durable and extremely balanced..

[@mitreswell]

Flat cylinder head with go.bustion chamber in ghe bore, Chev 409 notwithstanding, always struck me as purely a bean counter decision, not an engineering one.

[@buzzwaldron6195]

Yeppers, the Jaguar V12 was easy, use the exact same bore x stroke of the 1950 Buick aluminum V8 and add SOHC... then don't screw it up... with bad wiring practices... etc... Buick was running 11:1 in that little V8 in 1963...

[@Haffschlappe]

The heads so were easier to Manufacture in India

[@truthseeker5911]

They were used for performance as they provide a better gas flow and a lot of performance engines used flat heads. Even Fords crossflow kent engine had a flat head.

[@buzzwaldron6195]

@@truthseeker5911 - Flat bottom heads got replaced by combustion chambers...

[@truthseeker5911]

@@buzzwaldron6195 Technology progresses. Most engines now use four valve heads as well. Tom Walkinshaw always stayed with the flat heads for racing rather that the HE heads.

[@twister9304]

Razzzzzz

[@FranciscoLinera]

Masterpiece and Jaguar do not fit together. What an abominable pile.