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long time back ,1970/75, while speaking with Smokey Yunick(Daytona FL.)
he came up with a piston crown design,never went to production, called "Yin Yang piston top". swirl shape is for producing a positive swirl in flat chamber engines 2 valve, they are the valve notch reliefs, slight taper upwards on center!
just maybe some could advance the concept. he called the inlet valve MALE, the exhaust was FEMALE, LOL.
Similarly . . . the V12 Twin Turbo engines I described had idle set at 3000RPM so turbo lag was almost non existent and torque came on fast and broadly out to beyond 6000RPM . . . none of which is translatable to your in-car project, but interesting.
Cheers,
Ken
Interesting, The guy who owned Jagworks had one of Gary Walkers TT XJS's built into a race car, this had a twin turbo 6.7L making just north of 600hp it idled normally and was a beast, I saw Bruce light up a set of hot 12" slicks exiting the pits at Eastern Creek.
Forgot to add that the only parts here that is from Jaguar are the bolts just visible in the cams for holding the sprocket; I use them for turning the cam when I take measurements for top hat shims.
Love those pics and all that boootiful machining. Shelby? Now there's a bloke who knew a thing or five about engines.
Cams? Pic shows a big lift, but unlike those I dimly recall that initially posed such top end problems for those early V12 race engines, this has far less shoulder on the lobe . . . "big ears" was the vernacular of the day . . . and this resulted in incredibly fast valve accelerations at the high RPM being achieved.
Love those pics and all that boootiful machining. Shelby? Now there's a bloke who knew a thing or five about engines.
Ken
You bet,,,,,,,, my brother has a 1967 Shelby GT500 one of the handful with the 427, engine was re-built by Shelby 2 years before he died, 619rwhp on the dyno. NSW engineer made him de-tune it by 200hp before he would approve engineering.
Interesting, The guy who owned Jagworks had one of Gary Walkers TT XJS's built into a race car, this had a twin turbo 6.7L making just north of 600hp it idled normally and was a beast, I saw Bruce light up a set of hot 12" slicks exiting the pits at Eastern Creek.
My last three cars 2008, 2009, 2011 were all Turbo cars
2.5L 5 cyl turbo (225bhp)
2.5L 5cyl turbo (305bhp)
3.8L V6 twin turbo (530bhp)
all were tractable from low revs with negligible off boost lag.
Modern turbos can idle as well as any petrol engine (below 1000rpm)
be docile and easy to drive around town and yet produce serious horsepower and torque and performance to match.
With continual improvement to turbo technology (roller centre bearings), improvement in impeller and compressor profiles lead to higher efficiency and faster spool up times.
couple these changes with much more sophisticated ecu technology and modern Turbo petrol engines have loads of advantages with few downsides that are not able to be rectified.
I would love to see a modern twin turbo V12 Jaguar engine with properly designed intercooler and ecu
no doubt in todays technologies, turbo is the way to go!
i have setup many turbo engines, also some engine drive supercharged engines, back to 1962 rootes type!
that said i think its easier to go turbo, and if you are not into serious racing, or all out max HP.
remote is cheaper and it does make plenty of usable torque /HP.
i still think i could go XJS stock V12,remote mount , and a variable rate water /alky aux. injection, petrol car, even an HE , with aftermarket engine management system!
i have two turbo cars at this time!, had three sold one, ran it on used/filtered veg.cooking oil, got 50mpg US gallon, free oil from local Chinese restaurant!
I would love to see a modern twin turbo V12 Jaguar engine with properly designed intercooler and ecu
Unlikely methinks . . . given the scope for the more recent, far more compact and lighter, quad valve V8 platform. Running one of these strong V8 units at 5L out to 6L, in twin turbo race format, should easily nett in excess of 1,000BHP and with torque figures that will have most transmissions and rear ends weeping in no time.
agree Paul59, true actually i dont think any jaguar engine will ever make 1000HP, realiably.
i was refering to a stock 6.0L HE , and making 500HP twin remote turbod!
if you cant make the V12 heads breath NA, just forced feed it with turbos!
unless some one has BIG money to put into one!
it could be done with a BILLET Ali. block and serious BILLET cylinder heads.
agree Paul59, true actually i dont think any jaguar engine will ever make 1000HP, realiably.
i was refering to a stock 6.0L HE , and making 500HP twin remote turbod!
if you cant make the V12 heads breath NA, just forced feed it with turbos!
unless some one has BIG money to put into one!
it could be done with a BILLET Ali. block and serious BILLET cylinder heads.
anyone got 1/2 million bucks to waste?
Originally Posted by ronbros
we have some R35 around Austin Tx, making between 750/1000HP, actually 3or 4 that hang out at local speed shops!
OH Yes, did you catch the latest VQ GTR made close to 3000HP, all time record!
done in DUBAI , probably took over a million $ to do it , its all secret, car did the 1st 5 second 1/4 mile run , for everyone to see!
the world of performance is getting totally nuts, unlimited money, and hiring the ultimate tech people!
Hi Ron,
stock 6.0 HE plus twin turbo, 500bhp would be great, less than 100bhp per litre should be low stress.
Regarding 3000bhp GTR, I hadn't heard of that one, the fastest I was aware of when I owned GTR was US version AMS Alpha Omega upgrade with approximately 2000bhp, 1600whp that ran 7.48 sec quarter with 192mph terminal and with top speed run over one mile of 233mph
First was Ford Focus ST with Volvo engine, second Focus RS, also with Volvo engine (albeit with Ford mods)
Third was Nissan R35 (aka GTR)
Ah, the Duratec ST The engine Ford decided to take from Volvo and keep it (that is why Volvo ditched all 5 cylinders, as Ford took the patents and design rights from Volvo).
Actually, the group B rallye was cancelled due to several deaths of viewers along the tracks/courses.
The Audi 5's weren't the first turbo 5s on the market nor the first 5 cylinders. Lancia and Mercedes were a lot earlier. Mercedes with a 2.4l diesel, Lancia with a 2.0l or 1.8l (don't nail me with the size) petrol engine.
The 2.1l 5 cylinders can handle power, but Volvo's 5 cylinder was better, and that isn't just some crud. 850 T5 won the BTCC as the first estate/wagon ever. It can produe power figures, well, enough to cause wheel spin in 5th gear. All with a huge power band.
Currently, as my XJ8 has been written off by a VW Crafter, I am back to driving a Volvo 5 cylinder. 2.0l, 180 hp LPT automatic. Effortless driving. The 3.2l V8 in my XJ is a more relaxed driving, but the 5 cylinder in the Volvo is a reliable unit which can make power very easily. I keep on trying to pursuade my parents to give the car a remap... An easy 300 hp can be achieved just with a remap. K18 turbo and a few more tweaks would allow this old motor make a good 400 hp. All out of 2 liters (1986 or so ccm).
If you want a mega reliable engine which will last forever and will put out 700 hp and more: Volvo B234FT. 16V 2.3l turbocharged 4 cylinder redblock. That'll make power and withstand more than 3 bar boost... Best sleeper you can get. A boxy old Volvo...
long time back ,1970/75, while speaking with Smokey Yunick(Daytona FL.)
The engine Ford decided to take from Volvo and keep it (that is why Volvo ditched all 5 cylinders, as Ford took the patents and design rights from Volvo). 
