F1technical.net

Thanks Gruntguru for the info regarding the function of the vanes on the inlet valve, they are indeed to promote swirl to better mix the air/fuel mixture .

The vanes are fixed in place on the valve stem.

1965 Honda 50cc,125cc,250cc 22000 rpm

http://m.motorcycle-usa.com/289/15555/M ... RC148.aspx

wuzak wrote:

J.A.W. wrote:4T valve then.. & are the valve stem vanes also designed to spin, or are they fixed?

Ford 427 Nascar mill was needed to.. win Le Mans/whip Enzo's machines/fill out the GT 40 engine compartment..

7l engines to beat the 3.3l-4.0l Ferraris?

Yes, the production-derived pushrod V8 Ford mills had proved too highly strung in 4.7 litre form to last for 24hrs
at the pace of the pursang V12 Ferrari units, but the big boy could, & did.. ..for the win - in `66..

From what i can remember they were gear driven ,quad overhead cams. Ford would runthem on a dyno ,wide open for 48 hours and if the engine stayed togetherthey would stick it in a gt40 for le mans .the brakes were double caliper airplane landing brakes. Im sure you know what the 40 stood for.

Ford did have OHC engines, & ran an Indy race 4.2 litre V8, but it wasn't too reliable..
NASCAR also banned the Ford 427 OHC as not 'stock', so AFAIR, all the 'GT 40' Le Mans winners used pushrod V8s.

J.A.W. wrote:Ford did have OHC engines, & ran an Indy race 4.2 litre V8, but it wasn't too reliable..
NASCAR also banned the Ford 427 OHC as not 'stock', so AFAIR, all the 'GT 40' Le Mans winners used pushrod V8s.

I found only 1 reference to this and it said they didn't have those engines ready in time to race so they used the pushrod block. Iread about this 427 beast in a magazine from the seventies. If i'm wrong please excuse me.
I'm not sure if you can 600 bhp out of a pushrod 427

No excuse!

Nah, but seriously though S-N..
.. if we can all get to improve our knowledge base here, its all to the better..

Those booming big-block NASCAR mills had to be banned (of course).. ..too much easy torque..
..too much for the trans in `65.. ..they were de-rated from high rpm spec - to give that solid torque..

http://www.enginelabs.com/engine-tech/e ... storation/

But by `69 Ford had won more'n a few Trans-Am races with their production based 5 litre small-blocks,
& had got them fairly well sorted, certainly proved good enough to defeat the Porsche factory team..
..in the - by then veteran - GT 40 at Le Mans..

& of course Porsche had to come back with a bigger 12 cyl mill - to finally get the win - with the 917..

Scuderia Nuvolari wrote:1965 Honda 50cc,125cc,250cc 22000 rpm

http://m.motorcycle-usa.com/289/15555/M ... RC148.aspx

excellent read.

& Honda was up against ( & beaten by) this kind of machine ( 50cc 2-stroke triple turning 20,000rpm)..

http://www.advrider.com/forums/showthread.php?t=412922

https://www.youtube.com/watch?v=L-0AH79mY2E

https://www.youtube.com/watch?v=mYINrhTNiyM

50 cc (turbo, I think?)

147 mph

You've got to love the fact that someone does this!

J.A.W. wrote:No excuse!

Nah, but seriously though S-N..
.. if we can all get to improve our knowledge base here, its all to the better..

Those booming big-block NASCAR mills had to be banned (of course).. ..too much easy torque..
..too much for the trans in `65.. ..they were de-rated from high rpm spec - to give that solid torque..

http://www.enginelabs.com/engine-tech/e ... storation/

But by `69 Ford had won more'n a few Trans-Am races with their production based 5 litre small-blocks,
& had got them fairly well sorted, certainly proved good enough to defeat the Porsche factory team..
..in the - by then veteran - GT 40 at Le Mans..

& of course Porsche had to come back with a bigger 12 cyl mill - to finally get the win - with the 917..

As i remember it, they barred these big blocks out of endurance racing soon after the gt40's had started taking le mans by storm every year.
I remember seeing a diagram of a 427 in which i saw 4 overhead cams and amass of gears to drive them.
Maybe this was in ford's R&D dept. And never saw a race track because the rules changed. It seems strange to me that i can't find anything about this.
Does anyone here have any knowledge about this?

Here's an article on the Ford SOHC 427..

http://www.macsmotorcitygarage.com/2014 ... 7-sohc-v8/


As to whether that 7 foot long cam chain would've hacked 24hrs at Le Mans,
- maybe Ford had been running a gear-drive set up on test?

Brian Coat wrote:https://www.youtube.com/watch?v=mYINrhTNiyM
50 cc (turbo, I think?)
147 mph
You've got to love the fact that someone does this!

Seemed heavy - slow acceleration for a 150mph machine.

At the end of the run, note how he seems keen to park close to the toilet.

G-G, you do realize that it was 50cc, not 500cc or 5000cc?

I saw it as remarkably torquey - for its capacity - to overcome that gearing..
& hacking that pace - was no mean feat - IMO..

I still think its heavy.
0-60, 40+ secs
60-80, 17 sec
80-100, 20 sec