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The Jack Bybee NAQ (Never-Asked Questions)
The Jack Bybee NAQ (Never-Asked Questions)
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Old 29th December 2009, 08:51 AM   #471
GTHICM is offline GTHICM  United States
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Default Boot It

Quote:
Originally Posted by Edmond Stuart View Post
Thank you so much for explanation. I would never thought of that.
One more question: a shield against what? Perhaps evil quanta?

C. E.
Spark plug shields can have a number of purposes. These purposes include, but are not limited to, the following:

1. Protection from conductive and radiant heat, as when the plug and wire is near manifolds
2. Protection from water
3. Shielding from RFI leakage that could interfere with other elctrical systems in a car

It is not true that all real cars have spark plug shielding. Porsche 911 is but one example, as well as Ferrari. I think that these are real cars.
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Old 29th December 2009, 09:37 AM   #472
Edmond Stuart is offline Edmond Stuart  Netherlands
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Default spark plug shields

Quote:
Originally Posted by john curl View Post
Cal, all REAL cars have shields like that.

REAL engines (that is, equipped with DOHCs and centrally placed spark plugs) don't need a metal shield, as the spark plugs are deeply buried inside the cylinders heads.

(BTW, this time I'm NOT joking)
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Old 29th December 2009, 11:00 AM   #473
Edmond Stuart is offline Edmond Stuart  Netherlands
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Default real cars

This car sparks without plugs.
(picture taken during my visit to Berlin)

C. E.
Attached Images
File Type: jpg E-Lotus1.JPG (318.6 KB, 237 views)
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Old 31st December 2009, 02:51 AM   #474
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Click the image to open in full size.

Last edited by tomtt; 31st December 2009 at 02:52 AM. Reason: 14632
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Old 31st December 2009, 03:00 AM   #475
john curl is online now john curl  United States
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651 HP and no dual overhead cams?
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Old 31st December 2009, 03:15 AM   #476
john curl is online now john curl  United States
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You are probably right, I note now, that many 'trick' high energy wires don't necessarily have any obvious RF shielding. I guess, the phone, GPS, SAT radio in the Bentley probably forced shielding.
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Old 31st December 2009, 10:22 AM   #477
Edmond Stuart is offline Edmond Stuart  Netherlands
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Default Dohc

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Originally Posted by john curl View Post
651 HP and no dual overhead cams?
I don't know. Just ask your friend what type of engine is fitted in his Bentley.
AFAIK, the so called "Crewe-built 6.75 litre V8 engine" has simple push rods. OTOH, the Continental GT has a W12 engine (a VW design!) which does have dual overhead cams. Also the Le Mans versions are equipped with DOHCs.

C. E.
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Old 31st December 2009, 11:25 AM   #478
jacco vermeulen is offline jacco vermeulen  Netherlands
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Hennessey does a 650hp upgrade of the 6ltr twin turbo W12, they're in TX and Orange county CA.
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Old 31st December 2009, 12:20 PM   #479
Edmond Stuart is offline Edmond Stuart  Netherlands
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Thanks Jacco. Rather hot stuff!
BTW, below some specs of that 'spark-plugless' Lotus Elise:

E. C.
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Old 2nd January 2010, 03:08 AM   #480
Variac is offline Variac  Costa Rica
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The Jack Bybee NAQ (Never-Asked Questions)
Quote:
Originally Posted by Edmond Stuart View Post
.......the Continental GT has a W12 engine (a VW design!) which does have dual overhead cams. Also the Le Mans versions are equipped with DOHCs.

C. E.
My understanding is that the VW W12 is in effect, 2 of their narrow angle V-6 engines combined. I don't know how- I assume a big new block, but the internals and cyl spacing -from the V-6

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