Porsch engine vs VW engine
Mel P.
So what makes the Porsche engine so much faster, stronger, etc.?
--
Mel P.
77 Bug w/ stock FI
70 KG Cabrio
Anthony
2 more cylinders, for a start. If you're talking about the oldest
Porsche engines, like what the 356 used, the VERY first versions WERE
VW engines and produced the same horsepower. However, the 4 cylinder
engines in the 356 super 90, Carerra and other faster cars made from
70-110 (I think) HP because they used different induction (dual carbs,
usually) different exhaust, higher compression ratios, bigger valves
and different rocker arms and valve geometry.
If you're talking about the aircooled flat 6 the Porsche 911 uses, like
I said, it has two more cylinders for a start. It has a balanced
crank, chain driven cams in the head, better cooling for oil and air,
some had dry sump lubrication, better exhaust, big valves, everything
is precision made and balanced. There are tons more differences but
I'm too lazy to look them all up and list them.
Porsche aircooled engine =/= VW aircooled engine unless it's the four
cylinder type 1 in the 356 or the four cylinder type IV in the 914, and
type IV VWs. Plus the type IV =/= type 1. Type IV is much stronger.
veed...@isp.com
Mel P. wrote:
> The older air-cooled Porsche engine are the same design as VW. (I think)
> So what makes the Porsche engine so much faster, stronger, etc.?
Dear Mel,
Calling the Porsche and VW 'the same design' is stretching the point to
the max. They both happen to be horizontally-opposed air-cooled
four-bangers but that's about as much as you can say with regard to
their 'same-ness' without the need for qualifiers.
You really need to take one apart to appreciate their differences. But
beware... once you appreciate WHY they are different... why the exhaust
valves have 10mm stems and their own rocker shaft and all the other
'unimportant' details -- you'll understand why VW heads are inherently
limited to a maximum SUSTAINABLE output of 45bhp regardless of
displacement.
-Bob Hoover
Dave Tosi
produced 90 HP and had a redline of 5800 rpm; the SC had 105 HP and a
redline of 5500. The 912 used basically the SC engine and it had 107 HP at
5800. All these engines were built more sturdily than the VW engines, which
is why they cost more. They were designed for maximum usage for long times.
The Super 90 actually had an oil pickup that swiveled, so that when
centrifugal force threw the oil to one side of the engine, the oil pickup
was there. It also had ballcheck valves in the valve covers to prevent
leakage during hard cornering. Another tidbit, was that the Super 90
exhaust valves were sodium filled for better cooling. It is more than
carburetors and exhaust systems.
The beetle engine was built for regular consumer use, whereas the Porsche
engine was built to race standards. The are similar, but not the same,
other than opposed 4 cylinders.
The 6 cylinders are another story altogether.
Fweem.
Dave
-
David A. Tosi
Facilities Manager
Habitat Re-Store
3826 High Point Road
Greensboro, NC 27407
Also an antique VW nut!
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