1500cc, 100hp@6500rpm!?!
 

I just bought the RS magazine (porsche dedicated) of august 2005, an on an article about the 550 spyder, they were saying that with a 1498cc engine, they were able to produce 100 hp!!!! while stock 1600cc VW engine produce 57hp. The question is: HOW DID THEY DO IT (without enlarging the engine size)!? I mean, knowing that, what kind of HP can I expect with a 1835cc with such high RPM? This is a good question and it needs reflexion...

550's used a quad-cam boxer. very little similar to a Type 1. i am no expert on the engine though to specify where the power comes from. you can get into one of those engines for about $400k-$500k though...if you can fine one. :D

Thank you Zen. Yeah..I see the trick... Although I've found such an engine for 5500 USD. Not that bad if you consider Rabi prices... But you've got to a damn good and patient macanic to play around those engines: to tune the four cams it takes up to 15 hours!!!!! Let me tell you; you don't change them every day. Another reason you get so much power is the 2 sparkplug per cylinder: better fuel efficency. I was wondering zen (or anybody) do you know if that's what the Apfelbeck project's all about: 4 head cams?

I have seen 1600cc T1 motors that make 140HP.
Its all in the heads and the compression of the motor.

Only 2 cams for the Apfelbeck Project, one for each pair of heads.
2 inlet valves and one exhaust for each head should make them able to produce 115 HP/Liter..

http://members.home.nl/r.vd.meulen/thumbs/demo.gif http://members.home.nl/r.vd.meulen/thumbs/cg10.gif

What's the project completion date now,haven't heard anything on these heads in a long while. Have you guy's given up.

No completion date yet...

We all have full jobs and a personal life as well ;)
We will get this project finished, but we won't rush it.
The original plan was to go for a "one off a kind" engine. That would have been way easyer than to try an make it into something that can be built in small series...

We will finish this project as fast as our spare time AND our budget allows :laugh:

thats impressive but the pricve seams really steep. i got my 1.7 ltr type 4 and did all my turbo stuff fur under 700 usd. and ill be pushing prolly 130 hp

The 547 4 Cam Carrera engine had high CR (11+:1) and a true hemi chamber with twin plugs and incredible RPM potential. These engines make wortless power on the street as I have driven this one http://www.aircooledtechnology.com/p...era/index.html
When I had it here for repairs a couple of years ago..

These engines run about 75K to REBUILD STOCK.. They don't make any power below 5K RPM and they are very finnicky to tune...

Here's Brent and posing with an Abarth tuned 547 from a 59 Carrera GT that raced at Leman in 1960
http://www.aircooledtechnology.com/p...rera/547-9.jpg

How about magnificent for an adjective?! What kind of type one would give a similar feel? In term of performance. 1911? 'Cauz it's basically a T1 right? T4 did not existed at the time...

356/912 engines made I think 90hp and were roughly a 1.6 liter also, but they had less bore and more stroke. The compression ratio was higher, 9:1, the heads flowed better, had dual carbs, more aggressive cam than a stock T1. Making 100hp in a T1 is doable but street worthiness and longevity will be quickly sacrificed to do so.

No replacement for displacement is the mantra.

A reasonable CR, a good combo of getting the air in and out, shoould yield you a streetable 100hp that is reliable.