MrNvgtr

For the layman here, can someone please explain what we're talking about? Pictures help too.

kos11-12

Hi Robert ,
Very interesting, I hope you can achieve the performance, is that with pump fuel,
I always though the 2 valve engine could produce
over 100 bhp a litre,
My guess was to chose the proper valves size and port plus a proper gas flowing work on the heads to start with ...

Steve Weiner-Rennsport Systems

Well designed & properly built 2-valve motors can produce over 115 HP/litre,.... .

biggynuts01

how much would it cost to build that? You can pm me

FormulaRX

Redesigning a brand new engine for our beloved Porsches and using aircooled technology when the rest of the car world has long abandoned it. Using new materials, new design, the OP took it upon himself to revolutionize the aircooled motor...an example of what Porsche might be doing if they were to produce a new aircooled engine design for 2016

kos11-12

That was my guess, and probably at the wheels with high performance cams and Pistons with race fuel ,
What do you recon ?

drbooba1

So if we interpolate 115 per liter to a 4 litr 2 valve motor we should have 460 HP and right now we have a 4 valve Porsche 4.0 rs producing 500 and actually a 4.0 cup GTD 2012 motor produces 475 with out restrictors the new engines aren't what they are cracked up to be.

regards

Robert Linton

My apologieds for not replying sooner, but I had a few difficult days. First, still waiting for the new camshafts but hope they will be delivered in a very few days.

As to some more information. All dyno work was done on street gas and with a catalytic converter (and, yes, HP would have bee greater on race gas and without a Cat). The engine is 4.0. The crankshaft is a Porsche part although final engines could have more elegant and lighter cranshafts (tungsten counterweights, etc.). The Bosch Motronic used is a modern one. The case is that of a "Mezger" engine. As you would expect, quite a bit of work has been done within the engine. Should anyone wish to discuss, please call me at 212-628-6778.

Robert Linton

Additionally why go through this effort?

First, because we wanted a "base" engine as we work on the 4-valve version.

Second, I thought that there might be some who might like such an engine.

Third, what I am doing includes, at least for me, some fun which I get very little of (as some of your know, among things, due to health issues, I cannot drive) and, most important, to generate additional funds for the trust that I am establishing to help improve education in rural America and for military families.

eddieb4

Would be interested too ... Please pm me with cost estimate.
Thanks

Robert Linton

Update: the specially camshafts came in wrong for the fourth time from one of the world's leading camshaft suppliers. Given this, they sent a messenger yesterday, Saturday, to pick them up and we expect them back by Tuesday. Assuming the fourth time is the charm, I expect the engine to be run with them by week's end. Nevertheless, work on the 4-valve engine continues.

Robert Linton

New camshafts in. 443.5 HP. Disappointing to everyone. Engineers working on several ideas including yet another set of camshafts. Do not want to increase RPM above 7400 on this engine. Am sure, we will reach at least 445 HP nevertheless. 4-valve version should go above 8500.

evoderby

Sorry to hear about the new cams not bringing the expected results as well as your health preventing you from driving.

evoderby

I guess your cam design is the result of extensive simulation, could valve bounce (in their seats) due to aggressive closing ramps be the reason the engine/cam is not performing as expected?

Robert Linton

Thanks you. In fact, I have not driven since 1997. As to the camshafts, as this is far from my area of expertise I will ask.