Thanks for the 3,0 Sl Chris. It's a little out of the Mercedes-Benz Konzernkultur, but maybe we can make it work :-)....
Mig, it's been a while, but it was a well known crankshaft grinder in Orange County, CA. These guys are all very familiar with doing this kind of work and I probably drove them a little nuts with all my engineering question related to durability, which they had already answered for themselves through many years of experience, but couldn't quite express in theoretical terms. There was even a second alternative, also nearby, but the wait was longer, so I used these guys.... Let me know if you get serious about sending out your crank shaft and I can help you locate them.
Please understand that having the crankshaft throw increased is only a small part of the project, the geometry, so to speak. Most of my engineering work went into figuring out how the dimensioning of cylinder head and my forged pistons went together, in order to get a usable and efficient engine, in other words how compression ratio, breathing, fuel, valves, valve timing and ignition timing would all go together to translate that geometry into good power....
TR, the reason I haven't done a dynometer test, is that I didn't think it would tell me that much to get some rear wheel horsepower figure, let's say between 170 to 180hp and then not know how to compare it, since I hadn't done any benchmark test on the previous engine (also, rear wheel horsepower ratings are said to be about 15% lower than the DIN ratings, but who can really say for sure how that would compare on a car equipped with a 40 year old drive train design, with an automatic transmission, radial tires....) My sense is, that the two numbers would just be like apples to oranges and not worth the effort. I DID take some benchmark horsepower measurements with an on board G-tech accelerometer and I just need to take the corresponding measurements, now that the car and engine are all dialed in. Hopefully that won't be too far off, but I always find I'm more busy working on Pagodas (currently even a 1970 Opel GT) than these fun extra-curricular activities ;-)
Regards, Tom Colitt
ClassicAutosLA