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It would seem it’s extremely difficult to remove the LH cylinder head on an Aussie car with the engine still in the chassis. The EGR pipe is a big headache.

Cold pressure washers are almost as good & available at Bunnings for reasonable cost. I’ve been toying with buying a hot pressure washer for years but it’s very hard to find a decent one for less than $2k. Hard to justify unless you’re going to use it LOTS! Then if the diesel burner breaks down...

A mates gold 6.9. I might start a thread unless he beats me to it lol! We’re looking at all options, but if rings cannot be found then it’ll be a rebore to BB Chev or LS size (due to parts availability), plus lightweight high compression pistons.

Yes liquid hydrogen is even worse & extremely volatile! Not exactly ideal for personal use. I was hoping it might ensure our internal combustion engine would live on post petrol but it’s not looking very viable unfortunately. However with a 4 year wait for my favourite machinist to rebuild an...

Well it seems I’m in the process of a 6.9 rebuild now... What started as a blown headgasket has turned into a full rebuild. And a big factor on how things progress is the availability of piston rings. So why aren’t you driving yours much? Any current pix or video??

Nice work & looking much nicer now! I’ve found a hot pressure washer with degreaser & detergent to be the best method for cleaning larger areas, or hard to reach places. Not a lot of effort required, quick and with excellent results. Followed by my policy of never driving it in the rain or on...

Yes ignition is far easier with today’s tech!

It appears it was a Hilborn fuel injection system. https://en.wikipedia.org/wiki/Stuart_Hilborn

Without clearer photos, it appears they used an early form of mechanical fuel injection & ignition was likely to be similar to other cars of the era. So it’s unlikely those systems contributed to the lower output. I’m still trying to find more info but as predicted it’s extremely hard since it...

Another observation is why exactly the highly modded 6.3 couldn’t achieve good hp figures. It can be seen there’s no limiting KJET manifold (the 6.3s standard manifold was better than the later design), big throttles & the exhaust manifolds have been discarded in favour of headers. Could it be a...

Another option would’ve been to have inlet & exhaust rockers facing opposite directions to separate the valves vertically but that would’ve required a lot more oil galleries for the lash compensators. Food for thought but not something that could easily be achieved. And unfortunately designing...

Yes confirmed. The 6.9 struggles to breathe through the 450 throttle plate & 450 sized exhaust collectors. The plenum also reduces flow by about half on the smaller 560. So it begs the question why Benz designed a unique engine that was later marketed as the fastest 4 door, yet hobble it with...

Yet to be confirmed but it seems the 6.9 throttle is the SAME SIZE as a regular 450!!!

For sale 4 x original BBS Mahle wheels to suit W116, W126, W123, W107. Period correct for a very special vehicle. Restored, almost perfect & ready for use! $1700 ONO

Looks like it’s not quite the silver bullet I’d hoped. In order to keep NOx down, mixtures must be set as such that it roughly halves the power compared to a petrol equivalent. Hardly an appealing option! Then there’s the bulky high pressure vessel and small atoms which have a nasty habit of...

Looks like this is what Geoff tried a while ago on a std manifold. Hopefully I can make it work on a custom setup. I just discovered the 6.9 exhaust collector is the same size as ONE of four Holley 4BBL throats fitted to an Ford XYGT 5.8!! The XY had fairly small exhaust systems fitted to the...

By comparison, the Holley 750DP square bore which I believe was fitted to the XYGT used 4 x 1 11/16” (approx 43mm) barrels. So the 6.9 uses an exhaust which has 1/2 the flow capability of a 5.8!!

Just ordered one of these which is the size they should’ve been in the beginning. It will be tested on both the 560 & 6.9 (with EFI) since in won’t fit under the Kjet & is too big for the stock manifolds even after machining.

Here’s a very cool 500SEC I found recently on FB. Apparently the owner has a very large collection. Pity there’s no engine mods to match the exterior....

Wow I haven’t had any good experiences with them but maybe it’s time to have another look?