Let's be honest about OPOC's engine - it is hopelessly bad.
The claims are wildly exaggerated or just plain ridiculous.
The real point of interest with this engine is how somebody as apparently impeccably qualified as Hofbauer could come up with something as bad as this. If it wasn't for...
Repco had some very interesting examples.
http://img89.imageshack.us/img89/4508/102271repcobrabham.jpg
http://forums.autosport.com/index.php?showtopic=65534&st=80&p=3668049&#entry3668049
Porting the head and increasing cam lift may be OK but the amount of duration increase must only be slight.
Anything like even a slightly "sporty" cam will drop the cylinder pressure to the point where the engine will be impossible to start or run at low RPM.
Presumably a continuously variable...
Sam - I did wonder if that was a notch for locking - but in picture IMG 3561 it looks very battered.
63000km (about 40,000 miles) - this is almost a new car by my standards - even less likely to have wheel bearing (or any other) problems.
What make of car is it?
I don't disagree with any of the calculated values or the logic behind them.
However - the original problem was a practical one. Jsgarage asked if he needed to use the original length 2.7" (68mm) threaded length. If the original engine used a thread length of 68mm - I personally would...
TR - My intention was that it would be interesting to compare calculated and actual thread lengths used by manufacturers.
And yes, - I am a great believer in "(a bit) more is better". Proper engineering calculation and design and then being slightly generous in material thickness, bolt diam...
Rather than try to calculate and speculate on the thread length of studs - what is the stud diameter/thread length on some well-known alloy-block engines like the Chev LS series V-8's and the Rover V-8's etc. Probably a good indication of what is needed.
I think there are a couple of things that nobody seems to have commented on.
Firstly - the car originally had wheel bearing trouble - unusual for a reasonably new car. Accident damage?
Secondly - is that a big fractured chip out of the end of the drive shaft? The shaft would presumably be...
As ever, I tend to agree with TB. It is notable that if you add "a bit to be on the safe side" to his 1.94 inches it is not a lot different to the original 2.7 inches. I would be inclined to stick with the original length - quite possibly the makers of the block knew what they were doing.
On a...
I have to put in a few words in support of Smiffy - there is far too many outraged "You're wasting our incredibly valuable time" type of comments on this forum in general. His original question was perfectly reasonable.
In the first photo supplied by Sam the end of the CV joint looks very rusty and pitted for a 2006 model - and there is rust on the face of the fracture as if it was all ready cracked somewhat. Maybe the car had been in an accident that Sam didn't know about or second hand damaged parts from a...
