Well, we "know" Darren is incompetent, Les' engine is the proof of that
and that little escapade doesn't say much for Daryl's *competence* either.
Back on the 9th, Darren made these comments;
On 9/9/21 12:17 pm, Noddy wrote:
> You were very lucky. Blue and Black Holden engines were
> notoriously unreliable and well known for their relatively
> short life spans. When I was an automotive machinist in a former
> life for Repco the workshop was right next door to Alan Mance
> motors who were a Holden dealer. We used to do all their warranty
> machine work, and there was a *hell* of a lot of it. Especially
> on Blue Holden V8 engines that would be worn to the point of
> having poor compression by as little as 60k km's.
The lies start very early on with his extremely fraudulent claim to
being an auto machinist. A Holden *blue* V8 worn out by as little as 60k
klms? I call bullshit on that claim since the red block and blue block
V8s were the same casting, the difference being in the heads and other
bolt-on ancilliaries like the manifold, 4 barrel Quadrajet, ignition
system. These ancilliaries were *more efficient* and the blue block was
the recommended start point for performance mods. Poor compression by
60k klms? Bullshit! The *block* is the same.
Darren followed up that laughable bit of bullshit with this;
On 9/9/21 12:17 pm, Noddy wrote:
> The pinking (or pinging as it's more commonly known in Australia
> was probably due to the fact that they gave the engine a massive
> overbore which raised the compression ratio considerably. I've not
> heard of Higginbottom, but if they were anything like Gem or
> Goldstar it used to be common practice back in the day to bore all
> their engines straight to a 1/8th inch oversize. Their logic behind
> that ridiculous practice was that it sped up the process as engines
> didn't need to be inspected after they were dismantled and where all
> just cut to the one massive oversize. The disadvantage was for the
> customer, as being a thin-wall block Holden engines didn't like
> having half their cylinder wall thickness cut out and they suffered
> horribly from bore distortion, ring flutter and overheat issues.
>
> Your fuel economy and random stalling problems were tuning issues.
A massive overbore? I call bullshit on that. All the engine
reconditioners out there at the time used standard overbore sizes. These
were;
first overbore size = +020",
second overbore size = +040",
third overbore size = +060"
The reason they use those steps is that 020" is half a millimetre so it
is *convenient*.
The allowance for bore taper back in those days was 009"-010". It's
obvious to all but the unknowing that a 010" rebore wasn't on the cards
except on an engine that was *well under* that level of taper. So, No,
010" was never a rebore option for reconditioners. But then, neither was
080" because that would have meant a very thin cylinder wall. What's
more, if the cylinder casting was even the slightest bit misaligned from
core shift during casting, the likelihood of breaking through the
cylinder wall was very high. Even with a 060" overbore, it was
definitely recommended that a sonic wall thickness test be carried out
before boring. Some Chev 350 blocks with moderate core shift couldn't be
bored more than +030" before cylinder wall thickness was compromised.
The way H&M Engines operated was they would wait until they had a heap
of common engines - like the I6 Holdens, for instance. Then they would
strip all engines and measure the blocks. Anything that would clean up
at +020" would go into one pile, anything that wouldn't clean up at that
would be put into the +040" pile. For some engines there *might* be a
+060" pile, for blocks known to have issues there wouldn't be a +060"
pile. They didn't have a +080" pile, they would only be done as special
order, onus on owner, and not as part of the normal exchange engine
rebuilding process. Gem, Goldstar and all the other major engine
reconditioners operated in much the same way.
Common practice to bore *all* the engines straight to 1/8" oversize? I
call bullshit on that since 1/8th of an inch is 0.125". Not many engines
will handle that, especially on later engine blocks where weight saving
became an issue with castings leaving a lot less leeway for the boring
bar to do its stuff. They'd get bore distortion all right, especially
when the boring bar cutter broke through the cylinder wall. Hell, I6
Holden engines would be lucky to get to +080" and will have possible
overheating issues at +060" overbore
If ever anyone needed proof that Darren was never a machinist, you have
it right there in the post cited above. He has no idea of the system
employed in engine reconditioning companies, especially the large ones
like Repco, yet he *claims* he was an apprentice auto machinist at
Repco. I used to share a staffroom with 6 auto machinists including one
who was foreman at the Footscray workshop where *and when* Darren claims
he was an apprentice with Repco. It's a small world and, for Darren, a
tad too small. ;-) Such a pity Repco sent all their auto machining
apprentices to Richmond TAFE. I really must have that *catch-up* with
Darren's former boss when next I manage to get myself down to Melbourne.
Certainly I've missed the past couple of staff past and present annual
gatherings.
--
Xeno
Nothing astonishes Noddy so much as common sense and plain dealing.
(with apologies to Ralph Waldo Emerson)