Bug Bollocks

I’m currently waiting for Australia Post again, this time to deliver some glass tubing to replace the broken drippers on the Bebe so in the mean time I am having another crack at the Bug’s low speed chug.  In the tradition of fixing one thing and breaking another, this has only been evident since the new diff was installed as I’m now cruising at lower revs.

Up until now I had mistakenly believed the following from the publication “Grand Prix Technicalities” put out by the Bugatti Owners Club UK:

Bug Bollocks

That does seem logical until you think about the alternative firing order of 1,3,4,2, so if Carb A was connected to cylinders 1 & 2 and Carb B was connected to cylinders 3 & 4

Cyl 1 3 4 2 1 3 4 2
Carb A B B A A B B A

You get “two successive sucks followed by an interval” (or a Swedish pop band) as stated  in 4.17.  So it’s bollocks, strangely Ettore went to some trouble fitting two inlet valves a cylinder then siamesed them, making it just about impossible to predict the outcome.  They just run better with one carburettor, so I have ordered a new manifold for hopefully the right reason..

Colin Chapman had the answer for siamesed ports on the Austin 7 engine see here for the story.

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I must have far too much time on my hands, I have included a few pics from this week of the Bebe, note the echos of Bugatti in the tappet cover and the unbent banana tappets. Also checked the valve timing which was spot on and read this great article on Model T valve timing which makes a lot of sense in slow revving low compression engines.  Lastly people talk about ABS, ESC and even ESP making their car safe, the Bebe on the other hand has automatic ignition cutout if the oil drippers are turned off, now that’s a safety feature.

Cheers

Mark

 

The Tale of Two Rallies

Over the last two weekends I have been on two distinctly different rallies with the common theme running through them, my inability to diagnose simple faults.

First off the Veteran Car Club’s 1 & 2 Cylinder Rally.  As the Sizaire is still waiting for a new front axle I pressed the 1914 Douglas into service, well that was the idea.  The first day was spent going everywhere other than that listed in the directions to the point that I covered 50Km for a 30Km run and never arrived at the destination.  Day two I had a cunning plan to follow a reliable car only to be foiled by the Dougy failing to proceed from the car park as it was backfiring and had an ominous intermittent knock emanating from the bowels of the engine.

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So day two was spent pointlessly pulling apart the engine when as it turned out the problem was self inflicted.  During the preparation for the rally I decided to fit a cutout switch as the throttle is configured such that if a cable broke it would go full flat out and as the decompressor does not work (long story) it could be painful.  Uncharacteristically I did a very neat job, unfortunately by running the wires parallel to the high tension all sorts of spikes were entering the low tension side causing the engine to backfire to such an extent that the flywheel loosened (the knocking sound).  Never the less the rally was good for all the usual reasons of good company, food and drink.

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The next rally was the 50th Anniversary Bugatti Club Australia Rally held at Creswick.  I only attended the last two days so had to get up at an unheard of 6:00 on Saturday to get away at 7:00 for a 9:30 start, on the freeway the Bug just goes with easy cruising at 100Kph, however under load the exhaust was popping and a general wooliness  at lower speeds so as I am very adept at going off on tangents I blamed the twin Solex carburetors, these still may be partially at fault but the main culprit was too much advance. When I got home I retarded the ignition 5 degrees went out and wrung its neck, no more popping which in retrospect was probably indicating pinging (or pinking) so as my friend Andrew McDougall says “most carburetor problems are in fact ignition problems” (again)

Cheers

Mark

Bug run

I have just returned from a Bugatti rally in NSW, had a great time and most importantly the T37 did not miss a beat.

We set off two weeks ago with 4 days to get to the start of the rally in Sydney, there were four cars and six people, all the cars were over eighty all the people were under seventy so a leisurely drive was envisioned.

We tried to leave at 2:00 after a nice lunch at Des Dillon’s but Roger’s T44 refused to start, after 30 minutes Des discovered a stuck solenoid so off we went but at the Smith street roundabout the motor died so it was decided to swap out the battery.  This is where we discovered that the car had been built around the battery, so the front seat had to come out, still no luck.  In the end a claw hammer was used to good effect bludgeoning a partition in the battery box to make way for the battery extraction, 2 weeks later Roger is still removing the battery every night to charge it.  The alternator is from a VW, so still kaput.

On the second day all was going well when the Bentley suddenly lost drive 30Km south of Pambula, the (add on) overdrive unit had failed, a local stopped and lent us a chain so the 12 Litre Hispano Suiza found its true vocation as a tow truck.  To cut a long story short, in Eden the overdrive and tailshaft were removed then the tail shaft lengthened and the whole thing was back on the road now without overdrive by lunchtime the next day so we still made Ulladulla before nightfall.

On the third day… as with the next 1 ½ weeks all went well, except for Luc’s  T43 that sheared the flywheel key but Matt the mechanic with the aid of super strength Loctite had it back on the road  so no time lost.

Oh yes, after leaving Bombala this morning after about 40 km I could smell that lovely scent of burning wood.  I assumed the Dept. of Smoke and Embers were burning off so ignored it until it was joined by the smell of burning rubber and the ignition light coming on, I stopped.  A piece of wood that was holding the battery had come unscrewed and wedged itself under the alternator and as the whole outside of this alternator revolves we had some nice friction going on, to see if it really was hot I put my finger on the alternator….. I am hoping to get feeling back after the blister eases. Some screws were robbed from elsewhere and I was back on the road with the car none the worse for wear.

If we had driven modern cars they probably would not have broken down, but if they had, I doubt we would have had it fixed by lunchtime and what would there be to talk about…Golf?

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