Desooting the intake preheating pipe of an aircooled VW
A blocked pre-heating pipe on a VW aircooled engine may be a major reason for stalling engines shortly after start, especially under humid and or cold weather conditions.
During the restoration of the engine it is quite often forgotten to decarbonize the pre-heating pipe of the intake pipe. You will certainly have heard or read about methods to 'decoke or desoot' this preheating pipe, whatever it is called.
I find it the easiest way to knock the preheating pipe with a hammer so that you 'generate' some trembling of the steel causing soot and rust to come off from the inside of the preheating pipe.
To ensure trembling (resonance) of the steel pipe you can better hold it in one hand and hammer it with your other hand . Do not tighten the pipe in a work bench since this will prevent the steel pipe to 'tremble'.
Knocking with the hammer may take about half an hour to gain a good result, so don't give up !! Do not knock too hard to avoid damages or dents in the pipe. Mind NOT to hammer too hard on the aluminium casted part either (which holds the intake pipe and the preheating pipe together) to avoid cracking of the aluminium. The video shows how much debris came out of this one pipe.
So this way of 'desooting' is worth doing in my opinion, rather than making holes in the pipe which have to be closed by welding afterwards.
Once the hammering operation is finished you can respray the entire intake pipe assembly with zinc spray so that is becomes a genuine look.
After re-installing the intake pipe on the engine you will notice that the left hand and right hand side of the preheating pipe will have the same temperature after the engine has been running for about 4 to 5 minutes from cold (or even in less time) !
Good luck !!!!
Alfred - Belgium
Air Cooled VW Boring for 94's
Here is a real-time video of an air-cooled 1600 VW block being bored for
94mm cylinders at Costa Mesa R&D Automotive Machine Shop. (949) 631-6376
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Classic VW Engine Rebuild, By Last Chance Auto Restore.com
We began with a dual port 1600 cc engine from a 1973 Volkswagen Beetle.
The engine ran with a miss and was smoking a bit . After performing a
compression test,(both wet and dry) , we determined the crankshaft and
bearings were fine.
We replaced the pistons, pots & rings. We had the valves redone and made
several upgrades along the way.....
air cooled vw heat riser repair
this is a little how to on blocked heat riser tubes on most vw upright
engines, witch cause stalling and flat spots in accelerating,
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Air Cooled VW Thrust Repair
Here's a neat trick to save your air cooled VW engine block when the thrust
had been knocked out and a double oversize thrust bearing won't work. Watch
as John Edwards @ Costa Mesa R&D Automotive Machine Shop shows you how he
repairs this problem. (949) 631-6376
1967 VW Bus Engine Backfiring
I just reinstalled the newly cleaned intake manifold and generator - but
I've still got problems. After getting the thing to idle, and testing w/
WD-40, I suspect a vacuum leak in the right end casting. I will pull it
off and try to refit it correctly.
Check out my blog for more progress updates!
Plan B, Karmann Ghia, racing @ SCC 2012
Racing my Karmann Ghia at SCC 2012. Engine is a 2332, FK87, CB Super 04
Super Pro heads, Dellorto 48 tri-jet. Had engine struggle, so this is the
only good run on tape.