[AT] Hot Bulb Engine (tractor)

[DDSS]

Until the call from my son, I never had heard of a hot bulb engine.   There 
is a Field Marshall tractor I have seen that sort of looks like the Lance 
Bulldog.   I was at an event once and there was a Field Marshall there and I 
had never seen an engine started with a shot gun shell before.  Learn 
something new every day :)

Thanks

-----Original Message----- 
From: Dean VP
Sent: Sunday, May 04, 2014 3:11 PM
To: 'Antique tractor email discussion group'
Subject: Re: [AT] Hot Bulb Engine (tractor)

Dick,

Check this out:

1910-1950s[edit]

Direct injected small Diesel engines still were not practical[10] and the 
prechambered indirect
injected engine was invented, along with the requirement of glowplugs to be 
used for
starting.[12][13] With technology developed by Robert Bosch GmbH pump and 
injector systems could be
built to run at a much higher pressure. Combined with high precision 
injectors, high speed Diesels
were produced from 1927.

The hot bulbs started to develop cracks and breakups and were gradually 
replaced by water cooled
cylinder heads with a flat hot spot.[14] Over time the compression ratios 
were increased from 3:1 to
14:1. Fuel injection started from 135 degrees before top dead center with 
low compression down to 20
degrees before top dead center with later higher compression engines 
increasing the hot air factor
[10][15] for ignition and increasing the fuel efficiency.[10] Glowplugs 
finally replaced the
preheating with a blowtorch methods and engine speeds were increased, 
resulting in what is now
classified as an indirect injection Diesel.[10]

Hot bulb or prechambered engines were always easier to produce,[10] more 
reliable and could handle
smaller amounts of fuel in smaller engines than the direct injected "pure" 
Diesels could.[10]

Dean VP
Snohomish, WA 98290

" . . . The tree of liberty must be refreshed from time to time with the 
blood of patriots and
tyrants. It is it's natural manure . . . " Jefferson


-----Original Message-----
From: at-bounces at lists.antique-tractor.com 
[mailto:at-bounces at lists.antique-tractor.com] On Behalf Of
DDSS
Sent: Sunday, May 04, 2014 10:34 AM
To: atis
Subject: [AT] Hot Bulb Engine (tractor)

My son in Chicago called me. A neighbor has an old tractor that he no longer 
wants and asked my son
if he would like to have it.  The neighbor says it's a 1939 Bosch hot bulb 
tractor.  My son says he's
not sure the tractor is Bosch but for sure the engine is.  The neighbor uses 
a blow torch to start
it. It uses #6 diesel.

My son said the tractor is too large to fit through the door to his barn 
(his Boomer w/cab just
barely clears the top of the door opening).  He says this old tractor is 
really big.  I cannot wait
to see the pictures.

I cannot find a single hit on the internet for a Bosch tractor.  Anyone know 
if Bosch ever made a
tractor?

Any experience with hot bulb engines?

Thanks

Dick

_______________________________________________
AT mailing list
http://www.antique-tractor.com/mailman/listinfo/at

_______________________________________________
AT mailing list
http://www.antique-tractor.com/mailman/listinfo/at


-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2014.0.4577 / Virus Database: 3931/7439 - Release Date: 05/04/14