[AT] Hot Bulb Engine (tractor)

[Mattias Kessén]

Bolinder-Munktell made some in Sweden. Really cool. Most hot bulb engines
are stationary or boat engines though. My neighbour has one (Beijer made in
Astrid Lindgrens Vimmerby) for the saw mill he's constructing.

https://drive.google.com/file/d/0BwOWKH-zrCQBajhGOUJrQk9Wdkk/edit?usp=sharing

Mattias

www.rodjagard.n.nu


2014-05-04 22:11 GMT+02:00 Dean VP <deanvp at att.net>:

> 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
>
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