Bosch DU4
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Topic author - Posts: 121
- Joined: Sun Jan 06, 2019 8:04 pm
- First Name: Brendan
- Last Name: Doughty
- * REQUIRED* Type and Year of Model Ts owned: 16 , 21, 24, Touring , 24 Roadster, 26 Speedster
- Location: Central Wisconsin
- MTFCA Number: 15143
Bosch DU4
Has anyone run a DU 4 without an impulse coupling
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- Posts: 53
- Joined: Sun Jan 06, 2019 11:21 am
- First Name: harold
- Last Name: musolf
- * REQUIRED* Type and Year of Model Ts owned: 1911 touring 1926 touring 1913 touring
- Location: seattle
- MTFCA Number: 51354
- Board Member Since: 2010
Re: Bosch DU4
yes I have... we have 5 different cars with that mag and no impulse. 1912 Case, 1913 Case, 1911 Franklin and a '06 Franklin. I have also worked on a few early Buicks that are the same setup.
Harold.
Harold.
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- Posts: 12
- Joined: Wed Jan 09, 2019 9:48 am
- First Name: Frank
- Last Name: Harris
- * REQUIRED* Type and Year of Model Ts owned: 1913 Mountain Wagon
- Location: Long Beach, CA
Re: Bosch DU4
1912 Buick been running for over 60 years that I know of. Do you need a du4 ?
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- Posts: 327
- Joined: Fri Jan 04, 2019 10:18 pm
- First Name: Harry
- Last Name: Lillo
- * REQUIRED* Type and Year of Model Ts owned: Speedsters, racers, depot hack, coupe
- Location: Calgary
- MTFCA Number: 13996
Re: Bosch DU4
I have a 13 T speedster with a Bosch DU4 side drive/ no impulse. No starter so you have to flip it fairly quickly to start.
With the Sherman Superfire head and Winfield carb it was a bit tougher to start.
I changed out to a stock (milled) 13 head and Holley carb for the 2008 Centennial. Much easier to start now.
If you were using a starter there should be lots of cranking speed to fire the plugs.
I am setting up another DU4 to run with my RAJO 4 valve.
In my opinion the Bosch magneto is the best Model T ignition system I have used.
Harry
With the Sherman Superfire head and Winfield carb it was a bit tougher to start.
I changed out to a stock (milled) 13 head and Holley carb for the 2008 Centennial. Much easier to start now.
If you were using a starter there should be lots of cranking speed to fire the plugs.
I am setting up another DU4 to run with my RAJO 4 valve.
In my opinion the Bosch magneto is the best Model T ignition system I have used.
Harry
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- Posts: 1355
- Joined: Thu Jan 10, 2019 3:54 pm
- First Name: Kevin
- Last Name: Pharis
- Location: Sacramento CA
Re: Bosch DU4
Used to run a DU-4 on my ol’ 27 roadster with a Matco front plate without impulse coupling. Hand cranked the basically stock motor many times, and always started well.
Just a hunch... but I suspect many hard starting “ignition” issues are fuel related
Just a hunch... but I suspect many hard starting “ignition” issues are fuel related
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Topic author - Posts: 121
- Joined: Sun Jan 06, 2019 8:04 pm
- First Name: Brendan
- Last Name: Doughty
- * REQUIRED* Type and Year of Model Ts owned: 16 , 21, 24, Touring , 24 Roadster, 26 Speedster
- Location: Central Wisconsin
- MTFCA Number: 15143
Re: Bosch DU4
Thanks for the input. I have a few of them and thought I would rebuild one and give it a try.
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- Posts: 239
- Joined: Sun Jan 06, 2019 2:36 pm
- First Name: Shane
- Last Name: Lach
- * REQUIRED* Type and Year of Model Ts owned: 1927 Tudor and 1921 speedster in progress
- Location: Milford, NH
Re: Bosch DU4
I run a ZR-4 on my speedster with a starter and 9:1 compression. No impulse and starts up great.
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- Posts: 3384
- Joined: Sun Jan 06, 2019 11:39 am
- First Name: Tim
- Last Name: Morsher
- * REQUIRED* Type and Year of Model Ts owned: 1925TT, 1926 Martin-Parry bodied wagon, 1927 mercury bodied speedster
- Location: Norwalk Ohio
Re: Bosch DU4
I run 2 cross drive front plates with a DU4 and no impulse. Never a problem. I love them ! I am doing another and going to use a “from the front seat” starting mechanism, and no starter motor so I am going to install an impulse, 1) because I have one 2) it may help just a bit. Keep in mind, most impulse couplings are left hand or right hand, and a very few can be switched easily and go either way. Another thing to get your mind wrapped around. Same with the mag itself, the side drive turns opposite of the front drive.
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- Posts: 796
- Joined: Sun Jan 06, 2019 4:14 pm
- First Name: Joseph
- Last Name: Andulics
- * REQUIRED* Type and Year of Model Ts owned: 1926 Fordor, 1926 Truck, 1927 Roadster GOW, RAJO Sprint car
- Location: North Ridgeville, OH
- MTFCA Number: 9766
- Contact:
Re: Bosch DU4
Starting a Rajo with a DU4 and no impulse coupler. https://youtu.be/5vgjgQQmHds