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chuckinkona
Member
Username: chuckinkona
Post Number: 13
Registered: 07-2006
| | Posted on Thursday, August 30, 2007 - 03:08 am: | 
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Aloha Guys,
I am rebuilding a 1906/1907, near as I can tell, Brooks 4HP (Dubrie). I'm setting up a reverse engineered wipe arm timer (there was nothing there on the engine when I got it) and would like advice on what the spark advance range I should be setting up.
In other words, how much advance should I allow to be set by rotation of the handle. Also, would appreciate advice on how close I should try to get the detent holes (degree of engine advance per detent) on the rotating block that hold the contact that the wipe arm makes contact with.
And, lastly, I'd appreciate advice on what a typical no load, idle RPM would be. This is a single cylinder, 2 cycle, 2 port (maybe a 2/3 port) but basically it looks to me to be 2 port, with check valve, engine.
Looking forward to replies that get me in the ballpark, before making too much scrap, and/or having too exciting a time once the time comes to fire this baby up.
Mahalo,
Chuck |
jb_castagnos
Senior Member
Username: jb_castagnos
Post Number: 275
Registered: 07-2002
| | Posted on Friday, August 31, 2007 - 03:21 am: |
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Chuck, I have a drawing for an L-A timer that may help, will see if I can attach, if not will send it straight to you.  |
miro
Senior Member
Username: miro
Post Number: 291
Registered: 11-2001
| | Posted on Tuesday, September 04, 2007 - 07:19 am: |
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I think about a 15-20 degree retard and a 15 advance is about all that you'll need to get the engine working OK.
I'd keep the RPMs to less than 700 - 800 if I were you. Starting the engine with no load is always fun. Beyond that you might get into significant vibration problems. That last thing you want is an engine hopping around your shop. A kill switch that is real conveneient , is a good idea when starting it up initially.
miro |
chuckinkona
Member
Username: chuckinkona
Post Number: 14
Registered: 07-2006
| | Posted on Tuesday, September 04, 2007 - 01:50 pm: |
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Aloha JB & Miro,
Both of your inputs have been helpfull. Still a few more things to do on the engine, and then I'll give it a shot at coming back to life. One of the things to go is to secure the engine to a flatbet cart I have. Should eliminate the risk of it walking around.
Mahalo,
Chuck |
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