| Author |
Message |
bruceknee (12.76.101.98)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, January 06, 2004 - 12:30 pm: | |
At the rally,I saw a gen that JayJay put together using a thermoking 4 cyl and a 7.5 (I think) Anyone else played with doing the same thing? I have found an Italian made 9k head for $400. I know to stay away from China stuff except for eggrolls every now and then.
Thanks, Bruce |
Richard Bowyer (Drivingmisslazy) (24.196.191.70)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, January 06, 2004 - 3:46 pm: | |
Bruce, one caution. The 3600 rpm alternators are extremely noisy. Most have a paddlewheel type fan and when the vanes pass the fixed portions of the frame, it acts similiar to a fire siren.
To reduce the noise a significant amount I used to dis-assemble the alternator, remove the fan, then bolt it back together and chuck it in a lathe. I then cut one inch off the radius to reduce the overall diameter by two inches.
I then made a bellyband with an opening approximately two inches wide by about six inches long to mount around the alternator. This allowed me to duct the hot air and noise thru a sound chamber. It makes a considerable reduction in the noise. This same procedure can be utilized on 1800 rpm units also.
The voltage regulation on the inexpensive alternators is very poor. It varies considerably with both load and rpm.
Richard |
bruceknee (12.76.101.165)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, January 06, 2004 - 3:47 pm: | |
The manufacturer is Pramac |
Jayjay (64.12.96.105)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, January 06, 2004 - 9:57 pm: | |
Mine is indeed a 7.5KW,(24/7 rating) with a short term high load rating of 9KW. Pay close attention to the bearing type. You may have to change them if it was originally set up for axial loads. Many heads don't have adequate bearings for the sideways load of a belt drive. Shoot for 60 Hz and the voltage will be on target automatically. My engine turns 1385 RPM, due to the overdrive gearing. On my installation the Isuzu diesel is so noisy, that the internally angled fan blades are not a factor. I'm lucky that it doesn't have the paddle wheel blades Richard warned you about. Don't use an automotive/truck engine, since the cam is much different, and you have to buy a governor separately. About $250.00 to $300.00. Why not look for a website for the mfg.- might be some tech info there. It ain't cheap either. To do development on this, I had to buy a digital infrared thermometer, a digital hand-held tachometer, and a digital frequency (Hz) meter that reads in hundredths of a cycle (two decimal points), though you may get by with one that does tenths instead. With luck you may get it built for under $2k and lots of frustration. Use schedule 80 pipe for the exhaust for the first 4 feet to really quieten that noise source. Good Luck. I'm available offline for help if you need it. jarjaje@wmconnect.com Cheers...JJ |
bob--m (68.35.160.48)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, January 06, 2004 - 11:45 pm: | |
I have a detroit 2-53 hooked up to a military surplus 15kw( also runs an a/c compressor, an alternator, an air compressor, and a hydraulic pump) |
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