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Post by Big-birds-ride on Mar 24, 2013 21:13:35 GMT -5
I know that a couple of the local 'gods' are mechanics. My voltage regulator quit on me, and I am considering changing out the Regulator/Alternator combo for a single wire Alternator (Chrome) with an internal regulator.
What to I need to consider in making this swap, and do I need to keep the old regulator in place as there are at least several additional wires that are connected to it.
The regulator is a four wire type, for GM motors.
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Post by Dan MacMillan on Mar 24, 2013 22:08:01 GMT -5
I am assuming this is on a Corvair engine.See this link www.unm.edu/~geoffj/Vair/Alternator.htmlIf your engine has been recammed to run backwards make sure you have the proper reverse direction fan on the alt. |
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Post by Big-birds-ride on Mar 25, 2013 7:36:39 GMT -5
Thanks, the link provides all the information I needed.
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Post by Big-birds-ride on Mar 25, 2013 12:50:25 GMT -5
I am assuming this is on a Corvair engine. If your engine has been recammed to run backwards make sure you have the proper reverse direction fan on the alt. I actually have not paid any attention to whether the engine was re-cammed to run backwards. Had to research that subject. Stock corvair engines run Counter Clock Wise. The transaxle may have had the ring gear flopped over, easier to do by far than reversing the Corvair engine. It does put more stress on the vw transaxle to run backwards. I will have to go crank it up and watch which way it spins. |
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Post by Big-birds-ride on Mar 25, 2013 12:53:16 GMT -5
The article also suggested replacing the old V Regulator with a junction box like the ones on a Chevy S10. Good idea.
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Post by jspbtown on Mar 25, 2013 13:44:12 GMT -5
Do you have a swing axle?
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Post by Big-birds-ride on Mar 25, 2013 18:40:26 GMT -5
Do you have a swing axle? I have an IRS transaxle, the one with the skinny axle and the trailing arms. |
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Post by Big-birds-ride on Mar 25, 2013 20:57:53 GMT -5
Started her up and my corvair engine runs clockwise, which means it is running in the opposite direction from stock so that it is turning in the right direction for the VW transaxle. That is the more expensive way to do it.
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Post by Dan MacMillan on Mar 26, 2013 5:10:44 GMT -5
Also makes more power running backwards.
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Post by TexasIceMan on Mar 26, 2013 8:30:38 GMT -5
Ok, I'll bite. How does the engine produce more power when it is running backwards? The displacement is the same. It must be in the fuel system? Perhaps timing?
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Post by jspbtown on Mar 26, 2013 9:24:29 GMT -5
I didn't think you could swap the ring gear on an IRS so that makes sense that it is running backwards.
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Post by Big-birds-ride on Mar 27, 2013 16:34:27 GMT -5
OK Some more help needed from the mechanics in the club. Given that my corvair is running reversed, I can swap the cooling fans. Do alternators need to run in one specific direction to function? It seems like they should work either direction with the correct cooling fan. The alternator puts out alternating current so I seems that it should send the current either way.
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Post by Dan MacMillan on Mar 28, 2013 12:15:29 GMT -5
Alt does not care, fan does. Needs alt fan not gen fan, if you need one go to a wrecking yard or a local rebuild shop. Also make sure you have a deep pulley on the alt. I got all my parts to rebuild a stock vair alt including the necessary fan and fan spacer at the rebuild shop to run backwards. Proper fan for reverse rotation from www.corvair.com/user-cgi/catalog.cgi?function=next My reverse rot engine.  |
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Post by Big-birds-ride on Apr 30, 2013 9:13:19 GMT -5
Alt swap complete, did some re-wiring where old wires had cracked sheaths. Charging like it should.
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Post by cocacoladodge on Apr 30, 2013 10:15:59 GMT -5
HOW DOES A ENGINE RUNNING BACKWARDS MAKE MORE POWER?  ? |
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Post by Dan MacMillan on Apr 30, 2013 13:16:41 GMT -5
Simple, the reverse rotation cams have a better cam timing. Please turn the caps lock off. Caps on is SCREAMING.
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Post by Big-birds-ride on Apr 30, 2013 16:44:39 GMT -5
HOW DOES A ENGINE RUNNING BACKWARDS MAKE MORE POWER? ? I can understand the question. I have done some research on this since I found out my Corvair engine is running in reverse of stock. Dan is correct, the reverse cam lobes do a better job both on valve opening/closing as well as the gears that drive the distributor. Interestingly, many of the websites that talk alot about reverse rotation Corvair engines have to do with using the corvair engine as an airplane motor. |
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Post by TexasIceMan on Apr 30, 2013 17:34:26 GMT -5
Dan, thanks for answering that question. I still find it interesting that the cam timing would make that much difference.
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Post by Dan MacMillan on Apr 30, 2013 18:56:50 GMT -5
That is why Hi perf VW cams use an adjustable cam gear. Also many new cars are being equipped with variable valve timing allow for more optimum engine performance, reduced emissions, and increased fuel efficiency compared to engines with fixed camshafts.
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