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Old 07-03-2005, 11:39 AM
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blower problem

i swaqped out my 8 - 71 blower from a 1982 el camino into a 67 camaro - 6 speed. it ran find in the camino new motor in the camaro with the blower. the motor was built just for the blower. we changed the blower from underdriven to over driven. the problem i have now is after 30 minutes or driving the blower is jamming. after the first time took it all apart and spec the clearences. everything is perfect. yesterday driving it home it jammed again. the questions is being overdriven now could it be expanding more becuase of the heat built up in it. or do i have another problem. bearing and everything inside are in perfect shape. nothing worce then driving a blower car with the belt off.

thanks again for all you help

john / fatrat96

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Old 07-03-2005, 02:50 PM
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I'd call JR at RBS Superchargers. www.rbssuperchargers.com Sounds like rotor timing to me.

Last edited by 56Maynard; 07-03-2005 at 03:05 PM.
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Old 07-05-2005, 06:37 AM
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Sounds like a rotor problem. I'd check with the guys at The Blower Shop 661-299-5483.
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Old 07-05-2005, 07:00 AM
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If the blower is jamming is it breaking the belt or stopping the motor? Where are you checking the clearances? If your checking on the leading edge which would seem most logical then your checking the wrong place. How much over driven are you running? Sounds to me your turning the blower too fast for the way it was setup with its clearances. Also the damage is not going to be seen in the middle of the rotors, damage usually occurs on the outside edges.
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Old 07-05-2005, 02:25 PM
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You're not over-torquing the mounting bolts or not torquing them in sequence? Belt too tight? If it turns over when cool probably not but if clearances are tight a little heat may be making things really tight. Just funny it was fine in the first car and no changes to the motor when you swapped it into the other. If it's seizing while being driven there must be some scarring visible on the rotors or case inside.
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Old 07-05-2005, 03:27 PM
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Whatever the problem is you would want to fix it ASAP. You are going to be buying a new crank if you don't. I second the opinion of the belt possibly being too tight or the blower to manifold studs are too tight. I don;t have my specs in front of me, but the nuts that hold the blower down should only be tightened to 12in lbs (or something like that) I can look it up if needed. If you over tighten them you will cause the case to warp (which could cause the problem you are having). Your belt should be adjusted with plenty of play 1" when cold. The blower grows a LOT when it gets warm, you can see this by how tight the belt gets once the engine is warm. I don't think it's a bearing problem and hopefully you haven't damaged the rotors or case. Rotor phasing should be left to the pro's (in my opinion). I watched Don Hampton (Hampton Blowers) build my blower and a LOT more goes into than meets the eye.

Good luck and let us know what you find.

Royce
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Old 07-05-2005, 07:28 PM
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it just stop the engine. first time it did it i was coasting in to the parking lot and it died. when we tore it down the main rotor was hitting the back plate. it put a little grove in the back case. we cleaned everything and but it back to spec with .018 between the rotor and the case. when it did it saturday it was after 30 minutes of driving and it stopped again as i was slowing down for a red light. i talked to a blower man here in miami today and he said the rotors need to be timed if this makes any sense. i going to pull it apart and take it over to him before anythign breaks big time. plus i am going to turn it back to be underdriven the way it was before. the belts is set to one inch as spec and the bolts are tighten as spec.. it is crazy why it takes 30 minutes of driving before any thing happens. up till then the car runs perfect. no funny sounds at all. the motor temp is around 180. it is coming apart wednesday. will let you know
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Old 07-05-2005, 08:28 PM
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The rotor phasing/timing is a big deal. If you took it apart I can almost assure you the rotor timing is off. Why it happened the first time is anyones guess. Since you went from under to over driven you are creating a lot more heat, this will cause the blower to grow. With the added heat that could explain why it locks up after it gets warm (30 minutes).

Let us know what the blower man finds.

Royce
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