Sintered steel oil pump gears - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 10-29-2007, 01:52 PM   #21
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I got the billet gears for my motor. I'll pass on the pulley. I think as long as you get your bottom end balanced the need for the pulley is greatly reduced. My bottom end is balanced past 10k rpm.
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Old 10-29-2007, 02:17 PM   #22
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I'm seriously getting tired of spending money on this ******* motor.
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Old 10-29-2007, 02:25 PM   #23
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<7200 rpm rev limit & <275 whp neither the damper or gears matter

I'm planning on 7600 rpm rev limit, as I understand the 99-00 valves can get floaty after that.
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Old 10-29-2007, 02:26 PM   #24
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Quote:
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<7200 rpm rev limit & <275 whp neither the damper or gears matter

I'm planning on 7600 rpm rev limit, as I understand the 99-00 valves can get floaty after that.
a buddy of mine bent a valve at 8k a few months ago on a missed shift.
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Old 10-29-2007, 02:32 PM   #25
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In a miata?
How does that happen with a non interference head? Is the head shaved or does he have a more aggressive cam, something along those lines?
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Old 10-29-2007, 02:38 PM   #26
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In a miata?
How does that happen with a non interference head? Is the head shaved or does he have a more aggressive cam, something along those lines?
I think it has stock cams. I don't know how it happens, but I assume the valve leaves the cam lobe. I was there when the head came off, and saw the slightly bent valve...bent just enough to not seal.
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Old 10-29-2007, 02:39 PM   #27
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He must have over reved it or something. If you are sticking with the tock redline I don't think you need to worry about the gears. I'm gonna rev mine to the moon though.
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Old 10-29-2007, 02:43 PM   #28
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He must have over reved it or something. If you are sticking with the tock redline I don't think you need to worry about the gears. I'm gonna rev mine to the moon though.
I stated in that post that he bent the valve at 8k on a missed shift.
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Old 10-29-2007, 02:43 PM   #29
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It depends on what you want done. There are a million different combos of heat treatment, let alone what metal to start with. First I would find what stock is and then figure out what you want.

Atlanta might be better suited for this. Assuming there is no impact loading I can help you. The equations are very simple and easy to follow. This weekend I will grab my books
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Old 10-29-2007, 02:58 PM   #30
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The only thing that stopped me from getting them was the 2-3 week wait on them i was like WTF 2-3 weeks for a oil pump and it is 500$ nah
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Old 10-29-2007, 03:16 PM   #31
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whoever is making these, ask him how he does it. I cant imagine he actually setup tooling for this.
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Old 10-29-2007, 03:21 PM   #32
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unless has has a cnc machine
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Old 10-29-2007, 03:24 PM   #33
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he has them made in sets there is a thread on m.net he gets billet blanks made then has them heat treated etc. it is a long proccess from what i see but after the first few sets i would think he would keep 2-3 sets on hand.
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Old 10-29-2007, 03:27 PM   #34
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They really are nice
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Old 10-29-2007, 03:35 PM   #35
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no doubt they are but it is'nt as if this is his first few sets of them he has been selling them for more than a year.
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Old 10-29-2007, 03:40 PM   #36
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He doesn't just stock them though because its not like there is a huge demand for them either. Not many people pay out for the head work required to even support the revs it can handle. Send Bill an email and see if he has any if you want them.
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Old 10-29-2007, 03:44 PM   #37
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http://forum.miata.net/vb/showthread...5&page=1&pp=25
explains the process, fairly involved. I'm sure they're top notch.
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Old 10-29-2007, 03:52 PM   #38
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I have and did the last time i pulled the motor i was gonna need to wait a week for parts from trussville so i asked him and he gave me that so many weeks stuff. I thought hmm i send this guy 500$ for a oilpump they put good gears in and it will take a month for me to get them? he must have the gears already made so the main issue is the install on the oil pump from what i think. If it takes a week to lap in a set of gears that does not sound like a good deal. ya know.
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Old 10-29-2007, 04:04 PM   #39
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That is an expensive process, I bet hes making lil' money on it. Wire EDM is amazing, we used it to make the splines on our Baja vehicle. Labor and time intensive (to set up) im surprised their EDM is open enough for him to make a few sets like hes done.

I bet we could make one cheaper, but probably not better for equal quality i would go with his. Cryo treating would be our only option, any heat treatment would lead to machining and then you are better off with his option.


Im thinking we look at options to improve the stock gears that will not require re machining.
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Old 10-29-2007, 04:08 PM   #40
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He does not have the gear just sitting on a shelf..... They are made usually on a per order/group buy basis because of the large investment involved. I put mine into an ebay oil pump since I was measuring clearances anyway. I just needed to enlarge the smaller guide hole on the pump body by about 0.002", everything else checked out perfectly. The gears turn in the pump without and binding whatsoever.

As for the time it takes to get them made once the gears themselves are done, it is not entirely up to him. He has someone make the gears and someone install them in the pump. He is just to one that sets everything up. Basically a contractor if you want an analogy.
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