~350hp + factory oil pump + underdrive pulley = .... (not 56k friendly)
#25
Here is the real question for us to scratch our heads over.
If you lighten your crank (ie. knifedge*spelling) is it more likely to increase crank flex ,decrease or stay relatively the same. Common sense tells me, less metal=less strength=more flex. But I could be wrong. It is something I've been wanting to do, but I'm starting to change my mind.
Stealth-As far as clutch goes, I'd rather have a balanced assemby to begin with and then go slightly out of balance then have an unbalanced assembly from the start.
High performance OEM cars get their rotating assemblies balanced with the clutch assembly attached, so why wouldn't I?
#26
That's what I was planing on, I might as well do it since it is all gonna be out there anyway.
Here is the real question for us to scratch our heads over.
If you lighten your crank (ie. knifedge*spelling) is it more likely to increase crank flex ,decrease or stay relatively the same. Common sense tells me, less metal=less strength=more flex. But I could be wrong. It is something I've been wanting to do, but I'm starting to change my mind.
Here is the real question for us to scratch our heads over.
If you lighten your crank (ie. knifedge*spelling) is it more likely to increase crank flex ,decrease or stay relatively the same. Common sense tells me, less metal=less strength=more flex. But I could be wrong. It is something I've been wanting to do, but I'm starting to change my mind.
#28
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Dan, when you lighten the crank you take material off in areas that won't (or shouldn't) reduce it's strength. And because the crank is now well balanced, you should suffer less harmonic/imbalance issues.
#31
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soft rev limit is set to 7000 and hard is set to 7200. typically i never rev it out that far, I don't have to. but the car was breaking loose like a ************ in 2nd and raping the rev limiter when it happened.
#32
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evidence here http://www.miatamob.org/speakeasy/in...ic,1741.0.html
jk Bruce.
#36
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actually that bolt was not in place. When I originally removed my AC and that godforsaken iron bracket I replaced that bolt. But last summer we put a 99 motor in my car and I noticed when removing it that that bolt was not there.
Whats your theory?
Whats your theory?
#37
Paul, that bolt is the primary support for the left side of the oil pump.
The alternator bolt supports one side and that one supports the other side.
I am thinking that some of these pump failures are caused by that missing bolt. Since the pump is not tightly secured, it starts moving around at high rpm causing the gears to shatter.
Look at the size of the boss on the pump that the bolt fits...that bolt was meant to support the pump!
Try something...when you start putting it back together, tighten all the other bolts up on the pump and leave that one out. Then install that one and notice the clamping force and the movement of the pump.
I have been racing/building Miata engines for a long time, and I have seen this issue many a times.
Tony
The alternator bolt supports one side and that one supports the other side.
I am thinking that some of these pump failures are caused by that missing bolt. Since the pump is not tightly secured, it starts moving around at high rpm causing the gears to shatter.
Look at the size of the boss on the pump that the bolt fits...that bolt was meant to support the pump!
Try something...when you start putting it back together, tighten all the other bolts up on the pump and leave that one out. Then install that one and notice the clamping force and the movement of the pump.
I have been racing/building Miata engines for a long time, and I have seen this issue many a times.
Tony
Last edited by mrtonyg; 05-02-2008 at 10:45 PM.
#40
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Paul, that bolt is the primary support for the left side of the oil pump.
The alternator bolt supports one side and that one supports the other side.
I am thinking that some of these pump failures are caused by that missing bolt. Since the pump is not tightly secured, it starts moving around at high rpm causing the gears to shatter.
Look at the size of the boss on the pump that the bolt fits...that bolt was meant to support the pump!
Try something...when you start putting it back together, tighten all the other bolts up on the pump and leave that one out. Then install that one and notice the clamping force and the movement of the pump.
I have been racing/building Miata engines for a long time, and I have seen this issue many a times.
Tony
The alternator bolt supports one side and that one supports the other side.
I am thinking that some of these pump failures are caused by that missing bolt. Since the pump is not tightly secured, it starts moving around at high rpm causing the gears to shatter.
Look at the size of the boss on the pump that the bolt fits...that bolt was meant to support the pump!
Try something...when you start putting it back together, tighten all the other bolts up on the pump and leave that one out. Then install that one and notice the clamping force and the movement of the pump.
I have been racing/building Miata engines for a long time, and I have seen this issue many a times.
Tony