BHR builds another engine for Mazdamaniac. LIVE
05-06-2010, 10:32 AM
#28
Quick synopsis:
When Easy and I built the last motor (after over-heating the previous motor on the track), we were forced to use a LOT of really questionable parts because side-seals were on back-order, so this motor was a stop-gap, anyway.
But what did it in was a chain of events that propagated from my mis-installation of one of the front eccentric shaft thrust bearings, which I got pinched and was subsequently destroyed.
When I noticed the sudden increased e-shaft end=play, I tore down the front cover and replaced the bearing, but the bigger damage was already done (though I didn't know it).
The rotor bearings had already "walked" and the front main bearing in the stationary gear was toast.
This was almost a month ago.
On Sunday, I was late to grid for my third session - I was picking up a passenger.
The motor was cold, I floored it in turn 5 to catch the pack, hit a 16 PSI boost-spike (which wasn't what did in the motor) and then it coughed.
The loose clearances from the battered bearing plus the sudden punch in the sack from the over-boost put the front rotor on a slightly elliptical patch, causing the corner to catch the inside housing, break off a chunk and embed it in the steel, which subsequently tore off the other two corners, which made a ****-storm in that chamber, destroying everything.
After sitting in the paddock for a few hours, it started right up and I drove it the 40 miles home on the freeway at 75 MPH, which required a constant 7000 RPM and 4 - 8 PSI of boost.
It didn't overheat. lol
When Easy and I built the last motor (after over-heating the previous motor on the track), we were forced to use a LOT of really questionable parts because side-seals were on back-order, so this motor was a stop-gap, anyway.
But what did it in was a chain of events that propagated from my mis-installation of one of the front eccentric shaft thrust bearings, which I got pinched and was subsequently destroyed.
When I noticed the sudden increased e-shaft end=play, I tore down the front cover and replaced the bearing, but the bigger damage was already done (though I didn't know it).
The rotor bearings had already "walked" and the front main bearing in the stationary gear was toast.
This was almost a month ago.
On Sunday, I was late to grid for my third session - I was picking up a passenger.
The motor was cold, I floored it in turn 5 to catch the pack, hit a 16 PSI boost-spike (which wasn't what did in the motor) and then it coughed.
The loose clearances from the battered bearing plus the sudden punch in the sack from the over-boost put the front rotor on a slightly elliptical patch, causing the corner to catch the inside housing, break off a chunk and embed it in the steel, which subsequently tore off the other two corners, which made a ****-storm in that chamber, destroying everything.
After sitting in the paddock for a few hours, it started right up and I drove it the 40 miles home on the freeway at 75 MPH, which required a constant 7000 RPM and 4 - 8 PSI of boost.
It didn't overheat. lol
![mike[piston eater]'s Avatar](https://www.rx8club.com/avatars/mike%5Bpiston-eater%5D-48728.gif?dateline=1334247180)
05-06-2010, 12:20 PM
#32
Administrator
iTrader: (7)
It died on the track and thus it died a warrior's death.
Can't wait to see how this new motor comes out and compares to the last Franken-Motor.
Can't wait to see how this new motor comes out and compares to the last Franken-Motor.
or 200k miles
05-07-2010, 12:22 AM
#43
No, not exactly. MM drove the car home, pulled the engine by himself (because I am a primadonna Bitch) and he, Easy, and I decided what should be done. I then measured everything, set the gaps, we all assembled the engine, and MM shall commence destroying this engine, too.
One of the perks of being part of the BHR team.
One of the perks of being part of the BHR team.
05-07-2010, 12:38 AM
#44
Administrator
iTrader: (7)
****, I need to get my name on this list too!
05-07-2010, 02:28 AM
#46
Yeah, a BHR motor done up from square one really is a whole different animal than an OEM one...I really feel like I got that last 2-3% of power that contributes to a snappy throttle rather than a lazy one. And that is over an above the lightweight clutch, cause I drove bobby's too - and mine is still snappier.
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