Bob. please please take some video of your run and put it up on google video. Id love to hear the A12 run at full tilt, nothing like that sound....

If you are not doing redline clutch dumping drag race starts and banging the tranny hard between shifts the H145 should hold up just fine.

I've never broken one even with a mildly built A15 (A15 block, midrange torque cam, A12GX head and Su carbs).

The thing that has caused me to trash 3 different H145's in autocross is lack of oil. The axel housing does not hold enough oil for sustained high G cornering. The oil exits stage left (or right) up into the axel tube leaving the gears high and dry. The gears run out of oil causing the the gears to spall. Keeps working but howels like a banshee.

Nissan sold a set of baffles to go in the axel housing to help keep the oil in the center of the axel. I went for the low brow fix and over fill the axel housing by a good margin.

One way to over fill is to jack the right rear wheel as high as you can then fill the axel. This fills the left axel tube plus the center dif section.

Last time I did the trick when the long studs were installed in the axels. Put 1 axel in, jack up the other side of the car and fill the axel housing via the open axel hole, then put the axel in. the oil level is up to the axels, maybee slightly higher. with lots of turns it gives you the effect of a differential cooler as the oil sloshes back and forth in the axel tubes...

Gary

Bobs Motor:

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well I think I have more torque than a mild a15.
with my a12 I wound launch the car @ 5500rpm with 8" wide slicks (pretty abusive) with the new motor with a wider power band I will launch at a lower rpm but knowning that The h145 is now my weak link I will try not to abuse it. I have the axle baffles installed. imay also go to 9.5" slicks for more traction

thanks for posting the pics B120Dat

an A12 NA can make 170hp???
a friend of mine made 190 hp atw on a conservitive tune with his boosted a14 and all i got was the bullshit call....

make up ur minds guys...
if a a12 na can make 170 hp at the fly
a lot more can be made by forced induction on a bigger motor...

Well, if you had 40mm intake valves ... we woulda believed it ...

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well this is no a12 it's 1400 in sheeps clothing

I can see an a14 boosted make 190 at the crank but at the wheels ???

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Sorry I mean in the face of the pistons.

dd: who needs 40mm valves when u have a gt28 running 14psi...

i am very impressed on the a12 power figure..