2.3 stroker vs RPM's

[kiggly]

Main bearing load is the main issue. This might be slightly different with the Eagle crank, I don't know if it has a little more counterweight or not.

I don't think I would go past 8500 with or without the girdle and unmodified main bearings. Slot all the main bearings for more oiling/cooling and they live a lot better. But, this only eliminates the bearing failure - the load is still all there. If I were shooting for a long life stroker in a street engine, I would probably keep it down to 8k unless it had some especially light parts. I don't know where things start coming out the side of the block for a race motor and although I will probably be going past 9k later this year, I hope to not find out.

BTW - thanks on the video Eric, I didn't know if anybody found it

Kevin

 

[red91gst]

We run our 2.3 in the pump gas car to 8750rpms all the time. Stock crank, manley rods, wiseco pistons, stock main bolts, no girdle. The motors been apart twice since it was built two years ago with no abnormal wear on the cylinder walls or bearings haha.

I'd consider this an unusual circumstance, since this car is a freak in so many ways.

 

[kiggly]

Yeah Nate, you don't count, nor does anything associated with that freak of nature car!

What kind of oil are you using and what do the Manley rods weigh? With Crower rods (600g) and wiseco 86mm pistons (~310g), my setup looked like somebody sprayed snot in the main bearings after only 9 passes going to 9k. This was using valvoline 50wt racing oil.

Kevin

 

[wortdog]

My Manley I-beams were around 205g on the small end and 488g on the large end, so, even heavier than the Crowers.

 

[Turbocharged]

You would be much better off putting your car on a dyno and seeing where you should shift. If your peak power is 7500 your not gaining anything by shifting at 8500. A stroker will move your power band lower due to the increased air flow per a stroke.

You are correct. Spin the motor where you have the greatest area under the dyno.

 

[red91gst]

Yeah Nate, you don't count, nor does anything associated with that freak of nature car!

What kind of oil are you using and what do the Manley rods weigh? With Crower rods (600g) and wiseco 86mm pistons (~310g), my setup looked like somebody sprayed snot in the main bearings after only 9 passes going to 9k. This was using valvoline 50wt racing oil.

Kevin

Haha, freak.

I'm not sure how much the Manley's weigh, I thought they were a little lighter than those Crowers. The motor has to come apart this week after our piston destroying boost control issue at the showdown , so I'll let you know! Apparently there is a big difference in combustion chamber temperature from 35psi to 42psi on pump. We run 20-50w Brad Penn Racing green oil, same stuff we run in Brent's car.

 

[redeclipse7782]

We run our 2.3 in the pump gas car to 8750rpms all the time. Stock crank, manley rods, wiseco pistons, stock main bolts, no girdle. The motors been apart twice since it was built two years ago with no abnormal wear on the cylinder walls or bearings haha.

I'd consider this an unusual circumstance, since this car is a freak in so many ways.

Any rebuilds to the head? How much boost are you running?