MY FIRST POST... ENGINE QUESTION??

[Yamaholic]

First, I would like to say "Hello" to the moderators and all the SHO fanatics

My question involves our two sweet SHO "Yamahammer" engines. I've heard that there is absolutely "NO" difference between the 3.0L and the 3.2L, as far as performance goes. Is there actually "ANY" noticeable difference between the two, or is the 3.2L just a larger hammer shrug

 

[SHO_Driver]

There is a difference. You'll soon hear about it from the others.

 

[shojuan]

Yeah, there's a big difference. The 3.2 puts out more HP and torque at the crank than the 3.0. The 3.0 ratings that you saw in the magazines were at the crank numbers. The 3.2 were at the torque converter numbers. The laws of physics aren't broken and the old adage remains as true as it always was: There's no replacement for displacement.

 

[projectSHO89]

From the SHOTimes FAQ at www.shotimes.com:

Ford decided that additional low-end torque was necessary to work with the slushbox. The stall speed of the torque converter would have been too high with the 3.0, so Ford had Yamaha bore the engine to 3.2 liters (the bore went from 3.5" to 3.62"), bringing the torque peak down in the RPM range while increasing its magnitude. The 3.2 liter engine's torque peak is 215 lb-ft @ 4000 RPM, and the power peak is 220 hp @ 6000 RPM. The corresponding figures for the 3.0 liter engine are 200 lb-ft @ 4800 RPM and 220 hp @ 6200 RPM.

Steve

 

[yamahaSHO]

shojuan:
Yeah, there's a big difference. The 3.2 puts out more HP and torque at the crank than the 3.0. The 3.0 ratings that you saw in the magazines were at the crank numbers. The 3.2 were at the torque converter numbers. The laws of physics aren't broken and the old adage remains as true as it always was: There's no replacement for displacement.

With the 3.0 cams, the 3.2 puts out more HP. The stock 3.2 hits the peak hp and torque at a lower rpm.

<small>[ April 06, 2003, 10:19 AM: Message edited by: yamahaSHO ]</small>

 

[Yamaha V6]

In order to balance out the necessary increase in tq provided by the increase in displacement to handle the slushbox, the intake cam profile was reduced a smudge (.015", IIRC). That's worth about 5hp, based on SHO Shop's claimed 15hp gain from the .040" increase in the Stage 1's.