true my friend, but what kind of torque output do you see on those high revving engines? again, me being bitter. i mean look at the accord v6 engine...GREAT engine with tons of reliability, but compared to other V6's with the same size, they still have relatively low torque output.

 

Thats because they are designed that way. Honda has their niche, and they're not trying to design out of it. Do you know the kind of stress high rpm puts on a motor? Things are much more prone to stretching. Honda doesn't need to build high torque/high displacement motors to make power, but that is why they rev high. I'm sure you know the equation for calculating horsepower, so I don't need to get into that.

 

Line crossed.

Do you have any idea why this is or are you just spouting off?

 

Yes I know, I was responding to dubcac the engineer. I wasnt bad mouthing the av6 engine in anyway. just stating a point.

dubcac has seen enough of posts through my time here on HAN that I'm mainly bitter that honda is sticking to their "niche" of fwd cars and relatively low torque output with no end in sight. but theres a slight ray of hope in the rdx power train.

 

No, I don't think you do know. Now you have 98coupev6 the engineer. Why is it that the J30A1 has such poor low end torque output?

 

It seems that I've offended you somehow. I wont even bother my explanation, in an effort to keep you from getting upset. I dont have a doubt in my mind that you know more about your J30A1 than I do, so please enlighten me, and anyone else reading this thread. thanks

 

Right.

It's due to three main factors: conservative VTEC system, conservative ignition timing, and conservative air/fuel management. The J30A1 uses an economy VTEC mode below 3500RPM which is designed to save fuel. It opens only one intake valve on the low cam. Also, the ignition timing is extremely conservative for this type of engine. Because the J30A1 has no MAF sensor (unlike the J30A4, which fixes all of the J30A1's downsides), it's unable to properly adjust the air/fuel ratio to provide for optimal power. Finally, the J30A1 has a pretty low compression ratio and runs pig rich most of the time. I don't feel like explaining any further But it has very little to do with it just being a Honda engine. Had they gone more agressive on the low cam, advanced ignition timing or raised the CR, the engine would have much better low end torque output but would likely use more fuel at highway cruising speeds. I routinely get low 30's highway. Yes, the GM 3800 also sees those numbers, but it also has much higher gears. The J30A1 used a stupidly high 4.2 final drive ratio and a 0.61 4th gear. The 3800 uses a 3.05 final drive anda a 0.70 4th gear.

 

I'm assuming the J30A4 is the 03-06 Accord V6 Engine?

I'll admit that I didnt know all that you just posted. But I was going to touch base on the topic of economy/mileage/ignition/ecu related etc. butttt my only quirk is, if Honda intentionally reduced torque knowing they could have eeked more out of the setup, then why did they choose a higher (numerically) final drive (a common honda "niche" to make up for lack of torque)?

 

iirc, 03-05 is j30a4, and 06 is j30a5

 

werd