Hey guys could you provide me with some experienced information to understand the cubic inch thing on the bore kits.88 cubic inches (1450cc) to 95 cubic inches (1550cc).Stage II (SE-203) cams.Functionality, horsepower, etc.Just looking to understand what this would do for a 06 Streetbob, Vs. the 07 efi (96) engine. Any info would be great.

JK

 

a stock '07 96" is producing slightly higher numbers than a stock 88" from previous years (mid to high 60's). If you do a stage II 95" to an 88", you will be producing numbers in the high 80's to low 90's for both hp and tq. If you port the heads as well, you will be approaching the 100/100 arena.

I have a stage I 95" kit (stock cams) on my '05 Wide Glide and I am producing 80hp/88tq (with a PCIII and V&H Propipe). The cam in the stage II kit would push those numbers up a bit, but I'm not positive by how much, so take my numbers up above as generalizations.

Most reports I have seen for folks doing a basic stage I for an 88" motor are producing mid to high 70's for hp/tq. There is one person on this site, can't remeber his username, that is reporting a dyno run of numbers at or better than mine with a basic stage I on an 88" - personally I think his dyno tuner tweaked the numbers to make him fell better about the build, because of the hundreds of folks that have done a stage I, these are by far the most impressive numbers I have ever seen.

I have not really been paying attention to what difference a cam change will make to the new 96" motor. I would expect a cam change, along with intake and exhaust change, for the numbers to be close to the 90/90 range... higher with head porting.

The reason, and someone correct me if I am wrong, that the 96" isn't producing much more power than the 88" is because the actual bore was not changed, it was the stroke. The chamber size where the explosionis taking place on the compression stroke is the same... its just pushing the piston farther away.
The huge advantage the 96" has over the 88" is that it was the stroke that was changed. Upgrading to 110" does not require cracking the case open and installing the "stroker" kit... its just a top end change, similar to the 95" kit for the 88" stock motor.

 

thanks, for the info....

 

Cubic inches are essentially the same (95 vs. 96). But the 96 makes the power with a longer stroke, which should give it more torque. A longer crank throw acts like a longer lever. The advantage is more low end torque, but less high rpm power - a pretty good trade off, IMO.

Upgrading the 88 to 95 cubes gives you the oppurtunity to make an important change. You can increase the compression ratio. If you live at high altitude, this is important. At sea level, not so much.

As for the cam, that's a tried and true way of making more power with any displacement. The 203's are a little mild, IMO. I use 204's, which I like. At the time, SE was the only thing available for the 06 Dynas. If I were to do it today, I would probably go with an Andrews or S&S cam.

My bike makes nearly 94 ft/lbs of torque at a fairly low rpm. Perfect for a street machine. It's pretty quick, and will easily run to 100+. Lot's of torque for heavy duty riding: passenger, luggage, windshield, passing uphill at high altitude at 80+ mph.