100 ft lbs to the tire. Under 1200cc’s

[outthere]

Compared to stock XB with bolt on's what cost per ft - lb? Lot's of torgue @ 4000 revs might be nice on a track bike but oh my tire wear went right out the back.

[mike lowary]

This is definitely a ball park rough estimate. I think 3 grand would get you just the parts needed to for an 1170 build. i have way more money in my build but for the sake of the question we'll go with 3 grand. My bike dynoed at 65 wheel tq with k&n, open airbox and jardine exhaust right after i first bought it. IF i was to hit the 100 wheel tq mark on this motor it would be about 35 ft lb increase. Around 85$ per wheel torque. As you can see this is not a great bang for the buck deal. Yes you get waaay more bang but you have to pay to play.

[mike lowary]

full done 1050 with NO labor is about $3500. that includes header, tb, exhaust, air box lid etc. Add another $1500 to that for the 1170. and thats with no crank work.

[Cooter]

If everyone made good financial decisions, there'd be no racing.
Should be a sticker.

LOL.

Even in these days of seemingly effortless HP, building an NA engine is still quite the art form. I commend the people that can and do. 'Murica

[34nineteen]

Man it's gonna be CLOSE. Friend of mine built this XB a couple months back:
Attachment 13341
Attachment 13342

Just barely eclipses 100lb/ft. It is a 1275 kit but I really don't remember him doing anything extravagant to it. Nothing one-off custom for sure. Lots and lots of tuning.

Lots of them seem to live in the 80's unless there is a lot of work done.

Kind of like Cooter.

[outthere]

Now wondering what those numbers would be if it was a big bore XB12.

[34nineteen]

This is definitely a ball park rough estimate. I think 3 grand would get you just the parts needed to for an 1170 build. i have way more money in my build but for the sake of the question we'll go with 3 grand. My bike dynoed at 65 wheel tq with k&n, open airbox and jardine exhaust right after i first bought it. IF i was to hit the 100 wheel tq mark on this motor it would be about 35 ft lb increase. Around 85$ per wheel torque. As you can see this is not a great bang for the buck deal. Yes you get waaay more bang but you have to pay to play.

The issue is that you are already starting with a pretty hot rodded out motor.

If you were starting with a stock 883, there would be a LOT more payback.

[mike lowary]

Exactly. Well said my friend

[mike lowary]

Now wondering what those numbers would be if it was a big bore XB12.

Same modifications I have but starting with a 12 motor would get 88”. Peak torque would be higher. Redline would be lower obviously. Peak horsepower I’m not sure. I think it would be close but the 9 motor would probably get more peak hp because of rpms. Riding both bikes back to back with said motors would be completely different feelings.

[mike lowary]

The 12 would feel like you could pull a house down. The 9 would feel like the power band never stops.