Ducati Sporting Club UK > DesmoDue Race Series > DesmoDue - General Questions and Chat > Lack of acceleration possible Eng swap

[SeeleyG50]

Jeez Lee. Have you actually got around to setting up/dyno-ing the engine yet? A simple dyno run would/will reveal if all is well. Count the teeth on the primary gears to check what ratio you have. You can't re-bore Ducatis in the conventional sense! If the original honing marks have disappeared, then the bore is probably shagged (technical term).

[Lee M]

Hindsight is a wonderful thing. I original said to myself that I would run the bike on a dyno and that would prove if the acceleration problem was the engine or me. But the logistics of the dyno test against having a compression tester at hand in my garage didn't equal out.
I suppose this is where it all started to go wrong. Patients is a virtue and I went "bull headed" into stripping down the engine on the back of the compression test instead of running a dyno.
Lesson learnt.

[badgerpilot]

Here's another lesson.
Don't let a mint, proven, Ghostie fettled engine slip your grasp at the end of this season!

[milesaway]

Originally Posted by Lee M

Hindsight is a wonderful thing. I original said to myself that I would run the bike on a dyno and that would prove if the acceleration problem was the engine or me. But the logistics of the dyno test against having a compression tester at hand in my garage didn't equal out.
I suppose this is where it all started to go wrong. Patients is a virtue and I went "bull headed" into stripping down the engine on the back of the compression test instead of running a dyno.
Lesson learnt.

I wouldn't beat yourself up over that- if you did the comp test right and there was nearly no compression you know what the dyno would say without having to run it!

[Lee M]

So to recap I have stripped the top end, lapped in and reshimmed the valves. Checked the piston rings and bores, reassembled again carrying out a soft solder squash and setting the base gasket..... well today I took it for a dyno test, changed a faulty ignition coil which was causing a misfire
The read out was just got over 47bhp but was set to 46.7bhp to get a better torque curve.
Uhm.....what 4 bhp between friends when your a fat lad.

Mark No81 who has a standard 600 ss produced 46.8bhp.

Roll on Mallory!

[skidlids]

What's the cam timing set to Lee

[Lee M]

Hi Kev, it has standard timing set to the timing marks. My engine doesn't have adjustable cams.

[skidlids]

Before adjustable cam sprockets/gears they used offset woodruff keys to set the timing. Without measuring the cam timing you'll never know how far out it is or how close it is. I've found the factory's initial setup is often pants