Ducati 748 - Road to track/road

From a simple respray to a full blown rebuild or restoration, post some pics in here so we can all admire your work.

Re: Ducati 748 - Road to track/road

Postby duke63 » 12 Mar 2017, 19:06

One thing i found out today when i asked the seller about it, apparently the engine has had the flywheel removed completely. Not sure if that is relevant.
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Re: Ducati 748 - Road to track/road

Postby C00kiemonster » 12 Mar 2017, 19:23

Was it created as a road engine or purely for race? That would explain some of the stalling i guess.

TPS and clutch check might well be in order though.
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Re: Ducati 748 - Road to track/road

Postby duke63 » 12 Mar 2017, 20:00

I believe it was built as a track engine but it ticked over fine on the drive today which it wouldnt even do beforehand so there is some progress. I'm wondering about poor fuel, the tank being removed and emptied and also obviously the TPS. It does smell as if the fuelling is a bit rich and the mapping on it is for a bike with bigger exhausts.

I'm sure we will get there in the end. JHP seemed to think they could fix it.
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Re: Ducati 748 - Road to track/road

Postby Blade » 12 Mar 2017, 21:51

Duke if the engine has been mapped for a larger bore exhaust then obviously the fuel map is far from ideal in your application and needs looking at.

With respect you cannot take anything from it smelling rich. Even if it is rich it may only be at one point in the rev range and this is what you can smell. The majority of the Rev range may have weak AFR but you smell one point in the rev range where it is rich and assume it's too rich everywhere. Even an engine set up as close to perfect on a dyno will not have a constant AFR across the full rev range. At some points on the curve it will be above 12.7:1 and if other parts below 12.7:1. Plus smelling richness is hardly scientific.

I would get it to JHP and get the TPS set and then get it mapped specific to your exhaust and what you want from the engine. TBH I'm very surprised this wasn't done already as it's essential to having a smooth running engine.

JHP are the experts and always look after you. We will never fix it by adjusting the idle or smelling it. Pop into JHP and I'm sure they can fix it for you.

Nothing meant negative mate and trying to help but it needs setting up by someone who knows what there doing and has the correct specialist equipment to set it up.
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Re: Ducati 748 - Road to track/road

Postby Blade » 12 Mar 2017, 22:05

If it was a race engine it was most likely set to idle about 3000 rpm and if this is the TPS zero and you now want it to idle at 1300 rpm no wonder it doesn't like it.

Racers often set the idle very high, typically 3000 rpm so even on a closed throttle it is still getting drive which helps maintain stability.
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Re: Ducati 748 - Road to track/road

Postby Deegee » 12 Mar 2017, 22:24

Blade is bang on, smelling unburnt fuel in one place in the rev range is not much to worry about, at very low speeds it's fairly normal - I suspect what you're smelling is the result of a large chunk of the incoming fuel/air charge disappearing through the exhaust valves due to valve overlap, the more highly tuned an engine is the more likely the camshaft is to have an exaggerated valve overlap.

It all comes right when the engine is up in the power band, but that overlap and the extra power it can give could also mean a poor or non-existent low speed idle, it can be one of the reasons race engines normally have a higher idle speed.
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Re: Ducati 748 - Road to track/road

Postby DaytonAndy » 12 Mar 2017, 23:31

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Re: Ducati 748 - Road to track/road

Postby Blade » 14 Mar 2017, 09:09

D6Nutz wrote:I was thinking the same as kk, I sometimes get this with the rsv. It's almost like sometimes it forgets to idle, but I know my clutch fluid is well over due a change


Nutz get yourself some 7mm hose and a jam jar.

You will have that clutch fluid and all the brakes bled in 30 minutes. I did mine yesterday. Probably one of the easiest and most beneficial jobs out can do (lol)
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Re: Ducati 748 - Road to track/road

Postby duke63 » 24 Mar 2017, 18:16

Sunshine dry and warm. Too good an opportunity to miss. Leathers and summer gloves. Bliss.

Its a bit feisty :D Front wheel seems to be very light. :D

Just need to get the stalling issue sorted and all will be well. It pulls like a fecking train.
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Re: Ducati 748 - Road to track/road

Postby C00kiemonster » 24 Mar 2017, 19:54

duke63 wrote:Sunshine dry and warm. Too good an opportunity to miss. Leathers and summer gloves. Bliss.

Its a bit feisty :D Front wheel seems to be very light. :D

Just need to get the stalling issue sorted and all will be well. It pulls like a fecking train.


I guess it's a pretty light bike? What do they weigh?

Sounds good to me (y)
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Re: Ducati 748 - Road to track/road

Postby duke63 » 24 Mar 2017, 20:18

I don't think they are especially light but the weight is balanced well and the new lighter motor makes turning noticeably easier.
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Re: Ducati 748 - Road to track/road

Postby Kwacky » 24 Mar 2017, 22:00

It's there to be enjoyed mate.
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Re: Ducati 748 - Road to track/road

Postby duke63 » 24 Mar 2017, 22:53

Well impressed by the Diablo Rosso 111 tyres today. More than enough grip and very nice turn in too. Didn't need much effort to turn but didn't fall into turns either.
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Re: Ducati 748 - Road to track/road

Postby duke63 » 25 Mar 2017, 19:59

Recovered seat picked up this afternoon. :)

2017-03-25 18.48.38.jpg
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Re: Ducati 748 - Road to track/road

Postby Kwacky » 25 Mar 2017, 20:27

Yep, That's on the mark. It gets my nod of approval.
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Re: Ducati 748 - Road to track/road

Postby Itchy » 25 Mar 2017, 22:14

Image
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Re: Ducati 748 - Road to track/road

Postby Blade » 26 Mar 2017, 07:06

Very nice Duke 8) it's the detail on a special that makes it truly stand out (lol)
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Re: Ducati 748 - Road to track/road

Postby duke63 » 26 Mar 2017, 21:05

Seat fitted. Bike lines are much cleaner without the original mirrors.

2017-03-26 13.15.52.jpg


2017-03-26 12.33.51.jpg


2017-03-26 13.23.43.jpg
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Re: Ducati 748 - Road to track/road

Postby Kwacky » 26 Mar 2017, 21:18

I'm not overly keen on the mirror but it doesn't distract from the beauty of the bike.
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Re: Ducati 748 - Road to track/road

Postby rocket » 27 Mar 2017, 20:07

I actually don't mind the original mirrors and think they suit the bike.

The bike is looking very sexy though (h) (h)
"80mph" sorry officer I possibly could not have done that I'm no Valentino Rossi.
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