Engine rebuild upgrade 748 to 916 - Ducati.ms - The Ultimate Ducati Forum
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post #1 of 27 (permalink) Old May 26th, 2008, 3:04 am Thread Starter
 
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Engine rebuild upgrade 748 to 916

Hi All,

I am planning a engine rebuild/upgrade for my '99 748. I plan on fitting a 916 crank, cylinders and pistons into my 748 engine to take it out to 916. I want a little more down low torque and the parts seem to be quite cheap to get a hold of.
The information I need is will a '95 916 crank fit into '99 748 cases, alternator gears, etc.

I have searched this site but could not find the specific info if the main bearing sizes, alternators, gears will will fit the cranks across the years.

Thanks in advance for any information that can be provided.

Ryno
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post #2 of 27 (permalink) Old May 26th, 2008, 3:24 am
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It will fit.. The 748 and 916 share the same case and most internals will fit straight across. BUT.. I´d go for a 854cc rebuild instead. a proper built 853cc/854cc will outdrag a stock 916, make roughly the same torque, but keep the high rev character of the 748. Doing a 916 rebuild will also require bigger valves to get the most from the diplacement. Givven the work needed, it would probably be cheaper and more reliable to buy a used/rebuilt 916 or 996 engine and bolt it into your existing chassie.

Here is a tech article on 748 to 850+cc upgrade if you decide to go that way.
853cc rebuild: http://www.sigmaperformance.com/748-853.html

The raceteam I´m apart of did a 999s engine transplant into a 748R chassie. Went without a hitch and the bike now makes 140+ rwhp.

//amullo

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post #3 of 27 (permalink) Old May 26th, 2008, 5:33 am
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A '95 916 has the single phase alternator and the '99 748 has (should have?) the 3 phase, I believe the crankshafts are different on the end where the alternator fits so you would need to use the '95 alternator which would require the '95-'98 crankcase covers and possibly the crankcase? not 100% sure on the details. A 996 crank would have the 3 phase alternator and the same stroke as a 916 but you wouldn't be able to use the cylinders as the stud spacing is different.

Agree with Amullo about just using the crank for an 853, otherwise probably cheaper (and certainly easier) just to buy a 916/996 engine.


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post #4 of 27 (permalink) Old May 26th, 2008, 8:40 am
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I have a nice used 916 engine I'd sell cheap if interested.

2006 Aprilia Scarabeo 250
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2003 Aprilia Falco 1000R (sold)
2001 Suzuki SV650S Track (sold)
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post #5 of 27 (permalink) Old May 26th, 2008, 9:28 am
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Do an engine swap. Less labour, thus less money and trouble. Straight bolt in, you could even keep your existing ECU etc by just swapping the EPROM. You should be able to get a 916 motor for 1000$ or less, a 996 motor for 1500 or less. 996 would retain your existing (better) charging system and give you some more power - 916s have, um, issues that you'll need to get used to. Might need the wiring harness as well though I'm not sure about that, there are sensor differences between pre 98 and post 98 models.

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post #6 of 27 (permalink) Old May 27th, 2008, 1:20 am Thread Starter
 
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Hey Thanks for the info, exactly what I was after!

I have considered the 996 engine swap and have found a couple of engines and still may go that way.

I am looking forward to doing an engine build as I have never had the chance to do a Ducati before and really like their "original" design and technology.

I have been pricing parts and the total to repair/rebuild mine is not that bad and I end up with a known quantity, where as buying an engine and bolting it in is kind of crossing your fingers unless I strip it first... then I'm back to square one. Thats why I was considering a crank swap, (found a 916 crank for $175) rebore my cylinders to fit 916 pistons then re-use my heads and do the eeprom swap. but if the crank wont fit my engine I won't worry about. But if I can find a 996 crank at the right price it could be an option for me to do a 916 build and still use my 3 phase charging system, cases, cylinders etc.

I am not looking for all out performance just a little more torque and a fresh motor to enjoy. I'm an ex R1 rider if I want big HP i'll get another R1. I first rode a 916 about 6 years ago after doing a bike swap with a friend for a 66km long winding road in the south of Western Australia once arriving in a town called Collie I got off the 916 with a smile from ear to ear and vowed to own a Ducati one day. That day has come at last.

Thanks for all the info.

Ryan
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post #7 of 27 (permalink) Old May 27th, 2008, 8:32 am
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I believe the left side of the 95 crank is different from your 99. You will have issues in the charging department.
Everyone else's here their idea of the 853cc motor is a good one, I've built two of them and they ran great, I think faster than a 916.

FYI...you cannot "just bore" the ducati cylinders, they are metal sprayed, and do not accept the standard boring. While this is possible you will need the correct materials sprayed back on. Quite expensive.
If you have your heart set on rebuilding a Duc, then try a 996, as they have the most bang for the buck, or rebuild you 748 into a 853

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post #8 of 27 (permalink) Old May 27th, 2008, 4:41 pm
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Cylinders are, I believe, Nikasil coated so boring is not an easy option, not sure how cylinder heads transplant either.

I would think that the best bet is to buy a 916 or better still a 996 (or 998, but may bring many other issues?) engine, check/rebuild it as neccessary, get it fitted then sell your 748 engine to recoup some (most) of the cost, this way you have full use of your bike until transplant day - that's how I'd do it anyway.


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post #9 of 27 (permalink) Old May 27th, 2008, 5:00 pm
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I'm on the 748/853 kit. The shorter stroke of the 748 is pretty nice to have. Also doing a motor swap would remove your gear box ratios, which are also very nice.

My advice is simple; If you want more bite, do the following:

853 kit (pistons and sleeves) Duc Shop link
50mm full exhaust
PC3 and fully dyno tune.

With that upgrade, you should be putting out more power then a 916 and have all the perks/benefits of a 748 at the same time!



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post #10 of 27 (permalink) Old May 27th, 2008, 5:16 pm
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Quote:
Originally Posted by tye1138 View Post
Also doing a motor swap would remove your gear box ratios, which are also very nice.
How's that? 748 gearbox will bolt up to a 996 motor( the initial gearbox used in the early 748 was that out of the 996sps); lots of people use that as a way to get a tighter set of gears on the big boy engines.

To the OP, get the 853 kit, it is a more economical way to go (IMHO) given that you know the build, parts and labor; as you pointed out, unless you buy a motor firsthand, and are able to test compression and leakdown on the spot, you may be buying into an expensive headache.

Not only that, but the 853 buildup has been done and chronicled extensively which means that you'll have a wealth of information to draw from in order to optimize your setup/rebuild.

Best of luck.

Last edited by hubert; May 27th, 2008 at 5:23 pm.
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