'99 620SSie : 951cc engine - Ducati.ms - The Ultimate Ducati Forum
 
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post #1 of 10 (permalink) Old Apr 14th, 2019, 3:37 pm Thread Starter
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'99 620SSie : 951cc engine

Hi everybody,

for a few years I ride in competition (little endurance, 300 Miles, 4h30) with a 620 equipped with a stock 900ie

I am assembling a new engine:
- 748R crankcase
- 1000DS frank
- 900 conrods
- 900 cylinders with JE Pistons
- 900 cylinders head with head porting
- 748 gearbox
- 999RS fmywheel

I made some modifications on the case for the rear piston jet cooling and NJ207-ECP-C3 crank bearing

For the race (500 Miles, 6h30 this year) I intend to assemble the engine with a volumetric ratio of 11.5 : 1 to use SP98 gasoline

With pistons I currently have 13.4: 1 with DH 1mm

And here I have a dilemma, either I only change the pistons, or I put DH 1.4mm + modification of the pistons.


What do you think with the Ducati connecting rods?
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'93 750SS
'99 900SSie track Bike

Last edited by SamC; Yesterday at 12:48 am.
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post #2 of 10 (permalink) Old Apr 14th, 2019, 5:00 pm
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i wouldn't increase the deck height - that'll make it more likely to detonate.

modify the piston or put a flat top piston in it. oem 900ie pistons are lighter than the carby ones.

know all wanker
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post #3 of 10 (permalink) Old Yesterday, 12:57 am Thread Starter
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That's what I think too but for an endurance race I hesitated

The old engine is a 900ie ;-)

By the way I think I'll have a good time to adjust the injection correctly with the new displacement

'93 750SS
'99 900SSie track Bike
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post #4 of 10 (permalink) Old Yesterday, 2:56 am
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post #5 of 10 (permalink) Old Yesterday, 6:29 am
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if it has 620 throttle bodies still you could drop 1000 tables and breaks into the 620 file. or fit 800/1000 throttle bodies, set the throttle opening for the correct closed setting and use a 1000 file as a guesstimate.

how does the swingarm pivot work with the 748r cases?

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post #6 of 10 (permalink) Old Yesterday, 7:18 am Thread Starter
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Quote:
Originally Posted by belter View Post
if it has 620 throttle bodies still you could drop 1000 tables and breaks into the 620 file. or fit 800/1000 throttle bodies, set the throttle opening for the correct closed setting and use a 1000 file as a guesstimate.
I have 900SSie Throttle bodies
Unfortunatly my bike is a 1998/1999 SSie with 15M-A0, not the A8
I can not directly put a MAP of 1000 (if I'm not mistaken) in my 900SSie ECU

Quote:
how does the swingarm pivot work with the 748r cases?
I was waiting for the this question

When I bought the bike the engine was already on SBK cases, but the assembly was poorly done, the axis turned directly into the aluminum cases.....
The rigging was done with badly cut tube

I installed bronze rings in the crankcase (see pictures), stainless steel spacers to make the lateral setting and external plates
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post #7 of 10 (permalink) Old Yesterday, 8:15 am
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a lot less map points to change then. shouldn't be too hard.

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post #8 of 10 (permalink) Old Yesterday, 9:20 am Thread Starter
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You're right, I have a 1000MTS DP map, I just have to find the XDF to read the injection values and replace them in the MAP of my 900ie !

It will make me a good starting point to adjust

'93 750SS
'99 900SSie track Bike
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post #9 of 10 (permalink) Old Yesterday, 3:53 pm
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the values in the 5am fuel table are 16 bit, the 900ssie are 8 bit. try dividing the 5am numbers by 59 and using that in the 900ssie file.

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post #10 of 10 (permalink) Old Today, 5:26 pm
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Quote:
Originally Posted by SamC View Post
You're right, I have a 1000MTS DP map, I just have to find the XDF to read the injection values and replace them in the MAP of my 900ie !

It will make me a good starting point to adjust
Attached XDF for the A0 variant - just remove the .pdf
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File Type: pdf 15M_428_00_GuzziDiag_V2.28.xdf.pdf (48.2 KB, 4 views)

Richard Collins - 2001 900SSie I have a 2 strike policy - 2 no responses from a poster = no more responses from me to any post by them. I have a good memory!

Last edited by Punch; Today at 5:28 pm. Reason: Tyo
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