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Author Topic: engine 826  (Read 11892 times)
pepeducat
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« on: June 02, 2015, 11:48:19 PM »
I have plans to mount a Café Racer with a 826 engine ... But what is it 826, Ducati has never produced Huh?

In fact I'll put a crankshaft 900 in a 750 to reach 826

So I have this, a low engine 750





a 750 Paso gearbox with its clutch





900SS the crankshaft 91 while polite



a pair of cam shaft NCR7



a flywheel 600SS, 440gr against original 1880gr Evil



A pair of cylinder heads Paso
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koko64
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« Reply #1 on: June 02, 2015, 11:55:51 PM »
Cool. waytogo
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« Reply #2 on: June 03, 2015, 03:04:01 AM »
I'm really curious to see how this is going to pan out. The way I understood it, there is some serious compatibility issues with the "small block" motors and the 900's. I'm curious to see how it would go the other way. 750 crank in 900 case with 94mm pistons. I got 853 cc but way oversquare. Like 1.5 bore to stroke ratio.


Keep us posted pepe, this is gonna get good.  bacon bacon
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« Reply #3 on: June 03, 2015, 03:36:10 AM »
Stroker Ducati eh?
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« Reply #4 on: June 03, 2015, 03:45:52 AM »
Quote from: MotoPsycho on June 03, 2015, 03:04:01 AM
I'm really curious to see how this is going to pan out. The way I understood it, there is some serious compatibility issues with the "small block" motors and the 900's. I'm curious to see how it would go the other way. 750 crank in 900 case with 94mm pistons. I got 853 cc but way oversquare. Like 1.5 bore to stroke ratio.


Keep us posted pepe, this is gonna get good.  bacon bacon
Eric at clubhousemotorsports has an 853 motor just like that. It sounds more like a 748 than a 900 with the short stroke.

Goes pretty good too.
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« Reply #5 on: June 03, 2015, 09:17:48 AM »
*bookmarked..

I have 3 paso 750 engines laying around in my garage...
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« Reply #6 on: June 03, 2015, 09:24:17 AM »
Send me a PM if you're interested in some modified F1 heads for that thing...
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« Reply #7 on: June 03, 2015, 01:56:15 PM »
Quote from: MotoPsycho on June 03, 2015, 03:04:01 AM
I'm really curious to see how this is going to pan out. The way I understood it, there is some serious compatibility issues with the "small block" motors and the 900's. I'm curious to see how it would go the other way. 750 crank in 900 case with 94mm pistons. I got 853 cc but way oversquare. Like 1.5 bore to stroke ratio.


Keep us posted pepe, this is gonna get good.  bacon bacon

In fact I do the closet background in the various workshops that I know

826 And then, I've never seen or heard that someone tried

But I have a lot of work on the crankshaft and alternator housing
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ducatiz
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« Reply #8 on: June 03, 2015, 04:49:59 PM »
Quote from: pepeducat on June 03, 2015, 01:56:15 PM
In fact I do the closet background in the various workshops that I know

826 And then, I've never seen or heard that someone tried

But I have a lot of work on the crankshaft and alternator housing

http://www.ducatitech.com/info/bore.html

Bore = 92
stroke = 61.5  (paso 750, pre 93 elefant 750, indiana)
= 817.8 cc

Bore = 92
Stroke = 64  (851,888)
= 853cc

Bore = 94
Stroke = 61.5 = 853cc

904cc 900 engine is 92mm stroke
« Last Edit: June 03, 2015, 06:43:52 PM by ducatiz » Logged
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"Yelling out of cars, turning your speakers out the window to blast your music onto the street, setting off M-80 firecrackers, firing automatic weapons into the air—these are all well and good. But none of them create a merry atmosphere of insouciance and bonhomie quite like a revving motorcycle.
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« Reply #9 on: June 03, 2015, 06:20:07 PM »
According to the calculator 68 stroke (900) & 88 bore (750) =827

The early Elefant Dakar bikes went from 750 up to 853 before they went to 904? That right Tiz?
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ducatiz
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« Reply #10 on: June 03, 2015, 06:49:34 PM »
Quote from: koko64 on June 03, 2015, 06:20:07 PM
According to the calculator 68 stroke (900) & 88 bore (750) =827

The early Elefant Dakar bikes went from 750 up to 853 before they went to 904? That right Tiz?

Yeah, the old style Elefants used the Pantah RHS clutch cases.  First one was the plain old 750 paso style, then in 86 they bumped it to 853..  in 88, they moved to the 906 style case with 5spd and 904 and in 90 they used the 907 case with 944cc

i was thinking the opposite, paso crank with 900 pistons..durr.. 

bore = 88 (750 pistons)
stroke = 68 (904 engine)
= 827.3 cc


now i'm happy
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"Yelling out of cars, turning your speakers out the window to blast your music onto the street, setting off M-80 firecrackers, firing automatic weapons into the air—these are all well and good. But none of them create a merry atmosphere of insouciance and bonhomie quite like a revving motorcycle.
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« Reply #11 on: June 03, 2015, 07:00:10 PM »
Sooo ive always heard the cases are different for the smaller motors. Just bearings?
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« Reply #12 on: June 03, 2015, 07:11:57 PM »
Pepe, how you managing piston height/clearance to the combustion chamber roof and valves? Is there an issue with the longer stroke and short cylinders?
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« Reply #13 on: June 03, 2015, 07:33:04 PM »
Quote from: koko64 on June 03, 2015, 07:11:57 PM
Pepe, how you managing piston height/clearance to the combustion chamber roof and valves? Is there an issue with the longer stroke and short cylinders?

They've got plenty of metal to relieve but I don't see the additional stroke requiring too much if he can machine that crank.  i would lighten and "knife" it like the SPS models just to get rid of a lot of metal before worrying about the pistons..
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"Yelling out of cars, turning your speakers out the window to blast your music onto the street, setting off M-80 firecrackers, firing automatic weapons into the air—these are all well and good. But none of them create a merry atmosphere of insouciance and bonhomie quite like a revving motorcycle.
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« Reply #14 on: June 03, 2015, 09:01:33 PM »
Quote from: koko64 on June 03, 2015, 07:11:57 PM
Pepe, how you managing piston height/clearance to the combustion chamber roof and valves? Is there an issue with the longer stroke and short cylinders?

I'll do a calculation to determine the height of a wedge that will replace the base gasket and have optimum squish.
It will be laser cut or water jet in an aluminum plate and I could bump my cylinder at the right height.
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