This is not an Berg , but some of you may like it 
1098 head / 1198 piston and liner / Ktm 690 engine
Here is the bike ready to go ;-)
https://www.youtube.com/watch?v=MBZoldlisEU
https://www.youtube.com/watch?v=v_-ws2sK3ZQ
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1098 head / 1198 piston and liner / Ktm 690 engine
Here is the bike ready to go ;-)
https://www.youtube.com/watch?v=MBZoldlisEU
https://www.youtube.com/watch?v=v_-ws2sK3ZQ
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Joined Sep 2007
782 Posts | 291+
???
Nice fdracing, thanks for that!
Hi Tom Tom, Can you inform me of the pin size of the 1198 piston, and the
compression height? if possible.
Not sure if the Ducati piston would have enough thickness in the crown to allow for a dish to be milled to reduce the compression or if they have a lower compression piston for the less HP version?
Hi Tom Tom, Can you inform me of the pin size of the 1198 piston, and the
compression height? if possible.
Not sure if the Ducati piston would have enough thickness in the crown to allow for a dish to be milled to reduce the compression or if they have a lower compression piston for the less HP version?
Pin size is 20mm (Witdh for the rod is 21.2mm)
Compression height is 25.4mm (measured on the bench, not from a blue print).
1198 piston has a 2.6mm dome, dont think it will be enough material as the material is domed inside the piston aswell.
1098R piston is the same but flat top(smaller combustion chamber).
The lowest comp ducati pistons are flat, so no dished available Im afraid.
the 1198 , 106 mm piston is 507 grs including rings and pin .
the crown is very thin , i personnaly took off 1mm to match my comp ratio
mesured on my piston the stock comp height is 25.9 mm , stock overall height is 45 mm , i reduced it to 35 mm.
the final piston weight is 450 grs , just what you need for an 80 mm stroke engine at 8500 revs/min ;-)
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the crown is very thin , i personnaly took off 1mm to match my comp ratio
mesured on my piston the stock comp height is 25.9 mm , stock overall height is 45 mm , i reduced it to 35 mm.
the final piston weight is 450 grs , just what you need for an 80 mm stroke engine at 8500 revs/min ;-)
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No real idea where to get a good piston other than custom order.
On the 106mm race bike I use pistal pistons that are a lot lighter but they have even thinner material.
I have some left over pistons from another 106mm engine in the garage, they are heavy compared to oem so perhaps they have more material in the crown, if so I can donate them, Ill check tomorrow when in the garage. I can drill one and see, not going to use them anyway.
On the 106mm race bike I use pistal pistons that are a lot lighter but they have even thinner material.
I have some left over pistons from another 106mm engine in the garage, they are heavy compared to oem so perhaps they have more material in the crown, if so I can donate them, Ill check tomorrow when in the garage. I can drill one and see, not going to use them anyway.
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Joined Sep 2007
782 Posts | 291+
???
Thanks very much guys for your help
Thanks Tom Tom, but don`t go drilling any pistons, you never know you might need them, and unless it had a dish of some sort would probably be of no use anyway. The Ducati Diaval piston looks to have a slight dish?
fdracing; I am going to be using a shorter stroke than 80mm, possibly around
the 70mm region all dependent on how the rest of the build up works out.
ie big bore short stroke + big valves, high RPM and around 670ccish
Just for something different to usual tractor like build
Custom order will probably be the answer. Pity Beryllium pistons never took off.
Thanks Tom Tom, but don`t go drilling any pistons,
you never know you might need them, and unless it had a dish of some sort would probably be of no use anyway. The Ducati Diaval piston looks to have a slight dish?fdracing; I am going to be using a shorter stroke than 80mm, possibly around
the 70mm region all dependent on how the rest of the build up works out.
ie big bore short stroke + big valves, high RPM and around 670ccish
Just for something different to usual tractor like build
Custom order will probably be the answer. Pity Beryllium pistons never took off.
Hmm, that doesnt sound right, what ducati gasket is that you are using?
1198 one is good at 70nm per cylinder, not prone to blow at all.
I am using the genuine 1198 gasket but it doesnt matter , as you said , the gasket is good at 70 nm of torque , my engine is giving +/- 100 nm, thats why it blows :-(
i have had these issues with my 100 hp Ktm 693 engines , and i solve the problem using metal ring gasket , so , I know what to do ;-)
i have had these issues with my 100 hp Ktm 693 engines , and i solve the problem using metal ring gasket , so , I know what to do ;-)
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I am using the genuine 1198 gasket but it doesnt matter , as you said , the gasket is good at 70 nm of torque , my engine is giving +/- 100 nm, thats why it blows :-(
i have had these issues with my 100 hp Ktm 693 engines , and i solve the problem using metal ring gasket , so , I know what to do ;-)
100nm and 100hp renders totally implausible VE from 693cc.
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Joined Nov 2012
2K Posts | 821+
Iceland
I took it as he was talking about two separate engines
Making 100nm with one and 100hp with the other heheheverything is possible down here !! lol , as far as you work pretty hard ...
this engine, the ktm/ducati , is 705 cc , and gives 100 nm at 6500 revs/min , it's a torquey one , but likes to revs to 8500 very easily on the track (tanks to the ducati head ) ;-)
the "old" ones , the ktm engines were 693 cc , less torquey , but enought to give 100 hp at 8500 revs/min on the dyno , on the track it was hard to get 8000 revs/min :-(
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this engine, the ktm/ducati , is 705 cc , and gives 100 nm at 6500 revs/min , it's a torquey one , but likes to revs to 8500 very easily on the track (tanks to the ducati head ) ;-)
the "old" ones , the ktm engines were 693 cc , less torquey , but enought to give 100 hp at 8500 revs/min on the dyno , on the track it was hard to get 8000 revs/min :-(
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Its just my spontaneous reaction and nothing personal , however I may have missed something important as I dont know the scope of the engine, is it naturally aspirated and what fuel is being used?
Id love to know the specs like bore, stroke static compression, and a dyno chart will be very helpful to understand what the engine does.
Cheers, Tom
, however I may have missed something important as I dont know the scope of the engine, is it naturally aspirated and what fuel is being used? Id love to know the specs like bore, stroke static compression, and a dyno chart will be very helpful to understand what the engine does.
Cheers, Tom
Thought you already had the numbers in? You were estimating??
Alright, prepare for how you acheived 141nm per litre if NA and Pump gas.
13;1 (cc:ed)and 599cc renders 68nm with good scavenging from 8k, per cylinder, and 183hp on the twin. Pump gas NA.
106x67.9 and 1198 head, 113nm per litre that renders, top number.
Tested already, not guessing.
You have a go
Alright, prepare for how you acheived 141nm per litre if NA and Pump gas.
13;1 (cc:ed)and 599cc renders 68nm with good scavenging from 8k, per cylinder, and 183hp on the twin. Pump gas NA.
106x67.9 and 1198 head, 113nm per litre that renders, top number.
Tested already, not guessing.
You have a go
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