I've been thinking using aluminium in front flywheel, but after all decided to go with RST. Here's some pics:
The flywheel itself (with starter gear) weights 1.6 kilos and complete assy with original center triangle is 2.7 kg. Could make it still a bit lighter, there is lot of safety margin left..
What about crankshaft? Do you see any negative aspects in sharpening counterweights? How much metal could been taken away without disturbing durability? Taking them completely away may not be good idea, though..
The flywheel itself (with starter gear) weights 1.6 kilos and complete assy with original center triangle is 2.7 kg. Could make it still a bit lighter, there is lot of safety margin left..
What about crankshaft? Do you see any negative aspects in sharpening counterweights? How much metal could been taken away without disturbing durability? Taking them completely away may not be good idea, though..
Kimmo / alfatune.fi
serios light flywheel is that i likie it ... what kind of steel is that?
SS or crome moly ? and what is overal thicknes of komplete wheel+cast triangle ... its must be the same as original cast wheel thicknes ... iam too curous about crank lightening ..there is alot of meat to remove, if i rememeber corect -1 kg of rotating mas(flywheel crank counterweights) is similar to -20 kg of dead weight in acceleration ...
SS or crome moly ? and what is overal thicknes of komplete wheel+cast triangle ... its must be the same as original cast wheel thicknes ... iam too curous about crank lightening ..there is alot of meat to remove, if i rememeber corect -1 kg of rotating mas(flywheel crank counterweights) is similar to -20 kg of dead weight in acceleration ...
Nice!
Looks like you made it out a sheet of steel? You can get a LOT more weight off if you could ditch the std cast iron centre.
The gain in rotational mass is HUGE! Very interesting.
Looks like you made it out a sheet of steel? You can get a LOT more weight off if you could ditch the std cast iron centre.
The gain in rotational mass is HUGE! Very interesting.
Mats Strandberg
-Scuderia Rosso- Now burned to the ground...
-onemanracing.com-
-Strandberg.photography-
GTV 2000 -77 - Died in the fire.
155 V6 Sport -96 - Sold!
-Scuderia Rosso- Now burned to the ground...
-onemanracing.com-
-Strandberg.photography-
GTV 2000 -77 - Died in the fire.
155 V6 Sport -96 - Sold!
Yes, it's made from stainless steel sheet. Not sure about the specific ASTM code. It was quite tough when turning in lathe, as SS's usually are.
Overall thickness is now 1.5mm more than in original flywheel, but that's near enough. Could compensate it by milling some material away, but guess won't bother..
The cast iron centre weights 1.1 kg. Could be lighter tough. Fortunately the mass is on small radius and won't do too much for inertia.
Overall thickness is now 1.5mm more than in original flywheel, but that's near enough. Could compensate it by milling some material away, but guess won't bother..
The cast iron centre weights 1.1 kg. Could be lighter tough. Fortunately the mass is on small radius and won't do too much for inertia.
Kimmo / alfatune.fi
If you think stainless is tough, try titanium.kterkkila wrote:Yes, it's made from stainless steel sheet. Not sure about the specific ASTM code. It was quite tough when turning in lathe, as SS's usually are.
Overall thickness is now 1.5mm more than in original flywheel, but that's near enough. Could compensate it by milling some material away, but guess won't bother..
The cast iron centre weights 1.1 kg. Could be lighter tough. Fortunately the mass is on small radius and won't do too much for inertia.
Are you going to fix the centre to the flywheel somehow? Might be a bit of a problem, balance wise, if you don't.
Mats Strandberg
-Scuderia Rosso- Now burned to the ground...
-onemanracing.com-
-Strandberg.photography-
GTV 2000 -77 - Died in the fire.
155 V6 Sport -96 - Sold!
-Scuderia Rosso- Now burned to the ground...
-onemanracing.com-
-Strandberg.photography-
GTV 2000 -77 - Died in the fire.
155 V6 Sport -96 - Sold!
- Maurizio
- Verde
- Posts: 680
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Nice done, I'm not that keen on the original cast iron.
You might consider doing the center also in ss.
And leave then material in the places you really need it the triangle between the thee bolts.
Saluti,
Maurizio
You might consider doing the center also in ss.
And leave then material in the places you really need it the triangle between the thee bolts.
Saluti,
Maurizio
Banned.. ? Daily donky.. ==> BMW 325d
E36M3 (3.0) Ringtool ==> definitely BANNED!
AR 75 TS Ringtool '90, AR Spider 2000 veloce '79
E36M3 (3.0) Ringtool ==> definitely BANNED!
AR 75 TS Ringtool '90, AR Spider 2000 veloce '79
I'm not going to fix parts together, but will mark them to keep them in same position after balancing.
I think I'm done with the front wheel for this time. May think SS center triangle later. Now must concentrate on other things, like rear flywheel. There's still some work to do
Should the crankshaft been knife edged like this Opel crank? Suggestions?
http://homepage.ntlworld.com/david.jack ... rt_eng.htm
I think I'm done with the front wheel for this time. May think SS center triangle later. Now must concentrate on other things, like rear flywheel. There's still some work to do
Should the crankshaft been knife edged like this Opel crank? Suggestions?
http://homepage.ntlworld.com/david.jack ... rt_eng.htm
Kimmo / alfatune.fi
Great example.. That Opel engine was ruined soon due to broken crankshaft
http://homepage.ntlworld.com/david.jack ... _build.htm
http://homepage.ntlworld.com/david.jack ... _build.htm
Kimmo / alfatune.fi
Jumping to conclusions are we?kterkkila wrote:Great example.. That Opel engine was ruined soon due to broken crankshaft
http://homepage.ntlworld.com/david.jack ... _build.htm
How do you know it wasn't from the fact that the block was bores alot and it cracked then snapped the crank?
Mats Strandberg
-Scuderia Rosso- Now burned to the ground...
-onemanracing.com-
-Strandberg.photography-
GTV 2000 -77 - Died in the fire.
155 V6 Sport -96 - Sold!
-Scuderia Rosso- Now burned to the ground...
-onemanracing.com-
-Strandberg.photography-
GTV 2000 -77 - Died in the fire.
155 V6 Sport -96 - Sold!
kterkkila
I like the way you're thinking and then having the balls to go out and just do it. Love it ! That's the good bit.
My conservative side suggests that you may develop your own broken crankshaft with such a light flywheel. The reason I say that is that "other" job of the flywheel is to absorb some of the vibrations and do some form of dampening itself . If there is not enough mass there, the crankshaft will have to do a lot more itself. The question is, can it take it?
I guess you'll just have to suck it and see .
I do agree with other comments that you may need to better integrate the two components and balance it as a unit before mounting onto the crank. I think it would be a safer and better option with better balancing outcomes.
Having said all that poobah, there is only one other thing to say, oh wow !
Keep us updated.
BTW. Opel, is that like a German Skoda ?
I like the way you're thinking and then having the balls to go out and just do it. Love it ! That's the good bit.
My conservative side suggests that you may develop your own broken crankshaft with such a light flywheel. The reason I say that is that "other" job of the flywheel is to absorb some of the vibrations and do some form of dampening itself . If there is not enough mass there, the crankshaft will have to do a lot more itself. The question is, can it take it?
I guess you'll just have to suck it and see .
I do agree with other comments that you may need to better integrate the two components and balance it as a unit before mounting onto the crank. I think it would be a safer and better option with better balancing outcomes.
Having said all that poobah, there is only one other thing to say, oh wow !
Keep us updated.
BTW. Opel, is that like a German Skoda ?
Transaxle Alfas Haul More Arse