Some 2T questions.

[Zynerji]

So, just coming up to speed on the 2T tech as F1 talks of moving into that direction, but a few things are unclear to me after reading up.

1. Is it necessary to feed the air through the crankcase, or could it be sent from outside? Does a VLIM make sense for 2T?

2. I see lots of roller bearing cranks in the snowmobile world. It's that a 2T thing? Why?

3. If the expansion exhaust is used for scavenging, is this required for a turbo setup? Possible VLEM with movable folded horn?

I have a few more, but would like to hear about these first.

Thanks!

[Tommy Cookers]

1. Is it necessary to feed the air through the crankcase, or could it be sent from outside? Does a VLIM make sense for 2T?
2. I see lots of roller bearing cranks in the snowmobile world. It's that a 2T thing? Why?
3. If the expansion exhaust is used for scavenging, is this required for a turbo setup? Possible VLEM with movable folded horn?

normally/traditionally
1 NA must use crankcase induction - Boosted avoids using crankcase
2 roller bearings used to minimise oil need as oil is in petroil or is pumped oil ending after 1 pass in total loss
3 tuned length exhaust action is not necessary/desirable

btw a few million 2T European-normal-sized road cars were sold c 1930s - 1970s (almost all DKW derived)

[Big Tea]

1. Is it necessary to feed the air through the crankcase, or could it be sent from outside? Does a VLIM make sense for 2T?
2. I see lots of roller bearing cranks in the snowmobile world. It's that a 2T thing? Why?
3. If the expansion exhaust is used for scavenging, is this required for a turbo setup? Possible VLEM with movable folded horn?

normally/traditionally
1 NA must use crankcase induction - Boosted avoids using crankcase
2 roller bearings used to minimise oil need as oil is in petroil or is pumped oil ending after 1 pass in total loss
3 tuned length exhaust action is not necessary/desirable

btw a few million 2T European-normal-sized road cars were sold c 1930s - 1970s (almost all DKW derived)

A friend had a Wartberg (is it Knight????) 3 cyl 2t it sounded brill and did not go too bad after a bit of modding.
I seem to remember it being red hot after a run and steaming like a train


Edit, just googled it, which I should have don in the first place, apparently it was Wartburg 353 in E Germany