I would like to know as well. But I don’t think you can increase top speed with such an upgrade. You can go a lot faster up hills and into the wind, but too speed will not change much until the transmission is reheated to take advantage of the additional torque. The two diesels are going to rev to pretty much the same RPM.   
  

  
Jim
  

  
  

  
  
>   
> On Jan 31, 2021 at 4:42 AM,  <thewestyman (mailto:zolo@foxinternet.net)>  wrote:
>   
>   
>   
>  Hello to the List,  
>
> I have a weak 1.6 engine now that I would like to change to a 110-150 HP 1.9 that can cruise 70-80 mph easily and won’t get afraid of hills.  
>
> My question is; which type of engine is the one that fits well without much trouble? I noticed, that there are different code letters. And what extra parts to obtain for the exchange?  
>
> I am in Europe now, but the knowledge is in the Vanagon List and I hope, there are members who know specifically the answer. That would be an great help.  
>
> Anyone can chip in?  
>
> With respect,  
> Zoltan  
>