I have no idea, but I'd guess adding fins must make some useful difference else it would not be worth the casting costs.

alistair

On 2011-07-20, at 11:29 PM, Scott Daniel - Turbovans wrote:

> sorry..
> I didn't make it clear that is just a wild guestimate.
> 
> what is your hunch on it ?
> 
> 
> ----- Original Message ----- From: "Alistair Bell" <albell@SHAW.CA>
> To: <vanagon@GERRY.VANAGON.COM>
> Sent: Wednesday, July 20, 2011 3:58 PM
> Subject: Re: Watching Oil Temp (long, as usual)
> 
> 
> how the heck did you come up with that value?
> 
> is this based on any measurement?
> 
> what is the increased surface area provided by the fins? if you know that then you can start using numbers, otherwise its all hooey Scott.
> 
> alistair
> 
> 
> On 2011-07-20, at 3:04 PM, Scott Daniel - Turbovans wrote:
> 
>> Like if there were no ribs..
>> just smooth aluminum ...about a 1 and 1/2 percent difference..
>> on other words, not much. 
>