With the faulty LPG system to be replaced on MB3 (6301), I was looking at changing the throttle body & air filter assembly at the same time. Seems to me (& a few others) that the 6.9 throttle is too small. Rather than fit one much larger plate (75-100mm), I was wondering if it'd be better to fit two smaller plates half the size (or bigger)? I'm thinking any small movement of a large plate would translate to a large change in airflow, hence the idle speed may be inconsistent. However I've also heard that a one large, single opening is better than two half the size as two will have more exposed surfaces to create drag. I believe this theory also applies to exhausts, where one pipe is better than two half the size. Can anyone offer an expert opinion on airflow?
As well as the above issue, the current LPG system uses an exposed air cleaner which is hardly ideal (hot air), plus the element is quite a bit smaller than standard. There's no room to fit the standard airfilter assembly due to the current LPG mixer. I was looking at using 2 panel filters instead, but when I calculated the surface area, it's a bit less than standard. Question is was the standard filter too large considering the size of the throttle plate? Would it matter if the filtered volume is 2320m 3 vs 3600m 3 (nearly half)? Or is my theory & calculations way off the mark (pardon the pun)??
As well as the above issue, the current LPG system uses an exposed air cleaner which is hardly ideal (hot air), plus the element is quite a bit smaller than standard. There's no room to fit the standard airfilter assembly due to the current LPG mixer. I was looking at using 2 panel filters instead, but when I calculated the surface area, it's a bit less than standard. Question is was the standard filter too large considering the size of the throttle plate? Would it matter if the filtered volume is 2320m 3 vs 3600m 3 (nearly half)? Or is my theory & calculations way off the mark (pardon the pun)??
