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Re: RB inlet manifold
Posted: Sat Feb 21, 2009 7:01 pm
by leigh
Knowledge wrote:This is what Madmaex was talking about from the german forum on the previous page.
Nice. I respond better to pictures......
Some of the design issues with the RB manifold are to do with AF trying to avoid a patent issue with Tassinari's V-Force reed valve, making the monifold a bit of a compromise. If you look at the Worb RB engine from a recent issue of scootering (it made really silly horse power, but looked all-but unrideable from the dyno graph) they took out the AF reed and inserted a traditional V-force item. As the engine made 40+bhp, there is no doubt that the Tassinari flowed as much (if not more) than the AF Reed.
I can see that Worb's choice might be driven by a desire to maintain the velocity of the incoming charge. I believe that the standard RB inlet manifold does little to assist this. I also think that AF may have noticed this, and realised that opening-out the manifold to the full length of their own reeds would hamper this further.
Nice looking bit of kit but is this designed to work left side of engine as those stud holes dont appear to be correct.
Leigh
Re: RB inlet manifold
Posted: Sat Feb 21, 2009 9:20 pm
by rossi46
leigh wrote:Knowledge wrote:This is what Madmaex was talking about from the german forum on the previous page.
Nice. I respond better to pictures......
Some of the design issues with the RB manifold are to do with AF trying to avoid a patent issue with Tassinari's V-Force reed valve, making the monifold a bit of a compromise. If you look at the Worb RB engine from a recent issue of scootering (it made really silly horse power, but looked all-but unrideable from the dyno graph) they took out the AF reed and inserted a traditional V-force item. As the engine made 40+bhp, there is no doubt that the Tassinari flowed as much (if not more) than the AF Reed.
I can see that Worb's choice might be driven by a desire to maintain the velocity of the incoming charge. I believe that the standard RB inlet manifold does little to assist this. I also think that AF may have noticed this, and realised that opening-out the manifold to the full length of their own reeds would hamper this further.
Nice looking bit of kit but is this designed to work left side of engine as those stud holes dont appear to be correct.
Leigh
Well spotted Leigh, good point !!
Re: RB inlet manifold
Posted: Sat Feb 21, 2009 9:38 pm
by soulsurfer
madmaex08 wrote:pictures are of a rough prototype with wrong connecting holes...
Re: RB inlet manifold
Posted: Sun Feb 22, 2009 5:47 am
by martints1
...its the prototype - in the GSF I wrote, that at this one, there is a incorrect groundplate - the misstake is already
cleared - the manifolds are now in production - the will come for 30mm, 35mm and 38mm carbs. cheers Martin
Re: RB inlet manifold
Posted: Sun Feb 22, 2009 5:53 am
by martints1
...the problem with the VForce on the RB is, that you hace to use a spacer under the reed and then you have to
use excenter-cones or grind the frame under the inlet-manifold...I think the original-reeds from AF are very good...
with the longer stuffer of my manifold in combination with the AF-reeds you get a correct flow without failures (screws, sharp edges,...)
I will post fotos for the CNC-manifold wich is now in production with this features over the first prototype...
cheers Martin
Knowledge wrote:This is what Madmaex was talking about from the german forum on the previous page.
Nice. I respond better to pictures......
Some of the design issues with the RB manifold are to do with AF trying to avoid a patent issue with Tassinari's V-Force reed valve, making the monifold a bit of a compromise. If you look at the Worb RB engine from a recent issue of scootering (it made really silly horse power, but looked all-but unrideable from the dyno graph) they took out the AF reed and inserted a traditional V-force item. As the engine made 40+bhp, there is no doubt that the Tassinari flowed as much (if not more) than the AF Reed.
I can see that Worb's choice might be driven by a desire to maintain the velocity of the incoming charge. I believe that the standard RB inlet manifold does little to assist this. I also think that AF may have noticed this, and realised that opening-out the manifold to the full length of their own reeds would hamper this further.
Re: RB inlet manifold
Posted: Sun Feb 22, 2009 6:48 pm
by leigh
soulsurfer wrote:madmaex08 wrote:pictures are of a rough prototype with wrong connecting holes...
must read post slower
and digest.
Leigh