Flow bench data for the head is interesting in that the intake flow is considerably greater than a 92 bore Summerfield Manx Norton, and the engine being compared makes just better than 60 rwhp on gasoline.
The methanol will need a dash of Nitro to get up to that level!
Well, we anticipated that flow would be higher than the various Manx bikes out there, because we did some digging to try to find out some of that info, although it was very guarded info and hard to find. We also found the published cam grinds available for the Manx and G50, and they seemed to all have less lift at the valve than what we have on this head with the cams being used and our roller rocker ratio.
So, we have what appears to be greater flow, and higher lift than the best of the competition. What we don't have is the shorter stroke. In order to make the most out of the available flow, we need to have a lot of revs, like they have. And so this is the challenge with the long stroke. Things have been done in the BW racer to try to reach into the mid-8000's rpms, and it might be able to get up there with the necessary sorting out over time this year. If not, we may make some changes along the way to improve it. It's a new ball game with these heads, and we will probably need some time and work to get it all dialed in to the best of its capacity.
I don't think we'll need any nitro, but we will need the revs to get into the 8000's rpms. The flow in this head will allow 60hp at the rear wheel on gasoline, if the revs get where we want them.