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General Chat (Vincent Related)
Greg Brillus Racer
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<blockquote data-quote="greg brillus" data-source="post: 54742" data-attributes="member: 597"><p>Hi there all, just an update to let you know that the racer is progressing very well now. The engine is completely finished, and although I had a couple of issues to sort out, it all came together nicely. One item that had me for a while was one of the rocker tunnels was out of alignment.....that is that the fork in the rocker was not central to the valve stem. I ended up shimming the rocker over to one side slightly, to correct it. I am not sure why this happened, only that perhaps the tunnel was out beforehand. I had to make up special length pushrods at around 143 mm length to compensate for the change in rocker geometry. The change in height of the step on the valves seemed to be only necessary on the inlets....the exhausts needed to be closer to standard. The seats were changed to 45 degrees on account of what was easier for both the valves and the seats, and I had to remove a small amount of material in the roof of the rocker tunnels right in near the upper guides to allow the rocker assemblies to be installed. We ended up using valve spring retainers and collets from a Toyota engine, and machined the outside diameter to suit the Gold Star springs. I had to remove about 1.5 mm from the inside roof of the valve caps just to be sure of no clearance problems. The tappet adjusters are the allen key type, so no fear of them hitting inside the caps. One other issue I had which I was very keen to check, was the exact timing of the magneto. With number one set at 34 degrees, when I checked number 2 it showed 31 degrees......Hmmmmm. Out came the dremel with a sanding barrel attached.....Within two goes taking about 2 minutes in total, I ground the cam face for number 1 to equal the timing so both are now exactly 34 degrees.....I knew I should have been a cam grinder.!!! Anyway I was most happy with that, and yes I did polish the cam with some wet and dry, and I blew out the fine dust, and regreased the cam.....Jobs done. I will now spend the week reassembling the rest of the bike together, hoping for an engine run next weekend. I have decided to leave the exhaust as is for now, and will make changes a little later. I have been taking more photos, so I will organize some for David to post on here very soon. I'm getting quite excited now, Cheers......Greg.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 54742, member: 597"] Hi there all, just an update to let you know that the racer is progressing very well now. The engine is completely finished, and although I had a couple of issues to sort out, it all came together nicely. One item that had me for a while was one of the rocker tunnels was out of alignment.....that is that the fork in the rocker was not central to the valve stem. I ended up shimming the rocker over to one side slightly, to correct it. I am not sure why this happened, only that perhaps the tunnel was out beforehand. I had to make up special length pushrods at around 143 mm length to compensate for the change in rocker geometry. The change in height of the step on the valves seemed to be only necessary on the inlets....the exhausts needed to be closer to standard. The seats were changed to 45 degrees on account of what was easier for both the valves and the seats, and I had to remove a small amount of material in the roof of the rocker tunnels right in near the upper guides to allow the rocker assemblies to be installed. We ended up using valve spring retainers and collets from a Toyota engine, and machined the outside diameter to suit the Gold Star springs. I had to remove about 1.5 mm from the inside roof of the valve caps just to be sure of no clearance problems. The tappet adjusters are the allen key type, so no fear of them hitting inside the caps. One other issue I had which I was very keen to check, was the exact timing of the magneto. With number one set at 34 degrees, when I checked number 2 it showed 31 degrees......Hmmmmm. Out came the dremel with a sanding barrel attached.....Within two goes taking about 2 minutes in total, I ground the cam face for number 1 to equal the timing so both are now exactly 34 degrees.....I knew I should have been a cam grinder.!!! Anyway I was most happy with that, and yes I did polish the cam with some wet and dry, and I blew out the fine dust, and regreased the cam.....Jobs done. I will now spend the week reassembling the rest of the bike together, hoping for an engine run next weekend. I have decided to leave the exhaust as is for now, and will make changes a little later. I have been taking more photos, so I will organize some for David to post on here very soon. I'm getting quite excited now, Cheers......Greg. [/QUOTE]
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Greg Brillus Racer
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