Re: Series 2 survivor
Posted: Sun Oct 23, 2022 1:34 pm
Having been persuaded (willingly) not to stick to standard, I haven't exactly gone extreme, but it's a long way from factory spec.
Indian gp200 gearbox went in easy with a standard shim. Just how I prefer at the tight end of the range. I've got a 5 plate, 47 tooth clutch lying about that will work well with it.
A year or 2 ago, I bought a 62/110 crank from Darrell Taylor.
It has no shims but the webs aren't machined either. This is to maintain grip on the pin.
You can see that the rod is machined to clear the cases.
It comes with a jig to hold the crank central while you check for web to case clearance; mine was at least 0.7mm and DT recommended 0.4mm to me, so I'm perfectly happy with that.
Then I dry-fitted an RT195 kit to see what I needed to do to the ports. I was under the impression that a long stroke would reduce port timings, but it seems to have done just the opposite.
So I'm not sure which way to go with these timings. I'm happy with the transfers with all packers. But, raising the barrel takes the exhaust a little higher than I'd hoped but lowering takes the inlet a little higher than I'd hoped.
I'm erring toward the 3mm packer (175ex, 127tr, 145 inlet) as these are similar, but a bit more conservative, than a 175 cast tune I did a few years ago; I was happy with that.
So what would be a more torquey motor; 170exhaust, 150inlet or 175exhaust, 145inlet?
Indian gp200 gearbox went in easy with a standard shim. Just how I prefer at the tight end of the range. I've got a 5 plate, 47 tooth clutch lying about that will work well with it.
A year or 2 ago, I bought a 62/110 crank from Darrell Taylor.
It has no shims but the webs aren't machined either. This is to maintain grip on the pin.
You can see that the rod is machined to clear the cases.
It comes with a jig to hold the crank central while you check for web to case clearance; mine was at least 0.7mm and DT recommended 0.4mm to me, so I'm perfectly happy with that.
Then I dry-fitted an RT195 kit to see what I needed to do to the ports. I was under the impression that a long stroke would reduce port timings, but it seems to have done just the opposite.
So I'm not sure which way to go with these timings. I'm happy with the transfers with all packers. But, raising the barrel takes the exhaust a little higher than I'd hoped but lowering takes the inlet a little higher than I'd hoped.
I'm erring toward the 3mm packer (175ex, 127tr, 145 inlet) as these are similar, but a bit more conservative, than a 175 cast tune I did a few years ago; I was happy with that.
So what would be a more torquey motor; 170exhaust, 150inlet or 175exhaust, 145inlet?