buckin-wood
Well-Known OPE Member
- Local time
- 8:44 AM
- User ID
- 10835
- Joined
- Oct 29, 2019
- Messages
- 65
- Reaction score
- 96
- Location
- North East
Got a chinvarna 395 and had some problems with the farmetec top end. So I've moved onto a hyway 395 jug with popup piston and started making aluminum chips. As I'm "touching up" the hyway cylinder I realize I have no idea what I'm doing and looking for advise
I found a few posts by folks that have worked oem 395 cylinders and simply copied their recipe... 102/122/82. I'm finishing up the transfers, and have the intake and exhaust mostly done... I think. Hoping folks have some input on a couple questions I'm thinking about before going any further.
-should the sides of the exhaust port flare out/taper more as they approach the muffler flange? any magic ratio of inlet to outlet?
-on the intake side of the lower transfers I took out a large bulge. Now I'm wondering if that casting was intentional to either produce a specific flow pattern or to reduce volume/cross sectional area of the lower transfer
-on the uppers I'm working with the scarr contra handpiece. I've got some touchup to do, but hoping i'm going in the right direction....
I found a few posts by folks that have worked oem 395 cylinders and simply copied their recipe... 102/122/82. I'm finishing up the transfers, and have the intake and exhaust mostly done... I think. Hoping folks have some input on a couple questions I'm thinking about before going any further.
-should the sides of the exhaust port flare out/taper more as they approach the muffler flange? any magic ratio of inlet to outlet?
-on the intake side of the lower transfers I took out a large bulge. Now I'm wondering if that casting was intentional to either produce a specific flow pattern or to reduce volume/cross sectional area of the lower transfer
-on the uppers I'm working with the scarr contra handpiece. I've got some touchup to do, but hoping i'm going in the right direction....