252wheelieking Posted September 20, 2011 Report Share Posted September 20, 2011 (edited) I currently have some stock stroke cylinders ported to match T-5's. I brought a set of SB IF Shearers in the mid summer. I did alot of reading in the search box & found that I have to get my cylinders port matched to the Shearers or I could be losing power. I didnt use a caliper to get my measurements, so they could be off by a mm. I used a ruler & got 28/29 mm from top of exhaust to TDC. I got 42/43mm from top of transfers to TDC. I did call the guy that ported my cylinders & told him I had shearers now. He told me that he could port them to match the shearers. (No problem) From what I have read about porting there are alot of variables that can dictate what a porter/builder names his porting based on different durations. I want my shee to be a mid-top (dune port). I just started learning about porting & found that it takes alot of reading & practice. So all help is appreciated. From my measurements what kind of porting do I currently have? All opinions accepted How much will I have to raise my exhaust to get the exhaust durations the Shearers like? Edited September 20, 2011 by 252wheelieking Quote Link to comment Share on other sites More sharing options...
252wheelieking Posted September 20, 2011 Author Report Share Posted September 20, 2011 Where is the help here? Quote Link to comment Share on other sites More sharing options...
Larry's Shee Posted September 21, 2011 Report Share Posted September 21, 2011 If nothing else contact Shearer and ask them what timing works best with their pipe. Throw a degree wheel on it and find out where you need to be. Quote Link to comment Share on other sites More sharing options...
252wheelieking Posted September 21, 2011 Author Report Share Posted September 21, 2011 From the measurements in previous post can you help me out with what my durations are? Quote Link to comment Share on other sites More sharing options...
lms1977 Posted September 21, 2011 Report Share Posted September 21, 2011 I would ask Matt shearer I think they will have to go up a pretty good amount. I think a 188 deg ex is around 1.087 or 27.6 mm and transfer 128 deg 1.615 or 41mm I might be way off so dont go by my numbers. Quote Link to comment Share on other sites More sharing options...
252wheelieking Posted September 21, 2011 Author Report Share Posted September 21, 2011 (edited) Thanks thats' ok. A ball park estimate is better than no info at all. I think I messed up selling my T5's & getting Shearers. My bike ran good with the T5's, I sold them to get Shearers thinking that bolting on Shearers would make more mid-top power. Come to find out I have to get my cylinders port matched to the Shearers, just to make the mid-top power I was looking for. what port name would you consider 128 transfer & 188 exhaust? trail, mx or dune Edited September 21, 2011 by 252wheelieking Quote Link to comment Share on other sites More sharing options...
Coupelx Posted September 21, 2011 Report Share Posted September 21, 2011 why not put them on and try them out? Quote Link to comment Share on other sites More sharing options...
252wheelieking Posted September 21, 2011 Author Report Share Posted September 21, 2011 (edited) I did & the shearers wasnt what I was expecting. Maybe if the porting was matched I'd like them better. That was the case with my shee when it was stock with the T5's before the porting to match the T5's. IDK Edited September 21, 2011 by 252wheelieking Quote Link to comment Share on other sites More sharing options...
lms1977 Posted September 21, 2011 Report Share Posted September 21, 2011 That's kinda aggressive trail / dune port My buddy might trade ya for the shearer he has t5's Seriously call matt he will let you know for sure but I'm sure you will only have top end with that pipe on a pretty stock motor. I thought you were doing a 4mil serval those pipes will work great on that!!!! Quote Link to comment Share on other sites More sharing options...
barahonapr Posted September 21, 2011 Report Share Posted September 21, 2011 Well if your looking to sell please let me know..haha Quote Link to comment Share on other sites More sharing options...
J-Madd Posted September 21, 2011 Report Share Posted September 21, 2011 You might be able to run a thicker base gasket and get the durations up a bit. You may have to shave the head to keep the compression and squish right. Just a thought. Porting would be best, though. Quote Link to comment Share on other sites More sharing options...
252wheelieking Posted September 21, 2011 Author Report Share Posted September 21, 2011 That's kinda aggressive trail / dune port My buddy might trade ya for the shearer he has t5's I was thinking about that at one point. Seriously call matt he will let you know for sure but I'm sure you will only have top end with that pipe on a pretty stock motor. I thought you were doing a 4mil serval those pipes will work great on that!!!! I'm going to get a 421 serval soon as the funds add up Well if your looking to sell please let me know..haha I keep that thought in mind. You might be able to run a thicker base gasket and get the durations up a bit. You may have to shave the head to keep the compression and squish right. Just a thought. Porting would be best, though. I'm going to get my cylinders port matched & see how I like that. It should run alot better. In my very first post I just wanted to know what my port durations was for the T5's & how much more would I have to raise the exhaust ports to get a duration that the Shearers like. I know I'm going to get different opinions, but that's what im looking for. Quote Link to comment Share on other sites More sharing options...
J-Madd Posted September 21, 2011 Report Share Posted September 21, 2011 194* - 198* exhaust works well with Shearers. I know because I have (Cub) motors that are in this range. NOt to say that they don't work well at less than that, just that I don't have experience running those #s with them. Someone else will for sure, or you can always call Matt Shearer. I also have a Cub motor at 200* and it likes CPIs. Just my experience. Quote Link to comment Share on other sites More sharing options...
252wheelieking Posted September 22, 2011 Author Report Share Posted September 22, 2011 194* - 198* exhaust works well with Shearers. I know because I have (Cub) motors that are in this range. NOt to say that they don't work well at less than that, just that I don't have experience running those #s with them. Someone else will for sure, or you can always call Matt Shearer. I also have a Cub motor at 200* and it likes CPIs. Just my experience. Thanks for the knowledge. I want a good mid-top end port but not a full drag port. More of a agressive dune port. So will 128* transfer & 196* exhaust be good #'s for a agressive dune port? Thanks again as the info you are sharing with me helps alot. Quote Link to comment Share on other sites More sharing options...
lms1977 Posted September 22, 2011 Report Share Posted September 22, 2011 That's all top end I think you won't want to trail that at all Quote Link to comment Share on other sites More sharing options...
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