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Post by iwiketuddlz on Dec 23, 2014 16:19:23 GMT -5
Sounds like a good plan OG. The 130 intake is what John suggested to be. I think you could go a little higher on the exhaust. With the iron cylinder you could open the exhaust port and get it to 192 or so. What pipe is it and what rpm range? Yeah, not really knowing what I am doing myself, I am using Johns #'s from early in this thread. You think it would be ok to take it to 192 with this pipe? The pipe is a Technigas that I have been unable to identify. I can tell you that it is massive compared to the Next-R I have, but other than that its a mystery to me. The stinger ID is identical to the one on the Next-R. . I have the same pipe OG
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Post by 2strokd on Dec 23, 2014 16:27:06 GMT -5
Is that a RSII 70 pipe maybe? Ide keep the ex duration where it is for now unless you are looking for the most peak power possible with the set-up? Even then too much ex duration with the wrong pipe and it wont help at all. Those pipe pictured are happy with 180-185 but you can always try with more... Wouldnt be the first
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Post by oldgeek on Dec 24, 2014 11:10:24 GMT -5
Is that a RSII 70 pipe maybe? Ide keep the ex duration where it is for now unless you are looking for the most peak power possible with the set-up? Even then too much ex duration with the wrong pipe and it wont help at all. Those pipe pictured are happy with 180-185 but you can always try with more... Wouldnt be the first I think someone did say the bottom one is a RSII. Current durations since the rebuild and mild trenching are transfer 130, exhaust 194, compression 119. I still have the RSII pipe on it, and it pulls pretty hard after 6k and tops out just after 10K. I plan to try a Malossi MHR racing pipe I just picked up when I get a chance. I hope it will wake it up just a bit. Compression is kinda low I think? I need a step cut head for it.
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Post by 90GTVert on Dec 25, 2014 5:47:13 GMT -5
I think you'd find more in it pushing the compression up another 30psi or so. With those durations you may be able to use a slightly thinner base spacer/gasket, but not enough to change compression a whole lot.
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Post by oldgeek on Dec 25, 2014 8:11:29 GMT -5
I think you'd find more in it pushing the compression up another 30psi or so. With those durations you may be able to use a slightly thinner base spacer/gasket, but not enough to change compression a whole lot. Yeah I need to get the compression higher somehow. It was 170 on the original build, before I started messing with cylinder base spacers and durations. I would rather not mess with the cylinder base spacing. I use copper spray without a head gasket to seal the head, so I guess my only options are milling the deck of the cylinder down a bit, or getting the head milled to fit down into the cylinder. Possibly a head with less volume would also work?
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Post by 190mech on Dec 25, 2014 10:26:02 GMT -5
Does your head have a recess around the outer edge?If so you could sand it down to lower the squish,just make sure the head squish angle is the same as the piston top..If you need a step cut,I could do it if you give me the amount to remove..
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Post by 2strokd on Dec 25, 2014 11:37:32 GMT -5
I love those stepcut heads John does! The self center like no other and never blow head gaskets and leak like the others with super high compression (230+). They wont walk near as much... John does a good job making that step fit juuuuuusst right in the barrel! Probably best to send the cylinder too for the best fit possible.? Stepcuts are the best IMO because you can always add a gasket are two and use the head on many apps
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Post by oldgeek on Dec 25, 2014 16:29:53 GMT -5
Does your head have a recess around the outer edge?If so you could sand it down to lower the squish,just make sure the head squish angle is the same as the piston top..If you need a step cut,I could do it if you give me the amount to remove.. The streetrace head has the recess you speak of. I figured compression would be low, so I used a 50cc head without a recess that I opened up just a bit on the drillpress, but compression is still only around 120. I think it was around 160 - 170 on the last build. It would be awesome if you could put a step cut on the streetrace head for me. PM me your address when you get a chance, and I will get it over to you.
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Post by 190mech on Dec 26, 2014 17:59:37 GMT -5
PM sent
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Post by oldgeek on Jan 3, 2015 0:21:12 GMT -5
I finally made some measurements of the Malossi MHR Race pipe. I am thinking about putting this on the 70cc Streetrace if I get the compression up a bit. This is easily the lightest weight pipe I have.
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Post by 190mech on Jan 3, 2015 5:11:24 GMT -5
Nice work!Just at a glance it looks like it'll work fine,If you can get the curved head pipe length thru its center line (piece of stiff wire works well),I can calculate the tuned length and cone %,Then we'll have a better idea how well it performs..
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Post by Lucass2T on Jan 3, 2015 7:10:58 GMT -5
OG do you have any id how thick the metal is?
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Post by 190mech on Jan 3, 2015 7:14:59 GMT -5
Most pipes are .8 mm (.032") wall thickness..
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Post by oldgeek on Jan 3, 2015 8:44:35 GMT -5
Nice work!Just at a glance it looks like it'll work fine,If you can get the curved head pipe length thru its center line (piece of stiff wire works well),I can calculate the tuned length and cone %,Then we'll have a better idea how well it performs.. Thanks for the hint on how to get that measurement. I worked on this last night and almost fell asleep doing it, I guess I forgot to measure that part. Lol! OG do you have any id how thick the metal is? I cant tell for sure. Specs for a similar MHR pipe are .8mm thick, and described as special sheet steel, whatever that is!
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Post by Lucass2T on Jan 3, 2015 8:54:34 GMT -5
Nice work!Just at a glance it looks like it'll work fine,If you can get the curved head pipe length thru its center line (piece of stiff wire works well),I can calculate the tuned length and cone %,Then we'll have a better idea how well it performs.. Thanks for the hint on how to get that measurement. I worked on this last night and almost fell asleep doing it, I guess I forgot to measure that part. Lol! OG do you have any id how thick the metal is? I cant tell for sure. Specs for a similar MHR pipe are .8mm thick, and described as special sheet steel, whatever that is! Yeah it'll probably be 0.8, as far as i know quite the standard thickness for a 2t pipe ...So we'll have to take 1.6mm from the specs you've posted.
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