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Post by nelson on Apr 2, 2014 7:19:40 GMT -5
if i buy that kit that will be a drop in rougly 12% of cc's ! but at that price i muight just get it to experiment with! thank you for the link!
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Post by moofus02 on Apr 2, 2014 7:58:55 GMT -5
if i buy that kit that will be a drop in rougly 12% of cc's ! but at that price i muight just get it to experiment with! thank you for the link! I know what you are saying but when the bore gets bigger you lose boost and transfer port area that's why 2strokd picked up a half second et by going from a 54 to a 52mm. I wouldn't worry about the drop in displacement at that price but I am curious if it is really an 8 port as the pic shows and how good the Cylinder is some of the replacements have Poor sized castings (Brent had a stock replacement 40mm Cylinder that the boost port tunnel was half the size of the original) at that price in thinking of buying one to see what it's like Sent from my SPH-L720 using proboards |
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Post by 2strokd on Apr 2, 2014 8:15:58 GMT -5
Thanks for noting that moofus  . We actually changed a bit more than the bore. We also switched to a newer design Peace Pipe of Johns. better suited for a high revving smaller bore. Not to mention that bore was farfromstock  I was a little less than thrilled with the latest Autotech (Motoritec) 54mm LC cylinder kit I recently got. Its been a few years since ive seen a "stock" one but the port edges inside the cylinder are rough and need work.. The exhaust port is small ID and OD with rough walls... Ive spent an hour on the cylinder already and have barely touched the ports other than chamfering the edges. I first ran a 240g ball hone through it because the factory cross hatch was almost non existent. Now its good! Its tough to know when to stop sometimes when it is not your engine. The owner can only afford so much.. Often I catch myself spending way too much time on one specific point. |
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Post by moofus02 on Apr 2, 2014 8:48:53 GMT -5
Thanks for noting that moofus . We actually changed a bit more than the bore. We also switched to a newer design Peace Pipe of Johns. better suited for a high revving smaller bore. Not to mention that bore was farfromstock I was a little less than thrilled with the latest Autotech (Motoritec) 54mm LC cylinder kit I recently got. Its been a few years since ive seen a "stock" one but the port edges inside the cylinder are rough and need work.. The exhaust port is small ID and OD with rough walls... Ive spent an hour on the cylinder already and have barely touched the ports other than chamfering the edges. I first ran a 240g ball hone through it because the factory cross hatch was almost non existent. Now its good! Its tough to know when to stop sometimes when it is not your engine. The owner can only afford so much.. Often I catch myself spending way too much time on one specific point. I know it is far from stock but as you say it is all in how it flows. You are not the only one to tell me some of the stock replacement cylinders have crap ports. I just wish I could hold stuff in my hand before I bought lol. I was talking to someone a while back that said when they went from a 52 to a 54mm bore they lost 1000 rpm. Said it was like a wall they couldn't get past. Ran good but wouldn't rev like the 52mm Cylinder would. Sent from my SPH-L720 using proboards |
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Post by nelson on Apr 2, 2014 9:29:56 GMT -5
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Post by nelson on Apr 2, 2014 18:41:05 GMT -5
Does anyone have a recommendation as to what rpm range my pipe would make the most power? They sure don't give a lot of info on these pipes. I guess they are for people who just put them on and go. How are u supposed to tune a cylinder if u dont know wbat range the pipe is for? Yoou are supposed to port to pipe right? Maybe one of you pipe wizzrads can tell me I assume 7-10 k? |
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Post by Deleted on Apr 3, 2014 10:30:31 GMT -5
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Post by nelson on Apr 3, 2014 22:55:59 GMT -5
Not much on there in rguards to the 100cc next r. I would assume it runs the same as a 70cc excepg with 90cc and next r pipe
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Post by moofus02 on Apr 4, 2014 12:35:46 GMT -5
Not much on there in rguards to the 100cc next r. I would assume it runs the same as a 70cc excepg with 90cc and next r pipe You could pm 190mech he had the specs off of my pipe. I'm sure he could give advice on the rpm range to set it up for Sent from my SPH-L720 using proboards |
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Post by nelson on Apr 5, 2014 14:46:55 GMT -5
my 50 millimeter kit arrived I measured the inside of the head where the piston comes into the cylinder and it is 52 mm I need to measure the o/d off the top of the piston
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Post by nelson on Apr 5, 2014 16:36:39 GMT -5
 Here is the measurement of the head that came with the 50mm cylinder I haven't measured the 52mm head so I don't know what it should be at for a 52mm cylinder/piston |
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Post by nelson on Apr 5, 2014 16:41:52 GMT -5
I think I am going to smooth out the combustion chamber a bit with some sand paper.
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Post by moofus02 on Apr 5, 2014 17:11:49 GMT -5
Got any pics of the Cylinder and ports? Does it have auxiliary exhaust ports?
Sent from my SPH-L720 using proboards
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Post by 90GTVert on Apr 5, 2014 18:23:51 GMT -5
The head should match up to the bore. You don't want a mushroom shape up there. Hard to tell in the pic. Is it an as cast area, then a narrow step, then the head surface? That's odd.
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Post by 190mech on Apr 5, 2014 20:06:31 GMT -5
Not knowing what is in the inside of the pipe ,the tuned length calculation is a WAG(wild ass guess).90+ motors tend to go flat at 10,000 or so because of their poor transfer tunnel design.If it was a hollow pipe,it would have around a 9000 rpm limit..
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. We actually changed a bit more than the bore. We also switched to a newer design Peace Pipe of Johns. better suited for a high revving smaller bore. 
