rebuild, but not a honda
- dannygraves
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not sure yet if i can make this work but im going to try. honda rod and bearings are much beefier and will add alot of strength. sizing things up to see if i can stuff it in there.
got alittle over .055" now but the honda big end is bigger. maybe trench the cases alittle and machine down the big end. pin will also be 2mm bigger.
![Image](http://i67.photobucket.com/albums/h318/clyde111112/P1010287.jpg)
need 3mm more width here.
![Image](http://i67.photobucket.com/albums/h318/clyde111112/P1010290.jpg)
the part in green is pretty thin. im alittle concearned with taking any material out of that area.
![Image](http://i67.photobucket.com/albums/h318/clyde111112/P1010288.jpg)
where do you guys think the most stress on the rod is ? the big end or small end ?
got alittle over .055" now but the honda big end is bigger. maybe trench the cases alittle and machine down the big end. pin will also be 2mm bigger.
![Image](http://i67.photobucket.com/albums/h318/clyde111112/P1010287.jpg)
need 3mm more width here.
![Image](http://i67.photobucket.com/albums/h318/clyde111112/P1010290.jpg)
the part in green is pretty thin. im alittle concearned with taking any material out of that area.
![Image](http://i67.photobucket.com/albums/h318/clyde111112/P1010288.jpg)
where do you guys think the most stress on the rod is ? the big end or small end ?
- Roostius_Maximus
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only place i've ever seen a rod that style fail is about 1 cm under the wristpin area, just pulls the top off and augers the cases out. Hard to say what started it, could have been wedging up with the piston skirt ontop of the crank, under the wristpin that pulled it apart
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- dannygraves
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from left to right: cr250, ktm 550, cr500
what was ktm thinking when they put this flimsy fuggin bearing in a huge single cylinder
. several people told me stories of rod failures, now i see why....... the lower bearing is just as cheesy. im definatly going to have to put the cr500 rod in.
![Image](http://i67.photobucket.com/albums/h318/clyde111112/IMGP0260.jpg)
![Image](http://i67.photobucket.com/albums/h318/clyde111112/IMGP0258.jpg)
what was ktm thinking when they put this flimsy fuggin bearing in a huge single cylinder
![Confused :?](./images/smilies/icon_confused.gif)
![Image](http://i67.photobucket.com/albums/h318/clyde111112/IMGP0260.jpg)
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Last edited by 100hp honda on June 15th, 2009, 6:35 pm, edited 1 time in total.
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i like the roller bearings also. i asked a few motor builders about the 550, they said it can make good power. hopefully the rest of the motor will hold together. im going to iron out the rod issues so that will be plenty strong, and the tranny looks to be plenty strong also. im praying the clutch holds up. i put a magnet on the clutch plates, the fibers AND drive plates are all steel..........the basket might explode thoughdannygraves wrote:I like those beefy roller bearings they use! Snap some shots of the ports for us, I'm liking the 3 pairs of transfers, and a big boost port!
![Laughing :lol:](./images/smilies/icon_lol.gif)
![Crying or Very sad :cry:](./images/smilies/icon_cry.gif)
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Last edited by 100hp honda on June 15th, 2009, 6:39 pm, edited 1 time in total.
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heres the shop thats having wiseco make the pistons.Exnav wrote:What did you decide to do about a piston?
http://www.seven4racing.com/motoshop.htm
aparently there is some family trouble or something, and thats whats causing the delay.....from what ive been told anyways. im going to wait and get the wiseco piston, honestly i dont care for the mahle design. im sure they are excellent pistons, i just dont like the way they designed the 550 piston. i hope wiseco designs the new piston similar to the cr500 with a solid wristpin boss area, it will make it stronger for when i put the honda rod in there, because the honda rod small end is 7mm wider than the ktm rod.......im going to have to do some machining somewhere to make it fit.
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- dannygraves
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well i have to say, even with the ktm rod, i dont think the 550 had rod angle issues. i believe the cheesy bearings and flimsy rod were the areas causing the failures. the honda rod is 2mm longer, so it will decrease the angle slightly and put the rod ratio alittle closer to what the cr500 has. over all i think the honda rod will work very well in this application, its alittle longer and a shit load beefier, and theyre only like $90dannygraves wrote:how does the rod length work out?
I'm loving that port layoutalready figuring in my head where I want to remove some material
![Laughing :lol:](./images/smilies/icon_lol.gif)
im not sure what the "ideal" rod ratio is for 2strokes, but ive read 1.8 works good in alot of v8 race engines. im definatly no expert on this stuff though, so i could be wrong on some of it.
heres some ratios i calculated. the smaller the number, the more rod angle:
kx500 1.68
cr500 1.82
ktm 550 with honda rod 1.75
what you doing on your head ?
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found out some info on the piston tonight. i was told by a reputable source the 550 wisecos will be ready with in 4 weeks. i guess they will have some new coating on the dome and skirt. from what i understand, it will also use a "dykes" style ring. i havent read much info yet on that style of ring but i hope its a tried and proven design for hi performance.
- dannygraves
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- Roostius_Maximus
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not like total seal, like oldschool hemi
the ring is an L shape, fiting the piston lower part in and the tall shelf allows it to "catch" more pressure to hold it down in the ringland.
some sled stuff is the same, mostly single ring applications tho. In some sleds the top of the ring is actually flush or above the outer lip of the pistons crown
a crappy phone picture
![Image](http://w8raqa.bay.livefilestore.com/y1pRbGFV24jzoogvp1pxut4JwX7072HS-UqZq3MJB1AMFWjBF8e-cJhVph7UhQ4usuA-k5pqdFAeiSBXOhJ_NQBSByZ3th2sF-U/IMG00931.jpg)
the ring is an L shape, fiting the piston lower part in and the tall shelf allows it to "catch" more pressure to hold it down in the ringland.
some sled stuff is the same, mostly single ring applications tho. In some sleds the top of the ring is actually flush or above the outer lip of the pistons crown
a crappy phone picture
![Image](http://w8raqa.bay.livefilestore.com/y1pRbGFV24jzoogvp1pxut4JwX7072HS-UqZq3MJB1AMFWjBF8e-cJhVph7UhQ4usuA-k5pqdFAeiSBXOhJ_NQBSByZ3th2sF-U/IMG00931.jpg)
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- Roostius_Maximus
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![Image](http://www.datafan.com/TunersHandbook/2-strokefiltered_files/image006.gif)
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- dannygraves
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1.8 is a good overall rod/stroke ratio but for good life out of a high winding 2 stroke motor 2 is ideal for piston and rod life. For our 500's even getting them reving to 8500 rpms and still making power 1.8 is fine.
other than some sled rods I have seen, you don't get much stouter than a CR 500 rod. I haven't seen another big 500 cc single motorcycle rod that comes really close.
Cool port layout on the KTM, my TRX puma cylinder looks very similar to that design with three smaller transfer ports and the triple exhaust port lay out.
other than some sled rods I have seen, you don't get much stouter than a CR 500 rod. I haven't seen another big 500 cc single motorcycle rod that comes really close.
Cool port layout on the KTM, my TRX puma cylinder looks very similar to that design with three smaller transfer ports and the triple exhaust port lay out.
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LOVEMYCR500 wrote:1.8 is a good overall rod/stroke ratio but for good life out of a high winding 2 stroke motor 2 is ideal for piston and rod life. For our 500's even getting them reving to 8500 rpms and still making power 1.8 is fine.
other than some sled rods I have seen, you don't get much stouter than a CR 500 rod. I haven't seen another big 500 cc single motorcycle rod that comes really close.
Cool port layout on the KTM, my TRX puma cylinder looks very similar to that design with three smaller transfer ports and the triple exhaust port lay out.
ktm has used almost this same port layout since the early '90's and maybe even the late '80's. im wondering if calvin "borrowed" some of the ktm ideas when he designed the puma, they look real similar. maybe just a coincidence
![Laughing :lol:](./images/smilies/icon_lol.gif)
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heres another one i picked up the other day. it gots a pwk, radvalve, and the old style fmf fatty
. the previous owner was a total dumbfuck and half assed a few things but otherwise its pretty decent for being 15 years old. im realy stoked about the power these motors have, its just a damn shame theres no reasonable way i could fit it into a AF chassis
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- dannygraves
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- Roostius_Maximus
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nice bike, the lil cuz is hunting for one since the weekend, seeing as how he'd break contract on a honda 500
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