| Author | Message | ||
     Cjburr |
What is the life expectancy of these guides on a street driven motor ?? I have been told that 12000 miles is all you can expect from them......that would require me to replace the guides every 10 months.... I'm having a really hard time believing this Chris | ||
| Cjburr |
Talked to Goodson today and they have inspected these guides with 40000 miles on them and they had no appreciable wear. once again I have been subjected to B/S...at least I'm beginning to know what it smells like and not stepping in it any more  | ||
| Bad_karma |
Chris You might want to add roller tipped rockers if you don't already have some. They should help reduce the side loading on the valve and reduce the wear on the guides. joe | ||
| Cjburr |
thanks joe, I've been considering that as the person associated with the people who keep saying these strange things is the one who said I didn't need them with my cams. | ||
| Cjburr |
this is what Goodson had to say about the subject when I posted the question on their site. how long will they last Author: cjburr Original Posting Date: 01/29/2008 6:16am how long will your manganese valve guides last in a street driven Harley motorcycle ?? I have been told 12000 miles is all I can expect Threads for this topic: Author: Jim Posting Date: 01/29/2008 8:29am The valve guides are not simply manganese-bronze. Although the manganese portion is important as the foundation of the guide, (form holding, non-yeilding) the real difference from other guides is the alloying material Zinc. This alloy is the bearing material giving long life to the guide. Zinc is a well known bearing material with self lubricating property. Alloyed at nearly 30 percent zinc, the guides far surpass the wear charicteristics of previous bronze guides. The guides, used with the black finished valve stems, have given customers 2 to 3 times the milage you indicate. Author: cjburr Posting Date: 01/29/2008 11:11pm even at 3 times that´s only 36000 miles, to me that´s replacing them every 2 1/2 years. People are getting 60000 and up with the stock guides from what I´ve heard, can you tell us what the advantage is to using these guides if they won´t last as long as stock guides ?? or am I misinformed about the mileage you can get from the stock guides. thanks for the info, Chris Author: Jim Posting Date: 01/30/2008 10:42am This is all the confirmable, that means real, info I have. There are probably many with more miles, I can´t prove that. What can be proved is two instances of being torn down to install larger valves and cam at the 40K miles, were still within specs. So there is going to be more miles on those. Author: cjburr Posting Date: 01/30/2008 6:13pm thank you very much for your time and knowledge, this has been most helpful and informative for me. I appreciate you telling me only what you can actually confirm and not speculating. I will speculate myself though, it seems if at 40000 miles they were still in spec then you could probably use them with confidence that they would last as long as stock ones, perhaps longer. Thank you once again, Chris They were very nice people to deal with on the phone and I'd have to recommend them for diy'ers. One interesting note is that they use a single reamer for the exhaust and the intake guides. The reamer should give you .001 on the intake and the exhaust valve they use is .0005 smaller on the stem giving you .0015 on the exhaust. Don't know if this is common practice or not, but it seems to be a viable way to save a little cash by only needing 1 reamer. Chris | ||
| Bad_karma |
Chris I have the rollers in both my S's and in two of my vehicles. I'm wondering if it would be possible to get these valve guides in the Xb valve stem size? Would like to run the lighter valve and beehive spring to get the 7100rpm that buell has found. Go info for consideration in next build. Joe | ||
| Cjburr |
I would call them and ask, very nice folks to deal with. I don't see why it wouldn't be possible. | ||
| Panic |
The max mileage won't really be linear. In addition to roller tip vs. plain, more lift and more spring pressure also shorten guide life considerably, as does incorrect assembled geometry. | ||
| V74 |
so whats so good about these guides,why would you want them ?by the way bad-karma i want 7200 rpm with max power at 7100 giving me a 100rpm over rev,light weight valve train,forged pistons,ignition up grade and cams are on my shopping list to achieve this,hope my lottery numbers come up lol. | ||
| Bad_karma |
Stephen It gets easier every year to under stand why people rob banks. Thats pretty close to my next upgrade for the S1 but would like to keep peak HP around 6700 to 6800 and bring the torque up to around 5000 to 5500. It's a mountain/track bike so long life(100,000 is not a goal or requirement). Might be narrowing the powerband too much.  Joe (Message edited by bad_karma on February 02, 2008) | ||
| V74 |
you got that right,by the way,max reliable piston speed for a road bike is 23 m per second making the max rpm of a 1200 buell 7200,over that number and your into race spec engines,with there regular tear downs,as long as you put the engine together well and with some thought on its internals it should be as reliable as the next buell.back to this thread , these valve guides,whats so good about them,are they extra slippery or something ??? | ||
| Cjburr |
check here V74 perhaps it may answer some of your questions. http://www.av-v.com/TechnicalInfo.htm it seems most shops are using these guides nowadays. | ||
| Bad_karma |
Stephen Nice info. With some assistance such as roller rockers, light weight valves to allow for less spring pressure all things else the same should be able to rev higher with the same dependability. Good thread. joe | ||
| V74 |
thanks Cjburr,that makes interesting reading and i will consider these guides when the time comes for replacement. |
