| Author | Message | ||
     Ezblast |
Terry - what cam would you suggest for the track, and what cam would you recommend for the street? Also what was the bore and stroke of your 650cc bike and what will be bore and stroke of your 750cc and did/does it vibrate a lot more than the stocker? How much weight you take off the crank? GT - JBOTDS! EZ  (Message edited by ezblast on June 01, 2007) | ||
| Sportymark |
Yeah i figure the XB cams should be pretty decent as they are an upgrade over the stockers, but everybody always talks about how not rough they are, plus we are still gonna have the stock size XB valves, which bigger than stock Blasters will nto be out of this world. As for exhaust it has a Kerker on it, and for the LSR runs gonna make a removeable cap ont he resonance tube to basically open it up. And hopefully the XB12 gearing...that shoudl get us the ECTA 500CC record and hopefully be as rideable as it was before....hopefully | ||
| Gearheaderiko |
The Blast piston isnt really compatible with an XB head (if thats what the XL'04 head is). Use an XB piston and save a lot of work. Your setup (basically a stock XB top end) is very streetable (should've come stock) and will run out to 7500 rpm no problem, but depending on exhaust and tuning the power will drop of before redline.I think the Kerker's going to hurt you there. Are you using XB cams or the SE XL'04 cams (same grind) that bolt right in. The XB cams (allegedly) need a custom timing cup. Are you using stock pushrods and lifters? I found that using a modified XB head that the valves needed regular adjustment (every other race weekend) but the bone stock XB head we're running now hasnt needed any at all. I assume your using adjustable pushrods and better lifters? You'll need to make a custom top tie bar mount (or not use it-some dont)Fairly easy. I used a piece of bent angle iron and its held up for over 5000 miles. }"And for those of you that frequent the yahoo board don't post anything on there about this yet, it's still a suprise."LOL! Not a problem! Brian Nallin at Revolution Performance can help you out with the correct piston. | ||
| Buelldyno_guy |
EZ the RS 585-V2 work well on the street and track on the XB's and they worked well on the 600-cc (597) bike we ran in 03. It made 53 RWHP and 30 ft/lbs of torque. BTW: That Kit with Head and the RS 585 Cams are for sale, with only three 3 mile runs and some dyno time back in 03. The current 650 is a under-squre 3.625 x 3.813 for 644.7-cc. The new 750 class engine will go over-square at 3.875 x 3.813 for 730-cc. It will have a new head due to the new combustion bore size. We will have the 650 Kit in a box so we could swap back should someone break that record. ... Terry | ||
| Sportymark |
I solved teh custom timing cup on the XB cams issue by having a new cup notch machined into the cam, so I just need to put the cup aligned with the right notch. I have not done anything yet with the lifters and pushrods as I have not torn it down, but you suggested staying away form the adjustable due to weight. Do you think we can get a new piston and keep the 500cc displacement? When it comes to the head it will mearly have a good port and polish, along with new valves/seals/springs/retainers/rocker arms but was not planning on doing any weird stuff to it, as we still want it as reliable as possible. basically wanted to keep the bottom end stock, and jsut do top end improvements. As for the exhaust, once the cap is removed it will essentially be a straight pipe, but one we can cork up for street duty. | ||
| Ezblast |
Thanks Terry - what type of clearancing issues did you experience with the 585 cam and what length pushrods did you use? GT - JBOTDS! EZ (Message edited by ezblast on June 01, 2007) | ||
| Gearheaderiko |
Stock rocker ratio is 1.625. I dont know displacement of a .015 over piston, but I dont think its over 500cc. "but you suggested staying away form the adjustable due to weight." No, I dont think I said that.  I would definitely go with adjustable pushrods and collapsible tubes. You're not going radical with the engine, so valvetrain weight is not a big issue. Also, if you're having problems and stick with the stock pushrod cover, there isnt an easy way to check clearances. Having the pushrods easily accessible can answer a lot of questions quickly. I think I had to adjust the pushrods frequently with the new head is that it would still continue to 'break in' (especially with the hi tension valve springs) and throw the adjustment out. The stock XB head I just installed had 8000 miles on it and with stock valves and springs, it was already broken in. Are you using the updated/racing oil pump drive gear? | ||
| Sportymark |
sorry was refering to Buelldyno_guy about the pushrods. Have not upgraded the oil pump gear. Workin on a shoestring budget, so everything counts....might have a line on a stock XB9 piston... | ||
| Gearheaderiko |
Not so sure waiting on the oil pump drive is such a good idea anymore. This bike was a 2000 with 8000 miles. Took the oil pump with it, probably a lifter and left lots of little bits in the engine. Too be fair, I dont know if the pump or gear went first, but since they've updated the gear, I'd conclude that the gear was the likely cause.  | ||
| Sportymark |
i will check it out when we do the cams. | ||
| Buelldyno_guy |
EZ, originally Zippers (AKA) Red Shift used your old cams as cores, so if you sent them cams with the newer high contact gears, four week later you got back a set you thought were your old ones with the new cams welded on. But sometimes you get the new cams welded onto someone else's gears. Now if they are all the new High Contact profile gears not a problem, but you got the old fitted gears and your pinion is a High Contact. You have an issue. Buell now only sells the newer cams in sets all High Contact. Stop past a dealer and ask a tech if they have a sample of each you can tell them by the gear tooth profile. On the 600 push rods I used half a set of S/E adjustables. Now Brian has a set of adj ones for the Blast... Terry (Message edited by buelldyno_guy on June 01, 2007) | ||
| Buelldyno_guy |
Erik the gear is a known weak stop and it goes first and the pieces take out the pump. The but issue is if the filter by-passed allowing metal into the oil passages in the case leading to the crank. ... Terry | ||
| Gearheaderiko |
Thanks Terry. Since it wasnt my bike and was reportedly being ridden (hard) by the owners son, who may have run it out of oil, I couldnt be sure which went first. Thanks again for stopping by, helping out, and updating us on your Blast. | ||
| Gearheaderiko |
Mark, I'm still amazed that through all the XB cam/timing cup issue discussions I've read, that nobody brought up just adding another notch to the cam! Simple! | ||
| Buellistic |
Gearheaderiko: "YOU" amaze me !!! Thinking out of the "BOX" are you ... In BLASTing LaFayette | ||
| Sportymark |
Anybody know what the CC on the chamber on the Blast head is? | ||
| Blake |
Since compression ratio (CR) is equal to displacement (Disp) plus the chamber volume (Vc) all divided by chamber volume (Vc)... CR = (Disp + Vc)/Vc Simplifying and solving some basic algebra we can find Vc (See your teacher was right, you need this stuff.)   ... From the distributive property of division, we can rewrite the above equation as follows: CR = Disp/Vc + 1 We can then rewrite the above to solve for Vc as follows: CR - 1 = Disp/Vc Vc(CR - 1) = Disp Vc = Disp / (CR - 1) Putting in the actual numbers we have... Vc = 492cc/(9.2 - 1) and finally the answer is... Vc = 492cc/8.2 = 60cc  That's the nominal theoretical value based upon Buell's published displacement and compression ratio. Actual chamber volume may vary slightly. (Message edited by blake on June 11, 2007) | ||
| Gearheaderiko |
Sweet! | ||
| Sportymark |
thanks... that helps a ton. | ||
| Buellistic |
62cc In BLASTing LaFayette | ||
| Ezblast |
 | ||
| Blake |
LaFayette, Where did you get the 62cc value? Darn published/nominal specs are often inaccurate, but geeze, that would put the CR down around 8.9. | ||
| Buellistic |
Blake: Read it some where ??? "AND" was checking you attention level ... By the way it is very good ... In BLASTing LaFayette | ||
| Blake |
I got lucky this time. | ||
| Gearheaderiko |
For future reference-the difference in combustion chamber of the 2 heads. The XB head is on the left, Blast on the right. Both are 10.5:1 pistons.You can also see how much more fin area the XB head has.  | ||
| Ezblast |
The Blast head does look to be the better flowing head though. GT - JBOTDS! EZ | ||
| Swampy |
Compare port shots, can you? Also, did you happen to find a big crate of them some where to so they can be shared amongst fellow Blastards? | ||
| Gearheaderiko |
That 'crate' would be the Badweb classifieds! I got mine there. One new and complete. The other bare with a stripped spark plug hole. Both cheap! | ||
| Buellistic |
Valves ??? In BLASTing LaFayette | ||
| Gearheaderiko |
Valves? |
