| Author | Message | ||
     V74 |
can i do a straight swop with my twin valve springs on my 99 m2 for single beehive valve springs from an xb?if not what must be done to get them to fit ? | ||
| Alessio66xb12r |
xb uses 7mm valve stems so the spring plates you have on your 8mm stems does'nt fit on single beehive xb springs and the xb spring plates and locks does'nt fit on your 8mm stems .....if you want to stay with your valves you must change springs plates and locks. bye Alessio | ||
| V74 |
ok,could i use xb spring plates machined to accept my valves and locks,if the inner spring dia of the inner spring is the same as the inner dia of the beehive spring and the free and loaded length of the outer spring is the same as the beehive spring they should be a straight swop ? | ||
| Alessio66xb12r |
when i did an 883/1200 conversion on a 2004 883 xl i changed the original 7mm valves with the bigger 1.710 8mm and i machined a set of 1340 evo spring plates to fit the original beehive springs ( using the 1340 locks). honestly it was a pain ... but its doable. better ask rev.perf. .....i think they handle beehive spring plates and locks for 8 mm valves , this is what you need. check springs pressure before assembling. bye Alessio | ||
| V74 |
thanks,will do. | ||
| Alessio66xb12r |
"ok i could use..." machining the lock seats is not a good idea for me ...... better machining your plates to fit beehive springs . . bye Alessio | ||
| V74 |
am currently running titanium plates,have kept the originals so if i had one xb plate for comparison maybe its a go. | ||
| V74 |
am just installing the lightweight pushrods,so far have done the rear next is the front ones,what is the theoretical max rpm and lift with my stock valve springs with the ti retainers and ally pushrods ? | ||
| Jadow |
It has been a question that needs an answer. Stock heads from HD (twin cam) use be hive springs but any performance heads from the factory come with the old fashion triple spring pack. If the single spring is so superior and NASCAR developed them then how come when your raise the HP they don't offer a "racing" bee hive spring? Can anyone share what the race track Buells are running? | ||
| Blake |
The XBRR engine uses two nested springs. My guess would be that the higher rate springs in a beehive form constitute a non-standard spring and would be mongo expensive special order for such limited quantities. Or maybe the geometry and space limitations favor the nested configuration. Or both? | ||
| V74 |
thats interesting,thanks for that,just wanted to know how easy it was to drop in a set of behive valves,with thier benifits into my thunderstorm heads,keeping the oem valves,didnt think it would be this hard, | ||
| Newxb12ss |
The factory beehives are calibrated to operate with a spring seat pressure that will allow the lightweight 7mm valves to turn 7,100+ rpm reliably. If you don't have access to known values for your application or a fixture to spin a head and valves up to the required rpm for testing, a valve crash could ensue. A spring tester is also a good tool to accurately determine seat pressure at assembly. Beehive springs are available for high-performance cars as well. |
