Author Topic: MM "beehive" valve springs (Read 3825 times)

stereomotional · « **on:** June 09, 2008, 07:10:25 PM »

anone use them? im reading their site, and they give no advantage to them besides that when using the beehive spring with their 6mm retainers you save 25g...which is pretty impressive, but reliable??? i always thought that people upgrade to double springs...

futron.sim · « **Reply #1 on:** June 09, 2008, 10:21:50 PM »

I thought their springs are stiffer compared to stock ones?

Boyracer · « **Reply #2 on:** June 09, 2008, 11:57:45 PM »

No idea about their stiffness but lower weight would be advantage as it moves resonance frequence upwards and then engine could be revved higher.

Also because they are not cylinder in shape, their resonance frequence is not in one specific frequence, rather the resonance is spread over larger rev area. This means that there is no narrow rpm band where spring loses it's stiffness but wider one where the spring loses some of its stiffness.

Double springs have two two resonance frequencies and usually they are different form eachother. So atleast one of the two springs can offer some stiffness even if the other is in it's resonance revs. Bad side is that this setup weights more.

stereomotional · « **Reply #3 on:** June 12, 2008, 08:45:02 PM »

i work with a guy who has a turbo d16 drag crx who runs these style springs. he said that he can rev much higher, and his are lighter...compared to his old setup consisting of double springs. im getting more convinced

peerless · « **Reply #4 on:** June 12, 2008, 11:10:33 PM »

I have a customer running a set of MM 'BeeHive' springs. The main benefit to them in regards to the M20 is that they have a higher seating pressure then stock yet at the same time have less pressure on the nose of the rocker at full lift. The problem with the M20's is a rather weak rocker arm design and with high lift cams on the stock dual spring setup you are imparting too much pressure on the nose of the rocker therby increasing it chance for failure.

Also they are not that much more then the stock spring setup. Stock dual springs brand new run about $200, the bee hive springs for the M20 are $240.

The advantage is the same on the M42 in regards to spring pressures. Unless your running a aggressive cam I see no reason to upgrade beyond the stock springs.

redmist · « **Reply #5 on:** July 01, 2008, 05:07:45 PM »

I use them in all my cars primarily to reduce the risk of rocker breakage. Cars seem to perform better (SOP) at higher rpms.