Beehives strong enough for TW68g?

[Burch753]

I just wanted to get some opinions for my newest project. Can beehives keep up with the ramps on a cam like the 68's? S&S's 720 springs are just so hard on the nose and even seats take a beating... My current woods triples are hard for my liking. Bike will be tuned to around 6500-6700rpm's (I have to restrict it there, I'm a heavy handed racer). PAC's??? Fueling Heavy Loads??? up to the challenge?

Thanks,
-Aaron-

[nw_guy4_fun]

I use them for the commodity type heads but in this case assuming the valves are heavy and big I say NO.

[Burch753]

I would consider the valves big...2.15 intakes, I suppose S&S knows the weights on them...

[Mother]

Contact PAC Racing!

[Burch753]

Originally Posted by Mother

Contact PAC Racing!

I'm reluctant of contacting companies directly... everyone I talk to has the best product on the market, lol. A little biased opinions. The people who are honest about the industries offerings are few and far between... I am however impressed with the PAC offerings. I was hoping for some more in depth insight... When I pull the trigger on these heads within the next 20 days, I can save some money if I tell them to keep the springs.

Cheers,
-Aaron-

[torqueinc]

PAC is not a normal company.

Call and talk to tech give them what they need for cam specs and see if they offer something they are confident will work.

If they dont have a beehive that will work one of the reverse wound dual springs for the LS I know for a fact will work

[Mother]

Burch call Kenny U. @ 216-390-4561 ask about the springs

[TXCHOP]

Anyone use PSI?

[torqueinc]

Everyone uses them,comp,lunati,ferrea,PBM,AV&V,Manley,S&S and others resell them.

One of the beehives they make should work for the TW68 the only problem I can see would be valvetrain weight.

If the springs they make can handle the valvetrain weight and aggressive profiles of a BBC a hyd roller in a TC should be no problem.

[Burch753]

so what are you guys' thoughts on the S&S .720 lift springs that I can get with these heads???... I dont have the numbers in front of me, but I remember thinking they were a little high for my liking, then again the motors I'm used to rev to 14k rpm, so I have little to base upon.

[torqueinc]

Not fond of any of the s&s springs,like to or not give PAC a call and have them give you a recommendation
They also make really nice retainers or depending on what spring you decide on there are some tool steel retainers on the market that are in between chromolly and titanium in weight that are damn near bullet proof to finish the combo.

[nw_guy4_fun]

It's all a crap shoot to recommend any specifics without all the vital data.

If they were here I suspect I may use SE dual springs, Comp TI retainers, SE spring seats, and 10° lash cap retainers.

There are many other workable substitutes.
Simple and easy would be just buy Woods W200, assuming the spring pack height is in the ballpark or with shims can get there, plus considering coil bind. Not too easy to machine the spring seats unless you have special tooling.

[Burch753]

I have the heavy duty Woods set-up now, and can't help but think they are beating the guts out of my seats, valves... Lots-o-pressure for something reving only to 6250 currently.... But I will leave this conundrum up to the professionals thanks for all of your input guys!

-Aaron-

[nw_guy4_fun]

But I will leave this conundrum up to the professionals

Good Plan
Remember you said the TW68
This is a grand daddy of cams and you have large heavy valves. Plus just because the springs have a high rate that does not mean the pressure can't be adjusted to suit the need by changing the spring pack height.
Lofting or floating a valve at what you call a relatively low rpm "something reving only to 6250" will ruin your day. There is not a beehive I have seen that I would use in this combo. Call PAC call PSI call COMP call anyone you want, the spring rate is just not there or in the case of one that has been suggested by some on these forums the PAC 1555 it would coil bind with typical HD spring pack dimensions.
If you are hell bent on beehives run less cam with less aggressive ramps.

[Mother]

Don, the 1555's would be set up for for the head being used