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Old 02-13-2007, 09:17 AM   #1 (permalink)
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Stock Valve Springs.........

What is the maximum or safe limit for the stock valve springs in the '05 heads?

Could they support a .580 lift?

Just curious,

Steve
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Old 02-13-2007, 09:32 AM   #2 (permalink)
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Obviously they are different, so I don't know if this will help you or not, but... I have an '03 with stock springs. I have S&S 510g's. 37g's will be OK with stock springs too. I just spoke with Steve @ GMR last night, for ME to go to a 570 S&S, I have to change springs. Any help? If not, sorry for the wasted time.

P.S. Thanks again for the ST info!!
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Old 02-13-2007, 10:19 AM   #3 (permalink)
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I believe Harley went to using the bee hive springs in '06, which will acommodate .550 lift, maybe even .570. Prior to that, probably .530 would be about the limit.
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Old 02-13-2007, 10:47 AM   #4 (permalink)
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Just because the spring doesn't coil bind that is not the whole picture. The pressure of stock springs is all over the map and just fine for bolt-in cams. the ramp velocity of many of the grinds could float the valves at lower than expected rpms if there is not sufficient pressure to control the momentum. Use the pressure spring called out for the cam by the manufacturer.
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Old 02-13-2007, 07:49 PM   #5 (permalink)
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Quote:
Originally Posted by Geezer-Glide
I just spoke with Steve @ GMR last night, for ME to go to a 570 S&S, I have to change springs. Any help? If not, sorry for the wasted time.

P.S. Thanks again for the ST info!!

Yes, that helps me out. The 570 S&S cam has a .570 lift, and if you have to swap springs with a .570 lift then I'll definitely have to with a .580 lift.

I thought I had read that the stock springs were only good to a .510 lift, but I just wanted to check.

Steve
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Old 02-13-2007, 08:06 PM   #6 (permalink)
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<<< the springs dont need to be changed until you get to the se-253 cams and up.>>>

the 253 has a .538" lift, while the 255 has.550"... i would think the 253 is safer on the stock springs than the 255... but the beehive springs were 1st used on the '04 xl1200's, because the "E" cam has .551" lift and is bolt-on...
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Old 02-13-2007, 08:08 PM   #7 (permalink)
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The stock Beehives coil bind about.630 but all the disclaimers I mentioned before apply
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Old 02-13-2007, 10:24 PM   #8 (permalink)
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DRAGFORCE- right on! we just did a 103 BB with 255 cams on an 07 bagger at work- stock heads. havent road tested yet- will letcha know if youre interested.
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Old 02-28-2007, 08:28 PM   #9 (permalink)
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The stock beehives springs in the '05-'07 heads can handle up to a .650 lift.........from what I've been told.

I'm going with a .580 lift cam and I'm going to keep the stock beehive springs inplace......at the recommendation of the cam maker.

Steve
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Old 02-28-2007, 09:14 PM   #10 (permalink)
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Quote:
Originally Posted by MaineUltraClassic
The stock beehives springs in the '05-'07 heads can handle up to a .650 lift.........from what I've been told.

I'm going with a .580 lift cam and I'm going to keep the stock beehive springs inplace......at the recommendation of the cam maker.

Steve

yep..head quarters says ok to .650...i definitely trust Doug, but man that seems like a LOT, dont it?
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Old 02-28-2007, 11:40 PM   #11 (permalink)
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Hmmmmm

Fine I suspose. One small issue perhaps. The rated spring value is 140#@2" IIRC and the ones I tested from a ZERO MILE 07 last weekend were only 110# on the seat at 1.88. The numbers don't lie. The Rimac was checked with a checking spring and is within 2%
Coil bind no way. Inconsistent pressure and the possibility of loosing pressure due to the use of a performance camshaft over time, very possible. At bare minimum I would shim them to the same pressure.

One other point
"Requires our HQ-2007 valve spring kit" quote from HQ website for 0039.
But WTFDIK
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Old 03-01-2007, 05:46 AM   #12 (permalink)
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Quote:
Originally Posted by nw_guy4_fun
One other point
"Requires our HQ-2007 valve spring kit" quote from HQ website for 0039.
But WTFDIK
Here is another quote from the cam page on the HQ website -


Special Note: All head Quarters cams with lifts below .650 will work in stock 2005-2007 heads with original equipment conical (beehive) springs, valves and seals. Performance head work is recommended but not required.


The 2 quotes from the HQ website go against each other, but I got the word from Doug himself.

Steve
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Old 03-01-2007, 06:57 AM   #13 (permalink)
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Quote:
The rated spring value is 140#@2" IIRC and the ones I tested from a ZERO MILE 07 last weekend were only 110# on the seat at 1.88. The numbers don't lie. The Rimac was checked with a checking spring and is within 2%
I'm with nw_guy - 110 pounds seems pretty light for .580" lift cam. I would think something in the 160 pound range would be more of a minimum.
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Old 03-01-2007, 07:12 AM   #14 (permalink)
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I am not backpedaling but I did do a budget build with SE 251 cams (.579) and thestock 06 heads with HC pistons. It worked and was quiet. The springs were shimmed to 130# on the seat.
The 7mm valves are lighter and may need less pressure granted but the stock spring is crap as far as materials and I would not rust it to hold pressure over the long run. Up to 4500 or 5000 rpm no problem then over that roll the dice. Why gamble?
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Old 03-01-2007, 07:30 AM   #15 (permalink)
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Quote:
Originally Posted by MaineUltraClassic
The stock beehives springs in the '05-'07 heads can handle up to a .650 lift.........from what I've been told.

I'm going with a .580 lift cam and I'm going to keep the stock beehive springs inplace......at the recommendation of the cam maker.
What did you do, decide to pull it apart and go with the the 0039 instead of the 0034?
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