Dart heads rev em how hard?
Thread Starter
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Joined: Nov 2007
Posts: 458
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From: Birmingham UK
Dart heads rev em how hard? I have a new set of Dart 225's on my motor and will be camming it soon. How hard are you guys revving these springs to? I want to set the rev limit up to a safe limit, i have a soft and hard cut facility on my ECU, i had the cam custom ground and shift point should be 6600, with a redline of 6800. Can they handle this ok?
What's the lift. Those springs should be the PSI 1511's with titanium retainers. They should rev that high no problem unless you have some huge lift. They will rev higher than equivalent duals.
I have a new set of Dart 225's on my motor and will be camming it soon. How hard are you guys revving these springs to? I want to set the rev limit up to a safe limit, i have a soft and hard cut facility on my ECU, i had the cam custom ground and shift point should be 6600, with a redline of 6800. Can they handle this ok?
Thread Starter
10 Second Club
Joined: Nov 2007
Posts: 458
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From: Birmingham UK
Had a cam specced for me 232/236 .625/.629, its being ground to run with my 1.85 rockers, so this is how it pans out at the valve end. I also noticed on the spec sheet it is XE lobes, easier time for my valvegear i assume with the higher ratio rockers. No bad thing. Just wondering what you can safely rev these to. I know theres no point going way past peak.
I think you better run some numbers and measure your installed height. Those springs are excellent, but they are installed at approximately 1.765" (from memory) so I think you may hit or be close to coil bind with that cam. The springs will keep up with most any cam, but if you bottom them that's another issue. With that stout a setup, you may need something like a set of Crane 833's, which have a high seat value and more stiffness.
Had a cam specced for me 232/236 .625/.629, its being ground to run with my 1.85 rockers, so this is how it pans out at the valve end. I also noticed on the spec sheet it is XE lobes, easier time for my valvegear i assume with the higher ratio rockers. No bad thing. Just wondering what you can safely rev these to. I know theres no point going way past peak.
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Had a cam specced for me 232/236 .625/.629, its being ground to run with my 1.85 rockers, so this is how it pans out at the valve end. I also noticed on the spec sheet it is XE lobes, easier time for my valvegear i assume with the higher ratio rockers. No bad thing. Just wondering what you can safely rev these to. I know theres no point going way past peak.
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The springs on the Darts are excellent springs, but based on your setup you really need to measure and figure it out. I put my setup into a spreadsheet to see the seat numbers and clearances with my setup. Since you have recessed the valves, you may find your seat values are very low since these springs don't have a lot of seat pressure at 1.8 and you are more than 1.8 you may already have an issue. I would take some measurements on the work bench prior to installation, its a heck of a lot easier.
LS1511ML Beehive
OD - 1.290"
ID - .630"
Seat Pressure - 120lbs@1.800
Over the nose - 360lbs@1.175
Rate - 384
Max lift - .625"
Coil Bind - 1.100"
So at 1.800" installed height with the cam you plan on running, you will have an issue.
Looking at the PSI specs for the LS1511, I was incorrect. The specs for these springs are as follows:
LS1511ML Beehive
OD - 1.290"
ID - .630"
Seat Pressure - 120lbs@1.800
Over the nose - 360lbs@1.175
Rate - 384
Max lift - .625"
Coil Bind - 1.100"
So at 1.800" installed height with the cam you plan on running, you will have an issue.
LS1511ML Beehive
OD - 1.290"
ID - .630"
Seat Pressure - 120lbs@1.800
Over the nose - 360lbs@1.175
Rate - 384
Max lift - .625"
Coil Bind - 1.100"
So at 1.800" installed height with the cam you plan on running, you will have an issue.
Katech loves these springs. They did a bunch of testing and selected them for their 427 packages. These are one of the best beehive springs out there, but like anything else within limits.
1.800 Installed height - .060 minimum spring clearance = 1.740 safe installed height
1.740 safe installed height - 1.100 coil bind = .640 max lift
It seems that PSI specifies more clearance for safety.
Last edited by 405HP_Z06; Jan 9, 2008 at 08:27 PM. Reason: Minimum coil clearance error
Yes you could, but keep in mind that you would be slightly below (.010) the recommended minimum coil bind clearance.
Thread Starter
10 Second Club
Joined: Nov 2007
Posts: 458
Likes: 2
From: Birmingham UK
IF the valves have been cut back by 0.030 as my vendor says they have ( will measure to be sure.) then ok? Can you buy a valve spring tool and if what sort of money are they? Thanks
http://store.summitracing.com/egnsea...115+4294853226
You need the mic that measures 1.600" - 2.100"
Last edited by 405HP_Z06; Jan 11, 2008 at 09:11 PM.