Re: 572 cam recommendation
[Re: 301v]
#2536225
08/14/18 03:51 PM
08/14/18 03:51 PM
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Joined: Sep 2017
Posts: 41 Kentucky
301v
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Headers are fab shop 2 1/8 to 2 1/4 with a 4 inch collector
No clue what the heads flow. Just bought them from indy and had them milled to 62cc and cnc'd . I know they need more work but i always like running them the first then over the winter work on them and see what difference is made.
Last edited by 301v; 08/14/18 03:55 PM.
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Re: 572 cam recommendation
[Re: 301v]
#2536233
08/14/18 04:02 PM
08/14/18 04:02 PM
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Joined: Jan 2003
Posts: 19,537 Las Vegas
Al_Alguire
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We have run B1, Indy -1 345CNC and OOTB -1 heads on the car. The cam in the 345 head and b1 heads were similar. The 345 head went 4.80's here in Vegas in GOOD air for here.
FWIW we run a MUCH smaller header as well. I know you know this but in a dragster with a glide the converter is gonna make or break the deal. We try to get to 6-700rpm drop on the shift. We have been 1.02 60' here in Vegas as well on a little bubba.
The entire car is apart now and we are redoing it from end to end. Also building a new engine, hoping we can go .50's here, not sure we will get there but that's the goal.
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: 572 cam recommendation
[Re: 301v]
#2536329
08/14/18 06:38 PM
08/14/18 06:38 PM
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Joined: Sep 2017
Posts: 41 Kentucky
301v
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K motion k950 springs installed at 1.950 i do believe. The rule of thumb is .060 between coils correct to prevent coil bind.
I do have a ton of valve to piston clearance since the pockets in the pistons are a little deep.
Last edited by 301v; 08/14/18 06:39 PM.
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Re: 572 cam recommendation
[Re: 301v]
#2536347
08/14/18 07:20 PM
08/14/18 07:20 PM
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Joined: Jan 2003
Posts: 14,531 So. Burlington, Vt.
fast68plymouth
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To step up to some faster lobes(I wouldn’t bother changing the cam otherwise), you’ll want to do something different with the spring pack.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: 572 cam recommendation
[Re: 301v]
#2536535
08/15/18 12:35 AM
08/15/18 12:35 AM
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Joined: Jan 2003
Posts: 4,203 Shelby Twp. Mi
HardcoreB
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Who has a good cam recommendation for a 572 with indy 345 cnc 2.25 intake 181 exhaust heads. Indy tunnel ram with to alky 750 carbs. 14.1 compression with diamond flat tops. 4.500 bore 4.500 stroke. I have a set of 1.5 t&d or 1.6 T&D rockers i can use.
Race only setup in a dragster weighing 1955lbs with a 4.30 gear and 33.5 x16x16 tire.
Thanks in advance Put shear plates under the carbs. Put a 1/2" spacer on the whole plenum, if it's the newer-style T/R you could make the spacer .75" thick. Use your 1.6 rockers on the intake side of current cam.
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Re: 572 cam recommendation
[Re: 301v]
#2536545
08/15/18 12:58 AM
08/15/18 12:58 AM
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Joined: Jan 2003
Posts: 4,203 Shelby Twp. Mi
HardcoreB
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With 1.5 rockers it is
Intake lift 700 ... Lobe 4668 Exhaust lift 715 ... Lobe 4765
@50 Intake 286 and 109 ATDC @50 Exhaust 306 and 115 BTDC
Advertised Duration 326 intake and 356 exhaust I'm assuming it is a single shaft system? I just went thru some old notes on a TD system with a 1.6 ratio (1.52 pivot). Measuring a .4765" lobe with .020 lash on a 760lb spring open load my NET lift was .735" FWIW I'd guess your current NET is near .670" with the 1.5 rocker.
Last edited by HardcoreB; 08/15/18 01:02 AM.
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Re: 572 cam recommendation
[Re: 301v]
#2536609
08/15/18 09:17 AM
08/15/18 09:17 AM
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Joined: Jan 2003
Posts: 10,081 Frostbitefalls MN (Rocky&Bullw...
gregsdart
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Ask around about those K motion springs. I had k1000h springs and broke a number of them in succsession . i am not sure about the 950s, but guess you might need more spring. I picked up a bunch just going to a comp 947, which had another 90 lb of seat pressure.
8.582, 160.18 mph best, 2905 lbs 549, indy 572-13, alky
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Re: 572 cam recommendation
[Re: 301v]
#2536962
08/15/18 11:58 PM
08/15/18 11:58 PM
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Joined: Jan 2003
Posts: 10,081 Frostbitefalls MN (Rocky&Bullw...
gregsdart
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In my case the k1000h were 225 on the seat, and the cam card called for that much, yet the car responded with almost a tenth gain in ET in the 1/8th! There is a whole lot more to picking the right spring than installed seat pressure, open presure, and coilbind. Spring frequency is VERY important, along with total mass. I am no expert for sure, but just want this information available to you so you can research it, and get the most out of your motor. Dwayne Porter is one of the guys to talk to. He has dynoed a lot of motors, and has a lot of experiance in this area
8.582, 160.18 mph best, 2905 lbs 549, indy 572-13, alky
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Re: 572 cam recommendation
[Re: 301v]
#2537078
08/16/18 10:58 AM
08/16/18 10:58 AM
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Joined: Jan 2003
Posts: 14,531 So. Burlington, Vt.
fast68plymouth
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I Live Here
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As I’m sure Greg can attest......... you can spend a lot of $$$ when you’re where you are to find a tenth or two.
My biggest gripe with the k-950’s is they don’t seem to hold up very well when the valve action starts getting quicker. There are also plenty of people who have had surge problems and breakage issues using those springs, so I generally just use something else.
As for the cam, I don’t really like all that seat timing for the .050 duration and lobe lift. I don’t think it would be too hard to improve on that cam......but just how much it would improve is the question mark.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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