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Author
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Topic: Which cam to use?
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kid vishus
Gearhead Posts: 6098
From: middle of NC
Registered: Oct 2000
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posted 07-25-2001 08:59 PM
   
I ordered 2 new cams for my 351C race motor.
Which one does everyone think would work best. The motor is an 11.5-1 compression,ported 4v heads, Strip Dominator intake, 926cfm alcohol carb, 1 7/8" super comp headers, 6000 rpm convertor. The roller I wiped out 3 weeks ago was 264 int, 272 exh @ .050, .650 lift on both, with a 108 centerline.
The two flat tappet cams I just ordered are:
#1: 270 int, 282 exh @ .050, .644 int, .654 exh lift 108 centerline
#2: 266 int, 277 exh @ .050, .628 int, .625 exh lift 107 centerlineSeeings how the only thing that I still do well with the car is drive it, I figure I would let someone else decide which cam would be best.
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kid vishus
Gearhead Posts: 6098
From: middle of NC
Registered: Oct 2000
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posted 07-25-2001 10:59 PM
I guess I left some info out. I run a 4:86 gear, a 32" tall tire and shifted my roller out of low at 75-7600, and out of 2nd at 7200, going thru the lights qrtr mile racing around 7500. The car now weighs just over 2900 lbs with me in and 150lbs of lead.
I had to run 1.6 ratio rockers on the intakes for valve to piston clearance.
I am leaning towards one of them right now, but figure I would wait and see what everyone else thinks first.
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70coupe
Gearhead Posts: 459
From: Toronto,Ontario,Canada
Registered: Aug 2000
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posted 07-25-2001 11:21 PM
I was talking to a Ford racing tech recently and his cam suggestion was one with around .650/.660 lift with 252/262 duration and a 109 or 110 centreline. He also recommended a company called lazer cams (I've never heard of them). My .02 cents.
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bluestreek
Gearhead Posts: 1724
From: Athens,GA
Registered: Jul 2001
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posted 07-25-2001 11:59 PM
I would bet that the first one is the fastest but the second one will be .1 -.3 sec slower but more consistent.. Depends on what your looking for..One more note.. #1 is approaching Nascar specs.. Are you sure you're ready for those rpms??? [This message has been edited by bluestreek (edited 07-26-2001).]
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Butch Jennings
Gearhead Posts: 624
From: No. California
Registered: Apr 2000
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posted 07-26-2001 12:11 AM
I'd run #2 Kid....282 @ .050 is gonna kill off what little torque that 4v headed motor's gonna make. I'd like to see a little more lift, but #2 would be my choice of the two you've got listed.------------------
Butch
460 powered 1967 Comet Cyclone
10.271 @ 130.069
Butcher's Home Page
"Friends don't let friends drive Chevys"
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Greenstang
Gearhead Posts: 908
From: its all a fog..
Registered: May 2001
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posted 07-26-2001 12:34 AM
quote:
Originally posted by 70coupe:
I was talking to a Ford racing tech recently and his cam suggestion was one with around .650/.660 lift with 252/262 duration and a 109 or 110 centreline. He also recommended a company called lazer cams (I've never heard of them). My .02 cents.
They are at http://www.lazercams.com (I think) There *is* a link off my webpage (click my name in the .sig). ------------------
Marcus
Audi R8-
The new definition of "The Unfair Advantage."
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Doc
Gearhead Posts: 466
From: Redwood City, Ca. USA
Registered: Jan 2001
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posted 07-26-2001 04:54 AM
Ultradyne has a couple of shorter duration higher lift sticks listed with a little tighter center. I think the alochol would like 268/275 682/680 on a 106 but their 260/267 657/661 on a 106 might be a bit easier on parts.
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kid vishus
Gearhead Posts: 6098
From: middle of NC
Registered: Oct 2000
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posted 07-26-2001 10:03 PM
I am going to run the second cam. I would like it to have more lift too, but I am sure I wont have clearance for it. These were cheap, $60 each, so I couldnt beat the price. They are from the Crower garage sale.
The first cam I am going to save for a long rod motor I am planning. 6.2" billet rods with lite weight flattops. Something I can turn 8500 and have faith it will stay together.
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bluestreek
Gearhead Posts: 1724
From: Athens,GA
Registered: Jul 2001
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posted 07-27-2001 03:35 AM
Here's what you need for that cam.. 
http://cgi.ebay.com/ebaymotors/aw-cgi/eBayISAPI.dll?ViewItem&item=593528089
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jkilroy
Gearhead Posts: 1808
From: Vicksburg, MS
Registered: Dec 99
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posted 07-27-2001 11:11 PM
I am no world class expert but I think you are going to need more compression with that much duration. I mean, lets face it, you aren't exactly going to the grocery store in that baby, running alcohol also, why not bump the compression up into the 12.5 to 13.5 range? ------------------
Jay Kilroy
68' Fastback GT 390
"No such thing as a cam thats too big"
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kid vishus
Gearhead Posts: 6098
From: middle of NC
Registered: Oct 2000
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posted 07-28-2001 07:45 AM
It should work ok with the compression I have. I would raise it, but the domed pistons I had for the open chamber heads "got blowed up" and I cant afford to buy new ones. Plus if I did, the heads have been milled so much, that the domes have to be hand fitted to the chamber for clearance if the block gets decked for more compression. The motor I ran last year was that way (till it broke,lack of clearance) and it was 13.85-1 compression.
This cam will have to work better than the one I just took out.
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kid vishus
Gearhead Posts: 6098
From: middle of NC
Registered: Oct 2000
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posted 07-29-2001 09:12 PM
I put cam #2 in. It sounds alot better than the old one did. Will find out next week how it runs. I was off just a touch on the cam specs,I had the duration and lift right, but the lobe seperation is 107, and the intake centerline is 103.
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