idle quality with cam in 406 - Team Camaro Tech
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post #1 of 11 (permalink) Old Mar 13th, 03, 09:37 PM Thread Starter
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Hey guys, I was wondering how my car will sound...example stock or lumpy idle etc with this cam:

Speed pro hydraulic cam 220/230 deg duration @.05; .468/.480 lift 2200-5700rpm; 110 deg LSA; Part # CS 106 2R

I bought this engine a while back and getting it ready for my 69 camaro. This engine also has 9.5 to 1 compression and vortec heads with performer intake and 750 edelbrock and 3:73 gears
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post #2 of 11 (permalink) Old Mar 14th, 03, 06:31 AM
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A 406 is gonna swallow that cam up! It oughta idle like your dad's Oldsmobile! (well, almost!)
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post #3 of 11 (permalink) Old Mar 14th, 03, 06:46 AM
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You mean the W30 my Dad used to drive?

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post #4 of 11 (permalink) Old Mar 14th, 03, 07:06 AM Thread Starter
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Well I have it on an engine stand right now...I was wondering how big a cam should be in there to give some more HP without sacrificing too much low torque to give it more of a mean idle considering my combination. I am rebuilding my tranny and stall is no problem to get.
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post #5 of 11 (permalink) Old Mar 14th, 03, 09:09 AM
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There was an interesting magazine article awhile back about a 406 that used some Dart Iron Eagle heads (200cc?) and they were playing around with cam selection...

They tried Comp's XE274 (230/236 @.050'') and then the XE284. Not surprisingly the 284 picked up some power up top, reaching about 450 horses. However, it didn't lose much down low and still made 500 ft. lbs. torque.

I guess the point is, the added cubes of the 400 mean you can run a pretty healthy cam and still have decent idle quality. I would personally go with something in the upper 230* range.

John

- '68 Chevy Camaro (sort of done, but always subject to improvement)
- '63 Pontiac Tempest (work in progress)
- '72 Datsun 240-Z (back-burner for now)
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post #6 of 11 (permalink) Old Mar 14th, 03, 10:06 AM Thread Starter
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What is the duration of the 284XE? If i did get that cam or another, I would want to get the lifters and springs to go with it? Is that all I need or would my crane springs that I have for my other cam work too. Finally would I have to do any machine work to my vortec heads to get spings that would accompany the bigger cam?

Thanks for the replies guys
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post #7 of 11 (permalink) Old Mar 14th, 03, 10:41 AM
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powerplay, check these out

http://www.compcams.com/information/...ts/DynoSheets/

Robert

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355ci 10:1, 64cc Edelbrocks, Comp Mag 280H, Performer RPM, 700r4 (2000 stall), 3.55 posi A/C PS PDB Hotchkis

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369ci 10.3:1, 64cc Edelbrocks, Voodoo 276/284, Performer RPM, Holley 650DP ...T56 Magnum, 3.73 Moser 12 bolt
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post #8 of 11 (permalink) Old Mar 14th, 03, 10:51 AM Thread Starter
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Would my vortec heads need to be machined for the spring? Would the 284XE be good with my combo (listed in my first post)?
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post #9 of 11 (permalink) Old Mar 15th, 03, 01:47 PM
 
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Yes, vortecs will need to be watched for lift.

AND this means matching the machining operation that cuts both the spring pocket O.D. and I.D. as well as the guide height so that the retainer and valve seal fits OK at max. lift and such!!!

pdq67

PS., my average 9.5 to 1 CR. 406 SB with just double-hump heads, headers, M-20, 3.31's and about 26.5" tall tires did not run well at all until above 2500 or so rpm SO please match these to whatever cam you choose to run or you may find that it is a pain!!

Oh, my cam was a cheap RV, hydraulic type, 280/230, .480" lift jobber!!!



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post #10 of 11 (permalink) Old Mar 15th, 03, 08:40 PM
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9.5:1 compression might be just a tad low for the XE284. Also, if this is going to be a driver, the 284 won't pull enough vacuum for power accessories. I don't know about machining the Vortecs for the springs, but have heard that this does often need to be done. Duration on the XE284 is 240/246 and lift is right around 1/2'' lift.

John

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- '63 Pontiac Tempest (work in progress)
- '72 Datsun 240-Z (back-burner for now)
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post #11 of 11 (permalink) Old Mar 16th, 03, 01:13 PM
 
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I have about the same combo as pdq's in my '79 T/A- fresh 406sbc, 9.11:1 comp, ported dbl. humps (2.02, 1.60), RPM intake, 3.42 posi, 2500 stall etc. I went with the XE274 cam and love it!! It has a great idle and pulls enough vacuum for p/b's. My 406 makes gobs of low end torque as well as plenty of mid range and top end. I HIGHLY recommend the XE274!

[img]graemlins/beers.gif[/img]
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