Thread: Crane 286 or 226?
18-04-2012, 11:51 AM #1
Crane 286 or 226?
Goin to use one of these cams....had a 286 in my Vk about 10 -12 years ago...L34 spec heads, port matched redline maxitork manifold ,650dp ,flat tops,turbo 350 with stage 2 shift kit,2500 stally and 3.55 gears and to me felt like a slug.......lots of noise with no go......Sounded tough as but just felt boggy to me so was reluctant to go there again but everywhere i read people harp like they are the best thing since sliced bread. This time will be a very similar setup just with a trimatic with 2500 stally,L34 heads with 1.65 YT roller rockers and a 3.7 dif or something alike as i have nine inch this time.The 2 cams seem a very similar rev range but i have read ppl saying the 226 is alot more torquey.....just after any input....
Last edited by MudPlow; 18-04-2012 at 11:53 AM.
18-04-2012, 12:49 PM #2
To run a big cam you need compression - just fitting flat tops with standard decks won't cut it !
Then if you want it punchy off the line to need to run as much initial timing as the combo can handle without pinging - this will sharpen up the bottom end and also give you decent vacuum !
For instance - my 355 with 10.8 to 1 comp and a solid cam similar to the 280 ran 24 deg initial and 34 deg total timing and no vac advance.
The final tune should be done on a dyno simply because it saves you days of stuffing around guessing !
18-04-2012, 12:49 PM #3
what's your compression ratio? 2500 stall ain't muchI love Prius drivers cause I need their share of the fuel supply!
18-04-2012, 01:17 PM #4
in my vk it was 10.1 comp and i always adv the timing till its a little hard to crank over and doesnt ping....I just leave the dizzy so i can move it back or forward if i need and just move it bit by bit till it stops pinging.....I also never run vac advance....And for this engine not sure what comp it is as i didnt build it i was just told it had wayne gardner racing pistons in it ...whatever they are lol....and as far as the stally goes i thought you really only need to stall up to the beginning of the cam rev range...eg 2500-6500 but again do correct me if i am wrong lol.....when i looked at the car i did a comp test and got 150 in all 8 cyl which i thought was pretty high...
18-04-2012, 03:14 PM #5
10.5 and 3000 stall for the 286 minimum.
the 286 is a Chev grind i believe, it works but theres better grinds out there.
18-04-2012, 06:33 PM #6
18-04-2012, 06:34 PM #7
150psi is not enough compression, esp for a 308 with a 226 or 286 cam
18-04-2012, 06:37 PM #8
What you need to do is have your car dyno tuned to the best total timing for that engine combo - then you shorten the advance curve so your initial timing is higher without pinging or increasing the total timing !
This is because a stock dizzy has a timing curve that's too long so you may get close to the right total timing by your method but but your initial timing will still be too retarded to give your engine the snap its supposed to have - like i said before, my dizzy runs from 24 initial to 34 total so that's 10 degree's of mechanical advance.
A stock dizzy has around 25 degree's of mechanical advance - Capish ?
You can read my post on how to graph you own dizzy for a more detailed explanation
Last edited by Mickss355; 18-04-2012 at 06:47 PM.
18-04-2012, 06:53 PM #9
Cylinder pressure is TORQUE, you can have it high or low whatever you want but if it aint there your engine will be a soggy pile of crap ...
Low cylinder pressure by overcamming, low static compression ratio results will be average at best ...
18-04-2012, 07:31 PM #10
And what is it with these engine builders that won't recommend or fit flat tops in 308's and especially 355's ?
I had a hell of a time with my engine builder over it - in the end I simply said " mate, I know you've got some decent runs on the board but, not gunna happen" hahahaha
Last edited by Mickss355; 18-04-2012 at 07:33 PM.
18-04-2012, 07:43 PM #11
SO would a scorcher dizzy out of the box need recurving? Again it was on the motor not sure if its been recurved or what, also what compession should i be running in a 308 then? most people i have spoken to and threads i have read have all ranged from 130 - 175,180.Next question is what should i do now to boost the compression then? Without pulling the bottom end apart
Last edited by MudPlow; 18-04-2012 at 07:50 PM.
18-04-2012, 07:46 PM #12
18-04-2012, 08:00 PM #13
18-04-2012, 08:09 PM #14
As for what comp ratio you need - well that would depend on the cam you want to use.
I've run 11 to 1 on the street in a 308 with a cam similar to the crane 280 solid cam and the thing was as sharp as a razor - with 2800 stall, jazzed up trimatic and 3.5 to 1 9 inch, it made 235 rwhp with L34 heads ported and revved to 7000 all day long and the inlet manifold wasn't even a TP - it was just a crappy old Redline Maxitork i had just laying around and thought "yeh that'll do"
18-04-2012, 08:13 PM #15
mick have you got more specs on your engine to achieve 10.8 compdefinition of expert. Ex is an unknown quantity, spert is a drip under pressure, Which one are you
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