In article <1136446378.244517.198950@z14g2000cwz.googlegroups.com>,
<"keller428@hotmail.com"> wrote:
> You will need 91 octane (preferably 93) gasoline and a mixture of
> octane booster/lead subsitiute-TEL additive or a mixture of 91/93
> premium unleaded and 108 race gas, your choice. Anything less can lead
> to scuffed cylinder walls (or worse).
>
> I run an (now old) hydraulic Crower 297HDP in my SCJ. .588/.588
> 236/244 duration @.050" lift.There is no passing it off as a stocker
> and has plenty of the "hamburger stand" idle characteristics and BARELY
> enough idle for the brakes. As StuK can attest the cam works well BUT
> the motor is a little over cammed and I'm giving up much low-end torque
> for an extended RPM range. (6500RPM). I recently put the stock exhaust
> manifolds and h-pipe on the car. It basically castrated the motor with
> this cam. I'll be swapping out cams later this year.
>
> Like CJ recommends, the stock CJ cam is OK but its not quite enough
> for the 428. Pick something hotter than a stocker but not quite as
> lumpy as mine and you'll be fine. Comp Cams 265DEH is getting good
> reviews over on the FE truck forums...but its a trucky cam. The 275DEH
> would work well too if you want an aggresive idle. We've put in the
> Comp Cams Extreme Energy XE262H on a CJ build that worked very well
> with manifolds and stock exhaust system...but not with pump gas. The
> next step up (XE 274H) would be helpful in bleeding off some cylinder
> pressure at low RPM.
>
> ANY CAMSHAFT WITH OVER .500" LIFT IN ANY FE NEEDS 427 TYPE ADJUSTABLE
> ROCKER ARMS. PERIOD. The idiots on the tech lines will tell you that
> your good to .530". Don't do it.
>
> Check out this link and the Cam Doctor analysis of an original (albeit
> worn) CJ cam.
>
> http://www.428cobrajet.org/id-cam.html
>
> A word about compression ratios. I have TRW L2445's in my motor. (OK,
> the secret is out) They're a 10.1:1 PI slug that drops the compression
> slightly compared to the CJ pistons. With 72cc chambers, the pistons
> about .015" down the hole and a modern composite head gasket my actual
> compression ratio is 9.91:1. My motor with its reduced compression and
> way too F'n big cam will BARELY run on pump premium with octane
> booster. If you mix 5 gallons of leaded 108 RM/2 race fuel its
> perfectly happy.
>
> That being said, the ONLY pump gas concoction I can get my car to run
> on is a mxture of Castle Products ZOOM octane booster and Real-Lead (or
> CD-2) Lead additive with a full tank of 93 premium umleaded. I've tried
> them all over the past 17 years.
Hey, Mikey, how much carbon ya tink ya gots on them pistons?
>
> I could deck the block and bring the pistons to zero deck which should
> help with detonation. Swain technology is also local here and I could
> have the piston tops, chambers and valve heads coated which may also
> help with the problem as well.....untill then I just keep feeding it
> the best gas I can get and doctor it accordingly. I'd love to see some
> of these 10:1 plus, iron headed FE's run on todays unleaded, oxygenated
> pump premium alone. I have yet to see one that gets away with it
> without long term problems.
>
> Good luck with it.
>
> -Mike.
>
--
Spokesmodel for Arrogant Bastard Ale
