318>390 Stroker.......Your thoughts
I run it on UK 99Ron fuel which is different to US rating. Think my fuel is above US 91.
I've been over this gas thing with a few of UK guys.
As far as I/we can tell, the gas is pretty much the same, the ratings are just arrived at from a different calculation. Check it out.
Here in Canada, they add the two ratings and divide by 2 to get the average. They call it
(R+M)/2
>Rumble in post 15 makes some very strong points. I agree with his points that argue for raising the pressure; which,he addresses well.
If your short block is already assembled and the cam is in your possession, I get that you are sorta between a rock and a hard place.
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My story;
>With alloy heads, I have not been able to find detonation, even at up to 195psi, on our 87E10, which everyone loves to avoid. My 367 now has well over 100,000 miles on it, has never run on anything other than 87E10, and has never pumped less than ~180psi on my gauge, Which the Wallace predicted to be 177psi.(sorta pointing to the accuracy of the calculator, IMO)
>Both times that I have called Hughes, they have recommended one of their cams that I felt was one or more sizes too big for my combo. I have always been happy with the smaller cams I chose, in fact, the happiest my engine has been, is with a cam that wasn't even on their radar.
>The biggest cam that I have run was the Mopar 292/292/108hydro, which IIRC was about
[email protected] .. I only ran it for one summer, because it very quickly became obvious that it was just too big for my application. I ran that cam in my Eddie-headed 367/A833/3.55s, at 11.3Scr. It did not like those 3.55s one bit. And I did not want to run more gear.
>I replaced that cam with a
Hughes HE2430AL which is 223/230, and I measured it at 270/276/110 advertized. This combo made a freight train of torque, but obviously lost some peak power. However, with 3.55s, I only pass thru the power peak once, on the way to the speed-limit, and the tires were always on fire the whole way. So for me, I lost no street-performance, gained a huge increase in low-rpm performance, and the driveability and gas-mileage increased dramatically.
With the 292 cam, had made the common mistake of chasing a power number.
>I would still to this day, have been happy to drive that little Hughes cam, except in the Fourth year it dropped lobes right after an oil-change, due to the loss of zinc. I replaced it with next-bigger cam, the
Hughes HE3037AL, also a hydro, but now 276/286/110.. I have had to live with that cam-choice since 2004, cuz it just won't die. Yes it makes more power, but I cannot feel it on the street, cuz at WOT, the 295BFGs just never stop spinning. With 3.55s, 6000 is 71mph in Second, and 7000 is 82 mph. Well it would be if the tires weren't spinning. Both of these cams used to bust the tires loose at 45 to 50 mph, with just a stomp on the go-pedal; 50 with 3.55s is ~4200 rpm in Second gear with the A833.
What I haven't mentioned is that with each of these cams, I adjusted the Scr to maintain about 180psi CCP.
>The point of my story is this: Don't let chasing a power number, ruin your street-fun. On the street, with spinning tires, 300 hp is IMO, just as much fun as 350/400; and the bottom-end is invariably more fun. Crank up the pressure and let the power be whatever it will be.
>"If your short block is already assembled and the cam is in your possession, I get that you are sorta between a rock and a hard place"
But If it was mine to do, I would shelf that cam, and install whatever it takes to get the pressure up to 180 or more. Those Eddies are gonna stretch your usable rpm band out to 6500Plus in the lower gears, and even tho the power will be down, the tires will be on fire, so yur never gonna know it. You won't perceive a power-deficit until the engine has to buck wind, sometime after maybe 80 mph. With a Mopar auto, and 3.55s, 80mph will be around 5600 @10% slip, and she still has more Second gear left in her.
>People say I put too much emphasis on pressure.
Maybe that's true IDK, but my chit boogies pretty good. My Street 367/A833/3.55s Barracuda went 93mph in the Eighth@3457 pounds with that stinking 230* cam, and 180psi. I only ever completed the one run, so IDK, it mighta had more in it.
I'm never going back to 155/160 psi.............
>
with an automatic; Your other option is a hi-stall TC to get your rpm out of the soft zone, on the starting line; and smarter guys than me have already mentioned that. I'm not a fan of hi-stalls on the street. I mean the speed limits are 30 to 50 mph, and 65 on the hiway, so this is one or two gears for the bulk of the time. And even with a soft bottom end, yur only in it for at most one second! So why sacrifice the rest of your driving experience, especially when hi- pressure cures most of the problem. If the tires spin, the hi-stall, for take-off, is a waste. With a 4" arm, and decent pressure, I doubt you will need a hi-stall. Altho, I like the way my 2800 feels (different combo), it makes me smile every time it winds up.
Anyway, Rumble is snoring, so ...............
Happy HotRodding
EDIT
BTW, these are my thoughts
