Solid Roller Cam Selection Help.

[ghittner]

After speaking with most of the major cam manufacturers, I've come up with two grinds what I feel are close to what I need for this motor. I'd appreciate input from you folks who have experince with this type combo. Thanks.
@50 @50
Gross Lift Int. Exh. Dur-Int. Dur.-Exh. Centerline
Isky: .650 .654 282 288 112
Crower: .707 .700 270 278 112
The application is a 500 CI 8:1 Static Comp. non intercooled blower motor, 8 pds boost. 350 cc runner Canfield Aluminum Heads. Stainless Marine Exhaust 4" wet and no mufflers. The exhaust drops 14" b-4 water enters the exhaust stream so I don't feel reversion will be an issue. 4000-4500 Pd boat that needs to still pull skiers, haul ass at river and travel in ocean 35 miles out or so and back reliably. Thanks for input folks.....

[Liberator TJ1984]

haul ass at river and travel in ocean 35 miles out or so and back reliably.
You ain't askin' for much are ya :idea: :D

[cstraub]

Is this a Jet or V-drive? If this is an I/O and those are .050" numbers then it is WAY over cammed with either of those....

[ghittner]

This is an I/O Bravo 1

[ghittner]

Is this a Jet or V-drive? If this is an I/O and those are .050" numbers then it is WAY over cammed with either of those....
Please explain further. Thanks.

[Roaddogg 4040]

Chris is the cam man.... He should have some pretty good ideas...
Steve

[hotbo]

well i think you need to get your .050 down to around 250s or 260 and keep lift as high as possible lift creates torque:D keep the 112 lobe sep and you should be alright:) like chris said thats way over board on the .050 numbers:idea: good luck and call chris he can make that thing run like ya want:D

[WETTE VETTE]

Those cams are too big. If you have very detailed info on head flow numbers as well as exhaust system details a custom grind from someone will be a good choice. Or you could use a cam that Nickerson Performance uses in a lot of 500" blown marine engines. It typically makes very good power and is easy on parts for durability. The specs are 252/258 @ .050" on 114 LSA installed on 110 ICL with .680"/.708" lifts with approx .020" lash. Peak RPM will likely be in the 5700 RPM range, but anything from 5500 to 6200 will be OK.
Craig

[ghittner]

Thanks a bunch for the info, it seems that the duration is the main difference with the lifts somewhat the same. The centerline I prefer is 12 Deg. If I'm looking for a taller redline (6500) maybe the Crower is OK? I'm spinning an Eagle steel assembly.

[MACHINEHEAD]

I would stay in the 250 range for sure. I would like to see low lift considering your high milage reliability issue. And something soft on the seat duration so it is "easy on your parts". Comp has their one and only shelf grind "blower" cam. 255/262 @.05 300/308 on the seat, and a easy .652 lift on a 114 LDA. This would be my choice considering all things on your combo and should be able to push past 850 horse at 5500 no problem with the Canfields.

[ghittner]

After speaking with most of the major cam manufacturers, I've come up with two grinds what I feel are close to what I need for this motor. I'd appreciate input from you folks who have experince with this type combo. Thanks.
@50 @50
Gross Lift Int. Exh. Dur-Int. Dur.-Exh. Centerline
Isky: .650 .654 282 288 112
Crower: .707 .700 270 278 112
The application is a 500 CI 8:1 Static Comp. non intercooled blower motor, 8 pds boost. 350 cc runner Canfield Aluminum Heads. Stainless Marine Exhaust 4" wet and no mufflers. The exhaust drops 14" b-4 water enters the exhaust stream so I don't feel reversion will be an issue. 4000-4500 Pd boat that needs to still pull skiers, haul ass at river and travel in ocean 35 miles out or so and back reliably. Thanks for input folks.....I talked with Dave Crower and gave him the specs for the canfield flow #'s, he changed his specs on the design to the following:
@50 @50
Gross Lift Int. Exh. Dur-Int. Dur.-Exh. Centerline
Isky: .650 .654 282 288 112
Crower: .694 .723 267 276 112
Crower Adv- 299 310
Input.....................?
Also, he wants to change the firing order for a 4,7,3,2 switch.
What about that also?

[cstraub]

You've got a 350cc intake port with a blower filling a 500CID engine with a peak of around 6000 rpm. . . .the camshaft doesn't need any time (duration) to fill the cylinder do to the fact the volume of air pontential that the heads and blower have. So a cam with short duration and moderate lift will be best suited.

[ghittner]

Just got off the phone with Teague....... That is THE LAST CALL I WILL EVER MAKE TO THEM!!!!! What a co88cky bunch of SOB's! If you aren't building something over 650 CI they have NO time for you to sell you parts or otherwise. They only sell "premium engine stuff" OHHHH, so sorry to call!!!! Oh yeah, apparently I'm a "car guy" and according to this parts guy, and don't understand the performance boating market! I've only been building and rigging my own boats for 20 years! Unbelievable!

[BlownBaker]

Been doing this for a little while, so here is my humble opinion. The cam companys will spec a max HP cam. That's thier job. Seems an outdrive needs a decently low idle to get in gear. The 270/280 numbers will keep the idle high and I would not recomend those. Someone already suggested a mid 250 duration cam and I would agree. If the engine runs below 6000, big cams won't help enough to make up for the high idle and valve train maintance. A 112 or 114 would both work, however a 114 would idle better (and ultimatly,lower). I run a 580CID, 12-71 innercooled BBC in my Baker and have run a variety of cams. Mine likes 280. But I have no gears to wory about. I have run as much as 118 LSA on my 650CID NOS drag motor. Bigger engines and higher RPMs like less overlap, more lobe separation. Hope you get thru this quickly as summer is fading quickly!

[ghittner]

Hope you get thru this quickly as summer is fading quickly!
Ouch, yes it is! Heads and cam are on the way.....:jawdrop:

[Badburn]

Just got off the phone with Teague....... That is THE LAST CALL I WILL EVER MAKE TO THEM!!!!! What a co88cky bunch of SOB's! If you aren't building something over 650 CI they have NO time for you to sell you parts or otherwise. They only sell "premium engine stuff" OHHHH, so sorry to call!!!! Oh yeah, apparently I'm a "car guy" and according to this parts guy, and don't understand the performance boating market! I've only been building and rigging my own boats for 20 years! Unbelievable!
I got the exact same response from them when I was building my blown 515. Doubtful I will ever buy anything from them either.;)
You got some good advise here on this thread, use it.;)

[Jspeeddemon]

I have this same camshaft, 255/262 and .652/.652, mentioned earlier, in my 540 Procharger motor and it idles well and runs really well. I ran a 259/270 .675/.675 Howards racing camshaft in this motor as well and in my 548 and a 588 as well, was a very good choice for an I/O. It made 1125 HP in a 548, so power level is there if you can push the boost. Here is the link where I bought my cam. http://store.summitracing.com/egnsearch.asp?Ntk=KeywordSearch&DDS=1&Ntt=Big+Chevy+blower+cam&searchinresults=false&N=+115

[ck7684]

I have a great cam for you but the LSA is 108*

[ghittner]

I have a great cam for you but the LSA is 108*
Out of curiosity, what are the specs?

[ck7684]

Going by memory, the specs are .701 lift and about 249* @.050 with 108* LSA. Cam is an Ultradyne custom grind never removed from the box. This was going to go into a 468 for a Corvette but now the engine is going into my boat but this cam is a bit large for this build. Might work great for a blower but not sure on the LSA for wet exhaust...

[ghittner]

Runs like a bat ouuta *ell! Very happy with this Crower and as far as power down low and midrange there is gobs and gobs to spare. Not a sign of reversion......Crower: .694 .723 267 276 112 w/ the #4 & #7 swap.
Idles @ 11-1200, no surge at all and in gear it idles @ 700 or so. VERY well mannered, I'm totally happy with this grind....TOTALLY!