Solid Roller Cam Choice
07-23-2007, 09:55 PM
#21
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I'm just not sure about reversion in your case...and I am usually pretty aggressive about telling people to NOT worry about it.....I can't make that call...but that is a HUGE cam for a 500" motor and if you are thinking 112 or 110 the problem becomes worse. There are lots of reasons (some more technical than I probably know) that you should be thinking 114. (A) most blower grinds for marine are on 114...think about it, if you are forcing the air in the motor under pressure, overlap and scavenging are not as big of a deal. (B) motors with less overlap idle better.
Those are the main (2) to be thinking about. Talk with Dean Gellner, Dean Nickerson, Bob Madera, Teague, etc for all the other reasons...and their reccs... None will be even close to that big, I guarantee it....Make sure its a marine person...there is lots of knowledge at the cam companies...but most of them have little if any experience in a marine environment where wet exhaust, idle quality, etc matter....
FYI, many 502-509" motors we have built and run with (aweful) stock 500hp heads, roots blowers, utilize crane 651 hydralic roller..which is 244/[email protected] .632/.632" on 114. The idle with this cam is pretty nasty...its a big cam for a 500" motor...let alone what you are talking about running. Your heads are much better than stock and you'll need less of a cam split to "crutch" it. Peak poewr on the above set-up is 6100 rpm and that's hydralic roller.
Those are the main (2) to be thinking about. Talk with Dean Gellner, Dean Nickerson, Bob Madera, Teague, etc for all the other reasons...and their reccs... None will be even close to that big, I guarantee it....Make sure its a marine person...there is lots of knowledge at the cam companies...but most of them have little if any experience in a marine environment where wet exhaust, idle quality, etc matter....
FYI, many 502-509" motors we have built and run with (aweful) stock 500hp heads, roots blowers, utilize crane 651 hydralic roller..which is 244/[email protected] .632/.632" on 114. The idle with this cam is pretty nasty...its a big cam for a 500" motor...let alone what you are talking about running. Your heads are much better than stock and you'll need less of a cam split to "crutch" it. Peak poewr on the above set-up is 6100 rpm and that's hydralic roller.
That's real similar to the cam I'm running on my 454 mag efi with Dart 325's and a Vortech supercharger. It dynoed at 730 hp at 5600rpm with 9.8 psi. I'm propped to run at 5200 rpm at 669 hp, and my cruising hp is 510 at 4k.
Ghittner, I would be looking at no more than 630 ish lift, and I know you recently bought those heads, why didn't you go with the 315 Canfields? Your heads are huge, the cams your looking at are huge, that's no problem if you want to crank it up to 7k but your post said you want something reliable and that you can ski behind. The smaller heads will give you more low end hp and torque. The bigger heads wont show you any thing until your aboove 6k.
Maybe you looking for more than 700hp or so? If so more cubes will get there easier.
09-26-2007, 01:32 PM
#22
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All done and ran the Crower BIG cam and I couldn't be happier.... This motor grunts out of the hole like there's no tomorrow and the top end is unbeleivable. As far as idle, 1150-1200 out of gear and 650-700 in gear. Dock manners are excellent and it has way more horsepower across the full powerband than I could have imagined. Pulls tubes and skiiers all day long. Absolutely no sign of reversion. All the stuff I was afraid of with this large a cam never came true, It runs Perfect.
Crower:@ 50- Lift-.694 Lift-.723 Dur 267 Dur 276 L/C112
Crower:@ 50- Lift-.694 Lift-.723 Dur 267 Dur 276 L/C112
Last edited by ghittner; 09-26-2007 at 01:37 PM.
10-01-2011, 01:27 AM
#23
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All done and ran the Crower BIG cam and I couldn't be happier.... This motor grunts out of the hole like there's no tomorrow and the top end is unbeleivable. As far as idle, 1150-1200 out of gear and 650-700 in gear. Dock manners are excellent and it has way more horsepower across the full powerband than I could have imagined. Pulls tubes and skiiers all day long. Absolutely no sign of reversion. All the stuff I was afraid of with this large a cam never came true, It runs Perfect.
Crower:@ 50- Lift-.694 Lift-.723 Dur 267 Dur 276 L/C112
Just Wanted to udate still runnin strong Skiiers band tubers @ 1800 RPM and running up to 6800 RPM top end IDLE NO LOPE AT 1200 rpm..STILL PERFECT YEARS LATER !!!!Thank you CROWER!!!!!
Crower:@ 50- Lift-.694 Lift-.723 Dur 267 Dur 276 L/C112
Just Wanted to udate still runnin strong Skiiers band tubers @ 1800 RPM and running up to 6800 RPM top end IDLE NO LOPE AT 1200 rpm..STILL PERFECT YEARS LATER !!!!Thank you CROWER!!!!!
