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Help with Cam selection (again) |
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AMXrated 
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Joined: Jul/26/2015 Location: Indiana Status: Offline Points: 290 |
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 Posted: Oct/07/2018 at 9:56pm |
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Thanks for the suggestions.
I filled out online forms for both Howards and Bullet so we will see what they have to say.
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You can have my Hurst shifter when you pry it from my cold dead hand.
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AMXrated
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Joined: Jul/26/2015 Location: Indiana Status: Offline Points: 290 |
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Posted: Oct/07/2018 at 10:00pm |
I'm not very familiar with solid lifter cams (or any type of cam for that matter...) but I thought they are better for higher RPM ranges. Why do you think it would be good in my application? Thanks, Jack
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You can have my Hurst shifter when you pry it from my cold dead hand.
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PHAT69AMX
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Joined: Jul/07/2007 Location: West Virginia Status: Offline Points: 5918 |
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Posted: Oct/08/2018 at 10:58am |
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There are many choices so it's just an opinion, to get the "definitely not stock" idle sound,
use a solid lifter cam that is for higher rpms and will get "the sound" and it will also run at higher rpms if and when it is decided to do so, just an opinion... Yes lash needs checked and adjusted occasionally with Mechanical cams, but with a "hobby car" that is less frequent since they get "few" miles put on them, relatively. My car was a street car hobby car, it had a cam for rpms beyond 5500, spec was maybe 6500, and I really like that when I did go to make 1/4 mile passes, it pulled through the traps in "D" and it did not bother me at all otherwise while street driving. Then "freshened" the engine, changed cam to a "smaller" lower rpm cam and afterward it was very aggravating the few times I went to the track and it fell on it's face at 5200.... and no real difference with normal street driving...
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67 Marlin
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Joined: Feb/21/2015 Location: Minnesota Status: Offline Points: 877 |
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Posted: Oct/08/2018 at 1:00pm |
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It would be cool if there was a sticky thread where people could put 10 second videos of their idle and which cam they had in their set up, brief build info, etc. To more fully contribute to this question, I would say to call Mike Jones and see if he can grind something to your liking.
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PHAT69AMX
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Joined: Jul/07/2007 Location: West Virginia Status: Offline Points: 5918 |
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Posted: Oct/08/2018 at 1:33pm |
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My burnout video with the link in my signature block is with the "smaller" lower RPM cam,
an Elgin Super Stock E1041P , specs were: 218 deg dur at .050", 2,000 to 4,800 RPM Range. The old cam, hydraulic, I have no video of sadly, and it sounded a lot "cooler" and it had 227 / 246 deg dur at .050", .512" / .529" at Valve... and was a lot more fun, to me anyways...
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Red Devil
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Joined: Jul/10/2007 Location: Canada Status: Offline Points: 1743 |
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Posted: Oct/08/2018 at 2:38pm |
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Main reasons I like a mechanical lifter cam for a seldom-driven street car:
- no lifter bleed down, so no start-up rattle (other than the soft clickity-clack with standard lash) - can run a more aggressive cam since seat duration is less as valve doesn't start to move until it takes up lash - may have better metering of oil to top end (depending on lifter) - better higher rpm lifter stability - sounds cool ... but not sure who's making good solid flat tappets or solid rollers these days and not many off-the-shelf cams? Hope this helps,RD
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AMXrated
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Joined: Jul/26/2015 Location: Indiana Status: Offline Points: 290 |
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Posted: Oct/09/2018 at 9:35am |
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Heard back from Howards and Bullet. Here is what they are suggesting in a custom cam:
Howards: .523/.520 valve lift 225/235 @ .050 279/289 advertised duration 112 lobe separation 108 intake centerline Bullet: Intake 236 @.050 .350” lobe lift, .560” with 1.6 rocker 283 duration @.006” Exhaust 244 @.050 .350” lobe lift, .560” with 1.6 rocker 294 duration @.006” 112 lobe separation 108 intake centerline IO 10 IC 46 EO 58 EC 6 Anyone have any thoughts on those recommendations? Thanks. |
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You can have my Hurst shifter when you pry it from my cold dead hand.
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Trader
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Joined: May/15/2018 Location: Ontario Status: Offline Points: 6876 |
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Posted: Oct/09/2018 at 11:20am |
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My first thoughts are what is the projected RPM range of these profiles?
A total guess would be 2000+ to 5800+ and you will not have much low end street torque. Of the 2 the Howards looks more streetable.
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67 Marlin
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Posted: Oct/09/2018 at 11:21am |
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Those sound like pretty big cams for low to mid range power, which is what you said you were looking for. Did they say where the peak HP would be? I'd guess around 6K if those .050 numbers aren't exaggerated for appearance purposes. But heck, if you have a four-speed and gears, you can always rev the thing up at low speeds and scorch the tires that way, especially with a lighter car. Whichever way you go, I'm sure you're going to end up grinning like a righteous idiot every time you touch the gas pedal!
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AMXrated
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Joined: Jul/26/2015 Location: Indiana Status: Offline Points: 290 |
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Posted: Oct/09/2018 at 11:42am |
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They seemed like pretty big cams to me as well compared to what I've been looking at. I gave them the exact specs listed in my original post and noted that I wanted low to mid RPM power. I think my build specs probably lean more toward high RPM use so maybe they were just trying to optimize that.
I'm going to reply to them and ask what RPM range they are targeting. Thanks.
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You can have my Hurst shifter when you pry it from my cold dead hand.
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PHAT69AMX wrote: