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By 62galxe - 16 Years Ago
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63 f100 292 .060 overbore G heads standard trans lookin at a isky rpm-300 or mummerts 270 grind. Have read that the isky E4 is pretty mild. lookin for comments on these grinds. lookin for a cam that will still have some low end power. RPM-300/duration 270/lift .448/112 centerline mummert 270/duration 272/lift .440/centerline 108
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By Ted - 16 Years Ago
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Afraid I’ve got the Isky E4 in my 272 so can’t help you on the other two grinds. But the E4 literally boils the hides with it installed at 104° intake lobe centerline. The E4 is slightly more duration and lift than the factory ’57 cam but is ground on a 108° lobe centerline which makes for more peak torque than the factory grinds.
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By Daniel Jessup - 16 Years Ago
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Hey Ted, I remember seeing an advertisement for that grind from Isky (E4) about 10-15 years ago - maybe it was Red's? Anyway, do you know of anyone still carrying that grind?
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By PF Arcand - 16 Years Ago
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Ted; viewed all the cams listed for Y-blk by Isky. Why do they recommend such high spring pressures? The E-4 is listed as needing 135 LB on seat & 285 open with damper.. same as the 505 T. It would seems unnecessary on a cam with a range from 2000 to 5000. ??
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By kidcourier - 16 Years Ago
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Everybody seems to be running the Isky or Mummert cams,I've got a 272 y-block that has a Crane cam grind#S-264-C, any info on lift/duration and performance compared to the above type cams? KID
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By Ted - 16 Years Ago
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PF Arcand (2/24/2009)
Ted; viewed all the cams listed for Y-blk by Isky. Why do they recommend such high spring pressures? The E-4 is listed as needing 135 LB on seat & 285 open with damper.. same as the 505 T. It would seems unnecessary on a cam with a range from 2000 to 5000. ??Paul. Isky only lists one valve spring for the Y and that particular part number is also used on several other applications. My own experience is that too low a pressure is as bad if not worse than too much. Seat pressure is only a part of the overall picture as it’s the over the nose pressures that are the real detriments in regards to cam lobe and lifter wear. If installing the Isky 6005 springs at 135 lbs of seat pressure for the E4 camshaft, the over the nose pressure will be less than 250 lbs which is an easy push for the Isky cams. But have to agree that 135 lbs of seat pressure on a daily driver Y is to the extreme so just back off on the pressures either by removing the center spring or going with a taller installed spring height.
I’ve the 6005 Isky springs in my daily driver 272 and they were originally set up at 110 lbs of seat pressure and now have over nineteen years on them without any camshaft issues. The Y engine in my roadster is using the Isky 8005 springs installed at 135 lbs of seat pressure with over the nose pressures being in excess of 370 lbs with the same zero lobe or lifter issues. If the camshaft is of good quality and the oil is adequate, lobe and lifter life really isn’t much of an issue in the Y even with extreme valve spring pressures. I think Gary can chime in here and give some additional information regarding lobe rakes as that's also a valid player in camshaft life. For myself, the base circle diameter is a much bigger player as the lifter drop from the bottom of the lifter bore becomes more critical as camshaft base circles are reduced.
But I recently dynoed an engine with 200 lbs of seat pressure on the flat tappet hydraulic lifter cam and upon pulling the cam to install another cam of slightly different variation, the original looked flawless after making several pulls. And this cam had already been run and raced in the car when it arrived at the shop. But the lifters were extremely hard on their bottoms. So hard in fact that the warning with them is to make sure they always stay in contact with the lobe with absolutely no chance of bounce. Hence the high valve spring pressures for this particular camshaft.
Here are some other past threads regarding Isky valve spring pressures. http://forums.y-blocksforever.com/Topic20831-3-2.aspx http://forums.y-blocksforever.com/Topic16506-3-1.aspx
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By Ted - 16 Years Ago
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kidcourier (2/24/2009)
I've got a 272 y-block that has a Crane cam grind#S-264-C, any info on lift/duration and performance compared to the above type cams? KIDCrane S-264 Hi-Torque Road-Track-Drags Intake open/close 26-58 Exhaust open/close 72-12 Advertised duration 264° Duration at 0.050” Int/Exh 220°/220° Lift with 1.54:1 rockers Int/Exh 0.445”/0.445” Lash hot Int/Exh 0.016”/0.018” Based on the open/close specs, it’s ground on 113° lobe centers
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By 62galxe - 16 Years Ago
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thanks for the help on the original topic.
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By 62galxe - 16 Years Ago
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how does lobe centerline affect idle and low end power. say 112 versus 108.
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By kidcourier - 16 Years Ago
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Thanks for the info Ted, dug around in some paperwork and found the cam card. Listed as "mechanical special-regrind #00358--S-264-C " Intake open/close 28/64, Exhaust open/close 74/18---Advertised duration 272 degrees-- duration at 0.050 Intake/Exhaust 222/222, Lift with 1:54 rockers Intake/Exhaust 0.445/0.445 seems to be a nice streetable cam with a little lope to it at idle ! Again-- Thank You for taking the time to answer my question. KID
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By 62galxe - 16 Years Ago
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wonder if i should repost a new topic since most of the replys have nothing to do with my question.
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By pintoplumber - 16 Years Ago
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Kenny, I've got the E-4 in the 239 in the truck. For street driving, I love it. You can really feel the torque.
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By bird55 - 16 Years Ago
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Kenny, I think you have to try it out, A lot of it is personal preference and what you can tolerate for street driving. Do you have an auto?
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By bird55 - 16 Years Ago
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Ok, I just reread you original post. Since you have standard trans check with Mummert or TED as you can use more rough idle if you are up to it. I like the ISKy and best of all I like the full CAM kit lifters springs etc.
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By ejstith - 16 Years Ago
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Anybody ever use a Schneider cam?
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By Ted - 16 Years Ago
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62galxe (2/27/2009)
how does lobe centerline affect idle and low end power. say 112 versus 108.As a general rule, tightening up (making smaller) the lobe centerline makes the torque peakier or higher but the torque band itself will be within a narrower rpm range. The wider lobe centerline on a camshaft that is otherwise identiical will typically idle smoother with an increase in manifold vacuum at idle with less lope or rumble due to a reduced overlap. A camshaft with a narrower lobe centerline is more sensitive to how it’s degreed in versus a cam with a wider lobe centerline.
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By speedpro56 - 16 Years Ago
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Ted, from what I learned on the lobe rake on high lift cams was too use .002 rake to avoid fatal issues with the cam lobes and lifters.
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By pegleg - 16 Years Ago
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You might give Engle a call too, they can grind about anything on any centers and are reasonably priced. Mumert has cams and John typical knows, and will tell you what works.
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