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Engine/Tuning
Crower Cams. FML.
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<blockquote data-quote="rich5150" data-source="post: 9654304" data-attributes="member: 33227"><p><span style="color: Yellow">I don't think you understand what I've measured. The cams WERE installed correctly by me....using a wheel and dial indicator.The BASE CIRCLE OF THE CAM WAS INCORRECT. THE CAMS WERE GROUND WRONG.</span></p><p></p><p>Here is an exerpt from John Mihovetz.</p><p><span style="font-size: 9px"></span></p><p><span style="font-size: 9px">This is my recent experiences with Crower cams and Modular engines.........</span></p><p><span style="font-size: 9px"></span></p><p><span style="font-size: 9px">What I came to find out was what I had speculated, the camshafts just simply were not correct, meaning base circle runout and lobe surface quality..........</span></p><p><span style="font-size: 9px"></span></p><p><span style="font-size: 9px">Those cams had 3 lobes total out of 32 that I felt were acceptable.<span style="color: Red"> Most lobes had runout of .0016-.002 and the worst ones .0028. What that means in simple terms is the valve never closes, and with a rocker ratio of 1.81 as a mulitplier the valve is actually off the seat as much as .005 . Impossible to tune, impossible to pass emissions and impossible to make good power much less maximum power.</span></span></p><p><span style="font-size: 9px"></span></p><p><span style="font-size: 9px">........ I am suggesting that if you suffer from the similar running condition as I have described above and have their cams, now you know what to look for. If you choose to purchase their cams, then simply just inspect every lobe as I have described and as long as it meets the maximum runout I have listed with no flat spots or dents, then by all means, run them because they will work. Also use a micrometer and measure the cam journals (all of them) and make sure they are right too. If you don't have the tools, then buy them, borrow them, whatever. IT IS THAT IMPORTANT.</span></p><p><span style="font-size: 9px">.............</span></p><p><span style="font-size: 9px"></span></p><p><span style="font-size: 9px"></span></p><p><span style="font-size: 9px">John Mihovetz</span></p><p><span style="font-size: 9px"></span></p><p></p><p></p><p>You'll have a static-compression loss due to overlap..etc how much air your moving at whatever RPM you have during a compression test obviously, what I've tried to explain was that the cam, being ground wrong, won't let the valves close all the way, the cylinder NEVER fills with a complete charge of air/fuel, thus not making the power it should.</p><p></p><p>I had the identical cam grind in my 03 cobra, the cams were dropped in, they cams were 108/110 on opposite banks, not enough to need adjustable cam gears.. the car made 640 at the tires @ 14psi with a KB on it. </p><p></p><p>The cams in chads car were made wrong. :bash:</p></blockquote><p></p>
[QUOTE="rich5150, post: 9654304, member: 33227"] [COLOR="Yellow"]I don't think you understand what I've measured. The cams WERE installed correctly by me....using a wheel and dial indicator.The BASE CIRCLE OF THE CAM WAS INCORRECT. THE CAMS WERE GROUND WRONG.[/COLOR] Here is an exerpt from John Mihovetz. [SIZE="1"] This is my recent experiences with Crower cams and Modular engines......... What I came to find out was what I had speculated, the camshafts just simply were not correct, meaning base circle runout and lobe surface quality.......... Those cams had 3 lobes total out of 32 that I felt were acceptable.[COLOR="Red"] Most lobes had runout of .0016-.002 and the worst ones .0028. What that means in simple terms is the valve never closes, and with a rocker ratio of 1.81 as a mulitplier the valve is actually off the seat as much as .005 . Impossible to tune, impossible to pass emissions and impossible to make good power much less maximum power.[/COLOR] ........ I am suggesting that if you suffer from the similar running condition as I have described above and have their cams, now you know what to look for. If you choose to purchase their cams, then simply just inspect every lobe as I have described and as long as it meets the maximum runout I have listed with no flat spots or dents, then by all means, run them because they will work. Also use a micrometer and measure the cam journals (all of them) and make sure they are right too. If you don't have the tools, then buy them, borrow them, whatever. IT IS THAT IMPORTANT. ............. John Mihovetz [/SIZE] You'll have a static-compression loss due to overlap..etc how much air your moving at whatever RPM you have during a compression test obviously, what I've tried to explain was that the cam, being ground wrong, won't let the valves close all the way, the cylinder NEVER fills with a complete charge of air/fuel, thus not making the power it should. I had the identical cam grind in my 03 cobra, the cams were dropped in, they cams were 108/110 on opposite banks, not enough to need adjustable cam gears.. the car made 640 at the tires @ 14psi with a KB on it. The cams in chads car were made wrong. :bash: [/QUOTE]
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