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Weber aficionados!!!
I'm contemplating strapping the ole' 48 IDA's to the side oiler but really love the cam that's in it. Are any of you Weber guys running high duration cams (somebody was but I can't put my finger on them) or split duration profiles? The cam in there now is a Crower 16332 which is .591 lift with .255 IN @ .50 & .260 EX @ .50 lift and wonder if this could work!/? Anybody with cams outside the suggested range (typically .240's @ .50) - I want to hear from you and your impressions! Second, this is a real lopey cam and was wondering if the Webers will seriously affect the idle/lope drastically? Thanks fellow Webers runners!!!
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In reference to using Webers, the higher the duration then the greater that the lobe centerline that the camshaft must ground on. Where the camshaft ends up being installed in relation to the intake lobe centerline (advanced or retarded) is also a key player. Reversion back through the Webers becomes critical due to the carbs sitting on top of the intake valves and lobe centerline is the controlling factor over the overlap cycle that affects this. For this reason, lobe centerline angle is quite important.
On my own ride, the difference between 108° and 114° lobe centers was over half a second in quarter mile et with the Webers. The reversion on the 108° lobe centerline cam was quite obvious as the cloud of fuel coming up out of the Webers and then being pulled back down on initial acceleration was more than noticable. |
My camshaft is 248@.050 and .605 lift. It is borderline.
As Ted stated the ammount of overlap at .050 is the key. My camshaft is on a 110 center and has 28deg. of overlap @.050 with the valves lashed at .022. I have opened the lash up to .028 to help a little. More compression will also assist in "consuming" some duration but not alot. I am going to make it through the summer and have a new cam custom ground in the fall. Brent |
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