different camshaft base circle
#1
different camshaft base circle
Ok cam just arrived,was using 236 248 114 solid rollor 1'' base circle. Checked new cam 224 236 114 it looked a little smaller its .9'' mad: will the .1 really mess up geometry of rockers originally perfect I set them up with the litlle plastic checker and bought the right pushrods. I don't want to buy another set unless I have to but now they are 0.10 too short should I worry
John Carpico
John Carpico
#5
Originally posted by OneFlyn95z28
Um...
..what Bret said...
Um...
..what Bret said...
jon
#6
Thanks Jon always do check, just sometimes the only way to get perfect geometry is with a custom pushrod right now using an 8'' comp cam pushrod, next step up is 8.150. So with shelf pushrods I am at least .065 to .090 to short or .085 to .060 to long if I tep up to 8.150.
The question I was asking is is this OK or should I buy custom pushrods. Most guys buy an aftermarket cam and never check the base circle, so there must be a + - to optimum.
John
The question I was asking is is this OK or should I buy custom pushrods. Most guys buy an aftermarket cam and never check the base circle, so there must be a + - to optimum.
John
#8
Originally posted by john35thss
Thanks Jon always do check, just sometimes the only way to get perfect geometry is with a custom pushrod right now using an 8'' comp cam pushrod, next step up is 8.150. So with shelf pushrods I am at least .065 to .090 to short or .085 to .060 to long if I tep up to 8.150.
The question I was asking is is this OK or should I buy custom pushrods. Most guys buy an aftermarket cam and never check the base circle, so there must be a + - to optimum.
John
Thanks Jon always do check, just sometimes the only way to get perfect geometry is with a custom pushrod right now using an 8'' comp cam pushrod, next step up is 8.150. So with shelf pushrods I am at least .065 to .090 to short or .085 to .060 to long if I tep up to 8.150.
The question I was asking is is this OK or should I buy custom pushrods. Most guys buy an aftermarket cam and never check the base circle, so there must be a + - to optimum.
John
Rich Krause
#9
I know my old combo and I was just doing math with new parts.
Guess I should have known comp would have a pushrod somewhere that would be right.
Is .09 to .065 to far off has anyone run into problems or broken anything being this far out, just didn't want to spend any more money on this short since I will probably run hyd next shortblock.
John
Guess I should have known comp would have a pushrod somewhere that would be right.
Is .09 to .065 to far off has anyone run into problems or broken anything being this far out, just didn't want to spend any more money on this short since I will probably run hyd next shortblock.
John
#10
Re: different camshaft base circle
Originally posted by john35thss
Ok cam just arrived,was using 236 248 114 solid rollor 1'' base circle. Checked new cam 224 236 114 it looked a little smaller its .9'' mad: will the .1 really mess up geometry of rockers originally perfect I set them up with the litlle plastic checker and bought the right pushrods. I don't want to buy another set unless I have to but now they are 0.10 too short should I worry
John Carpico
Ok cam just arrived,was using 236 248 114 solid rollor 1'' base circle. Checked new cam 224 236 114 it looked a little smaller its .9'' mad: will the .1 really mess up geometry of rockers originally perfect I set them up with the litlle plastic checker and bought the right pushrods. I don't want to buy another set unless I have to but now they are 0.10 too short should I worry
John Carpico
2 times (lobe lift + half the BC) would be the max "diameter" of the cam lobe. Examples:
2 (.330 + .500) = 1.660
2 (.380 + .450) = 1.660
In other words, that extra .050 lobe lift requires a .100 smaller base circle diameter.
My $.02
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09-29-2015 09:00 PM