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Confirm whether the cam is bent or not=2E Cams can be striaghtened a good c=
am grinder should be alble to straighten it=2E Then if it is still tight, po=
lish or griind the cam journals until you have the correct clearance on each=
journal=2E You want to keep the oil clearance withing specs so you don't lo=
ose oil flow volume by excess oil bleeding out the sides of the bearings cau=
sing a pressure & volume drop at the mains and rods=2E=20
Greg Solow
The Engine Room
Sports Car Specialists
Santa Cruz, CA 95060
831 429-1800
------- Original Message -------
>From : Scott Janzen via Fot[mailto:fot@autox=2Eteam=2Enet]
Sent : 1/5/2015 6:40:57 PM
To : fot@autox=2Eteam=2Enet
Cc :=20
Subject : RE: [Fot] Cam Bearings expansion
I've got a bit of cam bind in a new cam I'm installing in the GT6=2E It ap=
pears to be a combination of slight run-out (i=2Ee=2E, the cam is slightly b=
ent, 1/1000 of runout in the middle), journal size right at the factory maxi=
mum spec, and installed bearing I=2ED=2E that is at or below the factory min=
imum I=2ED=2E
It's also possible that the block is not bored perfectly straight as the bin=
ding is not consistent around the rotation, but another cam I have, with jou=
rnal diameters 5/10,000 smaller, turns freely=2E I have not checked that ca=
m for run-out=2E
Question is, is there a tool to "expand" the bearings into the block and pos=
sibly gain a bit of clearance? I'm told the factory manual for one of those=
Octagon cars calls for such a tool=2E I'm using the typical Spitfire beari=
ngs=2E
Next stop is a machine shop with a crank straightening machine to see if the=
y can use it to straighten a cam=2E
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Confirm whether the cam is bent or not=2E Cams can be striaghtened a g=
ood cam grinder should be alble to straighten it=2E Then if it is still tigh=
t, polish or griind the cam journals until you have the correct clearance on=
each journal=2E You want to keep the oil clearance withing specs so you don=
't loose oil flow volume by excess oil bleeding out the sides of the bearing=
s causing a pressure & volume drop at the mains and rods=2E <br><br><br>=
Greg Solow<br>The Engine Room<br>Sports Car Specialists<br>Santa Cruz, CA 95=
060<br>831 429-1800<br><br><br><br>------- Original Message -------<br><stro=
ng>From :</strong> Scott Janzen via Fot[mailto:fot@autox=2Eteam=2Enet]<br=
><strong>Sent :</strong> 1/5/2015 6:40:57 PM<br><strong>To :</strong=
> fot@autox=2Eteam=2Enet<br><strong>Cc :</strong> <br><strong>Subject :=
</strong> RE: [Fot] Cam Bearings expansion<br><br> I've got a bit of cam bin=
d in a new cam I'm installing in the GT6=2E It appears to be a combina=
tion of slight run-out (i=2Ee=2E, the cam is slightly bent, 1/1000 of runout=
in the middle), journal size right at the factory maximum spec, and install=
ed bearing I=2ED=2E that is at or below the factory minimum I=2ED=2E<div><br=
></div><div>It's also possible that the block is not bored perfectly straigh=
t as the binding is not consistent around the rotation, but another cam I ha=
ve, with journal diameters 5/10,000 smaller, turns freely=2E I have no=
t checked that cam for run-out=2E<br><div><br></div><div>Question is, is the=
re a tool to "expand" the bearings into the block and possibly gain a bit of=
clearance? I'm told the factory manual for one of those Octagon cars =
calls for such a tool=2E I'm using the typical Spitfire bearings=2E</d=
iv><div><br></div><div>Next stop is a machine shop with a crank straightenin=
g machine to see if they can use it to straighten a cam=2E</div><div><br></d=
iv><div><br></div><div><br></div><div><br></div></div>
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