Holbert Car cam update. Two MORE teeth found after 4 race weeknds after oil change
09-15-2005, 01:56 PM
#46
Three Wheelin'
Originally Posted by mark kibort
all cams in hand!!!!!! took about 3 hours to pull them out. not a big deal.
now, need some cams!
by the way, did some more verification of what cams they are.. timing was set to 2.0mm on pass and 2.0mm on driver (spec is 1.8 and 2.0 respectively for S4 cams and 1.6 and 2.0 for 85-86 cams)
so, it certainly is not a GT cam as that particular spec is in the 3mm range for both.
so, based on how i was measuring, i certainly could be .2mm off. so, i think they are S4 cams with 85 lift. base circle seems to be the same, bearing widths are the same.
Now i need to find out how to modify the driver exhaust cam , as all others will bolt in after hacking off the uneeded ends.
any ideas.
GT cams will probably be the answer!
tick tock. 2 weeks for the race! well, i know i can put them together in a few hours, just need the cams!!!!!
HELP!!
MK
by the way, the lift is 10mm on the 85 cam (same as GT), vs the 9mm for the S4 cam. i have all three sets in front of me and was measuring and marking cams last night!
now, need some cams!
by the way, did some more verification of what cams they are.. timing was set to 2.0mm on pass and 2.0mm on driver (spec is 1.8 and 2.0 respectively for S4 cams and 1.6 and 2.0 for 85-86 cams)
so, it certainly is not a GT cam as that particular spec is in the 3mm range for both.
so, based on how i was measuring, i certainly could be .2mm off. so, i think they are S4 cams with 85 lift. base circle seems to be the same, bearing widths are the same.
Now i need to find out how to modify the driver exhaust cam , as all others will bolt in after hacking off the uneeded ends.
any ideas.
GT cams will probably be the answer!
tick tock. 2 weeks for the race! well, i know i can put them together in a few hours, just need the cams!!!!!
HELP!!
MK
by the way, the lift is 10mm on the 85 cam (same as GT), vs the 9mm for the S4 cam. i have all three sets in front of me and was measuring and marking cams last night!
I have cam analysis software and will plot the lift/duration of Mark's special cams for the record.
09-15-2005, 02:03 PM
#47
Rennlist Member
Thread Starter
want me to send you the intake and exhaust cam?
do you have records of the 85 and S4?
let me know.
MK
do you have records of the 85 and S4?
let me know.
MK
Originally Posted by Louie928
I have cam analysis software and will plot the lift/duration of Mark's special cams for the record.
09-15-2005, 02:36 PM
#49
Rennlist Member
Thread Starter
YES, we have got to that cross road now! hope i can modify them!!
thanks a mill for them, although right now, its like a carrot on a string.
got to get something together by month end!!!!!
2weeks!!!!!!!
MK
thanks a mill for them, although right now, its like a carrot on a string.
got to get something together by month end!!!!!
2weeks!!!!!!!
MK
Originally Posted by 928SS
iirc, you still have my 85 cams, you'd just need to tweak them and you'd be good to go... might try a local cam shop/or elgins....
09-15-2005, 02:53 PM
#50
Three Wheelin'
Originally Posted by mark kibort
want me to send you the intake and exhaust cam?
do you have records of the 85 and S4?
let me know.
MK
do you have records of the 85 and S4?
let me know.
MK
09-15-2005, 03:33 PM
#51
Rennlist Member
Thread Starter
PM me with your address again, incase i have misplaced it.
ill send out the passenger side pair
cant wait to find out what they are, really!
MK
ill send out the passenger side pair
cant wait to find out what they are, really!
MK
Originally Posted by Louie928
I have records of the GT cams. I do not have '85/'86 cams to measure. I do have S4 cams, but have not taken a profile of those. I would appreciate it if you could send your intake & exhaust cams. I'll take profiles. If I can get '85/'86 cams, I'll do those too for comparison.
09-15-2005, 03:50 PM
#52
Nordschleife Master
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Mark, why don't you send him the 85 passenger pair also. That way Louie can map them while you get the driver's side modified. I'd think a good engine shop or general machine shop could do the mods. It's only shortening and making a shoulder, right?
09-15-2005, 03:54 PM
#53
Rennlist Member
Thread Starter
Thats what im going to do. send the passenger side.
shorting (easy) , grinding off the existing one side thrust bearing surface , machine shop can do this, and then buid up a shoulder. (not so easy, especially if you dont want to expose cam to heat.)
Mk
shorting (easy) , grinding off the existing one side thrust bearing surface , machine shop can do this, and then buid up a shoulder. (not so easy, especially if you dont want to expose cam to heat.)
Mk
Originally Posted by FlyingDog
Mark, why don't you send him the 85 passenger pair also. That way Louie can map them while you get the driver's side modified. I'd think a good engine shop or general machine shop could do the mods. It's only shortening and making a shoulder, right?
09-15-2005, 08:53 PM
#55
I also have two unused 85 cams that were from a set of four where two were broken. NOt sure which ones the good ones are, but they could go in for testing or whatever
09-16-2005, 12:00 AM
#56
Three Wheelin'
Originally Posted by 928SS
ok w/me to send to my cams to louie too if it helps the cause.... would be cool to find out what's really what...
regards!
regards!
09-16-2005, 04:36 PM
#59
Rennlist Member
Thread Starter
a couple of choices .
company that has a pretty good rep for fixing with some proprietary way of attaching new sprockets stronger than the original . "parts works". Web cam recommened them. they use some real high tech way to do this. they used to do same kind of mods to large industrial paper machines using cams running 24/7. it transfered over to the auto industry easily and they are very confident they can do a repair. most have said , stay away from repairing cams used in racing applications, but these guys also have done this for 968s , in particular, PowerHouse as a customer too.
anyone heard of them?
second, most desirable, modify the 85 cams
third, most costly, but guaranteed to work, GT cams if i can find them.
(fourth, to put in stock S4 cams...............nah!!!)
Mk
company that has a pretty good rep for fixing with some proprietary way of attaching new sprockets stronger than the original . "parts works". Web cam recommened them. they use some real high tech way to do this. they used to do same kind of mods to large industrial paper machines using cams running 24/7. it transfered over to the auto industry easily and they are very confident they can do a repair. most have said , stay away from repairing cams used in racing applications, but these guys also have done this for 968s , in particular, PowerHouse as a customer too.
anyone heard of them?
second, most desirable, modify the 85 cams
third, most costly, but guaranteed to work, GT cams if i can find them.
(fourth, to put in stock S4 cams...............nah!!!)
Mk
09-16-2005, 05:47 PM
#60
Three Wheelin'
Originally Posted by mark kibort
a couple of choices .
company that has a pretty good rep for fixing with some proprietary way of attaching new sprockets stronger than the original . "parts works". Web cam recommened them. they use some real high tech way to do this. they used to do same kind of mods to large industrial paper machines using cams running 24/7. it transfered over to the auto industry easily and they are very confident they can do a repair. most have said , stay away from repairing cams used in racing applications, but these guys also have done this for 968s , in particular, PowerHouse as a customer too.
anyone heard of them?
second, most desirable, modify the 85 cams
third, most costly, but guaranteed to work, GT cams if i can find them.
(fourth, to put in stock S4 cams...............nah!!!)
Mk
company that has a pretty good rep for fixing with some proprietary way of attaching new sprockets stronger than the original . "parts works". Web cam recommened them. they use some real high tech way to do this. they used to do same kind of mods to large industrial paper machines using cams running 24/7. it transfered over to the auto industry easily and they are very confident they can do a repair. most have said , stay away from repairing cams used in racing applications, but these guys also have done this for 968s , in particular, PowerHouse as a customer too.
anyone heard of them?
second, most desirable, modify the 85 cams
third, most costly, but guaranteed to work, GT cams if i can find them.
(fourth, to put in stock S4 cams...............nah!!!)
Mk