Cam change - what's the story
12-10-2009, 11:47 AM
#1
Racer
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Cam change - what's the story
Just wondering what everyone's experience is with changing the cam on a 951.
What kind of power gains ? Better on a modded motor than stock ?
What about using a N/A cam in a 951 ?
I have a kokeln stage V turbo (61#) , MAF, full exhaust, lindsey head, etc,etc, and I'm just wondering if a cam would make a difference ?
Thanks!
Tom
What kind of power gains ? Better on a modded motor than stock ?
What about using a N/A cam in a 951 ?
I have a kokeln stage V turbo (61#) , MAF, full exhaust, lindsey head, etc,etc, and I'm just wondering if a cam would make a difference ?
Thanks!
Tom
12-10-2009, 01:39 PM
#2
Rennlist Member
The best advice that I have seen on Rennlist and other boards is this:
"Any cam, except the 944 NA, is better than the stock 951 cam."
Granted, I can't speak from personal experience, but the above comment seems to be the universal opinion.
"Any cam, except the 944 NA, is better than the stock 951 cam."
Granted, I can't speak from personal experience, but the above comment seems to be the universal opinion.
12-10-2009, 06:32 PM
#3
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gee who said that? . as i was absolutely stoked with the results from the NA cam the car seemed to be heaps stronger while spooling up .
there has been plenty of accounts saying "hardly any difference"
but at a couple of hundred $ its easier to justify than 500 or more that other cams will cost .
and how is it you call it good advice if you have no accounts NA cams being junk ...?
when you look at the numbers the NA cam goes 2 thirds the way to the WEB cam from the turbo i can't see how you could go wrong ....
Oh i did have one account from a guy that raced a car that have to have a standard turbo and exhaust but ran Motec and he said there was a bit of a loss in midrange when fitting the web cam
every one that has a stage 1 or bigger huffer and 3" or bigger exhaust say the web cam is ok
once you bigger then the web 274 it starts to get a bit scientific and you have send about 50 emails to Chris white
there has been plenty of accounts saying "hardly any difference"
but at a couple of hundred $ its easier to justify than 500 or more that other cams will cost .
and how is it you call it good advice if you have no accounts NA cams being junk ...?
when you look at the numbers the NA cam goes 2 thirds the way to the WEB cam from the turbo i can't see how you could go wrong ....
Oh i did have one account from a guy that raced a car that have to have a standard turbo and exhaust but ran Motec and he said there was a bit of a loss in midrange when fitting the web cam
every one that has a stage 1 or bigger huffer and 3" or bigger exhaust say the web cam is ok
once you bigger then the web 274 it starts to get a bit scientific and you have send about 50 emails to Chris white
12-10-2009, 06:52 PM
#4
gee who said that? . as i was absolutely stoked with the results from the NA cam the car seemed to be heaps stronger while spooling up .
there has been plenty of accounts saying "hardly any difference"
but at a couple of hundred $ its easier to justify than 500 or more that other cams will cost .
and how is it you call it good advice if you have no accounts NA cams being junk ...?
when you look at the numbers the NA cam goes 2 thirds the way to the WEB cam from the turbo i can't see how you could go wrong ....
Oh i did have one account from a guy that raced a car that have to have a standard turbo and exhaust but ran Motec and he said there was a bit of a loss in midrange when fitting the web cam
every one that has a stage 1 or bigger huffer and 3" or bigger exhaust say the web cam is ok
once you bigger then the web 274 it starts to get a bit scientific and you have send about 50 emails to Chris white
there has been plenty of accounts saying "hardly any difference"
but at a couple of hundred $ its easier to justify than 500 or more that other cams will cost .
and how is it you call it good advice if you have no accounts NA cams being junk ...?
when you look at the numbers the NA cam goes 2 thirds the way to the WEB cam from the turbo i can't see how you could go wrong ....
Oh i did have one account from a guy that raced a car that have to have a standard turbo and exhaust but ran Motec and he said there was a bit of a loss in midrange when fitting the web cam
every one that has a stage 1 or bigger huffer and 3" or bigger exhaust say the web cam is ok
once you bigger then the web 274 it starts to get a bit scientific and you have send about 50 emails to Chris white
Im sure someone with more experiecen will chime in.
12-10-2009, 08:58 PM
#5
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people around here have little enthusiasm for cams as they don't yield the impressive results one gets from cam and lifter package on a SBC Also they don't stack up well per $ against a MAF an exhaust or second hand K27 etc all at similar cost
the good thing about the 8v engine is its not a "lets do it while its apart " you can always come back and do it as it sits on top there..
So although I'm impressed with my NA cam i would advise like many here do almost every thing else first.
the good thing about the 8v engine is its not a "lets do it while its apart " you can always come back and do it as it sits on top there..
So although I'm impressed with my NA cam i would advise like many here do almost every thing else first.
12-10-2009, 09:24 PM
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No dyno results . but have the Web cam with 4" exhaust , maf , k26/8 cheater.
did the cam change after everything else had been done for some time and had a good tune. End result was a little loss on low end but feels much stronger from there up.
For the cost of the cam it would not be early on my list of changes and as earlier mentioned it can be done easily at any time.
my 2 cents worth.
Clifton
did the cam change after everything else had been done for some time and had a good tune. End result was a little loss on low end but feels much stronger from there up.
For the cost of the cam it would not be early on my list of changes and as earlier mentioned it can be done easily at any time.
my 2 cents worth.
Clifton
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12-10-2009, 09:44 PM
#8
No dyno results . but have the Web cam with 4" exhaust , maf , k26/8 cheater.
did the cam change after everything else had been done for some time and had a good tune. End result was a little loss on low end but feels much stronger from there up.
For the cost of the cam it would not be early on my list of changes and as earlier mentioned it can be done easily at any time.
my 2 cents worth.
Clifton
did the cam change after everything else had been done for some time and had a good tune. End result was a little loss on low end but feels much stronger from there up.
For the cost of the cam it would not be early on my list of changes and as earlier mentioned it can be done easily at any time.
my 2 cents worth.
Clifton
12-11-2009, 02:41 AM
#9
What about using a N/A cam in a 951 ?
it was taken from pre 1985½ N/A. Part numbers last three digits are 05R while late model N/A cam digits are 09R. Late model N/A cam have 1mm more lift on exhaust side. Also slight difference on duration values.
12-11-2009, 06:52 PM
#11
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944 N/A cam has 3 degrees more duration. When rebuilding my 951 track car, and on a limited budget, I put in a used late model N/A cam for $40 instead of spending $500 on a Web cam. I have been very happy with the results. The tubo seems to stay spooled much better.
12-12-2009, 12:28 AM
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12-12-2009, 12:42 PM
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