[insite94]

http://speedzekeracing.com/catalog/product...products_id/834



I'm sure someone with a bunch more knowledge than me (not difficult to achieve <img src="/forum/images/smilies/968/wink.gif" class="smilie" alt="" /> ) has comments on this?



Through constant repetition, I understand the 968 motors are difficult to extract much addition power from, with a chip being about the only source of bang for the buck.



Anybody know this camshaft or have any idea if there are significant performance gains?



Flash, chime in here...you are in your element! <img src="/forum/images/smilies/968/biggrin.gif" class="smilie" alt="" />



Thanks for any and all comments (as long as they are constructive or humorous)

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[Anchorman]

I think one of the site sponsors, RSBarn, offers performance camshafts. So, there's at least one (commercial) view.

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[RS Barn]

    I am offering performance camshafts soon. We actually tested out a set of our own design and weren't happy with the results and therefore back to the drawing board. My goal was to offer a performance option that could be added when you replaced cams due to wear etc.

Michael Mount who has been developing 16 valve motors for ten years has used a grind for S-2's very successfully. We tried this grind on a 968 cam and were disappointed. We had a gain in top end and a fair loss in midrange. Not what were looking for. The variocam has a definite effect on cam timing. It advances the intake cam 10 degrees at 4200rpm or so. We are working on a few new models to test. BTW we are not working with web- cam

1. Yes the 968 motor is proving difficult to extract more usable power

2. The Web cam add is misleading. They do not have a 968 performance cam

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[Jason Judd]

We used a Webcam in our turbo conversion.



Jason

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[insite94]

[quote name='Jason Judd' date='May 18 2005, 07:52 AM']We used a Webcam in our turbo conversion.



Jason

[right][post="4859"]<{POST_SNAPBACK}>[/post][/right][/quote]



Jason - Is the grind any different than a stock cam? If so, and in your opinion, is there noticable (seat of the pants or dyno) change in torque for better or worse?



Finally, if there is positive benefit to performance, can it be traced to the cam? Or is the cam simply part of the "total performance package", and thus not so useful as a single engine mod?



Sorry for my inquisitiveness <img src="/forum/images/smilies/968/blink.gif" class="smilie" alt="" /> , but I'm really curious and hope others are too.

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[Jason Judd]

Yes, the grind is different than stock...



We did quite a bit, as you may have guessed, to the motor at the same time so it's hard to say what the cam alone may have contributed to the entire package.



My mechanic followed Porsche's guide for the Turbo RS specs and we're pretty happy with the results.



Jason

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[mikeo]

One other source for 968 cams is Jon Milledge Engineering. Not all of his cams are listed on the website so don't be put off if you are serious about a performance cam for your 968. Here are his responses to inquires I made in 2003:



"Yes, I have a hydraulic grind pair (I & E) that works well for either NA or boosted (ground at different LSAs). My 944 2V cams are chilled iron castings, just like stock cams. Chilled iron isn't heat treated, it's already very hard. Steel cams are not compatible with the stock lifter material and will cause failure. All 4V cams are ground on the customers core and are not new cams like our 2v camshafts. The S1 4V cam grind is $850 ground on the customers core.



"These cams are what I call Stage 1 or about 8 degrees longer than stock both on intake and on exhaust. I have used them to make 255 bhp on a built S2 engine and 268 bhp on a built 968 engine. No material is added and the lifters are within their stock adjustment value. Yes, $850 for the pair, ground on your cores.



"Lobe Separation Angle (LSA) the angle between the intake and exhaust lobe centers - what the variocam adjusts. Wider on Turbo cams for less overlap than on NA cams. I used these cams to make 604 bhp with a 2.5L 4V engine at 1.4 bar boost. With wilder cams, we could have made this bhp with less boost."



The horsepower numbers Jon quotes are engine dyno numbers.

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[mikeo]

One other source for 968 cams is Jon Milledge Engineering. Not all of his cams are listed on the website so don't be put off if you are serious about a performance cam for your 968. Here are his responses to inquires I made in 2003:



"Yes, I have a hydraulic grind pair (I & E) that works well for either NA or boosted (ground at different LSAs). My 944 2V cams are chilled iron castings, just like stock cams. Chilled iron isn't heat treated, it's already very hard. Steel cams are not compatible with the stock lifter material and will cause failure. All 4V cams are ground on the customers core and are not new cams like our 2v camshafts. The S1 4V cam grind is $850 ground on the customers core.



"These cams are what I call Stage 1 or about 8 degrees longer than stock both on intake and on exhaust. I have used them to make 255 bhp on a built S2 engine and 268 bhp on a built 968 engine. No material is added and the lifters are within their stock adjustment value. Yes, $850 for the pair, ground on your cores.



"Lobe Separation Angle (LSA) the angle between the intake and exhaust lobe centers - what the variocam adjusts. Wider on Turbo cams for less overlap than on NA cams. I used these cams to make 604 bhp with a 2.5L 4V engine at 1.4 bar boost. With wilder cams, we could have made this bhp with less boost."



The horsepower numbers Jon quotes are engine dyno numbers.

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[RS Barn]

What we saw with similar changes added top end HP with a unaccepable drop in mid- range torque. This combined with other mods could make a good race motor but not a good street setup. That's why we're trying new combinations. Those Porsche guys are pretty smart!

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[insite94]

Mikeo and Jason - thanks for the input. Changing the cam doesn't sound like anything I should be interested in for my bone-stock motor. A different cam would be helpful in a race setup, but mines a daily driver.



RS - Gimme torque, lotsa torque, lotsa fat and juicy torque! HP is good too <img src="/forum/images/smilies/968/smile.gif" class="smilie" alt="" /> I'll be curious to see how your tweeking works out. Thanks for your input too.

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[Anchorman]

Insite - don't worry about swapping cams. Just swap engines for a Corvette V8 and you'll have "...torque, lotsa torque, lotsa fat and juicy torque".

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[Jason Judd]

Anchor wrote:



Just swap engines for a Corvette V8 and you'll have "...torque, lotsa torque, lotsa fat and juicy torque...

_____________________



And it'll probably less expensive than my turbo conversion, too!



Jason

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[insite94]

[quote name='Jason Judd' date='May 20 2005, 04:36 AM']Anchor wrote:



Just swap engines for a Corvette V8 and you'll have "...torque, lotsa torque, lotsa fat and juicy torque...

_____________________



And it'll probably less expensive than my turbo conversion, too!



Jason

[right][post="4916"]<{POST_SNAPBACK}>[/post][/right][/quote]



Anchor and Jason - Don't think I haven't thought about that! With 175K miles on the odo, I figure 2-3 years before decision time. A nice LS1 installation from say Renegade hybrids will still run around $15K <img src="/forum/images/smilies/968/blink.gif" class="smilie" alt="" /> ...not as economical as I thought., but oooooh, that torque. <img src="/forum/images/smilies/968/biggrin.gif" class="smilie" alt="" />



The more I explore, the more I understand that Porsche did a great job extracting almost every bit of power from these motors while keeping them reliable (relatively). <img src="/forum/images/smilies/968/smile.gif" class="smilie" alt="" />

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[rustech]

Do it yourself, and it'll cost much less. Sell your motor to offset some of the cost also (along with DME...)

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