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Adjustable cam gear?

 
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924-76  



Joined: 05 Jun 2006
Posts: 1412
Location: Ontario, Canada

PostPosted: Tue May 20, 2008 2:10 am    Post subject: Adjustable cam gear? Reply with quote

Anyone try an adjustable cam gear with the stock camshaft?
Is it worth it?
What’s the result?
Would you recommend it?

Thanks
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Rich H  



Joined: 10 Jun 2007
Posts: 2665
Location: Preston, Lancs, UK

PostPosted: Tue May 20, 2008 3:16 am    Post subject: Reply with quote

Pointless with standard engine bits, what would you adjust for? If you have a manufacturing problem you could tune that out perhaps, but its alot of work for no result.

IMHO of course!

Rich
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Scorpio  



Joined: 05 Jul 2007
Posts: 1957
Location: Brisbane, Australia

PostPosted: Tue May 20, 2008 7:40 pm    Post subject: Reply with quote

would it be beneficial on a BAE turbo install? looking for some serious acceleration as opposed to top end speed...p.s sorry to hijack
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Rich H  



Joined: 10 Jun 2007
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PostPosted: Tue May 20, 2008 9:00 pm    Post subject: Reply with quote

Again I doubt it. You may get a little bit more torque or top end, but I doubt you will notice! If it was a Twink you could play with overlap and so on, but as a SOHC you are stuck with the profile you have.
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!tom  



Joined: 28 Aug 2006
Posts: 1901
Location: Victoria, BC Canada

PostPosted: Wed May 21, 2008 2:28 am    Post subject: Reply with quote

The motivation for an adjustable cam gear is often to set the cam timing back to the stock value after machining the head or block (as appropriate) to increase compression. A light skim of either surface to get it back to true is not going to make much of a difference to the timing.
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Raceboy  



Joined: 01 Mar 2004
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Location: Estonia, Europe

PostPosted: Wed May 21, 2008 5:07 am    Post subject: Reply with quote

My suggestion: if cam tuning is required, use adjustable cam pulley, tune it and then have new groove machined to stock pulley in the correct location.
It's not good to have another potential failure place (bolts on the pulley).
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924-76  



Joined: 05 Jun 2006
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Location: Ontario, Canada

PostPosted: Wed May 21, 2008 11:04 pm    Post subject: Reply with quote

From what I read, adjustable cam gear is design to move the power band to get more low end or top end. Since the 924 power band with the 4 speed tranny is low, I was hoping to move it up a little bit to hopefully get better performance.
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Rich H  



Joined: 10 Jun 2007
Posts: 2665
Location: Preston, Lancs, UK

PostPosted: Thu May 22, 2008 12:30 am    Post subject: Reply with quote

Maybe, but your cash would be better spent elsewhere... Like a 5 speed box perhaps!

Adjustable cam gear and Franco cam gear are different beasts entirely.... Adjustable cam gear is traditionally for correctly timing wild cams. If its possible to alter power bands I would be very interested but I don't think it will work...
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bass gt  



Joined: 02 Dec 2004
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Location: Johannesburg for now!!

PostPosted: Thu May 22, 2008 3:41 am    Post subject: Reply with quote

Rich H wrote:
If its possible to alter power bands I would be very interested but I don't think it will work...

Rich,

In my experience with my hotter cam, the Piper vernier cam wheel was good in dialling in the ideal cam timing. by swinging the vernier 3degress either side of 0, there was a noticable change in the power characteristic. However, where the bottom end power increased, there was a drop in top end power, and vice versa. Whether this can be replicated on a stock cam i don't know, but as an aside, every car in theUK 924 championship runs a Piper cam wheel. Take from that what you will. And raceboy's comment about the risk of the wheel failing/shifting out of true is a non event on the Piper wheel.

Steve
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Rich H  



Joined: 10 Jun 2007
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Location: Preston, Lancs, UK

PostPosted: Thu May 22, 2008 6:38 am    Post subject: Reply with quote

Cool.

I'll have a play then I bought one for my planned engine upgrade and fitted it as it was shiney. I'll have a play when I get a chance. Its a piper one so only +/- 3 degrees unless all the screws fall out...
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Scorpio  



Joined: 05 Jul 2007
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PostPosted: Thu May 22, 2008 10:06 am    Post subject: Reply with quote

keep us informed rich H !
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1979 NA
MS1..EFI..
GARRETT T25 TURBO
BILSTEIN SHOCKS
GT BASED CUSTOM BODYKIT

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Think mean think fast
all youll see is
my Porsches Arse!!!
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Rich H  



Joined: 10 Jun 2007
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Location: Preston, Lancs, UK

PostPosted: Thu May 22, 2008 5:22 pm    Post subject: Reply with quote

I'm on hols for 2 weeks as of Tues, and I haev a bit of a bodywork issue at the moment.... Bugger....
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Scorpio  



Joined: 05 Jul 2007
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PostPosted: Thu Sep 18, 2008 1:44 pm    Post subject: Reply with quote

rich..any progress on the cam gear?
_________________
1979 NA
MS1..EFI..
GARRETT T25 TURBO
BILSTEIN SHOCKS
GT BASED CUSTOM BODYKIT

Brisbane , Australia
Think mean think fast
all youll see is
my Porsches Arse!!!
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Rich H  



Joined: 10 Jun 2007
Posts: 2665
Location: Preston, Lancs, UK

PostPosted: Thu Sep 18, 2008 5:12 pm    Post subject: Reply with quote

Nope, its fitted but I have't played with it yet. Been busy with everything else!

I'll try and remember and have a go next week.
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1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec
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