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Andrew
rice boy
Joined: 12 Dec 2001
Posts: 22
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 Posted: Wed Jan 09, 2002 5:28 pm Post subject: Cams n diffs |
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Just got a dyno done on my 2L G180 today:
39kw/52hp rear wheels @ 4930rpm
158Nm (the diff's buggered though)
It's got tons of torque to spare and the compression's through the roof (175psi - what ratio is this?) so i'll definately try to get a bigger cam, but would it be worth fitting a taller diff too?
What price should i be looking at for a cam?
What about a diff? |
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TXcoupe
petrol head
Joined: 05 Oct 2001
Posts: 1675
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| Posted: Wed Jan 09, 2002 10:23 pm Post subject: Re: Cams n diffs |
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| your joking right? that is shit hp. No stay wif the same ratio and use a 2000 to 6000 cam and that will free up more hp. price for the cam is about 200 |
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LOK15
tinkerer
Joined: 11 Dec 2001
Posts: 418
Location: BrIsBaNe Or IpSwIcH
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| Posted: Wed Jan 09, 2002 11:59 pm Post subject: Re: Cams n diffs |
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U can pick up a regrind cheaper but billet is always better
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Benjamin
backyard mechanic
Joined: 05 Oct 2001
Posts: 525
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| Posted: Thu Jan 10, 2002 1:25 pm Post subject: Re: Cams n diffs |
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Something is holding that engine back seriously. I used to get 45Kw rear wheels @ 5500rpm from a near std G161. This jumped to nearly 60Kw after 32/36 Weber and extractors.
I think torque was up around 175Nm.
If the diff is *really* buggered then that may be sapping some power, I wouldn't think that much though. |
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MatMan
tinkerer
Joined: 04 Oct 2001
Posts: 280
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| Posted: Thu Jan 10, 2002 3:11 pm Post subject: Re: Cams n diffs |
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| A cheap regrind probably won't last too long. |
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Adam
Site Admin
Joined: 04 Oct 2001
Posts: 682
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| Posted: Fri Jan 11, 2002 2:15 am Post subject: Re: Cams n diffs |
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A mild regrind just reduces the size of the base circle, so running with factory valve springs then the increase in load is only on the original lobe (with any surface hardening that holden may/may not do) and only proportional to the increase in lift...
I wouldn't recommend an extreme regrind running mega-stiff springs, but even then you could be lucky and have no problems. |
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SikGem
tinkerer
Joined: 18 Nov 2001
Posts: 373
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| Posted: Sun Jan 13, 2002 11:51 pm Post subject: Re: Cams n diffs |
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Yeah, 52hp is pretty bad. There has to be something wrong somewhere. I got 110hp from my engine and I thought that was really pathetic. I don't feel so bad now  |
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SikGem
tinkerer
Joined: 18 Nov 2001
Posts: 373
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| Posted: Mon Jan 14, 2002 12:37 am Post subject: Re: Cams n diffs |
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I'm sorry Andrew for my last post. It sounded worse than it was meant to. Its just that I have spent $$$ on my motor and was fairly disappointed with the hp reading. Other people seem to do bugger-all, yet come close in hp  |
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