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Kenodog
Joined: 25 Jun 2003
Posts: 2669
Location: Vancouver,B.C.
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 Posted: Tue Jan 06, 2015 7:29 am Post subject: Two technical questions. |
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1) does anyone know off hand if you are supposed to use factory torque figures for the head bolts when using a Cometic head gasket ?
2) I have a brand new cam ground to the Integral Stage 2 profile. Do I start at 0 deg. on a vernier cam gear or put some adv/ret into it ?
Thanks guys,
Leigh
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1981 931, Sabine
1991 Ford Ranger XLT 4x4, Ricky
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Carrera RSR
Joined: 08 Jan 2010
Posts: 2312
Location: Somerset, UK
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| Posted: Tue Jan 06, 2015 7:59 am Post subject: |
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1. I too would like to hear some answer to this including ARP v's stock bolts. Have you asked Cometic? Is it thickness specific? Does ARP torque spec override all?
2. I played with advance/retard with my Piper cam. Whilst retarding helped with top end revs it made the car more laggy. I prefered the earlier boost and torque of an advanced cam. However it can be engine specific and dyno runs with changes may gives better understanding of results. But also consider the butt dyno too, how it drives everyday
Neither will give you more power but it can lose you power if you go too far either way. It just moves the sweet spot up and down the rev range.
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1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
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MikeDanger
Joined: 21 Nov 2002
Posts: 774
Location: Denver
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| Posted: Tue Jan 06, 2015 8:20 am Post subject: |
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| Carrera RSR wrote: | 1. I too would like to hear some answer to this including ARP v's stock bolts. Have you asked Cometic? Is it thickness specific? Does ARP torque spec override all?
2. I played with advance/retard with my Piper cam. Whilst retarding helped with top end revs it made the car more laggy. I prefered the earlier boost and torque of an advanced cam. However it can be engine specific and dyno runs with changes may gives better understanding of results. But also consider the butt dyno too, how it drives everyday
Neither will give you more power but it can lose you power if you go too far either way. It just moves the sweet spot up and down the rev range. |
How do you think that would have worked if you had used a Franco cam gear?
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Carrera RSR
Joined: 08 Jan 2010
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Location: Somerset, UK
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| Posted: Tue Jan 06, 2015 8:45 am Post subject: |
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I don't know, what do you think?
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1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
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MikeDanger
Joined: 21 Nov 2002
Posts: 774
Location: Denver
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| Posted: Tue Jan 06, 2015 8:51 am Post subject: |
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well thats what im wondering, I haven't see an reports of the Franco AND a performance cam. (which is what I intend to do.)
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fiat22turbo
Joined: 18 Jan 2006
Posts: 4040
Location: Portland, OR
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| Posted: Tue Jan 06, 2015 9:14 am Post subject: |
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| MikeDanger wrote: | | well thats what im wondering, I haven't see an reports of the Franco AND a performance cam. (which is what I intend to do.) |
I noticed a difference in the torque curve in my lil NA ITB project using the Franco cam and the Integral cam with base timing retarded 3 degrees and moving to +7 after around 3500rpm.
Never got it tuned well enough or had enough time to get it on a dyno to get actual data, maybe the stars will align this spring/summer and I can make that happen.
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Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose) |
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11733
Location: PacNW
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| Posted: Tue Jan 06, 2015 11:09 am Post subject: |
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My Integral cam had a spec sheet with the info you're asking about. New company doesn't include it?
As to torque specs, THIS PAGE seems to indicate that appropriate values are dependent on the fastener, so I would use factory values.
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Last edited by Rasta Monsta on Tue Jan 06, 2015 11:12 am; edited 1 time in total |
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MikeDanger
Joined: 21 Nov 2002
Posts: 774
Location: Denver
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| Posted: Tue Jan 06, 2015 11:10 am Post subject: |
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anything for a little more low end grunt.
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fiat22turbo
Joined: 18 Jan 2006
Posts: 4040
Location: Portland, OR
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| Posted: Tue Jan 06, 2015 11:22 am Post subject: |
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| MikeDanger wrote: | | anything for a little more low end grunt. |
Yeah, with it I actually HAD some torque. So yeah, I'd say it would help expand the area under the curve on a dyno plot.
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Stefan
1979 924 Carrera GTS (clone-ish)
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