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Bill Verburg's Avatar
 
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What cams did you use in the 3.6RS? Do you have a favorite or a recommendation for the 3.6 motor?
I have the same 993RS hyd. cams in both engines. In the 3.6 it is just a little peakier and has a little lumpier idle and you need to shift more not a big deal.

there are always other cams I would like to try. The best I have experienced in a street car is in a buddys 964 t/p it is a 993 SS w/ mechanical lifters. Again he has a regeared 915 so the ratios are nice and close.
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Bill Verburg
'76 Carrera 3.6RS(nee C3/hotrod), '95 993RS/CS(clone)
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Old 08-28-2005, 04:09 PM
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Are factory 3.8 liter RSR cylinder heads (see photo) compatible with the 3.8RS piston/cyinder set and if so how do they differ from the factory RS heads?
I believe so, I really do not know. my best WAG is that the ports and valves are inconsistant w/ street use. I discussed my plans w/ Joel Reiser before the fact. He had a couple of 993RSR engines sitting not far from me but convinced me that they were not the way to go for a dual purpose street/DE motor.
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Old 08-28-2005, 04:13 PM
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Bill,

I had a chat with 9mracing in the UK and they were suggesting that the most effective way for me to produce 'more' power on a 3.8 upgrade is to procure and port some 964 heads with a custom cam rather than using a 993RS head/cam?

Any thoughts?

Thx

Martin Gibson
83 911SC 3.6
Old 11-05-2005, 01:02 AM
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The only advantage I see for 964 heads is the wide array of relatively cheap valves available, you can get 52mm and even larger in SS or Ti, undercut or plain etc. for much less than the cost of the 993RS valves.

My instinct would be to go w/ a builder I trust and let him make the decision, I would want to know why though.

9M has a good rep
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Old 11-05-2005, 04:24 AM
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9m were suggesting that the 993 heads are 'over-valved' and with the appropriate cam/gas flowing the 964 heads consistently outperform the 993 heads?

I will be taking my car into 9m over the next few weeks so will dig a little deeper.

Thx

Martin Gibson
83 911SC 3.6
Old 11-05-2005, 04:45 AM
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I guess that depends on a lot of other things like cams, gearing and usage.

A few other minor points

*The 993 and 930 heads are also made of the more heat resistant RR350 alloy. A minor point

*the removable rocker pedestals on the 993 are somewhat easier to deal with and don't leak like the earlier ones can
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'76 Carrera 3.6RS(nee C3/hotrod), '95 993RS/CS(clone)
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Old 11-05-2005, 05:41 AM
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